�??xml version="1.0" encoding="utf-8" standalone="yes"?><rss version="2.0" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:trackback="http://madskills.com/public/xml/rss/module/trackback/" xmlns:wfw="http://wellformedweb.org/CommentAPI/" xmlns:slash="http://purl.org/rss/1.0/modules/slash/"><channel><title>&#x61;&#x76;&#x4E2D;&#x6587;&#x5B57;&#x5E55;&#x4E00;&#x533A;&#x4E8C;&#x533A;&#x4E09;&#x533A;&#x2C;&#x6B27;&#x7F8E;&#x4E9A;&#x6D32;&#x53E6;&#x7C7B;&#x4E45;&#x4E45;&#x7EFC;&#x5408;&#x2C;&#x65E5;&#x97E9;&#x4E00;&#x533A;&#x4E8C;&#x533A;&#x4E45;&#x4E45;&#x4E45;</title><link>http://www.aygfsteel.com/soft/</link><description>&lt;center&gt;&lt;font color="black" size="3"&gt;专注于效�? 专注于�h(hu��n)�?lt;/font&gt;&lt;br&gt;&amp;nbsp;&lt;br&gt;  
&lt;font size="5"&gt;&lt;b&gt;书法.JAVA BLOG&lt;/b&gt;&lt;/font&gt;&lt;/center&gt;</description><language>zh-cn</language><lastBuildDate>Sat, 17 May 2025 08:24:59 GMT</lastBuildDate><pubDate>Sat, 17 May 2025 08:24:59 GMT</pubDate><ttl>60</ttl><item><title>Tomcat5.5数据库连接池的配�|?/title><link>http://www.aygfsteel.com/soft/archive/2006/11/28/83948.html</link><dc:creator>书法</dc:creator><author>书法</author><pubDate>Mon, 27 Nov 2006 19:25:00 GMT</pubDate><guid>http://www.aygfsteel.com/soft/archive/2006/11/28/83948.html</guid><wfw:comment>http://www.aygfsteel.com/soft/comments/83948.html</wfw:comment><comments>http://www.aygfsteel.com/soft/archive/2006/11/28/83948.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.aygfsteel.com/soft/comments/commentRss/83948.html</wfw:commentRss><trackback:ping>http://www.aygfsteel.com/soft/services/trackbacks/83948.html</trackback:ping><description><![CDATA[刚把5.0的配�|�搞定，换了(ji��n)5.5版本��׃��一样了(ji��n)�Q�试�?ji��n)半天结�?.0的配�|�经验，�l�于搞定�?ji��n)，�q�算有成���感^_^�?

�W�一步：(x��)把数据库驱动拯���到Tomcat安装目录�?common/lib下和你自��q��站的/WEB-INF/lib下（我用的mysql�Q�其他一��P��(j��)�Q?
�W�二步：(x��)以admin�w�䆾�q�入Tomcat���理界面配置用户名、密码、连接数�?..
　　之后生成的Server.xml文�g如下�Q�如果不想配�|�，你也可以直接修改后��用）(j��)


    
<!-- Example Server Configuration File -->
<!-- Note that component elements are nested corresponding to their
     parent-child relationships with each other -->

<!-- A "Server" is a singleton element that represents the entire JVM,
     which may contain one or more "Service" instances.  The Server
     listens for a shutdown command on the indicated port.

     Note:  A "Server" is not itself a "Container", so you may not
     define subcomponents such as "Valves" or "Loggers" at this level.
 -->

<Server port="8005" shutdown="SHUTDOWN">

  <!-- Comment these entries out to disable JMX MBeans support used for the 
       administration web application -->
  <Listener className="org.apache.catalina.mbeans.ServerLifecycleListener" />
  <Listener className="org.apache.catalina.mbeans.GlobalResourcesLifecycleListener" />
  <Listener className="org.apache.catalina.storeconfig.StoreConfigLifecycleListener"/>

  <!-- Global JNDI resources -->
  <GlobalNamingResources>

    <!-- Test entry for demonstration purposes -->
    <Environment name="simpleValue" type="java.lang.Integer" value="30"/>

    <!-- Editable user database that can also be used by
         UserDatabaseRealm to authenticate users -->
   
<Resource
      name="jdbc/mysql"
      type="javax.sql.DataSource"
      password="********"
      driverClassName="org.gjt.mm.mysql.Driver"
      maxIdle="2"
      maxWait="1000"
      username="root"
      url="jdbc:mysql://127.0.0.1/test"
      maxActive="4"/>
  </GlobalNamingResources>

  <!-- A "Service" is a collection of one or more "Connectors" that share
       a single "Container" (and therefore the web applications visible
       within that Container).  Normally, that Container is an "Engine",
       but this is not required.

       Note:  A "Service" is not itself a "Container", so you may not
       define subcomponents such as "Valves" or "Loggers" at this level.
   -->

  <!-- Define the Tomcat Stand-Alone Service -->
  <Service name="Catalina">

    <!-- A "Connector" represents an endpoint by which requests are received
         and responses are returned.  Each Connector passes requests on to the
         associated "Container" (normally an Engine) for processing.

         By default, a non-SSL HTTP/1.1 Connector is established on port 8080.
         You can also enable an SSL HTTP/1.1 Connector on port 8443 by
         following the instructions below and uncommenting the second Connector
         entry.  SSL support requires the following steps (see the SSL Config
         HOWTO in the Tomcat 5 documentation bundle for more detailed
         instructions):
         * If your JDK version 1.3 or prior, download and install JSSE 1.0.2 or
           later, and put the JAR files into "$JAVA_HOME/jre/lib/ext".
         * Execute:
             %JAVA_HOME%\bin\keytool -genkey -alias tomcat -keyalg RSA (Windows)
             $JAVA_HOME/bin/keytool -genkey -alias tomcat -keyalg RSA  (Unix)
           with a password value of "changeit" for both the certificate and
           the keystore itself.

         By default, DNS lookups are enabled when a web application calls
         request.getRemoteHost().  This can have an adverse impact on
         performance, so you can disable it by setting the
         "enableLookups" attribute to "false".  When DNS lookups are disabled,
         request.getRemoteHost() will return the String version of the
         IP address of the remote client.
    -->

    <!-- Define a non-SSL HTTP/1.1 Connector on port 8080 -->
    <Connector port="8080" maxHttpHeaderSize="8192"
               maxThreads="150" minSpareThreads="25" maxSpareThreads="75"
               enableLookups="false" redirectPort="8443" acceptCount="100"
               connectionTimeout="20000" disableUploadTimeout="true" />
    <!-- Note : To disable connection timeouts, set connectionTimeout value
     to 0 -->
	
	<!-- Note : To use gzip compression you could set the following properties :
	
			   compression="on" 
			   compressionMinSize="2048" 
			   noCompressionUserAgents="gozilla, traviata" 
			   compressableMimeType="text/html,text/xml"
	-->

    <!-- Define a SSL HTTP/1.1 Connector on port 8443 -->
    <!--
    <Connector port="8443" maxHttpHeaderSize="8192"
               maxThreads="150" minSpareThreads="25" maxSpareThreads="75"
               enableLookups="false" disableUploadTimeout="true"
               acceptCount="100" scheme="https" secure="true"
               clientAuth="false" sslProtocol="TLS" />
    -->

    <!-- Define an AJP 1.3 Connector on port 8009 -->
    <Connector port="8009" 
               enableLookups="false" redirectPort="8443" protocol="AJP/1.3" />

    <!-- Define a Proxied HTTP/1.1 Connector on port 8082 -->
    <!-- See proxy documentation for more information about using this. -->
    <!--
    <Connector port="8082" 
               maxThreads="150" minSpareThreads="25" maxSpareThreads="75"
               enableLookups="false" acceptCount="100" connectionTimeout="20000"
               proxyPort="80" disableUploadTimeout="true" />
    -->

    <!-- An Engine represents the entry point (within Catalina) that processes
         every request.  The Engine implementation for Tomcat stand alone
         analyzes the HTTP headers included with the request, and passes them
         on to the appropriate Host (virtual host). -->

    <!-- You should set jvmRoute to support load-balancing via AJP ie :
    <Engine name="Standalone" defaultHost="localhost" jvmRoute="jvm1">         
    --> 
         
    <!-- Define the top level container in our container hierarchy -->
    <Engine name="Catalina" defaultHost="localhost">

      <!-- The request dumper valve dumps useful debugging information about
           the request headers and cookies that were received, and the response
           headers and cookies that were sent, for all requests received by
           this instance of Tomcat.  If you care only about requests to a
           particular virtual host, or a particular application, nest this
           element inside the corresponding <Host> or <Context> entry instead.

           For a similar mechanism that is portable to all Servlet 2.4
           containers, check out the "RequestDumperFilter" Filter in the
           example application (the source for this filter may be found in
           "$CATALINA_HOME/webapps/examples/WEB-INF/classes/filters").

           Request dumping is disabled by default.  Uncomment the following
           element to enable it. -->
      <!--
      <Valve className="org.apache.catalina.valves.RequestDumperValve"/>
      -->

      <!-- Because this Realm is here, an instance will be shared globally -->

      <!-- This Realm uses the UserDatabase configured in the global JNDI
           resources under the key "UserDatabase".  Any edits
           that are performed against this UserDatabase are immediately
           available for use by the Realm.  -->
      <Realm className="org.apache.catalina.realm.UserDatabaseRealm"
             resourceName="UserDatabase"/>

      <!-- Comment out the old realm but leave here for now in case we
           need to go back quickly -->
      <!--
      <Realm className="org.apache.catalina.realm.MemoryRealm" />
      -->

      <!-- Replace the above Realm with one of the following to get a Realm
           stored in a database and accessed via JDBC -->

      <!--
      <Realm  className="org.apache.catalina.realm.JDBCRealm"
             driverName="org.gjt.mm.mysql.Driver"
          connectionURL="jdbc:mysql://localhost/authority"
         connectionName="test" connectionPassword="test"
              userTable="users" userNameCol="user_name" userCredCol="user_pass"
          userRoleTable="user_roles" roleNameCol="role_name" />
      -->

      <!--
      <Realm  className="org.apache.catalina.realm.JDBCRealm"
             driverName="oracle.jdbc.driver.OracleDriver"
          connectionURL="jdbc:oracle:thin:@ntserver:1521:ORCL"
         connectionName="scott" connectionPassword="tiger"
              userTable="users" userNameCol="user_name" userCredCol="user_pass"
          userRoleTable="user_roles" roleNameCol="role_name" />
      -->

      <!--
      <Realm  className="org.apache.catalina.realm.JDBCRealm"
             driverName="sun.jdbc.odbc.JdbcOdbcDriver"
          connectionURL="jdbc:odbc:CATALINA"
              userTable="users" userNameCol="user_name" userCredCol="user_pass"
          userRoleTable="user_roles" roleNameCol="role_name" />
      -->

      <!-- Define the default virtual host
           Note: XML Schema validation will not work with Xerces 2.2.
       -->
      <Host name="localhost" appBase="webapps"
       unpackWARs="true" autoDeploy="true"
       xmlValidation="false" xmlNamespaceAware="false">

        <!-- Defines a cluster for this node,
             By defining this element, means that every manager will be changed.
             So when running a cluster, only make sure that you have webapps in there
             that need to be clustered and remove the other ones.
             A cluster has the following parameters:

             className = the fully qualified name of the cluster class

             name = a descriptive name for your cluster, can be anything

             mcastAddr = the multicast address, has to be the same for all the nodes

             mcastPort = the multicast port, has to be the same for all the nodes
             
             mcastBindAddr = bind the multicast socket to a specific address
             
             mcastTTL = the multicast TTL if you want to limit your broadcast
             
             mcastSoTimeout = the multicast readtimeout 

             mcastFrequency = the number of milliseconds in between sending a "I'm alive" heartbeat

             mcastDropTime = the number a milliseconds before a node is considered "dead" if no heartbeat is received

             tcpThreadCount = the number of threads to handle incoming replication requests, optimal would be the same amount of threads as nodes 

             tcpListenAddress = the listen address (bind address) for TCP cluster request on this host, 
                                in case of multiple ethernet cards.
                                auto means that address becomes
                                InetAddress.getLocalHost().getHostAddress()

             tcpListenPort = the tcp listen port

             tcpSelectorTimeout = the timeout (ms) for the Selector.select() method in case the OS
                                  has a wakup bug in java.nio. Set to 0 for no timeout

             printToScreen = true means that managers will also print to std.out

             expireSessionsOnShutdown = true means that 

             useDirtyFlag = true means that we only replicate a session after setAttribute,removeAttribute has been called.
                            false means to replicate the session after each request.
                            false means that replication would work for the following piece of code: (only for SimpleTcpReplicationManager)
                            <%
                            HashMap map = (HashMap)session.getAttribute("map");
                            map.put("key","value");
                            %>
             replicationMode = can be either 'pooled', 'synchronous' or 'asynchronous'.
                               * Pooled means that the replication happens using several sockets in a synchronous way. Ie, the data gets replicated, then the request return. This is the same as the 'synchronous' setting except it uses a pool of sockets, hence it is multithreaded. This is the fastest and safest configuration. To use this, also increase the nr of tcp threads that you have dealing with replication.
                               * Synchronous means that the thread that executes the request, is also the
                               thread the replicates the data to the other nodes, and will not return until all
                               nodes have received the information.
                               * Asynchronous means that there is a specific 'sender' thread for each cluster node,
                               so the request thread will queue the replication request into a "smart" queue,
                               and then return to the client.
                               The "smart" queue is a queue where when a session is added to the queue, and the same session
                               already exists in the queue from a previous request, that session will be replaced
                               in the queue instead of replicating two requests. This almost never happens, unless there is a 
                               large network delay.
        -->             
        <!--
            When configuring for clustering, you also add in a valve to catch all the requests
            coming in, at the end of the request, the session may or may not be replicated.
            A session is replicated if and only if all the conditions are met:
            1. useDirtyFlag is true or setAttribute or removeAttribute has been called AND
            2. a session exists (has been created)
            3. the request is not trapped by the "filter" attribute

            The filter attribute is to filter out requests that could not modify the session,
            hence we don't replicate the session after the end of this request.
            The filter is negative, ie, anything you put in the filter, you mean to filter out,
            ie, no replication will be done on requests that match one of the filters.
            The filter attribute is delimited by ;, so you can't escape out ; even if you wanted to.

            filter=".*\.gif;.*\.js;" means that we will not replicate the session after requests with the URI
            ending with .gif and .js are intercepted.
            
            The deployer element can be used to deploy apps cluster wide.
            Currently the deployment only deploys/undeploys to working members in the cluster
            so no WARs are copied upons startup of a broken node.
            The deployer watches a directory (watchDir) for WAR files when watchEnabled="true"
            When a new war file is added the war gets deployed to the local instance,
            and then deployed to the other instances in the cluster.
            When a war file is deleted from the watchDir the war is undeployed locally 
            and cluster wide
        -->
        
        <!--
        <Cluster className="org.apache.catalina.cluster.tcp.SimpleTcpCluster"
                 managerClassName="org.apache.catalina.cluster.session.DeltaManager"
                 expireSessionsOnShutdown="false"
                 useDirtyFlag="true"
                 notifyListenersOnReplication="true">

            <Membership 
                className="org.apache.catalina.cluster.mcast.McastService"
                mcastAddr="228.0.0.4"
                mcastPort="45564"
                mcastFrequency="500"
                mcastDropTime="3000"/>

            <Receiver 
                className="org.apache.catalina.cluster.tcp.ReplicationListener"
                tcpListenAddress="auto"
                tcpListenPort="4001"
                tcpSelectorTimeout="100"
                tcpThreadCount="6"/>

            <Sender
                className="org.apache.catalina.cluster.tcp.ReplicationTransmitter"
                replicationMode="pooled"
                ackTimeout="15000"/>

            <Valve className="org.apache.catalina.cluster.tcp.ReplicationValve"
                   filter=".*\.gif;.*\.js;.*\.jpg;.*\.png;.*\.htm;.*\.html;.*\.css;.*\.txt;"/>
                   
            <Deployer className="org.apache.catalina.cluster.deploy.FarmWarDeployer"
                      tempDir="/tmp/war-temp/"
                      deployDir="/tmp/war-deploy/"
                      watchDir="/tmp/war-listen/"
                      watchEnabled="false"/>
        </Cluster>
        -->        



        <!-- Normally, users must authenticate themselves to each web app
             individually.  Uncomment the following entry if you would like
             a user to be authenticated the first time they encounter a
             resource protected by a security constraint, and then have that
             user identity maintained across *all* web applications contained
             in this virtual host. -->
        <!--
        <Valve className="org.apache.catalina.authenticator.SingleSignOn" />
        -->

        <!-- Access log processes all requests for this virtual host.  By
             default, log files are created in the "logs" directory relative to
             $CATALINA_HOME.  If you wish, you can specify a different
             directory with the "directory" attribute.  Specify either a relative
             (to $CATALINA_HOME) or absolute path to the desired directory.
        -->
        <!--
        <Valve className="org.apache.catalina.valves.AccessLogValve"
                 directory="logs"  prefix="localhost_access_log." suffix=".txt"
                 pattern="common" resolveHosts="false"/>
        -->

        <!-- Access log processes all requests for this virtual host.  By
             default, log files are created in the "logs" directory relative to
             $CATALINA_HOME.  If you wish, you can specify a different
             directory with the "directory" attribute.  Specify either a relative
             (to $CATALINA_HOME) or absolute path to the desired directory.
             This access log implementation is optimized for maximum performance,
             but is hardcoded to support only the "common" and "combined" patterns.
        -->
        <!--
        <Valve className="org.apache.catalina.valves.FastCommonAccessLogValve"
                 directory="logs"  prefix="localhost_access_log." suffix=".txt"
                 pattern="common" resolveHosts="false"/>
        -->
        <!-- Access log processes all requests for this virtual host.  By
             default, log files are created in the "logs" directory relative to
             $CATALINA_HOME.  If you wish, you can specify a different
             directory with the "directory" attribute.  Specify either a relative
             (to $CATALINA_HOME) or absolute path to the desired directory.
             This access log implementation is optimized for maximum performance,
             but is hardcoded to support only the "common" and "combined" patterns.

             This valve use NIO direct Byte Buffer to asynchornously store the
             log.
        -->
        <!--
        <Valve className="org.apache.catalina.valves.ByteBufferAccessLogValve"
                 directory="logs"  prefix="localhost_access_log." suffix=".txt"
                 pattern="common" resolveHosts="false"/>
        -->

      </Host>

    </Engine>

  </Service>

</Server>









�W�三步：(x��)在Tomcat/conf/Catalina/localhost目录下徏立一个和你网站文件夹名字一��L(f��ng)��XML文�g�?
例如�Q�myweb.xml。内容如下：(x��)
<?xml version="1.0" encoding="UTF-8"?>
<Context>
 <Resource
      name="jdbc/mysql"
      type="javax.sql.DataSource"
      password="********"
      driverClassName="org.gjt.mm.mysql.Driver"
      maxIdle="2"
      maxWait="1000"
      username="root"
      url="jdbc:mysql://127.0.0.1/test"
      maxActive="4"/>
</Context>
注：(x��)�q�一步非帔R���?如果没有�q�步��׃��(x��)出错,�?x��)出现org.apache.tomcat.dbcp.dbcp.SQLNestedException: Cannot create JDBC driver of class '' for connect URL 'null'错误�?
最后，在你自己�|�站�?WEB-INF/web.xml文�g中，��d��以下代码�Q?
<resource-ref>
    <description>DB Connection</description>
    <res-ref-name>jdbc/mysql</res-ref-name>
    <res-type>javax.sql.DataSource</res-type>
    <res-auth>Container</res-auth>
</resource-ref>

OK。配�|�全部完成。现在你可以写代码测试这个数据库�q�接池了(ji��n)。如�Q?
DataSource ds = null;
InitialContext ctx=new InitialContext();
ds=(DataSource)ctx.lookup("java:comp/env/jdbc/mysql");
Connection conn = ds.getConnection();
　　数据库连接对象得��C��(ji��n)�?
<img src ="http://www.aygfsteel.com/soft/aggbug/83948.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.aygfsteel.com/soft/" target="_blank">书法</a> 2006-11-28 03:25 <a href="http://www.aygfsteel.com/soft/archive/2006/11/28/83948.html#Feedback" target="_blank" style="text-decoration:none;">发表评论</a></div>]]></description></item><item><title>mysql 常用操作命��o(h��)</title><link>http://www.aygfsteel.com/soft/archive/2006/11/24/psoft.html</link><dc:creator>书法</dc:creator><author>书法</author><pubDate>Fri, 24 Nov 2006 09:41:00 GMT</pubDate><guid>http://www.aygfsteel.com/soft/archive/2006/11/24/psoft.html</guid><wfw:comment>http://www.aygfsteel.com/soft/comments/83328.html</wfw:comment><comments>http://www.aygfsteel.com/soft/archive/2006/11/24/psoft.html#Feedback</comments><slash:comments>1</slash:comments><wfw:commentRss>http://www.aygfsteel.com/soft/comments/commentRss/83328.html</wfw:commentRss><trackback:ping>http://www.aygfsteel.com/soft/services/trackbacks/83328.html</trackback:ping><description><![CDATA[
		<p>
				<font size="2">有些时候我们不得不�ȝ��命��o(h��)行操作mysql数据�?下面是笔者�ȝ��的常见操作命�?<br /><br />1.�q�接 <br /> (t��ng) 命��o(h��): (t��ng) mysql -h��L��地址 -u用户�?-p密码<br /> (t��ng) 本地:�q�接 (t��ng) (t��ng) cmd�q�入mysql/bin之后, 输入mysql -uroot -p然后回�R �?x��)提�C�Z��输入密码 接着回�R卛_��(如果密码为空);<br /> (t��ng) �q�程�q�接:假设�q�程��L��的IP为：(x��)222.222.212.212�Q�用户名为root,密码为abcdef。则键入以下命��o(h��)�Q?br /> (t��ng) (t��ng) (t��ng) (t��ng) mysql -h222.222.212.212  (t��ng)-uroot (t��ng) -pabcdef<br /><br />2.�Ҏ(gu��)��据库和表的操�?br /> (t��ng) (t��ng) (t��ng)<br /> (t��ng) (t��ng) (t��ng)查看用户拥有权限的数据库 (t��ng): (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) show databases;(注意分号)<br /> (t��ng)<br /> (t��ng) (t��ng) 创徏数据库test: (t��ng) create database testdb;<br /><br /> (t��ng) (t��ng) 切换到testdb数据�? (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) use testdb;<br /><br /> (t��ng) (t��ng) 删除数据库testdb: drop database (t��ng)testdb;<br /><br /> (t��ng) (t��ng) 查看当前数据库中有权限的�? show tables;</font>
		</p>
		<p>
				<font size="2"> (t��ng) (t��ng) 创徏表s_position,department,,depart_pos,testtable:<br /> (t��ng) (t��ng) (t��ng) (t��ng) create table s_position<br /> (t��ng) (t��ng) (t��ng) (t��ng) (<br /> (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) id int not null auto_increment,<br /> (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) name varchar(20) not null default (t��ng) '�l�理', (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) #讑֮�默认�?br /> (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) description varchar(100),<br /> (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) primary key PK_positon (id) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng)  (t��ng)#讑֮�主键<br /> (t��ng) (t��ng) (t��ng) (t��ng) ); (t��ng) (t��ng) (t��ng) (t��ng) <br /> (t��ng) (t��ng) (t��ng) (t��ng) create table department<br /> (t��ng) (t��ng) (t��ng) (t��ng) (<br /> (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) id int not null auto_increment,<br /> (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) name varchar(20) not null default '�pȝ���?, (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) #讑֮�默认�?br /> (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) description varchar(100),<br /> (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) primary key PK_department (id) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) #讑֮�主键<br /> (t��ng) (t��ng) (t��ng) (t��ng) );<br /> (t��ng) (t��ng) (t��ng) (t��ng) create table depart_pos<br /> (t��ng) (t��ng) (t��ng) (t��ng) (<br /> (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) department_id int not null,<br /> (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) position_id int not null,<br /> (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) primary key PK_depart_pos (department_id,position_id) (t��ng) #讑֮�复和主键<br /> (t��ng) (t��ng) (t��ng) (t��ng) );<br /> (t��ng) (t��ng) (t��ng) (t��ng) create table testtable<br /> (t��ng) (t��ng) (t��ng) (t��ng) (<br /> (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) id int not null auto_increment primary key, (t��ng) (t��ng) (t��ng) (t��ng) #讑֮�主键<br /> (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) name varchar(20) not null default '无名�?, (t��ng) #讑֮�默认�?br /> (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) department_id int not null,<br /> (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) position_id int not null,<br /> (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) unique (department_id,position_id) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) #讑֮�唯一�?br /> (t��ng) (t��ng) (t��ng) (t��ng) );<br /><br /> (t��ng) (t��ng) 查看表testtable的结�? (t��ng) (t��ng) desc testtable;</font>
		</p>
		<p>
				<font size="2"> (t��ng) (t��ng) 删除表testtable: (t��ng) (t��ng) (t��ng) (t��ng) (t��ng)<br /> (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) drop table testtable; (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng)<br /><br /> (t��ng) 修改表结�?操作数据(�?�?�?�?<br /> (t��ng) (t��ng) (t��ng).....(同sql语句,�?<br /><br /> (t��ng)3. 备䆾和恢�?<br /> (t��ng) (t��ng) �Ҏ(gu��)��据的备䆾和恢复命�?在网上有许多�U�版�?�l�笔者亲�w�测�?下面的命令是可行�Ҏ(gu��)��之一:<br /> (t��ng) (t��ng) (t��ng)<br /> (t��ng) (t��ng) (t��ng) 备䆾数据库testdb: (t��ng) (t��ng)<br /> (t��ng) (t��ng) (t��ng) 本地:mysqldump -uroot (t��ng) -pabcdef testdb&gt;e:testdb.sql (t��ng)<br /> (t��ng) (t��ng) (t��ng) �q�程:mysqldump -h222.222.212.212 -uroot (t��ng) -pabcdef testdb&gt;e:testdb.sql (t��ng)<br /> (t��ng) (t��ng) (t��ng)�q�里假设数据库的用户名和密码分别是root和abcdef, 导出到额盘根目录�?得到的testdb.sql是一个sql脚本�Q�不包括建库的语句，所以你需要手工创建数据库下次才可以导�?恢复数据库testdb;<br /> (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng)<br /> (t��ng) (t��ng) (t��ng) (t��ng) 恢复数据库testdb: (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng)首先 需要创��Z��个空库testdb(原因如上);<br /> (t��ng) (t��ng) (t��ng) (t��ng) 命��o(h��): (t��ng) (t��ng) <br /> (t��ng) (t��ng) (t��ng) (t��ng) 本地:mysql -uroot -pabcdef (t��ng) testdb&lt;e:testdb.sql (t��ng) (t��ng) (t��ng) (t��ng)<br /> (t��ng) (t��ng) (t��ng) (t��ng) �q�程:mysql -h222.222.212.212 (t��ng) -uroot -pabcdef (t��ng) testdb&lt;e:testdb.sql (t��ng) (t��ng) (t��ng) (t��ng)<br /> (t��ng) (t��ng) (t��ng) (t��ng) 后面e:testdb.db代表本地sql文�g路径,如果mysql安装在本地可以把sql文�g考到mysql/bin的安装目录下,��׃��用写路径�?<br /><br /><br />�?在网上有些朋友说,mysql的安装目录必���Mؓ(f��)默认目录(即c:/mysql),否则�?x��)出问�?�W�者也���验�?ji��n)一下在安装d盘的效果,�l�果暂时没有发现什么问�?,�q�说明有时候命令执行异常可能和安装目录无关.^_^</font>
		</p>
<img src ="http://www.aygfsteel.com/soft/aggbug/83328.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.aygfsteel.com/soft/" target="_blank">书法</a> 2006-11-24 17:41 <a href="http://www.aygfsteel.com/soft/archive/2006/11/24/psoft.html#Feedback" target="_blank" style="text-decoration:none;">发表评论</a></div>]]></description></item><item><title>囄����~�辑器的实现--��Z��JAVA技�?/title><link>http://www.aygfsteel.com/soft/archive/2006/11/21/82618.html</link><dc:creator>书法</dc:creator><author>书法</author><pubDate>Tue, 21 Nov 2006 14:08:00 GMT</pubDate><guid>http://www.aygfsteel.com/soft/archive/2006/11/21/82618.html</guid><wfw:comment>http://www.aygfsteel.com/soft/comments/82618.html</wfw:comment><comments>http://www.aygfsteel.com/soft/archive/2006/11/21/82618.html#Feedback</comments><slash:comments>3</slash:comments><wfw:commentRss>http://www.aygfsteel.com/soft/comments/commentRss/82618.html</wfw:commentRss><trackback:ping>http://www.aygfsteel.com/soft/services/trackbacks/82618.html</trackback:ping><description><![CDATA[		<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 21pt; TEXT-INDENT: -21pt; mso-list: l0 level1 lfo1; tab-stops: list 21.0pt" align="left">
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						<span style="FONT-FAMILY: �?hu��)�? mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">技术概�q?/span>
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		<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 10.5pt; mso-char-indent-count: 1.0">
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						<span lang="EN-US">Java</span>
						<span style="FONT-FAMILY: �?hu��)�? mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">完全可以�?gu��)���的实现多媒体的编辑与处理�Q�包括图象的处理技术（</span>
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						<span style="FONT-FAMILY: �?hu��)�? mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">�Q�、声韌���频技术（</span>
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						<span style="FONT-FAMILY: �?hu��)�? mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">对图象处理进行了(ji��n)很好的支持，通过</span>
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								<font size="2">java.awt.color、java.awt.grahpics、java.awt.image、�?t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng)?br /> (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng)java.awt.image.bufferedimage�?span style="mso-bidi-font-weight: bold">java.awt.image.LookupOp</span>�?/font>
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						<span style="FONT-FAMILY: �?hu��)�? mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">囑�Ş图象处理可以完成的功能：(x��)</span>
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						<span lang="EN-US">.</span>
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						<span lang="EN-US">……………�?<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /?><o:p></o:p></span>
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						<span style="FONT-FAMILY: �?hu��)�? mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">关于使用</span>
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						<span style="FONT-FAMILY: �?hu��)�? mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">关于</span>
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						<span style="FONT-FAMILY: �?hu��)�? mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">开放性是</span>
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						<span style="FONT-FAMILY: �?hu��)�? mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">生命力的源泉�Q�它不属于一个单独的公司�Q�尽��?/span>
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				</font>
				<font size="2">
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						<span style="FONT-FAMILY: �?hu��)�? mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">最大的特点���是�Ҏ(gu��)��上手。花上两三个月时��_(d��)��你就可以像模像样地当软�g工程师了(ji��n)。相比之下，</span>
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						<span lang="EN-US">�?</span>
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						<span style="FONT-FAMILY: �?hu��)�? mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">不过�Q�是同意</span>
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						<span style="FONT-FAMILY: �?hu��)�? mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">中的开发框架模式及(qi��ng)诸多优秀开源组件更有�h(hu��n)��|���q�是要更注重</span>
						<span lang="EN-US">.net</span>
						<span style="FONT-FAMILY: �?hu��)�? mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的开发效率，�q�要�Ҏ(gu��)��企业以及(qi��ng)��目自��n来抉择，如果对于一个有着深厚的开发积累或者打���在相当一�D�|��间长期��用的��目来说�Q�没有采�?/span>
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						<span style="FONT-FAMILY: �?hu��)�? mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">开发��^台的���是一个不太合理的事情�Q�因��Z��长期看来�Q�新的��^台系�l�的混合使用必然�?x��)造成一些��品的不同�q�_��的重复开发，而另一斚w��因�ؓ(f��)</span>
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						<span style="FONT-FAMILY: �?hu��)�? mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">独有的设计模式框�Ӟ���?x��)让一�?/span>
						<span lang="EN-US">java</span>
						<span style="FONT-FAMILY: �?hu��)�? mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">�E�序的后期维护变得相当简单容易，由此看来�Q�它的开发成本�ƈ不一定会(x��)比其它语�a�的开发费用要高�?/span>
				</font>
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						<span style="FONT-FAMILY: �?hu��)�? mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">此前�Q?/span>
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						<span style="FONT-FAMILY: �?hu��)�? mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">公司发布的一个报告显�C�，</span>
						<span lang="EN-US">62%</span>
						<span style="FONT-FAMILY: �?hu��)�? mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的中���企业已�l�采用了(ji��n)</span>
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						<span style="FONT-FAMILY: �?hu��)�? mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的企业则采用��Z��</span>
						<span lang="EN-US">Java</span>
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						<span style="FONT-FAMILY: �?hu��)�? mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">�{�服务��^台。包括微软公司开发业务的负责人约���W����哥马利也曄���表示�Q��?/span>
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						<span lang="EN-US">java</span>
						<span style="FONT-FAMILY: �?hu��)�? mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">技术而言�Q�可以直接调�?/span>
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						<span style="FONT-FAMILY: �?hu��)�? mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">开源社��Z��有不���开源的�l��g�Q�从效率上考虑�Q�显然后者是一�U�更好的选择�Q��ƈ且相信在</span>
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				<font size="2">
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		<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 42pt; TEXT-INDENT: -10.5pt; mso-char-indent-count: -1.0; mso-para-margin-left: 3.0gd">
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				</font>
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				<font size="2">
						<span style="FONT-FAMILY: �?hu��)�? mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">理由�Q�语�a�本��n无所谓好不好�Q�它只是一个工��P��它们都是��Z�品服务的�Q�而��品又是�ؓ(f��)客户服务的，所以采用什么��^台来开发��品最�l�是用户说了(ji��n)���，</span>
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		<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 42pt; mso-para-margin-left: 4.0gd">
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		<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 42pt; mso-para-margin-left: 4.0gd">
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		<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 42pt; mso-para-margin-left: 4.0gd">
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				<font size="2">
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								<span style="mso-spacerun: yes"> (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) </span>
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<img src ="http://www.aygfsteel.com/soft/aggbug/82618.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.aygfsteel.com/soft/" target="_blank">书法</a> 2006-11-21 22:08 <a href="http://www.aygfsteel.com/soft/archive/2006/11/21/82618.html#Feedback" target="_blank" style="text-decoration:none;">发表评论</a></div>]]></description></item><item><title>JNI技术在嵌入式��Y件开发中的应用学�?f��n)笔��C���?/title><link>http://www.aygfsteel.com/soft/archive/2006/11/13/80789.html</link><dc:creator>书法</dc:creator><author>书法</author><pubDate>Sun, 12 Nov 2006 20:25:00 GMT</pubDate><guid>http://www.aygfsteel.com/soft/archive/2006/11/13/80789.html</guid><wfw:comment>http://www.aygfsteel.com/soft/comments/80789.html</wfw:comment><comments>http://www.aygfsteel.com/soft/archive/2006/11/13/80789.html#Feedback</comments><slash:comments>1</slash:comments><wfw:commentRss>http://www.aygfsteel.com/soft/comments/commentRss/80789.html</wfw:commentRss><trackback:ping>http://www.aygfsteel.com/soft/services/trackbacks/80789.html</trackback:ping><description><![CDATA[		<p>
				<font size="2">通过前两���文章的介绍�Q�现在给��Z��个JNI的HelloWrold应用例子�Q�用于抛砖引玉：(x��)<br /><br />步骤�Q?br /><font color="#666666" size="3"><font color="#000000"> (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng)a.</font><font size="2"><font color="#000000">�~�写带有native声明的方法的java�c?br />　　<br />　　b.使用javac命��o(h��)�~�译所�~�写的java�c?br />　　<br />　　c.使用javah ?jni java�c�d��生成扩展名�ؓ(f��)h的头文�g<br />　　<br />　　d.使用C/C++实现本地�Ҏ(gu��)��<br />　　<br />　　e.���C/C++�~�写的文件生成动态连接库<br />　　<br />　　f. �q�行 ok<br /></font><br /></font></font>详细介绍�Q?br /><font color="#000000"> (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) </font><font color="#000000">1) �~�写java�E�序�Q?br />　　<br />　　�q�里以HelloWorld��Z���?br />　　<br />　　代码1�Q?br />　　<br />　　class HelloWorld {<br />　　public native void displayHelloWorld();<br />　　<br />　　static {<br />　　System.loadLibrary("hello");<br />　　}<br />　　<br />　　public static void main(String[] args) {<br />　　new HelloWorld().displayHelloWorld();<br />　　}<br />　　}<br />　　<br />　　声明native�Ҏ(gu��)���Q�如果你惛_��一个方法做��Z��个本地方法的话，那么你就必须声明�Ҏ(gu��)��法�ؓ(f��)native的，�q�且不能实现。其中方法的参数和返回值在后面讲述�?br />　　<br />　　Load动态库�Q�System.loadLibrary("hello");加蝲动态库�Q�我们可以这��L(f��ng)��解：(x��)我们的方法displayHelloWorld()没有实现�Q�但是我们在下面���q��接��用了(ji��n)�Q�所以必���d��使用之前对它�q�行初始化）(j��)�q�里一般是以static块进行加载的。同旉���要注意的是System.loadLibrary();的参数“hello”是动态库的名字�?br />　　<br />　　main()�Ҏ(gu��)��<br />　　<br />　　2) �~�译没有什么好说的�?br />　　<br />　　javac HelloWorld.java<br />　　<br />　　3) 生成扩展名�ؓ(f��)h的头文�g<br />　　<br />　　javah ?jni HelloWorld<br />　　<br />　　头文件的内容�Q?br />　　/* DO NOT EDIT THIS FILE - it is machine generated */<br />　　#include <br />　　/* Header for class HelloWorld */<br />　　<br />　　#ifndef _Included_HelloWorld<br />　　#define _Included_HelloWorld<br />　　#ifdef __cplusplus<br />　　extern "C" {<br />　　#endif<br />　　/*<br />　　* Class:　　 HelloWorld<br />　　* Method:　　displayHelloWorld<br />　　* Signature: ()V<br />　　*/<br />　　JNIEXPORT void JNICALL Java_HelloWorld_displayHelloWorld<br />　　(JNIEnv *, jobject);<br />　　<br />　　#ifdef __cplusplus<br />　　}<br />　　#endif<br />　　#endif<br />　　<br />　　�Q�这里我们可以这��L(f��ng)��解：(x��)�q�个h文�g相当于我们在java里面的接口，�q�里声明�?ji��n)一个Java_HelloWorld_displayHelloWorld (JNIEnv *, jobject);�Ҏ(gu��)���Q�然后在我们的本地方法里面实现这个方法，也就是说我们在编写C(j��)/C++�E�序的时候所使用的方法名必须和这里的一��_(d��)��(j��)�?br />　　<br />　　4) �~�写本地�Ҏ(gu��)��<br />　　<br />　　实现和由javah命��o(h��)生成的头文�g里面声明的方法名相同的方法�?br />　　<br />　　代码2�Q?br />　　<br />　　1 #include <br />　　2 #include "HelloWorld.h"<br />　　3 #include <br />　　4 JNIEXPORT void JNICALL Java_HelloWorld_displayHelloWorld(JNIEnv *env, jobject obj)<br />　　{<br />　　printf("Hello world!\n");<br />　　return;<br />　　}<br />　　<br />　　注意代码2中的�W?行，需要将jni.h�Q�该文�g可以�?JAVA_HOME%/include文�g夹下面找刎ͼ�(j��)文�g引入�Q�因为在�E�序中的JNIEnv、jobject�{�类型都是在该头文�g中定义的�Q�另外在�W?行需要将HelloWorld.h头文件引入（我是�q�么理解的：(x��)相当于我们在�~�写java�E�序的时候，实现一个接口的话需要声明才可以�Q�这里就是将HelloWorld.h头文仉���面声明的�Ҏ(gu��)��加以实现。当然不一定是�q�样�Q�。然后保存�(sh��)ؓ(f��)HelloWorldImpl.c���ok�?ji��n)�?br />　　<br />　　5) 生成动态库<br />　　<br />　　�q�里以在Windows中�ؓ(f��)例，需要生成dll文�g。在保存HelloWorldImpl.c文�g夹下面，使用VC的编译器cl成�?br />　　<br />　　cl -I%java_home%\include -I%java_home%\include\win32 -LD HelloWorldImp.c -Fehello.dll<br />　　<br />　　注意�Q�生成的dll文�g名在选项-Fe后面配置�Q�这里是hello�Q�因为在HelloWorld.java文�g中我们loadLibary的时候��用的名字是hello。当然这里修改之后那里也需要修攏V��另外需要将-I%java_home%\include -I%java_home%\include\win32参数加上�Q�因为在�W�四步里面编写本地方法的时候引入了(ji��n)jni.h文�g�?br />　　<br />　　6) �q�行�E�序<br />　　<br />　　java HelloWorld���ok�?ji��n)�?br /></font><br /> (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) 如有问题�Q�欢�q�讨��Z�����。^_^<br /><br /></font>
		</p>
<img src ="http://www.aygfsteel.com/soft/aggbug/80789.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.aygfsteel.com/soft/" target="_blank">书法</a> 2006-11-13 04:25 <a href="http://www.aygfsteel.com/soft/archive/2006/11/13/80789.html#Feedback" target="_blank" style="text-decoration:none;">发表评论</a></div>]]></description></item><item><title>JNI技术在嵌入式��Y件开发中的应用学�?f��n)笔��C���?/title><link>http://www.aygfsteel.com/soft/archive/2006/11/13/80788.html</link><dc:creator>书法</dc:creator><author>书法</author><pubDate>Sun, 12 Nov 2006 20:16:00 GMT</pubDate><guid>http://www.aygfsteel.com/soft/archive/2006/11/13/80788.html</guid><wfw:comment>http://www.aygfsteel.com/soft/comments/80788.html</wfw:comment><comments>http://www.aygfsteel.com/soft/archive/2006/11/13/80788.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.aygfsteel.com/soft/comments/commentRss/80788.html</wfw:commentRss><trackback:ping>http://www.aygfsteel.com/soft/services/trackbacks/80788.html</trackback:ping><description><![CDATA[		<font size="2">接上�Q?br />(1)�~�写Java�c�M���?br /> (t��ng) (t��ng) (t��ng) 其中�Q�需要JNI实现的方法应当用native关键字声明。在该类中，用System�Q?oadLibrary()�Ҏ(gu��)��加蝲需要的动态链接库。关键代码如下：(x��)<br /> (t��ng) (t��ng) (t��ng) �Q�／Compute.java<br /> (t��ng) (t��ng) (t��ng) public class Compute{<br /> (t��ng) (t��ng) (t��ng) public native double comp (double params);<br /> (t��ng) (t��ng) (t��ng) static{<br /> (t��ng) (t��ng) (t��ng) �Q�／调用动态链接库<br /> (t��ng) (t��ng) (t��ng) System�Q�loadLibrary(“mathlib�?�Q?br /> (t��ng) (t��ng) (t��ng) }<br /> (t��ng) (t��ng) (t��ng) (t��ng)<br />(2)�~�译成字节代�?br /> (t��ng) (t��ng) (t��ng) 在这个过�E�中�Q�由于采用了(ji��n)native关键字声明，Java�~�译器会(x��)忽视没有代码体的JNI�Ҏ(gu��)��部分�?br /> (t��ng) (t��ng) <br /> (t��ng)(3)生成相关JNI�Ҏ(gu��)��的头文�g<br /> (t��ng) (t��ng) (t��ng) �q�个�q�程的实��C��般是通过利用jlavah-jni * class生成的，也可以手工生成该文�g�Q�但是由�?/font>
		<font size="2">Java</font>
		<font size="2">虚拟机是�Ҏ(gu��)��一定的命名规范完成对JNI�Ҏ(gu��)��的调用，所以手工编写头文�g需要特别小�?j��)�?br /> (t��ng) (t��ng) (t��ng) 上述文�g产生的头文�g部分代码如下�Q?br /> (t��ng) (t��ng) (t��ng) �Q�／Compute.h<br /> (t��ng) (t��ng) (t��ng) ;<br /> (t��ng) (t��ng) (t��ng) extern“C”{<br /> (t��ng) (t��ng) (t��ng) JNIEXPORT jdoubleJNICALL Java_Compute_comp(JNI-Env *, jobject, jdoubleArray)�Q?br /> (t��ng) (t��ng) (t��ng) ;<br /> (t��ng) (t��ng) (t��ng) JNI函数名称分�ؓ(f��)三部分：(x��)首先是Java关键字，供Java虚拟�����别；然后是调用者类名称(全限定的�c�d���Q�其中用下划�U�代替名�U�分隔符)�Q�最后是对应的方法名�U�ͼ�各段名称之间用下划线分割�?br /> (t��ng) (t��ng) (t��ng) JNI函数的参��C���׃��部分�l�成�Q�首先是JNIEnv *,是一个指向JNI�q�行环境的指针；�W�二个参数随本地�Ҏ(gu��)��是静(r��n)态还是非�?r��n)态而有所不同一一非静(r��n)态本地方法的�W�二个参数是对对象的引用�Q�而静(r��n)态本地方法的�W�二个参数是对其Java�cȝ��引用�Q�其余的参数对应通常Java�Ҏ(gu��)��的参敎ͼ�参数�c�d��需要根据一定规则进行映����?/font>
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				<font size="2"> (t��ng) (t��ng) (t��ng) (4)�~�写相应�Ҏ(gu��)��的实��C���?br /> (t��ng) (t��ng) (t��ng) 在编码过�E�中�Q�需要注意变量的长度问题�Q�例如Java的整型变量长度�ؓ(f��)32位，而C语言�?6位，所以要仔细核对变量�c�d��映射表，防止在传��D���E�中出现问题�?/font>
		</p>
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				<font size="2"> (t��ng) (t��ng) (t��ng) (5)���JNI实现代码�~�译成动态链接库<br /> (t��ng) (t��ng) (t��ng) �~�译�q�程是利用C�Q�C++�~�译器实现的�Q�当要��用生成的动态链接库�Ӟ��调用者类中需要显式调用该链接库�?br /> (t��ng) (t��ng) (t��ng) �l�过上述处理�Q�基本上完成�?ji��n)一个包含本地化�Ҏ(gu��)��的Java�cȝ��开发�?/font>
		</p>
		<p align="left">
				<font size="2"> (t��ng) (t��ng) (t��ng) (t��ng) 3 ��Z��JNI的嵌入式手机软�g开发实�?br /> (t��ng) (t��ng) (t��ng) 下面通过一个实例来描述�q�用</font>
				<font size="2">JNI技�?/font>
				<font size="2">在手��Z��操纵摄像��_(d��)��捕捉视频�q�存储图片的�q�程�?br /> (t��ng) (t��ng) (t��ng) (1)�z�d���Q�状态图<br /> (t��ng) (t��ng) (t��ng) �?为捕捉视频�ƈ存储囄���的活动／状态图</font>
				<img style="WIDTH: 479px; HEIGHT: 603px" height="603" src="http://www.aygfsteel.com/images/blogjava_net/soft/17148/o_s1.jpg" width="646" />
				<br />
				<br /> (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng)<a title="图二" href="/images/blogjava_net/soft/17148/r_s0.jpg" target="_blank"><font color="#ff0000">点击查看原图</font></a><br /><font size="2">�Ҏ(gu��)���?的活动／状态，具体的对应步骤如下：(x��)<br /> (t��ng) (t��ng) (t��ng) ①发赯������程�?br /> (t��ng) (t��ng) (t��ng) ②发��h���E�后�Q�徏立文件用于存储图片�?br /> (t��ng) (t��ng) (t��ng) ③用指针获得分配的缓冲器�Q�用于存储获得的帧�?br /> (t��ng) (t��ng) (t��ng) ④将指针压栈(序列化缓冲器)。由于手机的内存较小�Q��ؓ(f��)�?ji��n)防止内存泄漏，Symbian操作�pȝ��有一个Cleanup stack的要求，卛_��使用指针�Ӟ��用PushL把指针压入栈中，使用完后再用Pop弹出栈．如果在中间调用导致崩溃的函数时果真出��C��(ji��n)问题�Q�那么Clean up stack可以通过调用该指针的析构函数回收占用的空间�?br /> (t��ng) (t��ng) (t��ng) ⑤操�U�|��像头�Q�捕捉视频，�q�将囑փ����从摄像头端传到�~�冲器�?br /> (t��ng) (t��ng) (t��ng) ⑥将摄像头内的图像流存入�~�冲器内�Q��ƈ���缓冲器内的����{化�ؓ(f��)文�g���，存�(sh��)ؓ(f��)jpg格式的文�Ӟ�����指向缓冲器的指针弹栈�?br /> (t��ng) (t��ng) (t��ng) ⑦在�q�程⑥中�Q�如果��用完�?ji��n)序列化的缓冲器�Q�则要重新序列化�~�冲器，以备后面使用�?br /> (t��ng) (t��ng) (t��ng) ⑧当接收到停止视频捕捉的信号后，关闭文�g�?br /> (t��ng) (t��ng) (t��ng) ⑨流�E�结束�?br /> (t��ng)<br /> (t��ng) (t��ng) (t��ng) (t��ng) (2)�q�用JNI</font><font size="2">技�?/font><font size="2">的视频捕�?br /> (t��ng) (t��ng) (t��ng) 子功能捕捉视频的实现是由操纵摄像头、视频播�?解码器准�?以及(qi��ng)建立摄像头和手机之间的连接会(x��)话三个活动组成的。其中操�U�|��像头是通过调用底层讑֤�的驱动来实现的，需要利用JNI来实玎ͼ�完成的方法包括准备、徏立、删除、销毁摄像头�{�。视频播攄���一�p�d���q�程也是通过c++代码来实现的�Q�除�?ji��n)准备、徏立、删除、销毁解码器外，�q�有开始、暂停、停止解码等。徏立摄像头和手��Z��间的�q�接�c�M��建立客户端和服务器连接，视频���从摄像头传到手机界面是通过多媒体会(x��)话来完成的。多媒体<br />�?x��)话的徏立、关闭、摧毁以�?qi��ng)�?x��)话徏立后的发送、取消、读取数据等也是JNI的应用范畴�?br /></font><font size="2"><br /> (t��ng) (t��ng) (t��ng) (t��ng) �l�语<br /> (t��ng) (t��ng) (t��ng) ��d��采用�U�Java的�h们通常反对本地化代码的使用�Q�认为JNI技术会(x��)影响</font><font size="2">�E�序</font><font size="2">的可�U�L��性和安全性。还有一些�h认�ؓ(f��)�Q�在Java�E�序执行的过�E�中调用c�Q�c++�E�序只是对过��L؜合编�E�技术的���单扩展，其实际目的是��Z��(ji��n)充分利用大量原有的c�E�序库�?br /></font><br /><font size="2"> (t��ng) (t��ng) (t��ng) (t��ng) 其实�Q�不必拘泥于严格的��^台独立性限�Ӟ��因�ؓ(f��)采用JNI技术只是针对一些严重媄(ji��ng)响Java性能的代码段。该部分可能只占源程序的极少部分�Q�所以几乎可以不考虑该部分代码在��L���q�_��之间�U�L��的工作量。同�Ӟ��也不必过分担�?j��)类型匹配问题，完全可以控制代码不出现这�U�错误。此外，也不必担�?j��)安全控刉���题，因��?f��)Java安全模型已扩展�ؓ(f��)允许非系�l�类加蝲和调用本地方法，卛_��果在Java�E�序中直接调用c�Q�c++语言产生的机器码�Q�该部分代码的安全性就由Java虚拟机控制�?br /></font><br /><br /></p>
<img src ="http://www.aygfsteel.com/soft/aggbug/80788.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.aygfsteel.com/soft/" target="_blank">书法</a> 2006-11-13 04:16 <a href="http://www.aygfsteel.com/soft/archive/2006/11/13/80788.html#Feedback" target="_blank" style="text-decoration:none;">发表评论</a></div>]]></description></item><item><title>JNI技术在嵌入式��Y件开发中的应用学�?f��n)笔��C��一</title><link>http://www.aygfsteel.com/soft/archive/2006/11/13/posoft.html</link><dc:creator>书法</dc:creator><author>书法</author><pubDate>Sun, 12 Nov 2006 19:46:00 GMT</pubDate><guid>http://www.aygfsteel.com/soft/archive/2006/11/13/posoft.html</guid><wfw:comment>http://www.aygfsteel.com/soft/comments/80787.html</wfw:comment><comments>http://www.aygfsteel.com/soft/archive/2006/11/13/posoft.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.aygfsteel.com/soft/comments/commentRss/80787.html</wfw:commentRss><trackback:ping>http://www.aygfsteel.com/soft/services/trackbacks/80787.html</trackback:ping><description><![CDATA[
		<p>
				<font size="2">嵌入式系�l�是以应用�ؓ(f��)中心(j��)、以计算机技�?/font>
				<font size="2">为基���、��Y件硬件可裁剪、适应应用�pȝ��对功能、可靠性、成本、体�U�、功耗严��D��求的专用计算机系�l�。嵌入式软�g</font>
				<font size="2">的基本体�pȝ��构包括嵌入式实时操作�pȝ��RTOS(RealTime operating Systerrl)、嵌入式讑֤�驱动�E�序</font>
				<font size="2">、嵌入式应用�E�序�~�程接口(中间�?和嵌入式应用�E�序�?/font>
		</p>
		<p>
				<br />
				<font size="2"> (t��ng) (t��ng) (t��ng) 现阶�D�，计算机应用的普及(qi��ng)、互联网技术的实用以及(qi��ng)�U�米微电(sh��)子技术的�H�破�Q�正有力推动着21世纪的工业生产、商业活动、科学实验和家庭生活�{�领域自动化和信息化�q�程。全�q�程自动化��品制造、大范围�?sh��)子商务�z�d��、高度协同科学实验以�?qi��ng)现代化家居生活�Q��ؓ(f��)嵌入式��品造就�?ji��n)崭新而巨大的商机。除�?ji��n)沟通信息高速公路的交换机、�\由器和调制解调器�Q�构��������机集成刉���系�l?CIMS)所需的数据传输系�l�DCS(Data Communication System)和机器�h以及(qi��ng)规模较大的家用汽车电(sh��)子系�l�，最有��量效益和时代特征的嵌入式产品应数因特�|�上的信息家�?information appliances�Q�，如网�l�可视电(sh��)话、网�l�游戏机、电(sh��)子商务、商务�?PDA)、移动电(sh��)话以�?qi��ng)多媒体产�?如电(sh��)视机��盒、DVD播放机、电(sh��)子阅��L��)�?/font>
		</p>
		<p>
				<br />
				<font size="2"> (t��ng) (t��ng) (t��ng) 众所周知�Q�“一�ơ编�E�，到处使用”的</font>
				<font size="2">Java </font>
				<font size="2">软�g概念原本���是针对�|�上嵌入式小讑֤�提出的，几经周折�Q�目前SUN公司已推��Z��(ji��n)J2ME(Java 2 P1atform Micro Edition)针对信息家电(sh��)的Java版本�Q�其技术日���成熟，开始投入��用。SUN公司Java虚拟�?JVM)技术的有序开放，使得Java软�g真正实现跨��^台运行，即Java应用���程序能够在带有JVM的�Q何硬软�g�pȝ��上执行。加上Java语言本��n所��h��的安全性、可靠性和可移植性等特点�Q�对实现瘦��n上网的信息家�늭��|�络讑֤�十分有利�Q�同时对嵌入式设备特别是上网讑֤�软�g�~�程技术��生了(ji��n)很大的媄(ji��ng)响�?</font>
		</p>
		<p>
				<font size="2"> (t��ng) (t��ng) 1 Java的性能问题�?qi��ng)几�U�解��x(ch��ng)���?br /> (t��ng) (t��ng) (t��ng) Java�E�序也有其本�w�的�~�陷�Q�那���是其效率问题。由于Java是一�U�介于解释型和编译型之间的语�a��Q�其对内存的���理是通过JVM虚拟机来实现的，同样的程序，如果用编译型语言C来实玎ͼ�其运行速度一般要比Java快得多。因此，提高Java的性能���显得十分重要�?/font>
		</p>
		<p>
				<br />
				<font size="2"> (t��ng) (t��ng) (t��ng) �q�今为止�Q��h们�ؓ(f��)提高Java的运行速度而做出的许多努力�Q�主要集中在�E�序设计的方法和模式选择斚w��。但是由于算法和设计模式的优化是通用的，对Java有效的优化算法和设计模式�Q�对其他�~�译语言也基本适用�Q�因此不能从�Ҏ(gu��)��上改变Java�E�序与编译型语言在执行效率方面的差异�?/font>
		</p>
		<p>
				<br />
				<font size="2"> (t��ng) (t��ng) (t��ng) 另外�Q�JIT(Just In Time�Q�及(qi��ng)时编�?技术也是一个比较好的思想。它的基本原理是�Q�首先，通过Java�~�译器把Java源代码编译成与��^台无关的二进制字节码。然后，在Java�E�序真正执行之前�Q�系�l�通过JIT�~�译器把Java的字节码�~�译为本地化机器码。最后，�pȝ��执行本地化机器码�Q�不用对字节码进行解释。这样做的优�Ҏ(gu��)���Q�大大提高�(sh��)��(ji��n)Java�E�序的性能�Q�羃短了(ji��n)加蝲�E�序的时��_(d��)��同时�Q�由于编译的�l�果�q�不在程序运行期间保存，因此也节�U�了(ji��n)存储�I�间。缺�Ҏ(gu��)���Q�由于JIT�~�译器对所有的代码都想优化�Q�因此同样也占用�?ji��n)很多时间�?/font>
		</p>
		<p>
				<br />
				<font size="2"> (t��ng) (t��ng) (t��ng) 动态优化技术即提前�~�译为机器码的技�?dynamicopttmization�Q�ahead of time technology)是提高Java性能的另一个尝试。动态优化技术充分利用了(ji��n)Java源码�~�译、字节码�~�译、动态编译和�?r��n)态编译的技术。其输入是Java的源码或字节码。而输出是�l�过高度优化的可执行代码和动态库(WindoW中是�Q�dil文�g�Q�UNIX中是�׃�n�?a.so文�g)。其优点是能大大提高�E�序的性能�Q�缺�Ҏ(gu��)��破坏�?ji��n)Java的可�U�L��性，也对Java的安全带来了(ji��n)一定的隐�?zh��n)��?/font>
		</p>
		<p>
				<font size="2"> (t��ng) (t��ng) (t��ng) (t��ng) 2 </font>
				<font size="2">JNI技�?/font>
				<br />
				<font size="2"> (t��ng) (t��ng) (t��ng) 实际上，有一�U�通常被忽视的技术可以在很大�E�度上解册���个难题，那就是JNI(Java Native Interface�Q�Java本地化方�?。图l是JNI技术实现的一般步骤�?br /></font>
		</p>
		<p align="center">
				<img style="WIDTH: 313px; HEIGHT: 461px" height="461" src="http://www.aygfsteel.com/images/blogjava_net/soft/17148/o_s0.jpg" width="399" />
				<br />
				<br />
				<br />
				<a title="图一" href="/images/blogjava_net/soft/17148/r_s0.jpg" target="_blank">
						<font color="#ff0000">点击查看原图</font>
						<br />
				</a> (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng)<br /><br /> (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng) (t��ng)</p>
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