1)UnabletoreadTLD"META-INF/c.tld"fromJAR
DeleteServlet.jarandjsp.jarfromWEB-INF/lib.
2)AntTips:
a)<classpath>
<pathelementpath="${classpath}"/>
<pathelementlocation="lib/helper.jar"/>
</classpath>
b)<classpath>
<
pathelementpath="${classpath}"/
>
方式
?/span>
Q引用特定的变量
<
filesetdir="lib"
>
方式
?/span>
Q指向特定的文g?/span>
<includename="**/*.jar"/>
</fileset>
<
pathelementlocation="classes"/
>
方式
?/span>
Q指向单个目?/span>
<
dirsetdir="${build.dir}"
>
方式
?/span>
Q指向特定目录集
<includename="apps/**/classes"/>
<excludename="apps/**/*Test*"/>
</dirset>
<
filelistrefid="third-party_jars"/
>
方式
?/span>
Q引用指定文件列?/span>
</classpath>
c) <copy todir="${web.inf.classes}">
<fileset dir="src/resources">
<include name="**/spring/*.xml" />
<include name="**/xfire/*.xml" />
</fileset>
<fileset dir="src/main">
<include name="**/*.xml" />
</fileset>
</copy>
3)Failed to setup clustering", what does it mean?
[JBossCacheService][main] jboss.cache:service=TomcatClusteringCache service to Tomcat clustering not found
[JBossCacheManager][main] JBossCacheService to Tomcat clustering not found
[TomcatDeployer][main] Failed to setup clustering, clustering disabled
There's two possibilities here:
1) Since 3.2.6, HTTP session replication is based on JBossCache, and more precisely the TomcatClusteringCache service.In 3.2.6, 3.2.7, 4.0.1 and 4.0.1SP1, the dependency on this service is missing in Tomcat's jboss-service.xml. To fix it, please edit /all/deploy/jbossweb-tomcat5x.sar/META-INF/jboss-service.xml and enable the <depends optional-attribute-name="CacheName?"> element, update the MBean ObjectName as well as the <depends> element itself.
The resulting code should look as follows:
<!--
Configuration for HTTP Session Clustering using JBossCache
-->
<depends>jboss.cache:service=TomcatClusteringCache</depends>
instead of
<!--
Configuration for HTTP Session Clustering using JBossCache
-->
<!--
<depends optional-attribute-name="CacheName">jboss.cache:service=TreeCache</depends>
-->
2) This error could also come up if you're trying to remove the clustering capabilities from the all configuration as explained in JBossASTuningSliming. Even though you might have modified jbossweb-tomcat5x.sar/META-INF/jboss-service.xml to remove the dependency on
jboss.cache:service=TomcatClusteringCache
, if the web application is deployed as
<distributable/>
, AS will try starting up
jboss.cache:service=TomcatClusteringCache
, for HTTP session replication. In this case, the ERROR message should not be considered as a failure because if it can't start it up, it'll log the ERROR but will continue working as normal.
4) 一ơ性导出所有oracle sequence
select 'create sequence ABEL.'|| SEQUENCE_NAME || ' minvalue '||MIN_VALUE||' maxvalue '||MAX_VALUE||' start with '||LAST_NUMBER||' increment by '||INCREMENT_BY||' cache '||CACHE_SIZE||' ;' from dba_sequences where SEQUENCE_OWNER = 'TEEMA'
5) Ora-01033: Oracle initialization or shutdown in process.
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(SID_NAME = PLSExtProc)
(ORACLE_HOME = D:\Database\oracle\product\10.1.0\Db_1)
(PROGRAM = extproc)
)
#(SID_DESC =
# (GLOBAL_DBNAME = Abel)
# (ORACLE_HOME = D:\Database\oracle\product\10.1.0\Db_1)
# (SID_NAME = Abel)
#)
)
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Avalon原意?凯尔Ҏ传说中的西方乐土?据说亚瑟王及光下死后尸体被Ud该岛?BR>Avalon是五个子目的父目QFramework、Excalibur(亚瑟王的剑)、LogKit、Phoenix(长生鸟、凤?、和Cornerstone(墙角?。Avalon把重Ҏ在服务器端编E和让以服务器应用ؓ中心的项目的设计和维护变得更Ҏ。Avalon可被描述Z个包含了实现的框架?/P>
Framework
Avalon Framework是Avalon大伞下的所有其它项目的基础。它定义了接口、契U（contractsQ和Avalon的缺省实现。Framework大部分工作|于其中Q因此也是最为成熟的目?BR> 框架q个词在应用E序中的含义很广泛。重Ҏ在单一行业的框架被UCؓ垂直市场框架Q例如医药系l或通信pȝ。原因是同样的框架不能胜d它行业。具有很好通用性，可用于多个行业的框架被称为水q_场框架。Avalon是一个水q_场框架。您可以使用Avalon的Framework构徏垂直市场框架?BR> 用Avalon构徏的最有说服力的垂直市场框架的例子是Apache Cocoon出版框架。Apache CocoonW?版是使用Avalon的Framework、Excalibur和LogKit目构徏的。它利用了Framework中的接口和契U，让开发者能用更的旉理解Cocoon是如何工作的。它也有效地利用了Excalibur提供的数据源理和组件管理代码，q样它就不必重新发明轮子了。最后，它用了LogKit来处理出版框架中所有的日志问题?/P>
Excalibur
Avalon Excalibur是一l服务器端组Ӟ您可以在自己的项目中使用它们。它包括了池QpoolingQ的实现、数据库q接理和其它一些组件管理的实现?BR>
LogKit
Avalon LogKit是一个高速日志记录工具集QFramework、Excalibur、Cornerstone和Phoenix都用到它。它的模型与JDK 1.4 Logging package采用相同的原理，但与JDK 1.2+兼容?/P>
Phoenix
Avalon Phoenix是服务器核心Q它理服务QServiceQ实Cؓ服务器端lgQ称作BlockQ的发布和执行。主要采用了SOP思想[面向服务的编E（Service Oriented Programming QSOPQ的思想是把pȝ划分为由pȝ提供的一些服务]。Phoenix把每一U要提供的设施看作是一Ҏ务，q定接口和相关契约l成。服务的实现被称为Block。一个服务器E序是由多种服务l成的，认识q一点很重要?BR>
Cornerstone
Avalon Cornerstone是一lBlock或服务，q些Block可以布v在Phoenix环境中。这些Block包括了socket理和Block之间的Q务调度?BR>
Scratchpad
Scratchpadq不是一个真正的正式目Q而是那些q没准备好放入Excalibur中的lg的一个时区域。这些组件品质差别较大，它们的API也不保证会不变，直到它们被提升到Excalibur目为止?BR>
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一?开发环?
我的开发环境是QJBuilder x + Weblogic 8.1 + Oracle 9i + Windows 2003 Q如果朋友们的开发环境不一样亦无妨?
二、开发思\
既然讲的是StrutsQ那自然M了MVCQ分|CZ是如此?
1?建立数据库和对应的表Q本例的表是TCertificate?
2?建立适当的模型组Ӟ对应你要查询数据库中的表。这部分由DAO数据讉K层来实现Q如果有的朋友对DAO不熟悉可以查询一下相兌料。本例由CertificateDAO.java来实现?
3 、徏立分|需要的模型lgQ由javaBean来充当，q与CertificateDAO实现分离。网上介l的很多ҎQ都存在着数据与分늻件藕合的现象Q这也是本方法与其它分页Ҏ的主要不同之处?
4、徏立控制器lgQ这部分由Struts 中的Action来实现。主要负责将实例化CertificateDAOQ只取要昄的数据记录，存入ArrayList对象然后q回Qƈ攑ֈrequest中。而分部分则Ҏ分页条gQ单独进行构造，避免了与DAO混在一L情况发生。网上其它介l的一些分|法中Q基本上都是一ơ性读出所有查询的数据Q然后再由分늛关组件进行构造。这P如果数据量大的话Q很Ҏ形成瓉。在本例中由于不是一ơ性地d查询的所有数据，而只是读Z个页面要昄的数据记录，q就节省了很多不必要的数据传输，提高了效率。本例中为CertificateAction.java?
5、徏立视囄Ӟq部分由jsp来充当，Z不出现java 代码Q我们用Struts提供的标{ֺQ主要负责从request中取出刚刚放入的对象Q通过反复调用CertificateAction以及action参数Q而实现分|C。本例中为listcertificate.jsp?
6?建立q|struts-config.xml?
三、实例代?
定好上面的开发思\后，代码的实现就有单可@了?
1、徏数据库和相应的表?
2、数据逻辑层的相关代码?
1Q、通用的DAOc：CommonDAO.java
q是一个很多DAO都要l承到的通用DAOc，是我Ҏ实践ȝ出来的，Z减少幅Q这里只昄和本例相关的代码?
| java代码: |
|
package com.xindeco.business ; import java.io.*; import java.sql.*; import java.util.*; import javax.sql.*; import java.lang.IllegalAccessException; import java.lang.reflect.InvocationTargetException; import org.apache.commons.beanutils.BeanUtils; public class DAO { protected DataSource ds; /** * 说明:取得当前查询的总记录数 */ public int getRows () { return this.count; } public void rsHandler (ResultSet rs, int offset, int limit) { try { count = 0; rs.absolute ( -1) ; count = rs.getRow () ; if (offset <= 0) { rs.beforeFirst () ; } else { rs.absolute (offset) ; } } catch (Exception e) { e.printStackTrace () ; } } public DAO(DataSource ds) { this.ds = ds; } public void setDataSource(DataSource ds) { this.ds = ds; } protected void close(ResultSet rs) { if (rs != null) { try { rs.close(); } catch (SQLException e) { } rs = null; } } protected void close(PreparedStatement pstmt) { if (pstmt != null) { try { pstmt.close(); } catch (SQLException e) { } pstmt = null; } } protected void close(Connection conn) { if (conn != null) { try { conn.close(); } catch (SQLException e) { e.printStackTrace(); } conn = null; } } protected void rollback(Connection conn) { if (conn != null) { try { conn.rollback(); } catch (SQLException e) { e.printStackTrace(); } conn = null; } } } |
q个cM要是通过子类传进来的先进l果集，取得查询的记录LQƈҎ据库q接q行单的理?
2Q、对数据库进行访问：CertificateDAO.java
| java代码: |
|
package com.xindeco.business; import java.io.*; import java.sql.*; import java.util.*; import javax.sql.*; import com.xindeco.common.dbconn.DbConn; public class CertificateDAO extends DAO { public NationDAO(DataSource ds) { super(ds); } public List findCertificateList(int offset,int limit) throws SQLException { int countRows = 0 ; ArrayList list = null ; Connection conn = null; PreparedStatement pstmt = null; ResultSet rs = null; try { conn = ds.getConnection(); String sql = "SELECT certificateID, certificateCode,certificateName,photoURL," + "description,graduateID FROM TCertificate " ; pstmt = conn.prepareStatement(sql); rs = pstmt.executeQuery(); /*Ҏ标进行处理，rsHandler Ҏ在父cDAO?/ this.rsHandler(rs,offset,limit); if (rs != null && rs.next ()) { list = new ArrayList () ; do { countRows++ ; list.add (rs2VO (rs)) ; } while ( (countRows++ < limit) && rs.next ()) ; } close(rs); close(pstmt); } catch (SQLException e) { close(rs); close(pstmt); rollback(conn); e.printStackTrace(); } finally { close(conn); } return list ; } private CertificateVO rs2VO (ResultSet rs) { try { CertificateVO certificateVO = new CertificateVO () ; certificateVO.setCertificateID (rs.getInt ("certificateID")) ; certificateVO.setCertificateCode (rs.getString ("certificateCode")) ; certificateVO.setCertificateName (rs.getString ("certificateName")) ; certificateVO.setPhotoURL (rs.getString ("photoURL")) ; certificateVO.setDescription (rs.getString ("description")) ; certificateVO.setGraduateID (rs.getInt ("graduateID")) ; return certificateVO ; } catch (Exception ex) { ex.printStackTrace () ; return null ; } } } |
findCertificateList(int offset,int limit)是查得所有要昄的数据，q放入ArrayList中。看q网上有些例子，把数据记录放入ArrayList的动作过E直接在while循环体里完成Q如果字D多的话Q会造成Ҏq于宠大Q又不美观?q里Q数据记录放入ArrayList的动作过E由rs2VOҎ完成Q就比较整洁了。另外，if (rs != null && rs.next ()) 配合while ( (countRows++ < limit) && rs.next ()) 是ؓ了程序的健壮性考虑的，E分析一下不隑־出结论?
3、徏立控制器lgQCertificateAction.java
| java代码: |
|
package com.xindeco.presentation; import javax.sql.* ; import java.util.* ; import javax.servlet.http.* ; import javax.servlet.* ; import org.apache.struts.action.* ; import org.apache.struts.util.* ; import com.xindeco.common.Pager; import com.xindeco.business.graduatedata.CertificateDAO ; public class CertificateAction extends Action { private static final int PAGE_LENGTH = 5 ; //每页昄5条记? public ActionForward execute (ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) { ActionForward myforward = null ; String myaction = mapping.getParameter () ; if (isCancelled (request)) { return mapping.findForward ("failure") ; } if ("".equalsIgnoreCase (myaction)) { myforward = mapping.findForward ("failure") ; } else if ("LIST".equalsIgnoreCase (myaction)) { myforward = performList (mapping, form, request, response) ; } else { myforward = mapping.findForward ("failure") ; } return myforward ; } private ActionForward performList (ActionMapping mapping, ActionForm actionForm, HttpServletRequest request, HttpServletResponse response) { try { DataSource ds = (DataSource) servlet.getServletContext().getAttribute(Action.DATA_SOURCE_KEY); CertificateDAO certificateDAO = new CertificateDAO (ds) ; int offset = 0; //页时的起始记录所在游? int length = PAGE_LENGTH; String pageOffset = request.getParameter("pager.offset"); if (pageOffset == null || pageOffset.equals("")) { offset = 0; } else { offset = Integer.parseInt(pageOffset); } List certificateList = certificateDAO .findCertificateList (offset,length) ; int size = certificateDAO.getRows(); // 取得总记录数 String url = request.getContextPath()+"/"+mapping.getPath()+".do"; String pagerHeader = Pager.generate(offset, size, length, url); //分页处理 request.setAttribute ("pager", pagerHeader) ; request.setAttribute ("list", certificateList) ; } catch (Exception e) { e.printStackTrace(); return mapping.findForward ("error") ; } return mapping.findForward ("success") ; } } |
CertificateAction.java主要是把数据从DAO中取出，q放入一个ArrayList 中，然后通过配置文g再Y件View的JSPc?
5、徏立视图listcertificate.jsp文g?
| java代码: |
|
<%@ page contentType="text/html; charset=GBK" %> <%@ taglib uri="/WEB-INF/struts-template.tld" prefix="template" %> <%@ taglib uri="/WEB-INF/struts-html.tld" prefix="html" %> <%@ taglib uri="/WEB-INF/struts-bean.tld" prefix="bean" %> <%@ taglib uri="/WEB-INF/struts-logic.tld" prefix="logic" %> <table bgcolor="#666666" cellpadding="1" cellspacing="0" border="0" width="500"> <tr> <td> <table cellpadding="0" cellspacing="0" border="0" width="500"> <tr> <td bgcolor="#fecc51">&</td> </tr> </table> </td> </tr> <tr> <td> <table cellpadding="0" cellspacing="0" border="0" width="500"> <tr> <td bgcolor="#d6e0ed"> &&<bean:message key="label.list4certificate"/> </td> </tr> <tr bgcolor="#FFFFFF"> <td width="5%"></td><td width="19%"></td><td width="76%"></td> </tr> <tr> <td> <table bgcolor="#f2f2f2" width="500" cellspacing="0" border="0"> <tr bgcolor="#bacce1"> <td><b><bean:message key="Certificate.select"/> </b></td> <td><b><bean:message key="Certificate.certificateID"/> </b></td> <td><b><bean:message key="Certificate.certificateCode"/></b></td> <td><b><bean:message key="Certificate.certificateName"/></b></td> <td><b><bean:message key="Certificate.view"/></b></td> ?/tr> <bean:write name="pager" property="description"/> <logic:equal name="pager" property="hasPrevious" value="true"> <a href="/graduatedata/list.do?viewPage=<bean:write name="pager" property="previousPage"/>" class="a02"> Previous </a> </logic:equal> <logic:equal name="pager" property="hasNext" value="true"> ?a href="/graduatedata/list.do?viewPage=<bean:write name="pager" property="nextPage"/>" class="a02"> Next ?/a> </logic:equal> <logic:notEmpty name="list" scope="request"> <logic:iterate id="certificate" name="list" type="com.xindeco.business.graduatedata.CertificateVO"scope="request"> <tr bgcolor="#FFFFFF"> ?td><html:text property="name" value="<bean:write name="certificate" property="certificateID" scope="page"/>"/> </td> ?td> <bean:write name="certificate" property="certificateID" scope="page"/></td> ?td> <bean:write name="certificate" property="certificateCode" scope="page"/></td> ?td> <bean:write name="certificate" property="certificateName" scope="page"/></td> ?td> <bean:write name="certificate" property="photoURL" scope="page"/></td> </tr> </logic:iterate> </logic:notEmpty> </table> </td> </tr> </table> </td> </tr> </table> |
6、对应的配置文gstruts-config.xml?
| java代码: |
|
<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE struts-config PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 1.1//EN" "http://jakarta.apache.org/struts/dtds/struts-config_1_1.dtd"> <struts-config> <form-beans> <form-bean name="certificateForm" type="com.xindeco.presentation.graduatedata.CertificateForm" /> </form-beans> <global-forwards> <forward name="error" path="/error/error.jsp" /> </global-forwards> <action-mappings> <action name="certificateForm" parameter="LIST" path="/graduatedata/list" scope="request" type="com.xindeco.presentation.graduatedata.CertificateAction" validate="true"> <forward name="success" path="/graduatedata/listcertificate.jsp" /> </action> </action-mappings> …? </struts-config> |
7、最后当然是最重要的分代码了QPager.java
| java代码: |
|
package com.xindeco.common; import java.util.* ; public class Pager { private static int MAX_PAGE_INDEX = 10; //脚昄多少? private static String HEADER = "Result page"; public static String generate(int offset, int length, int size, String url) { if (length > size) { String pref; if (url.indexOf("?") > -1) { pref = "&"; } else { pref = "?"; } String header = "<font face='Helvetica' size='-1'>"+HEADER+": "; if (offset > 0) { header += "&<a href=\""+url+pref+"pager.offset="+(offset-size)+"\">[<< Prev]</a>\n"; } int start; int radius = MAX_PAGE_INDEX/2*size; if (offset < radius) { start = 0; } else if(offset < length-radius) { start = offset - radius; } else { start = (length/size-MAX_PAGE_INDEX)*size; } for(int i=start;i<length && i < start + MAX_PAGE_INDEX*size;i+=size) { if (i == offset) { header += "<b>"+(i/size+1)+"</b>\n"; } else { header += "&<a href=\""+url+pref+"pager.offset="+i+"\">"+(i/size+1)+"</a>\n"; } } if(offset < length - size) { header += "&<a href=\""+url+pref+"pager.offset="+((int)offset+(int)size)+"\">[Next >>]</a>\n"; } header += "</font>"; return header; } else { return ""; } } } |
q部分代码的实现相当z，但已l够完成所需了?/P>
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