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http学习�W�记

2195113 — Thu, 28 Sep 2006 07:53:00 GMT

一.HTTP��h��:
HTTP��h��分�ؓ:
1).��h��?br /> 2).消息�?br /> 3).�I��
4).正文

1.��h��?br /> [�Ҏ�� URI HTTP版本信息]
�? GET /index.htm HTTP/1.0

2.�Ҏ��(全部大写):
GET      ��h��URI标识的资�?br /> HEAD     ��h��获取响应消息�?br /> PUT      ��h��存储资源,�q�用URI作�ؓ其标�?br /> POST     ��h��服务器接收信�?br /> CONNECT ?
TRACE
DELETE
OPTIONS

�?HTTP响应:
1).状态行
2).消息�?br /> 3).�I��
4).正文(资源的内�?比如index.htm文�g的文本内�?

1.状态行
HTTP版本信息状态码响应码描�q?br /> �? HTTP/1.1 200 OK

2.状态码(�W�一位表�C�响应的�c�d��)
1xx:
2xx:
3xx:
4xx:
5xx:
HTTP协议状态码具体意义
   100 : Continue
   101 : witchingProtocols
   200 : OK
   201 : Created
   202 : Accepted
   203 : Non-AuthoritativeInformation
   204 : NoContent
   205 : ResetContent
   206 : PartialContent
   300 : MultipleChoices
   301 : MovedPermanently
   302 : Found
   303 : SeeOther
   304 : NotModified
   305 : UseProxy
   307 : TemporaryRedirect
   400 : BadRequest
   401 : Unauthorized
   402 : PaymentRequired
   403 : Forbidden
   404 : NotFound
   405 : MethodNotAllowed
   406 : NotAcceptable
   407 : ProxyAuthenticationRequired
   408 : RequestTime-out
   409 : Conflict
   410 : Gone
   411 : LengthRequired
   412 : PreconditionFailed
   413 : RequestEntityTooLarge
   414 : Request-URITooLarge
   415 : UnsupportedMediaType
   416 : Requestedrangenotsatisfiable
   417 : ExpectationFailed
   500 : InternalServerError
   501 : NotImplemented
   502 : BadGateway
   503 : ServiceUnavailable
   504 : GatewayTime-out
   505 : HTTPVersionnotsupported

�?HTTP消息�?
1. 普�?br />2. ��h��?br />3. 响应�?br />4. 实体�?br />
格式:(名字大小写无�?
<名字>:<�I�格><�?gt;

1.普通头
.Cache-Control (HTTP1.1, HTTP1.0:Pragma)
      �~�存指��o:
      ��h��? no-cache,no-store,max-age,max-stale,min-fresh,only-if-cached
      响应�? public,private,no-cache,no-store,no-transform,must-revalidate,proxy-revalidate,max-age,s-maxage.
      �? Cache-Control: no-cache
.Date
      客户�?在发送正文时要包含Date,
      服务�?在响应时包含Date.
.Connection
.Pragma(1.0�?

2. ��h��?br /> .Accept
.Accept-Charset
.Accept-Encoding
.Accept-Language
.Authorization
.Host(必须�?
.User-agent

3.响应�?br /> .Location
.Server
.WWW-Authenticate,要包含在401�?

4.实体�?br /> .Content-Encoding
.Content-Language
.Content-Length
.Content-Type
.Last-Modified
.Expires

2195113 2006-09-28 15:53 发表评论

2195113 — Mon, 25 Sep 2006 08:18:00 GMT

1.�U�程中要使用的类.各线�E�只有其一个引�?

public class VarClass {

    private static ThreadLocal threadVar=new ThreadLocal(){
        protected synchronized Object initialValue(){
            System.out.println(Thread.currentThread().getName()+" initial value is 1");
            return new Integer(1);
        }};

    public int getValue(){
        return ((Integer)threadVar.get()).intValue();
    }

    public void setValue(){
        int a=getValue();
        a++;
        threadVar.set(new Integer(a));
    }
}

2.�U�程�c?br />
public class Worker extends Thread {
    private long interval=0;
    private boolean isRun=true;
    private VarClass v=null;

    public Worker(String name,VarClass v,long interval){
        setName(name);
        this.v=v;
        this.interval=interval;
    }

    public void run() {
        while(isRun){
            try{
                Thread.sleep(interval);
            }catch(InterruptedException e){
                e.printStackTrace();
            }
            v.setValue();
        }
        System.out.println(getName()+" is over at "+v.getValue());
    }

    public void stopThread(){
        isRun=false;
    }
}

3.��试�c?br />public class TestThreadLocal {
   public static void main(String[] args){
       VarClass v=new VarClass();

       Worker w1=new Worker("Thread_A",v,100);
       Worker w2=new Worker("Thread_B",v,200);
       Worker w3=new Worker("Thread_C",v,300);
       Worker w4=new Worker("Thread_D",v,400);
       Worker w5=new Worker("Thread_E",v,500);

       w1.start();
       w2.start();
       w3.start();
       w4.start();
       w5.start();

       System.out.println("All threads is over after 20 seconds");

       //延时20�U�后,�l�止5个线�E?br />       try{
           Thread.sleep(20000);
       }catch(InterruptedException e){
           e.printStackTrace();
       }

       System.out.println("All threads will be overed");
       w1.stopThread();
       w2.stopThread();
       w3.stopThread();
       w4.stopThread();
       w5.stopThread();
}
}

4.��试�l�果:
All threads is over after 20 seconds
Thread_A initial value is 1
Thread_B initial value is 1
Thread_C initial value is 1
Thread_D initial value is 1
Thread_E initial value is 1
All threads will be overed
Thread_A is over at 200
Thread_B is over at 101
Thread_D is over at 51
Thread_C is over at 68
Thread_E is over at 42

5.�l�果说明:虽然各线�E��用的是同一个对象的引用,但由于��用了ThreadLocal,实际上每个线�E�所操作的数据是不一��L��.

2195113 2006-09-25 16:18 发表评论

proxool�q�接池的配置

2195113 — Thu, 03 Aug 2006 06:03:00 GMT

proxool�q�接池的配置(0.8.3)

1. 配置文�g(xml形式,文�g名�Q�?
--------------------------------

mypool

jdbc:oracle:thin:@localhost:1521:oradb

oracle.jdbc.driver.OracleDriver

select CURRENT_DATE

2.web.xml配置
--------------

ServletConfigurator

org.logicalcobwebs.proxool.configuration.ServletConfigurator

xmlFile

WEB-INF/proxool.xml

Admin

org.logicalcobwebs.proxool.admin.servlet.AdminServlet

Admin

/admin

3. �E�序调用
Connection conn=null;
try {
    Class.forName("org.logicalcobwebs.proxool.ProxoolDriver");
    conn = DriverManager.getConnection("proxool.mypool"); //add "proxool" before "mypool" in proxool.xml
}catch(ClassNotFountException e){
    e.printStackTrace();
}catch(SQLException e) {
    e.printStackTrace();
}

2195113 2006-08-03 14:03 发表评论

�U�程同步随记

2195113 — Tue, 25 Jul 2006 06:53:00 GMT

1. wait:
   Causes current thread to wait until either another thread invokes the notify() method or the notifyAll() method for this object
   This method should only be called by a thread that is the owner of this object's monitor

   使当前线�E�放弃对象锁(�{�待?)�Q�直到其它线�E��ؓ该对象调用notify()或notifyAll().
   �q�个�Ҏ��只能被拥有对象锁�Q�监听器?)的线�E�执行�?br />

2. notify,notifyAll
   Wakes up a or all threads that are waiting on this object's monitor.

   唤醒正在�{�待指定对象的锁的一个或所有线�E��?br />
-- �q�样��译也不知是否准��?括号内是按直译过来的意思�?br />
3. 四种方式
   1.static synchronized method(){}
   2.sychronized(Class)
   3.sychronized method(){}
   4.sychronized() {}

4. 书上没说�q�的�Q?Spin Lock (旋�{�?

2195113 2006-07-25 14:53 发表评论

2195113 — Wed, 19 Jul 2006 08:47:00 GMT

本例以租房子��Z��Q?br />一.说明:
   动态代理可动态�ؓ某个�c�L��加代�?以拦截客��L��的调�?在此基础上进行额外的处理.
   目前较流行的AOP技�?��有以动态代理�ؓ技术基��q�行实现�?

   本例�?中介作�ؓ房子的动态代�?所有调用房子的�Ҏ��,必须�l�过中介�c?HouseAgency).

�?源代�?
   1.House接口:

public interface House {
    public void rent();
    public int getPrice();
}

   2.House接口实现�c�ConcreateHouse:

public class ConcreteHouse implements House{
    private int price;

    public ConcreteHouse(int price){
        this.price=price;
    }

    public void rent(){
        System.out.println("rent ok!");
    }

    public int getPrice(){
        return price;
    }
}

   3.实现InvocationHandler接口的中介类:

import java.lang.reflect.*;

public class HouseAgency implements InvocationHandler {
    private Object house;

    public HouseAgency(Object house){
        this.house=house;
    }

    public HouseAgency(){}

    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {

        Object result=null;
        if("getPrice".equals(method.getName())){
            System.out.println("invoking getPrice() to query rent price.");
        }
        if("rent".equals(method.getName())){
            System.out.println("invoking rent() to rent the house.");
        }
        result=method.invoke(house,args);
        return result;
    }
}

   4.客户�?

import java.lang.reflect.*;

public class HouseClient{

    public static void main(String[] args){
        ConcreteHouse house1=new ConcreteHouse(400);
        HouseAgency ha=new HouseAgency(house1);
        House house=(House)Proxy.newProxyInstance(house1.getClass().getClassLoader(),
                                                  house1.getClass().getInterfaces(),ha);

        int price=house.getPrice();

        System.out.println("the house rent is : "+price);

        if(price>300){
            house.rent();
        }
    }
}

�?打印�l�果
invoking getPrice() to query rent price.
the house rent is : 400
invoking rent() to rent the house.
rent ok!

2195113 2006-07-19 16:47 发表评论

2195113 — Fri, 14 Jul 2006 05:20:00 GMT

JDOM(1.0)的初�ơ接�?br />
一.源代码：

import org.jdom.Element;                 //代表元素
import org.jdom.Attribute;               //代表元素的属�?br />import org.jdom.Document;                //代表整个XML文档
import org.jdom.Comment;                 //注释
import org.jdom.output.XMLOutputter;     //输出
import org.jdom.output.Format;           //输出的格�?br />import java.io.FileWriter;               //  :)

public class JDomTest {

	public static void main(String[] args) throws Exception{

		Element root=new Element("人员信息");
		Document document=new Document(root);    //建立新XML文档�Q��ƈ以根元素初始�?br />
		root.addContent(new Comment("新进公司职员")); //建立新元素，�q�将新元素作为根元素的内�?
		root.setAttribute(new Attribute("单位","XXXX软�g公司"));
		root.addContent(new Element("姓名").addContent("XYZ"));
		root.addContent(new Element("�q�龄").addContent("23")
		                                   .setAttribute("体�Ş","适中"));
		root.addContent(new Element("性别").addContent("�?));
		root.addContent(new Element("�w�高").addContent("green"));
		root.addContent(new Element("体重").addContent("75KG"));


		//output
		Format format=Format.getPrettyFormat(); //静态方法，产生两个�I�格的羃�q�格�?br />		format.setIndent("    ");               //变成四个�I�格的羃�q�格�?用四个空格字�W�作参数
		format.setEncoding("gb2312");           //讄����~�码格式

		XMLOutputter out=new XMLOutputter(format);  
		out.output(document,System.out);	//输出到控制台

		FileWriter writer=new FileWriter("./jdomtest.xml");
		out.output(document,writer);            //输出到文�?br />	}
}


�?说明�Q?br />以上代码�Ҏ���|�上文章所写，��M��感觉JDOM使用��h���Q�比SAX�Q�DOM要顺手的多（仅�ؓ个�h观点�Q��?br />
�?�E�序输出


<人员信息 单位="XXXX软�g公司">
    
    <姓名>XYZ
    <�q�龄 体�Ş="适中">23
    <性别>�?lt;/性别>
    <�w�高>green
    <体重>75KG

2195113 2006-07-14 13:20 发表评论