BlogJava-liuzheng-文章分类-Strutshttp://www.blogjava.net/liuzheng/category/24700.htmlzh-cnThu, 06 Sep 2007 17:42:04 GMTThu, 06 Sep 2007 17:42:04 GMT60Struts核心类理解http://www.blogjava.net/liuzheng/articles/142858.html刘铮 刘铮 Wed, 05 Sep 2007 04:01:00 GMThttp://www.blogjava.net/liuzheng/articles/142858.htmlhttp://www.blogjava.net/liuzheng/comments/142858.htmlhttp://www.blogjava.net/liuzheng/articles/142858.html#Feedback0http://www.blogjava.net/liuzheng/comments/commentRss/142858.htmlhttp://www.blogjava.net/liuzheng/services/trackbacks/142858.htmlStruts核心类： ActionServlet,RequestProcessor

1.       ActionServlet负责Struts架构的整个初始化工作，当ActionServlet实例接受到HTTP请求时，在doGet()和doPost()方法中都会调用process()方法，Process()中又会调用RequestProcessor的process()方法。

2.       RequestProcessor中的processActionPerform()调用action的execute()方法。RequestProcessor可以根据需要进行扩展，如Spring中的org.springframework.web.struts.DelegatingRequestProcessor。扩展后必须在Struts的Config中加入<controller processorClass=

"ＸＸＸＸＸＸ"/>



刘铮 2007-09-05 12:01 发表评论
]]>基于Struts的AJAX http://www.blogjava.net/liuzheng/articles/136445.html刘铮 刘铮 Mon, 13 Aug 2007 09:24:00 GMThttp://www.blogjava.net/liuzheng/articles/136445.htmlhttp://www.blogjava.net/liuzheng/comments/136445.htmlhttp://www.blogjava.net/liuzheng/articles/136445.html#Feedback0http://www.blogjava.net/liuzheng/comments/commentRss/136445.htmlhttp://www.blogjava.net/liuzheng/services/trackbacks/136445.html首先，我们仍然是对Struts应用来做配置，仍然是在struts-config,xml文件里做配置，如下：

 <action type="com.ajax.CheckAction"
   　　scope="request" path="/ajax/check">
   　　<forward name="success" path="/check.jsp"/>
 </action>


跟普通的Struts应用的配置一样，只是没有ActionForm的配置。下面是Action类：

 package com.ajax;
 
 import java.io.PrintWriter;
 
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 
 import org.apache.struts.action.Action;
 import org.apache.struts.action.ActionForm;
 import org.apache.struts.action.ActionForward;
 import org.apache.struts.action.ActionMapping;
 import org.apache.struts.action.DynaActionForm;
 
 /**
  * @author Administrator
  *
  * TODO To change the template for this generated type comment go to
  * Window - Preferences - Java - Code Style - Code Templates
  */
 public class CheckAction extends Action
 {
  public final ActionForward execute(ActionMapping mapping, ActionForm form,
         　　HttpServletRequest request,
         　　HttpServletResponse response)
   throws Exception
   {
　　System.out.println("haha...............................");
　　String username= request.getParameter("username");
　　System.out.println(username);
　　String retn;
　　if("educhina".equals(username)) retn = "Can't use the same name with the old use,pls select a difference...";
　　else retn = "congraducation!you can use this name....";
　　PrintWriter out=response.getWriter();
         　　out.write(retn);
         　　out.close();
　　return mapping.findForward("success");
   }
  public static void main(String[] args)
  {
  }
 }

我们可以看到里面的逻辑跟上例中Servlet里的逻辑一样。最后，我们来看看JSP:

 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
 <html>
 <head>
 <title>Check.html</title>
 
 <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
 <meta http-equiv="description" content="this is my page">
 
 <!--<link rel="stylesheet" type="text/css" href="./styles.css">-->
 
 </head>
 <script type="text/javascript">
  var http_request = false;
  function send_request(url) {//初始化、指定处理函数、发送请求的函数
   http_request = false;
   file://开始初始化XMLHttpRequest对象
   if(window.XMLHttpRequest) { file://Mozilla 浏览器
　　http_request = new XMLHttpRequest();
　　if (http_request.overrideMimeType) {//设置MiME类别
 　　http_request.overrideMimeType('text/xml');
　　}
   }
   else if (window.ActiveXObject) { // IE浏览器
　　try {
 　　http_request = new ActiveXObject("Msxml2.XMLHTTP");
　　} catch (e) {
 　　try {
  　　http_request = new ActiveXObject("Microsoft.XMLHTTP");
 　　} catch (e) {}
　　}
   }
   if (!http_request) { // 异常，创建对象实例失败
　　window.alert("不能创建XMLHttpRequest对象实例.");
　　return false;
   }
   http_request.onreadystatechange = processRequest;
   // 确定发送请求的方式和URL以及是否同步执行下段代码
   http_request.open("GET", url, true);
   http_request.send(null);
  }
  // 处理返回信息的函数
 　　function processRequest() {
     　　if (http_request.readyState == 4) { // 判断对象状态
         　　if (http_request.status == 200) { // 信息已经成功返回，开始处理信息
             　　alert(http_request.responseText);
         　　} else { file://页面不正常
             　　alert("您所请求的页面有异常。");
         　　}
     　　}
 　　}
  function userCheck() {
   var f = document.forms[0];
   var username = f.username.value;
   if(username=="") {
　　window.alert("The user name can not be null!");
　　f.username.focus();
　　return false;
   }
   else {
　　send_request('ajax/check.do?username='+username);
   }
  }
 
 </script>
 <body>
  <form name="form1" action="" method="post">
 User Name:<input type="text" name="username" value="">&nbsp;
 <input type="button" name="check" value="check" onClick="userCheck()">
 <input type="submit" name="submit" value="/oblog312/submit">
 </form>
 </body>
 </html>

我们可以看到，JSP基本是一样的，除了要发送的url：ajax/check.do?username="+username。 



刘铮 2007-08-13 17:24 发表评论
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