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java網絡編程-Ajax+servlet實例
編輯:AJAX基礎知識     

    Ajax異步請求,servlet產生隨機數據,Html頁面無刷新顯示。
運行環境:jdk1.5+tomcat 5.5

一、ajaxServlet.java

package com;

import java.io.IOException;

import java.io.PrintWriter;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import java.util.Random;

public class ajaxServlet extends HttpServlet{
private static final String CONTENT_TYPE="text/xml; charset=gb2312"; public void init() throws ServletException{} public void doGet(HttpServletRequest request,HttpServletResponse response) throws ServletException,IOException{ response.setContentType(CONTENT_TYPE); response.setHeader("Cache-Control","no-cache"); response.setHeader("Pragma","no-cache"); response.setDateHeader("Expires",0); PrintWriter out=response.getWriter(); String action=request.getParameter("action"); if(("send").equals(action)){ Random random = new Random();  String AA=Integer.toString(Math.abs(random.nextInt())); String BB=Integer.toString(Math.abs(random.nextInt()));  String CC=Integer.toString(Math.abs(random.nextInt())); String DD=Integer.toString(Math.abs(random.nextInt())); StringBuffer sb=new StringBuffer(); sb.append(AA); sb.append("@@@"); sb.append(BB); sb.append("@@@"); sb.append(CC); sb.append("@@@"); sb.append(DD); out.write(sb.toString()); out.close(); } }}

二、testajax.html
<html>
<head>
<title>AJAX.html</title>
</head>
<script type="text/javascript">

function getResult(){

  var url = "/Tajax/AajaxServlet?action=send";

  if (window.XMLHttpRequest) { 

    req = new XMLHttpRequest(); 

  }else if (window.ActiveXObject){ 

    req = new ActiveXObject("Microsoft.XMLHTTP"); 

  } 

  if(req){ 

     req.open("GET",url, true); 

     req.onreadystatechange = complete; 

     req.send(null); 

  } 

} 

/*分析返回的文本文檔*/

function complete(){

  if (req.readyState == 4) { 

    if (req.status == 200) { 

      // alert(req.responseText); 

      var strResult = unescape(req.responseText);

      var arrResult = strResult.split("@@@");

      RemoveRow();  //刪除以前的數據.

      num1 = arrResult[0]; //字段num1的值

      num2 = arrResult[1]; //字段num2的值

      num3 = arrResult[2];

      num4 = arrResult[3];

      row1= tb.insertRow();

      cell1 = row1.insertCell();

      cell1.innerText = num1;

      cell2 = row1.insertCell();

      cell2.innerText = num2;

      row2= tb.insertRow();

      cell3 = row2.insertCell();

      cell3.innerText = num3;

      cell4 = row2.insertCell();

      cell4.innerText = num4;

    } else { 

      alert('There was a problem with the request.'); 

    } 

  } 

} 

 function RemoveR

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