Ajax局部重新整理應用案例

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Ajax局部重新整理應用案例

 Ajax局部重新整理在之前的文章中也有介紹過,下面以一個登入的例子為大家介紹下其具體的使用

二話不說了,直接給代碼,相信需要的都是代碼而不是廢話一堆…… 

1.java代碼: 

 代碼如下:

package tt; 

 

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; 

 

public class TestA extends HttpServlet { 

 

private static final long serialVersionUID = -7999241892841130740L; 

 

protected void doGet(HttpServletRequest request, 

HttpServletResponse response) throws ServletException, IOException { 

request.setCharacterEncoding("utf-8"); 

String name = request.getParameter("name"); 

 

response.setContentType("text/xml; charset=utf-8"); 

response.setHeader("Cache-Control", "no-cache"); 

PrintWriter out = response.getWriter(); 

out.println("<pront>"); 

if (name.equals("yangjinde")) { 

out.println("<content>" + "對不起,'yangjinde'此名已經註冊" + "</content>"); 

} else { 

out.println("<content>" + "可以註冊哦" + "</content>"); 

out.println("</pront>"); 

out.close(); 

 

2.jsp代碼: 

代碼如下:

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> 

<% 

String path = request.getContextPath(); 

String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; 

%> 

 

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> 

<html> 

<head> 

<base href="<%=basePath%>"> 

 

<title>My JSP 'index.jsp' starting page</title> 

<meta http-equiv="pragma" content="no-cache"> 

<meta http-equiv="cache-control" content="no-cache"> 

<meta http-equiv="expires" content="0"> 

<meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> 

<meta http-equiv="description" content="This is my page"> 

<script> 

//設一個變數 

var XMLHttpReq=false; 

//建立一個XMLHttpRequest對象 

function createXMLHttpRequest(){ 

if(window.XMLHttpRequest){ //Mozilla 

XMLHttpReq=new XMLHttpRequest(); 

else if(window.ActiveXObject){ 

try{ 

XMLHttpReq=new ActiveXObject("Msxml2.XMLHTTP"); 

}catch(e){ 

try{ 

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

}catch(e){} 

//發送請求函數 

function send(url){ 

createXMLHttpRequest(); 

XMLHttpReq.open("GET",url,true); 

XMLHttpReq.onreadystatechange=proce; //指定響應的函數 

XMLHttpReq.send(null); //發送請求 

function proce(){ 

if(XMLHttpReq.readyState==4){ //對象狀態 

if(XMLHttpReq.status==200){//資訊已成功返回,開始處理資訊 

var res=XMLHttpReq.responseXML.getElementsByTagName("content")[0].firstChild.data; 

window.alert(res); 

document.getElementById("data").innerHTML = res; 

document.getElementById("name").value = res; 

}else{ 

window.alert("不好意思,所請求的頁面有異常"); 

//身分識別驗證 

function check(){ 

var name=document.getElementById("name").value; 

if(name==""){ 

alert("請輸入內容哦"); 

return false; 

else{ 

send('login?name='+name); 

 

</script> 

</head> 

 

<body> 

<form action="login" method="post"> 

<tr><td>姓名: <input id="name" type="text" name="name"/> 

<input type="button" value="點我試試看" onClick="check()"/> 

</td> 

</tr> 

<tr><td><div id="data">等下我會變哦!!</div></td></tr> 

</form> 

</body> 

</html> 

 

3.xml設定檔代碼: 

複製代碼 代碼如下:

<?xml version="1.0" encoding="UTF-8"?> 

<web-app version="2.4" 

xmlns="http://java.sun.com/xml/ns/j2ee" 

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 

xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee 

http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"> 

<servlet> 

<servlet-name>login</servlet-name> 

<servlet-class>tt.TestA</servlet-class> 

</servlet> 

 

<servlet-mapping> 

<servlet-name>login</servlet-name> 

<url-pattern>/login</url-pattern> 

</servlet-mapping> 

<welcome-file-list> 

<welcome-file>index.jsp</welcome-file> 

</welcome-file-list> 

</web-app> 

 

 

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