Ajax案例4-->接收后台传递的XML数据

jsp页面--fourthajax.jsp

 1 <%@ page language="java" contentType="text/html; charset=UTF-8"
 2     pageEncoding="UTF-8"%>
 3 <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
 4 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 5 <html>
 6 <head>
 7 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
 8 <title>fourthajax</title>
 9 </head>
10 <script type="text/javascript">
11 function createXMLHttpRequest(){
12     try{
13         return new XMLHttpRequest();
14     }catch(e){
15         try{
16             return new ActiveXObject("Msxml2.XMLHTTP");    
17         }catch(e){
18             try{
19                 return new ActiveXObject("Microsoft.XMLHTTP");
20             }catch(e){
21                     alert("浏览器不兼容");                
22             }
23         }
24     }
25 }
26 
27 window.onload = function(){
28     var btn = document.getElementById("btn");
29     
30     btn.onclick = function(){
31         
32         var xmlHttp = createXMLHttpRequest();
33         xmlHttp.open("GET", "<c:url value = '/FourthServlet'/>", true);
34         xmlHttp.send(null);
35     
36         xmlHttp.onreadystatechange= function(){
37 
38                 if (xmlHttp.readyState == 4 && xmlHttp.status == 200) {
39                     var doc = xmlHttp.responseXML;//获得document对象
40                     
41                     var rootEle = doc.documentElement;//获取document的根元素
42                     
43                     var idEle = rootEle.getAttribute("id");//获取document的属性
44                     var id = document.getElementById("id");//获取html的标签
45                     id.innerHTML = idEle;//将属性值写入标签中
46                     
47                     //获取子元素name
48                     var nameEle = rootEle.getElementsByTagName("name")[0].textContent;//获取document的子元素
49                     var name = document.getElementById("name");//获取html的标签
50                     name.innerHTML= nameEle;//将元素属性值写入html标签中
51                     
52                     //获取子元素age
53                     var ageEle = rootEle.getElementsByTagName("age")[0].textContent;
54                     var age = document.getElementById("age");
55                     age.innerHTML= ageEle;
56                     
57                     //获取子元素sex
58                     var sexEle = rootEle.getElementsByTagName("sex")[0].textContent;
59                     var sex = document.getElementById("sex");
60                     sex.innerHTML= sexEle;
61                 }
62             };
63         };
64     };
65 </script>
66 <body>
67 
68 <h1>获得servlet传递过来的xml元素</h1>
69 编号 : <span id = "id">空缺</span><br/>
70 姓名 : <span id = "name">空缺</span><br/>
71 年龄 : <span id = "age">空缺</span><br/>
72 性别 : <span id = "sex">空缺</span><br/>
73 <button id = "btn">获取用户信息</button>
74 </body>
75 </html>

Servlet-->FourthServlet.java

package ajax;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class FourthServlet extends HttpServlet {

    private static final long serialVersionUID = 5088028564192576929L;

    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

    response.setContentType("text/xml;charset=utf-8");
    String xml ="<student id='1000'><name>zhangsan</name><age>18</age><sex>male</sex></student>"; 
    response.getWriter().print(xml);
    }
}

图片展示:

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原文地址：https://www.cnblogs.com/vmkash/p/5522970.html