<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
<script type="text/javascript">
//json对象
function loadInfo(){
var xmlHttp;
if(window.XMLHttpRequest){
xmlHttp=new XMLHttpRequest();
}else{
xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xmlHttp.onreadystatechange=function(){
if(xmlHttp.readyState==4 && xmlHttp.status==200){
alert(xmlHttp.responseText);
var dataObj=eval("("+xmlHttp.responseText+")");//得到的是json对象
alert(dataObj.name);//因为是json对象，所以能点属性
alert(dataObj.age);
document.getElementById("name").value=dataObj.name;
document.getElementById("age").value=dataObj.age;
}
};
xmlHttp.open("get", "getAjaxInfo?action=jsonObject", true);
xmlHttp.send();
}
//json数组
function loadInfo2(){
var xmlHttp;
if(window.XMLHttpRequest){
xmlHttp=new XMLHttpRequest();
}else{
xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xmlHttp.onreadystatechange=function(){
if(xmlHttp.readyState==4 && xmlHttp.status==200){
alert(xmlHttp.responseText);
var dataObj=eval("("+xmlHttp.responseText+")");
var st=document.getElementById("studentTable");
alert(dataObj.students.length);
var newTr; // 行
var newTd0; // 第一列
var newTd1; // 第二列
var newTd2; // 第三列
for(var i=0;i<dataObj.students.length;i++){
var student=dataObj.students[i];
newTr=st.insertRow();
newTd0=newTr.insertCell();
newTd1=newTr.insertCell();
newTd2=newTr.insertCell();
newTd0.innerHTML=student.name;
newTd1.innerHTML=student.age;
newTd2.innerHTML="语文:"+student.score.chinese+",数学:"+student.score.math+",英语:"+student.score.english;
}
}
};
// xmlHttp.open("get", "getAjaxInfo?action=jsonArray", true);
xmlHttp.open("get", "getAjaxInfo?action=jsonNested", true);
xmlHttp.send();
}
</script>
</head>
<body>
<div style="text-align: center;">
<div><input type="button" onclick="loadInfo()" value="Ajax获取信息"/> 姓名：<input type="text" id="name" name="name" /> 年龄：<input type="text" id="age" name="age" /></div>
<div style="margin-top: 20px;">
<input type="button" onclick="loadInfo2()" value="Ajax获取信息2"><br/>
<table id="studentTable" align="center" border="1px;" cellpadding="0px;">
<tr>
<th>姓名</th><th>年龄</th><th>得分</th>
</tr>
</table>
</div>
</div>
</body>
</html>
package com.wp.servlet
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 net.sf.json.JSONArray;
import net.sf.json.JSONObject;
public class GetAjaxInfoServlet extends HttpServlet {
/**
*
*/
private static final long serialVersionUID = 1L;
@Override
protected void doGet(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
this.doPost(request, response);
}
@Override
protected void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
response.setContentType("text/html;charset=utf-8");
String action = request.getParameter("action");
if ("jsonObject".equals(action)) {
this.getJsonObject(request, response);
} else if ("jsonArray".equals(action)) {
this.getJsonArray(request, response);
} else if ("jsonNested".equals(action)) {
this.getJsonNested(request, response);
}
}
/**
* json对象
*
* @param request
* @param response
* @throws ServletException
* @throws IOException
*/
private void getJsonObject(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
PrintWriter out = response.getWriter();
// String resultJson="{\"name\":\"张三\",\"age\":22}";//斜杠在这里是转义
JSONObject resultJson = new JSONObject();
resultJson.put("name", "张三");
resultJson.put("age", 22);
out.println(resultJson);
out.flush();
out.close();
}
/**
* 简单的json数组
*
* @param request
* @param response
* @throws ServletException
* @throws IOException
*/
private void getJsonArray(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
PrintWriter out = response.getWriter();
JSONObject resultJson = new JSONObject();
JSONArray jsonArray = new JSONArray();
JSONObject jsonObject1 = new JSONObject();
jsonObject1.put("name", "张三");
jsonObject1.put("age", 22);
JSONObject jsonObject2 = new JSONObject();
jsonObject2.put("name", "李四");
jsonObject2.put("age", 23);
JSONObject jsonObject3 = new JSONObject();
jsonObject3.put("name", "王五");
jsonObject3.put("age", 24);
jsonArray.add(jsonObject1);
jsonArray.add(jsonObject2);
jsonArray.add(jsonObject3);
resultJson.put("students", jsonArray);
out.println(resultJson);
out.flush();
out.close();
}
/**
* 多重json嵌套
*
* @param request
* @param response
* @throws ServletException
* @throws IOException
*/
private void getJsonNested(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
PrintWriter out = response.getWriter();
JSONObject resultJson = new JSONObject();// 创建最后结果的json
JSONArray jsonArray = new JSONArray();// json数组
JSONObject jsonObject1 = new JSONObject();// json对象
jsonObject1.put("name", "张三");
jsonObject1.put("age", 22);
JSONObject scoreObject1 = new JSONObject();
scoreObject1.put("chinese", 90);
scoreObject1.put("math", 100);
scoreObject1.put("english", 80);
jsonObject1.put("score", scoreObject1);
JSONObject jsonObject2 = new JSONObject();
jsonObject2.put("name", "李四");
jsonObject2.put("age", 23);
JSONObject scoreObject2 = new JSONObject();
scoreObject2.put("chinese", 70);
scoreObject2.put("math", 90);
scoreObject2.put("english", 90);
jsonObject2.put("score", scoreObject2);
JSONObject jsonObject3 = new JSONObject();
jsonObject3.put("name", "王五");
jsonObject3.put("age", 24);
JSONObject scoreObject3 = new JSONObject();
scoreObject3.put("chinese", 80);
scoreObject3.put("math", 60);
scoreObject3.put("english", 90);
jsonObject3.put("score", scoreObject3);
// {"score":{"chinese":80,"math":60,"english":90}}
jsonArray.add(jsonObject1);
jsonArray.add(jsonObject2);
jsonArray.add(jsonObject3);
// {"name":"王五","age":24,"score":{"chinese":80,"math":60,"english":90}}
resultJson.put("students", jsonArray);// "students":[数组]
// {"student":[{"name":"王五","age":24,"score":{"chinese":80,"math":60,"english":90}}]}
out.println(resultJson);
out.flush();
out.close();
}
}
ajax通过XMLHttpRequest的open和send方法进行请求，servlet端就是一个服务器端在接收请求后，通过response.getWriter()得到输出字符流，然后在html页面上通过XMLHttpRequest的responseText来得到响应的信息。
时间： 2024-10-07 04:11:17