<%@ 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。
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