后台运行结果： 前台运行结果：
first.jsp:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
<script type="text/javascript" src="jQuery/jquery-1.9.1.min.js"></script>
<script type="text/javascript">
function test2(){ //用这种方式组装的json数组是正确的
var testArray = new Array();
for(var i = 0; i < 5; i++) {
var tempArray = new Array();
for(var j = 0; j < 10; j++){
tempArray.push(i*j);
}
testArray.push(tempArray);
}
alert("tempArray=" + tempArray); //用这种方式组装的json数组是正确的
var jsonArr = new Array();
for ( var j = 0; j < 3; j++) {
var jsonObj = {};
jsonObj["gradeId"]=1;
jsonObj["gradeName"]=2;
jsonObj["level"]=3;
jsonObj["boundary"]=4;
jsonObj["status"]=5;
jsonArr.push(jsonObj)
}
alert("jsonArr=" + jsonArr); // 用这种方式组装的json数组是错误的，接收侧只能接收到整个的这个字符串
var employees='[';
for ( var j = 0; j < 5; j++) {
employees+= '{';
employees+="name:";
employees+="zhang";
employees+=",";
employees+="old:";
employees+=30 + j;
employees +='}';
if(j!=4){
employees+=','
};
}
employees+=']';
alert("employees=" + employees); $.ajax({
type:"POST", //请求方式
url:"./testJson", //请求路径
cache: false,
data:{//传参
"name":"zhang3",
"testArray":testArray,
"students": //用这种方式传递多维数组也是正确的
[
{"name":"jackson","age":100},
{"name":"michael","age":51}
],
"employees":employees,
"jsonArr":jsonArr
},
dataType: 'json', //返回值类型
success:function(json){
alert(json[0].username+" " + json[0].password); //弹出返回过来的List对象
alert(json[1].username+" " + json[1].password); //弹出返回过来的List对象
}
});
}
</script>
</head> <body>
<input type="button" name="b" value="TestJson" onclick="test2()"/>
</body> </html>
TestJson.java
package com.zm.servlet; import java.io.BufferedReader;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map; import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession; import net.sf.json.JSONArray;
import net.sf.json.JSONObject; public class TestJson extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doPost(request,response);
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
System.out.println("into doPost"); //用map来接收request发送过来的多维数组
Map map = request.getParameterMap();
Iterator<String> iter = map.keySet().iterator();
while (iter.hasNext()) {
String key = iter.next();
System.out.println("key=" + key );
String[] value = (String[]) map.get(key);
System.out.print("value=");
for(String v:value){
System.out.print(v + " ");
}
System.out.println();
} String sName= request.getParameter("name");//得到ajax传递过来的paramater
System.out.println(sName); PrintWriter printWriter = response.getWriter();
List list = new ArrayList();//传递List Map m=new HashMap();//传递Map
User u1=new User();
u1.setUsername("zah");
u1.setPassword("123");
User u2=new User();
u2.setUsername("ztf");
u2.setPassword("456");
list.add(u1); //添加User对象
list.add(u2); //添加User对象 m.put("u1", u1);
m.put("u2", u2); JSONArray jsonArray2 = JSONArray.fromObject( list );
//把java数组转化成转化成json对象
//JSONObject jsonObject =JSONObject.fromObject(m);//转化Map对象
printWriter.print(jsonArray2);//返给ajax请求
//printWriter.print(jsonObject);//返给ajax请求
printWriter.flush();
printWriter.close();
System.out.println("finish");
}
}
web.xml:
<!-- 测试jquery json-->
<servlet>
<servlet-name>testJson</servlet-name>
<servlet-class>com.zm.servlet.TestJson</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>testJson</servlet-name>
<url-pattern>/testJson</url-pattern>
</servlet-mapping>