自己总结的json 各个细节，方便自己回顾
package com.cpic.servlet;
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;
import java.io.*;
import java.util.*;
/**
* json对象
* 1.json包6个 json.js和jquery.js
* 2.resp.setContentType("appliction/json;charset=utf-8");
* resp.setContentType("text/javascript;charset=utf-8");
* dataType: "json",
* 3.后台传过去的数据格式一定要对！
* 4.接受解析的方法要对！
* @author Administrator
*
*/
public class JsonServlet extends HttpServlet {
@Override
protected void service(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
req.setCharacterEncoding("utf-8");
resp.setContentType("appliction/json;charset=utf-8");
//获得前台数据
String sss = (String)req.getParameter("json");
PrintWriter out =resp.getWriter();
//------------------------------------------------
String name="zhangsan";
String age ="22";
//单个JSON对象：单个数据和多个数据(直接写入参数和变量两种) 请仔细查看格式!
//正确
//out.print(JSONObject.fromObject("{test:'hehe',t2:'haha'}").toString());
//out.print(JSONObject.fromObject("{name:'"+name+"',age:'"+age+"'}").toString());
//错误没有引号
//out.print(JSONObject.fromObject("{test:hehe,t2:haha}").toString());
//out.print(JSONObject.fromObject("{name:"+name+","age:"+age+"}").toString());
//----------------------------------------------
//JSON数据对象:可以用数组 或者 用List
//数组
//String[] str = GetFirstFloorValue();
//System.out.println(JSONArray.fromObject(str).toString());
//out.print(JSONArray.fromObject(str).toString());
//List
//List<String> list =getList();
//System.out.println(JSONArray.fromObject(list).toString());
//out.print(JSONArray.fromObject(list).toString());
out.flush();
out.close();
}
private String[] GetFirstFloorValue() {
String[] str = new String[4];
String t="java1";
//错误的！
// str[0] = "{test:"+t+",t2:"+t+"}";
// str[1] = "{test:"+t+",t2:"+t+"}";
// str[2] = "{test:"+t+",t2:"+t+"}";
// str[3] = "{test:"+t+",t2:"+t+"}";
// str[0] = "{test:桌面应用,t2:桌面应用}";
// str[1] = "{test:移动设备,t2:移动设备}";
// str[2] = "{test:服务器端,t2:服务器端}";
// str[3] = "{test:嵌入式开发,t2:嵌入式开发}";
//正确的！ 一定要有引号！
// str[0] = "{test:'"+t+"',test2:'"+t+"'}";
// str[1] = "{test:'"+t+"',test2:'"+t+"'}";
// str[2] = "{test:'"+t+"',test2:'"+t+"'}";
// str[3] = "{test:'"+t+"',test2:'"+t+"'}";
str[0] = "{test:'桌面应用',test2:'桌面应用'}";
str[1] = "{test:'移动设备',test2:'移动设备'}";
str[2] = "{test:'服务器端',test2:'服务器端'}";
str[3] = "{test:'嵌入式开发',test2:'嵌入式开发'}";
return str;
}
public List<String> getList(){
String name ="java2";
String age="22";
String a[]=new String[2];
a[0]="{name:'"+name+"',age:'"+age+"'}";
a[1]="{name:'"+name+"',age:'"+age+"'}";
List<String> list= new ArrayList<String>();
list.add(a[0]);
list.add(a[1]);
return list;
}
}
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<script src="./Js/jquery-1.6.4.js" language="javascript" ></script>
<script src="./Js/json.js" language="javascript"></script>
<script language="javascript">
function ads(){
$.ajax({
url: "json.do",
type: "post",
data: {json:$("#input").val(),test:$("#input").val()},
dataType: "json",
success: function(msg){
//JSONObject
//alert(msg.name+"|"+msg.age);
//JSONArray 数组
//$.each(msg,function(i,item){
// alert(item.test+"|"+item.test2);
//})
//JSONArray List
//$.each(msg,function(i,item){
// alert(item.name+"|"+item.age);
//})
}
})
}
</script>
<input type="text" id="input" />
<input type="button" value="确定" onclick="ads()"/>
<table id="tb">
</table>
</html>