json 用法
json.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'JSON.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
<script type="text/javascript" src="json.js"></script>
<script type="text/javascript">
var xmlHttp;
function createXMLHttpRequest()
{
if(window.ActiveXObject)
{
xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
}
else if(window.XMLHttpRequest)
{
xmlHttp = new XMLHttpRequest();
}
}
function Car(make,model,year,color){
this.make=make;
this.model=model;
this.year=year;
this.color=color;
}
function doJSON(){
var car=new Car();
car.make="mm";
car.model="ee";
car.year=1984;
car.color="red";
var carAsJSON=car.toJSONString();
var a=carAsJSON.parseJSON();
window.alert(carAsJSON);
var url="TestJSON?time="+new Date().getTime();
createXMLHttpRequest();
xmlHttp.open("post", url, true);
xmlHttp.onreadystatechange = callback;//指定响应函数
xmlHttp.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
xmlHttp.send(carAsJSON);
}
function callback(){
if (xmlHttp.readyState == 4) { // 判断对象状态
if (xmlHttp.status == 200) { // 信息已经成功返回，开始处理信息
var data=xmlHttp.responseText;
var e=document.getElementById("d");
var a=document.createTextNode(data);
e.appendChild(a);
}
}
}
</script>
</head>
<body>
<input type="button" onclick="doJSON();" value="aaa"/>
<div id="d"></div>
</body>
</html>
json.java
package test;
import java.io.BufferedReader;
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 org.json.*;
public class TestJSON extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
String json=readJSON(request);
JSONObject jsonObject=null;
try {
jsonObject=new JSONObject(json);
} catch (JSONException e) {
e.printStackTrace();
}
try {
String r="1:"+jsonObject.getInt("year")+" 2:"+jsonObject.getString("make")+" 3:"
+jsonObject.getString("model")+" 4:"+jsonObject.getString("color");
out.println(r);
out.flush();
out.close();
} catch (JSONException e) {
e.printStackTrace();
}
}
private String readJSON(HttpServletRequest request){
StringBuffer json=new StringBuffer();
String s=null;
try{
BufferedReader reader=request.getReader();
while((s=reader.readLine())!=null){
System.out.println(s);
json.append(s);
}
}
catch(Exception e){
e.printStackTrace();
}
return json.toString();
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
this.doGet(request, response);
}
}
最后还要导入json.js解析器在json.jsp中导入
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'JSON.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
<script type="text/javascript" src="json.js"></script>
<script type="text/javascript">
var xmlHttp;
function createXMLHttpRequest()
{
if(window.ActiveXObject)
{
xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
}
else if(window.XMLHttpRequest)
{
xmlHttp = new XMLHttpRequest();
}
}
function Car(make,model,year,color){
this.make=make;
this.model=model;
this.year=year;
this.color=color;
}
function doJSON(){
var car=new Car();
car.make="mm";
car.model="ee";
car.year=1984;
car.color="red";
var carAsJSON=car.toJSONString();
var a=carAsJSON.parseJSON();
window.alert(carAsJSON);
var url="TestJSON?time="+new Date().getTime();
createXMLHttpRequest();
xmlHttp.open("post", url, true);
xmlHttp.onreadystatechange = callback;//指定响应函数
xmlHttp.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
xmlHttp.send(carAsJSON);
}
function callback(){
if (xmlHttp.readyState == 4) { // 判断对象状态
if (xmlHttp.status == 200) { // 信息已经成功返回，开始处理信息
var data=xmlHttp.responseText;
var e=document.getElementById("d");
var a=document.createTextNode(data);
e.appendChild(a);
}
}
}
</script>
</head>
<body>
<input type="button" onclick="doJSON();" value="aaa"/>
<div id="d"></div>
</body>
</html>
json.java
package test;
import java.io.BufferedReader;
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 org.json.*;
public class TestJSON extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
String json=readJSON(request);
JSONObject jsonObject=null;
try {
jsonObject=new JSONObject(json);
} catch (JSONException e) {
e.printStackTrace();
}
try {
String r="1:"+jsonObject.getInt("year")+" 2:"+jsonObject.getString("make")+" 3:"
+jsonObject.getString("model")+" 4:"+jsonObject.getString("color");
out.println(r);
out.flush();
out.close();
} catch (JSONException e) {
e.printStackTrace();
}
}
private String readJSON(HttpServletRequest request){
StringBuffer json=new StringBuffer();
String s=null;
try{
BufferedReader reader=request.getReader();
while((s=reader.readLine())!=null){
System.out.println(s);
json.append(s);
}
}
catch(Exception e){
e.printStackTrace();
}
return json.toString();
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
this.doGet(request, response);
}
}
最后还要导入json.js解析器在json.jsp中导入