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Ajax传输Json和xml数据

ajax传输xml数据:只要把数据封装成xml格式就可以实现传输,前台js用responseXML接收xml参数,后台读取用流和dom4j来解析

前台页面

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>Ajax XML数据处理演示</title>
<script type="text/javascript"> //get方式ajax function send1(){ alert("ok"); var name=document.getElementsByName("name")[0].value; var age=document.getElementsByName("age")[0].value; var xhr=null; if(window.XMLHttpRequest){ xhr=new XMLHttpRequest(); }else{ xhr=new ActiveXObject("Microsoft.XMLHttp"); } var url="<c:url value='/XmlServlet?name='/>"+name+"&age="+age; //3设置访问方式 xhr.open("GET",url,true); //4设置访问成功返回后的操作 xhr.onreadystatechange=function(){ if(xhr.readyState==4){//返回 if(xhr.status==200){//响应代码正常 var txt=xhr.responseText; alert(txt); } } }; xhr.send(null); } </script>

<!-- 前台以xml的格式向服务器发送数据 -->
<script type="text/javascript"> //post方式ajax function send2(){ alert("222"); //1创建ajax对象 var xhr = null; if(window.XMLHttpRequest){//高版本 xhr = new XMLHttpRequest(); }else{//低版本 xhr = new ActiveXObject("Microsoft.XMLHttp"); } //2请求地址 var url = "<c:url value='/XmlServlet'/>"; //3设置访问方式 xhr.open("POST",true); //4设置访问成功返回后的操作 xhr.onreadystatechange=function(){ if(xhr.readyState==4){//返回 if(xhr.status==200){//响应代码正常 var xmlObj=xhr.responseXML; var users=xmlObj.getElementsByTagName("user"); for(var i=0;i<users.length;i++){ var id=users[i].getAttribute("id"); var name=users[i].childNodes[0].firstChild.data;//xml中的dom模型中的操作方法,和html中有点小差别 var age=users[i].childNodes[1].firstChild.data;//不能用childNodes["age"] alert(id+","+name+","+age); } } } }; var name=document.getElementsByName("name")[0].value; var age=document.getElementsByName("age")[0].value; var xml="<user><name>"+name+"</name><age>"+age+"</age></user>"; xhr.send(xml); } </script>

</head>
<body>
    Name:
    <input type="text" name="name">
    <br /> Age:
    <input type="text" name="age">
    <br />
    <input type="button" value="Get提交" onclick="send1();" />
    <br />
    <input type="button" value="Post提交" onclick="send2()" />
    <br />
</body>
</html>

后台页面

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>Ajax XML数据处理演示</title>
<script type="text/javascript"> //get方式ajax function send1(){ alert("ok"); var name=document.getElementsByName("name")[0].value; var age=document.getElementsByName("age")[0].value; var xhr=null; if(window.XMLHttpRequest){ xhr=new XMLHttpRequest(); }else{ xhr=new ActiveXObject("Microsoft.XMLHttp"); } var url="<c:url value='/XmlServlet?name='/>"+name+"&age="+age; //3设置访问方式 xhr.open("GET","+age); } } } }; var name=document.getElementsByName("name")[0].value; var age=document.getElementsByName("age")[0].value; var xml="<user><name>"+name+"</name><age>"+age+"</age></user>"; xhr.send(xml); } </script>

</head>
<body>
    Name:
    <input type="text" name="name">
    <br /> Age:
    <input type="text" name="age">
    <br />
    <input type="button" value="Get提交" onclick="send1();" />
    <br />
    <input type="button" value="Post提交" onclick="send2()" />
    <br />
</body>
</html>

Ajax传输Json数据的要点利用Apache或者阿里巴巴的JSONArray类进行传输
前台代码

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>Ajax Json数据处理演示</title>
<script type="text/javascript"> function ask1() { //1创建ajax对象 var xhr = null; if (window.XMLHttpRequest) {//高版本 xhr = new XMLHttpRequest(); } else {//低版本 xhr = new ActiveXObject("Microsoft.XMLHttp"); } //2请求地址 var url = "<c:url value='/JsonServlet1'/>"; //3设置访问方式 xhr.open("POST",true); //4设置访问成功返回后的操作 xhr.onreadystatechange = function() { if (xhr.readyState == 4) {//返回 if (xhr.status == 200) {//响应代码正常 //※※※※※解析后台返回的json串 //js中eval()方法功能:是校验参数文本串符合js中哪一种数据类型,并把其转换成对应类型的对象 var txt = xhr.responseText; var users = eval("(" + txt + ")"); //把符合json格式的文本串 转换成 json对象 for ( var i = 0; i < users.length; i++) { alert(users[i].id + "," + users[i].name + "," + users[i].age); } } } }; //5 发送 xhr.send(null); } function ask2() { //1创建ajax对象 var xhr = null; if (window.XMLHttpRequest) {//高版本 xhr = new XMLHttpRequest(); } else {//低版本 xhr = new ActiveXObject("Microsoft.XMLHttp"); } //2请求地址 var url = "<c:url value='/JsonServlet2'/>"; //3设置访问方式 xhr.open("POST",true); //4设置访问成功返回后的操作 xhr.onreadystatechange = function() { if (xhr.readyState == 4) {//返回 if (xhr.status == 200) {//响应代码正常 //※※※※※解析后台返回的json串 //js中eval()方法功能:是校验参数文本串符合js中哪一种数据类型,并把其转换成对应类型的对象 var txt = xhr.responseText; //alert(txt); //把符合json格式的文本串 转换成 json对象 var users = eval("(" + txt + ")"); for ( var key in users)//map的便利方式 alert("属性:" + key + ",值:" + users[key]); } //for ( var i = 0; i < users.length; i++) {//list的遍历方式 //alert(users[i].id +","+users[i].name+","+users[i].age); //} }; }; //5 发送 xhr.send(null); } function ask3() { //1创建ajax对象 var xhr = null; if (window.XMLHttpRequest) {//高版本 xhr = new XMLHttpRequest(); } else {//低版本 xhr = new ActiveXObject("Microsoft.XMLHttp"); } //2请求地址 var url = "<c:url value='/JsonServlet2'/>"; //3设置访问方式 xhr.open("POST","+users[i].age); //} }; }; //5 发送 xhr.send(null); } </script>

</head>
<body>
    <input type="button" onclick="ask1();" value="ajax请求后台数据(手动封装json方式)" />
    <br />
    <input type="button" onclick="ask2();" value="ajax请求后台数据(用apache工具封装json方式)" />
    <input type="button" onclick="ask3()" value="ajax请求后台数据(用fastjson工具封装json方式)" />
</body>
</html>

JsonServlet1.java

package cn.hncu.servlet;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.List;

import javax.servlet.servletexception;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import cn.hncu.domain.User;

public class JsonServlet1 extends HttpServlet {

    public void doGet(HttpServletRequest request,HttpServletResponse response)
            throws servletexception,IOException {
        doPost(request,response);
    }


    public void doPost(HttpServletRequest request,IOException {
        //调用后台service.dao.query(),到数据库当中把信息读取出来
        //为简化知识点的理解,此处后台部分的功能直接模拟
        response.setContentType("text/html;charset=utf-8");
        PrintWriter out = response.getWriter();
        List<User> users = new ArrayList<User>();
        users.add(new User("A001","Jack",20));
        users.add(new User("A002","Rose",22));
        users.add(new User("B001","张三",20));
        users.add(new User("B002","李四",30));
        String json="";
        //用java封装出json格式的字符串:[{name:"Jack",age:25},{...},{...} ]
        for(User u:users){
            if(json.equals("")){
                json="{name:\""+u.getName()+"\",id:\""+u.getId()+"\",age:"+u.getAge()+"}";
            }else{
                json = json +",{ name:\""+u.getName()+"\",age:"+u.getAge()+"}" ;
            }
        }
        json="["+json+"]";
        out.print(json);
    }

}

JsonServlet2.java

package cn.hncu.servlet;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.HashMap;
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 cn.hncu.domain.User;

import net.sf.json.JSONArray;
import net.sf.json.JSONObject;

public class JsonServlet2 extends HttpServlet {

    public void doPost(HttpServletRequest request,HttpServletResponse response)
            throws servletexception,IOException {

        response.setContentType("text/html;charset=utf-8");
        PrintWriter out = response.getWriter();
        List<User> users = new ArrayList<User>();
        users.add(new User("A001",20));
        users.add(new User("A002",22));
        users.add(new User("B001",20));
        users.add(new User("B002",30));
        String strjson=com.alibaba.fastjson.JSONArray.toJSONString(users);
        System.out.println(strjson);
        //用fastjson工具(只有一个jar包)帮我们把list转换成json串
        Map<String,Object> map = new HashMap<String,Object>();
        map.put("addr","湖南");
        map.put("height","170");
        map.put("marry","no");
        map.put("user",new User("A003","小李",25));
        String strMap=com.alibaba.fastjson.JSONArray.toJSONString(map);

        out.print(strMap.toString());
    }

}

JsonServlet3.java

package cn.hncu.servlet;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.HashMap;
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 net.sf.json.JSONArray;
import net.sf.json.JSONObject;
import cn.hncu.domain.User;

public class JsonServlet3 extends HttpServlet {

    public void doPost(HttpServletRequest request,30));
        //用fastjson工具(只有一个jar包)帮我们把list转换成json串
        JSONArray json=JSONArray.fromObject(users);
        String strjson=json.toString();
        System.out.println(strjson);

        Map<String,25));
        JSONObject obj = JSONObject.fromObject(map);
        System.out.println(obj.toString());

        out.print(obj.toString());
    }

}

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