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jQuery+json+servlet小例子

2011-09-15 10:05 218 查看

1、引入jar包：gson-1.7.1（google提供的json解决方案），下载网站：http://code.google.com/p/google-gson/

2、引入jQuery的js包

3、代码

1）客户端代码（jsp代码）

Html代码

<%@ 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>
<!-- 去除浏览器缓存 -->
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">

<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">

<script type="text/javascript" src="scripts/jquery-1.6.1.js"></script>
<!-- -->
<script type="text/javascript">
$(document).ready(function() {
$("#btn1").click(function() {
$.post(
"JsonServlet",
{"name":"张三"},
function(Date){
//alert(Date);
var html = "<table><tr><th>id</th><th>name</th><th>age</th><th>address</th><tr><td>"+Date.id+"</td><td>"+Date.name+"</td><td>"+Date.age+"</td><td>"+Date.address+"</td></tr></table>";
$("#show").html(html);
},
"json"
);
});
});
</script>
</head>

<body>
<input id="btn1" type="button" value="click me" />
<div id="show"></div>
</body>
</html>

2）服务器端代码（实体类Person）

Java代码

package com.yjw.pojo;

public class Person {
private int id;
private String name;
private int age;
private String address;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}

}

3）服务器端代码（servlet代码）

Java代码

package com.yjw.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 com.google.gson.Gson;
import com.yjw.pojo.Person;

public class JsonServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {

Person person = new Person();
person.setId(1);
person.setName("张三");
person.setAge(20);
person.setAddress("suzhou");

Gson gson = new Gson();
String result = gson.toJson(person);
//System.out.println(result);
//服务器返回类型设置为json格式
resp.setContentType("application/json; charset=utf-8");
//清缓存
resp.setHeader("pragma", "no-cache");
resp.setHeader("cache-control", "no-cache");
//服务器响应
PrintWriter out = resp.getWriter();
out.print(result);
out.close();
}

@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
// TODO Auto-generated method stub
this.doGet(req, resp);
}
}

4）web.xml配置

Xml代码

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
    http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
    <display-name></display-name>

    
    <servlet>
        <servlet-name>JsonServlet</servlet-name>
        <servlet-class>com.yjw.servlet.JsonServlet</servlet-class>
    </servlet>

    <servlet-mapping>
        <servlet-name>JsonServlet</servlet-name>
        <url-pattern>/JsonServlet</url-pattern>
    </servlet-mapping>

    <welcome-file-list>
        <welcome-file>index.jsp</welcome-file>
    </welcome-file-list>
</web-app>

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标签： servlet json jquery string html function

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