这篇文章在前边项目的基础上来整合json，最新项目资料见：http://download.csdn.net/detail/u012116457/8436187
首先需要的jar包：jackson-core-asl-1.7.2.jar jackson-mapper-asl-1.7.2.jar
然后是配置文件json-servlet.xml，该文件得在web.xml中配置使其在tomcat启动时调用：
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"
xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:context="http://www.springframework.org/schema/context"
xmlns:util="http://www.springframework.org/schema/util"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.0.xsd">
<!-- 配置对Json的支持 -->
<bean id="mappingJacksonHttpMessageConverter"
class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter">
<!-- 为了处理返回的JSON数据的编码，默认是ISO-88859-1的，这里把它设置为UTF-8,解决有乱码的情况 -->
<property name="supportedMediaTypes">
<list>
<value>text/html;charset=UTF-8</value>
</list>
</property>
</bean>
</beans>控制类如下：package module.controller;
import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import module.entity.User;
import module.service.LoginService;
import org.apache.log4j.Logger;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;
@Controller
@RequestMapping("/login")
public class LoginController {
private static String LOGINSUCCESS="module/jsp/index";
//@Autowired() @Qualifier("loginServiceImpl2")
@Resource(name="loginServiceImpl2")
private LoginService loginService;
@RequestMapping(value = "/login.do", method = RequestMethod.POST)
@ResponseBody //此注解表明返回值跳过视图处理部分，直接写入 http response body中
public User login(User user) {
System.out.println("用户:"+user.getName()+" 请求登陆");
User u = loginService.findByName(user.getName());
if(u==null){
u=new User();
u.setName("");
}
return u;
}
@RequestMapping("/loginSuccess.do")
public String start(HttpServletRequest request){
return LOGINSUCCESS;
}
}
在spring中，如果使用了@RequestMapping注解，会根据该方法的返回值映射到实际的url，如果同时还使用了@ResponseBody注解，则会跳过视图处理部分，将返回值直接写入http response body中，将其返回到客户端页面。如上边的代码，会将User格式的数据自动转换为json格式返回到客户端。
简单来说，如果需要返回json数据，则用@ResponseBody来注解该方法，返回类型为实体类即可。
下面是jsp页面：
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML >
<html>
<head>
<title>登陆</title>
<script type="text/javascript" src="<%=path %>/js/common/jquery.min.js"></script>
<script type="text/javascript" charset="utf-8">
function login(){
$.ajax({
url:'login/login.do',
data:{
name:document.getElementById("name").value,
password:document.getElementById("password").value
},
type:'POST',
dataType:'json',
success:function(data){
alert(data.name);
if(data.name!="")
window.location.href ='http://localhost:8080/springMVC/login/loginSuccess.do';
else
alert("用户名或密码错误");
},
error:function(){
alert("error");
}
});
}
</script>
</head>
<body>
<center>
<form>
姓名：<input type="text" name="name" id="name"><br/>
密码:<input type="password" name="password" id="password"></br>
<button type="button" onclick="login()">登陆</button>
</form>
</center>
</body>
</html>
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