springmvc解析和输出json数据

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核心就是 @ResponseBody注解，和@RequestBody注解

1.@ResponseBody:

-servlet.xml 文件中加上这个配置：

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    <!-- rest json related... start -->
    <bean id="mappingJacksonHttpMessageConverter"
          class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
        <property name="supportedMediaTypes">
            <list>
                <value>application/json;charset=UTF-8</value>
            </list>
        </property>
    </bean>
    <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
        <property name="messageConverters">
            <list>
                <ref bean="mappingJacksonHttpMessageConverter"/>
            </list>
        </property>
    </bean>
    <!-- rest json related... end -->

别忘了导入相关依赖包哦：

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<dependency>
    <groupId>org.codehaus.jackson</groupId>
    <artifactId>jackson-mapper-asl</artifactId>
    <version>1.9.13</version>
</dependency>
<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-annotations</artifactId>
    <version>2.6.1</version>
</dependency>
<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-core</artifactId>
    <version>2.6.1</version>
</dependency>
<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.6.1</version>
</dependency>
<dependency>
    <groupId>org.json</groupId>
    <artifactId>json</artifactId>
    <version>20140107</version>
</dependency>

    @RequestMapping("/index")    @ResponseBody    public  UserInfo index(@RequestParam(value="sig",required=false) String sig){        UserInfo userinfo=new UserInfo();        userinfo.setNickName(sig);        return userinfo;    }

UserInfo是创建的一个实体类

2.RequestBody:

   @RequestMapping("/jsonRequest")    @ResponseBody    public ErrorMessage ajson(@RequestBody UserInfo userinfo){    ErrorMessage err=new ErrorMessage();    err.setErr(userinfo.getNickName());    return err;    }

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