SpringMvc 返回数据为json

@ResponseBody注解将内容或者对象当成http正文返回

配置json，引入jackson的jar包

从请求和响应读取/编写字符串

<bean id="stringHttpMessage" class="org.springframework.http.converter.StringHttpMessageConverter">

<property name="supportedMediaTypes">

<list>

<value>test/plain;charset=UTF-8</value>

</list>

</property>

</bean>

用于对象转化为json

<bean id="jsonConverter" class="org.springframework.http.json.MappingJacksonHttpMessageConverter">

<bean  class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter"/>

<property name="messageConverters">

<list>

<ref vean="stringHttpMessage"/>

<ref bean="jsonConverter"/>

</list>

</property>

</bean>