java解析字符串_java string 转jsonobject

@Controller
public class UserController {

@RequestMapping("/json1")
@ResponseBody
    public String json1() throws JsonProcessingException {
    //创建Json对象
    ObjectMapper mapper=new ObjectMapper();
    //创建一个User对象
    User user=new User("夯实",32,"男");
    //将我们的java对象转换为json字符串返回给浏览器
    String str = mapper.writeValueAsString(user);
    //返回字符串
    return str;
}
}

<mvc:annotation-driven>
   <mvc:message-converters register-defaults="true">
       <bean class="org.springframework.http.converter.StringHttpMessageConverter">
           <constructor-arg value="UTF-8"/>
       </bean>
       <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
           <property name="objectMapper">
               <bean class="org.springframework.http.converter.json.Jackson2ObjectMapperFactoryBean">
                   <property name="failOnEmptyBeans" value="false"/>
               </bean>
           </property>
       </bean>
   </mvc:message-converters>
</mvc:annotation-driven>