Spring mvc json 无法返回

Question

<?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:mvc="http://www.springframework.org/schema/mvc"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/mvc
        http://www.springframework.org/schema/mvc/spring-mvc.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd">

    <mvc:annotation-driven/>

    <mvc:default-servlet-handler/>

    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>
        <property name="prefix" value="/WEB-INF/jsp/"/>
        <property name="suffix" value=".jsp"/>
    </bean>


    <context:component-scan base-package="org.twtpush.web"/>
</beans>

pom.xml

dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-core</artifactId>
      <version>2.5.4</version>
    </dependency>

    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-databind</artifactId>
      <version>2.5.4</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-annotations -->
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-annotations</artifactId>
      <version>2.5.4</version>
    </dependency>

controller

@Controller
@RequestMapping("/push")
public class PushController {

    private final Logger logger = LoggerFactory.getLogger(this.getClass());

    @Autowired
    private IPushService pushService;

    @RequestMapping(value = "/{a}/push",
            method = RequestMethod.GET,
            produces = {"application/json;charset=UTF-8"})
    @ResponseBody
    public Operate pu(@PathVariable("a") String a){
        Operate operate = new Operate(true,a,0001);
        return operate;
    }
}

结果

HTTP Status 406 -

type Status report

message

description The resource identified by this request is only capable of generating responses with characteristics not acceptable according to the request "accept" headers.

Apache Tomcat/8.0.36

Answer 1

错误具体参考Http 406错误码描述。

根据spring mvc json的一般经验，有几种可能，一个是没有JSON依赖包，一个是JSON解析配置有问题，但是看你的XML配置和Controller都没大问题。

推测可能是你的Java Bean中没有完整的 setter/getter 方法。

Spring的重要一点就是基于Bean的，所以要按照规范来的。

Answer 2

Operate忘了getter/setter方法

Answer 3

ajax中请求的url使用.json结尾试试，我也因为这个问题找过好久