The resource identified by this request is only capable of generating responses with characteristics
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今天在调试springMVC的时候,在将一个对象返回为json串的时候,浏览器中出现异常:
The resource identified by this request is only capable of generating responses with characteristics not acceptable according to the request "accept" headers ().从网上查了下,说是让配置下json转化bean:
<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter"><property name="messageConverters"><list><ref bean="mappingJacksonHttpMessageConverter" /></list></property></bean><bean id="mappingJacksonHttpMessageConverter" class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter"><property name="supportedMediaTypes"><list><value>application/json;charset=UTF-8</value></list></property></bean>
配置完运行后还是报上述错误。
应该不是配置原因,从http://forum.spring.io/forum/spring-projects/web/82137-spring-3-and-ajax这个网址中查出以下配置:
<bean id="messageAdapter" class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter"> <property name="messageConverters"> <list> <!-- Support JSON --> <bean class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter"/> </list> </property> </bean> <bean id="exceptionMessageAdapter" class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerExceptionResolver"> <property name="messageConverters"> <list> <!-- Support JSON --> <bean class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter"/> </list> </property> </bean>
其中第一个和之前的配置没有什么差别,但是第二个exceptionMessageAdapter,这个是处理转化json异常的适配器(这个配置对于调试查找问题还是非常有用的)。
当用这个配置替换上面的配置时,浏览器报了如下异常:
org.springframework.web.HttpMediaTypeNotAcceptableException: Could not find acceptable representation
经查,在http://blog.csdn.net/xplizm/article/details/8205882这篇博文中,提到出现这个问题的原因是因为,@ResponseBody返回的对象中的属性缺少set\get方法。
将返回对象加上set\get方法后,一切ok。
这是xplizm的博文中的总结:
开始总以为是Content-Type或者Accept属性有问题,但找了半天原因才发现这里有个基本的要求:POJO对象要转成Json,则要求POJO中的属性必须都有getter方法,加上getter方法后就正常了 :)
ps:
1.当最后调试正确后,我把上述的配置都注释掉,并加上下面这两个配置:
<context:annotation-config />
<mvc:annotation-driven />
发现也可以正常使用。这说明,可以使用上面的两个简单说明就可以使用springMVC的@ResponseBody注解,并返回json串。
2. 调试配置也是很重要的,调试时报出的异常要比tomcat直接返回的406码要直接的多,更近的接近真相
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