java - Spring MVC 异常处理程序是否只能支持 View 类型的返回类型？

Question

@RequestMapping(value = "/testerror", method = RequestMethod.GET)
        public
        @ResponseBody
        ErrorTO testerror(HttpServletRequest request, HttpServletResponse response) {
           throw new RuntimeException("erorrrrrr");
        }

        @ExceptionHandler(RuntimeException.class)
        public @ResponseBody ErrorTO handlePoprocksExceptionAsReponseBody(RuntimeException ex,
               HttpServletRequest request, HttpServletResponse response) {
            response.setStatus(response.SC_BAD_REQUEST);
            return new ErrorTO(ex.getMessage(), -999);
        }

以上代码无效。 StackTrace 看起来像这样:

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is java.lang.RuntimeException: erorrrrrr at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:656) at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:549) at javax.servlet.http.HttpServlet.service(HttpServlet.java:734) at javax.servlet.http.HttpServlet.service(HttpServlet.java:847)

我看了 Spring 3 controller exception handler implementation problems ，并且基于此，异常处理程序似乎只能返回 View 。是真的吗？

Answer 1

您必须让 Spring 知道如何通过您的异常处理程序转换返回对象，以便它可以写入 HTTP 响应。假设“ErrorTO”是一个 JAXB 对象，然后返回的内容类型是 application/xml 你应该在你的应用程序上下文中创建一个 HandlerExceptionResolver 并配置一个支持 application/xml 内容类型的消息转换器(例如 org.springframework.http.converter.xml .MarshallingHttpMessageConverter)。这是一个例子:

  <bean id="outboundExceptionAdapter" class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerExceptionResolver">
    <property name="messageConverters">
      <util:list>
        <ref bean="marshallingHttpMessageConverter"/>
      </util:list>
    </property>
  </bean>

  <bean id="marshallingHttpMessageConverter" class="org.springframework.http.converter.xml.MarshallingHttpMessageConverter">
    <property name="marshaller" ref="jaxb2Marshaller" />
    <property name="unmarshaller" ref="jaxb2Marshaller" />
  </bean>

  <bean id="jaxb2Marshaller" class="org.springframework.oxm.jaxb.Jaxb2Marshaller">
    <property name="contextPath" value="com.acme" />
  </bean>