Spring MVC 异常处理程序只能支持 View 类型的返回类型吗？

发布于 2024-10-30 20:00:15 字数 1359 浏览 0 评论 0原文

@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);
        }

上面的代码没有工作。 StackTrace 看起来像这样：

org.springframework.web.util.NestedServletException：请求处理失败；嵌套的例外是 java.lang.RuntimeException: errrrrrr 在 org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:656) 在 org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:549) 在 javax.servlet.http.HttpServlet.service(HttpServlet.java:734) 在 javax.servlet.http.HttpServlet.service(HttpServlet.java:847)

我查看了 Spring 3 控制器异常处理程序实现问题，基于此，异常处理程序似乎只能返回视图。这是真的吗？

原文

@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);
        }

The above code did not work. StackTrace looked like this:

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)

I looked at Spring 3 controller exception handler implementation problems , and based on that it seems to be that exception handlers can only return views. Is that true?

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半岛未凉 2024-11-06 20:00:15

您必须让 Spring 知道如何通过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 您应该在应用程序上下文中创建一个 HandlerExceptionResolver 并配置支持 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>

You have to let Spring know how to convert the return Object by you exception handler so it can write to HTTP response.
Lets say "ErrorTO" is a JAXB object and then returned content type is application/xml you should create a HandlerExceptionResolver in your application context and configure a message converter that support application/xml content type (e.g. org.springframework.http.converter.xml.MarshallingHttpMessageConverter). here is an example:

  <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>

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