exception-handling - ExceptionHandler 返回 JSON 或 XML 在 spring mvc 3 中不起作用

Question

代码是这样的:

   @Controller
    public class TestController {

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


        @ExceptionHandler(ABCException.class)
        public  @ResponseBody ErrorTO handleException(ABCException ex,
                HttpServletRequest request, HttpServletResponse response) {
            response.setStatus(response.SC_BAD_REQUEST);
            return new ErrorTO(ex.getMessage());
        }


     @RequestMapping(value = "/test", method = RequestMethod.GET)
    public @ResponseBody ErrorTO test(HttpServletRequest request, 
                                      HttpServletResponse response) {
        ErrorTO error = new ErrorTO();
        error.setCode(-12345);
        error.setMessage("this is a test error.");
        return error;
    }

}

当我尝试 curl -H "Accept:application/json"-v "http://localhost.com:8080/testerror"
我收到此错误:
org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerExceptionResolver - 找不到支持返回类型 [class com.kibboko.poprocks.appservices.dtos.ErrorTO] 和 [application/json] 的 HttpMessageConverter

但是如果我尝试 curl -H "Accept:application/json"-v "http://localhost.com:8080/test"，工作并返回 json 响应。 “应用程序/xml”也有效。

我需要处理异常处理程序有什么特别之处，以便它可以与 json 或 xml 一起使用吗？谢谢!

Answer 1

看来 AnnotationMethodHandlerExceptionResolver 有自己的 HttpMessageConverter 数组s。您需要将其配置为使用与 AnnotationMethodHandlerAdapter 相同的数组。 .

但是，当 AnnotationMethodHandlerAdapter 时可能会很复杂是隐式声明的。也许声明以下 FactoryBean在所有情况下都可能有帮助:

public class AnnotationMethodHandlerExceptionResolverFactoryBean
        implements FactoryBean<AnnotationMethodHandlerExceptionResolver> {
    @Autowired
    private AnnotationMethodHandlerAdapter a;

    public AnnotationMethodHandlerExceptionResolver getObject()
            throws Exception {
        AnnotationMethodHandlerExceptionResolver r = new AnnotationMethodHandlerExceptionResolver();
        r.setMessageConverters(a.getMessageConverters());
        return r;
    }

    ...
}