触发弹簧MVC控制器404?

从Spring3.0开始,您还可以抛出用 @ResponseStatus 注释:

@ResponseStatus(value = HttpStatus.NOT_FOUND)
public class ResourceNotFoundException extends RuntimeException {
    ...
}

@Controller
public class SomeController {
    @RequestMapping.....
    public void handleCall() {
        if (isFound()) {
            // whatever
        }
        else {
            throw new ResourceNotFoundException(); 
        }
    }
}

重写方法签名以便它接受 HttpServletResponse 作为参数,以便可以调用 setStatus(int) 关于它。

http://static.springsource.org/spring/docs/3.0.x/spring-framework-reference/html/mvc.html#mvc-ann-requestmapping-arguments

我想说的是,Spring提供的404默认情况下有例外(不仅如此)。见 Spring documentation 详情。因此,如果您不需要自己的异常,您只需执行以下操作:

 @RequestMapping(value = "/**", method = RequestMethod.GET)
 public ModelAndView show() throws NoSuchRequestHandlingMethodException {
    if(something == null)
         throw new NoSuchRequestHandlingMethodException("show", YourClass.class);

    ...

  }

从弹簧3.0.2开始,您可以返回 ResponseEntity<T> 由于控制器的方法:

@RequestMapping.....
public ResponseEntity<Object> handleCall() {
    if (isFound()) {
        // do what you want
        return new ResponseEntity<>(HttpStatus.OK);
    }
    else {
        return new ResponseEntity<>(HttpStatus.NOT_FOUND);
    }
}

(responseentity<t>比@responsebody注释更灵活-请参见 another question )

你可以使用 @ControllerAdvice 为了处理你的例外情况, @controlleradvice注释类的默认行为将帮助所有已知的控制器。

所以当任何控制器抛出404错误时,都会调用它。

如下所示:

@ControllerAdvice
class GlobalControllerExceptionHandler {
    @ResponseStatus(HttpStatus.NOT_FOUND)  // 404
    @ExceptionHandler(Exception.class)
    public void handleNoTFound() {
        // Nothing to do
    }
}

并在web.xml中映射这个404响应错误,如下所示:

<error-page>
        <error-code>404</error-code>
        <location>/Error404.html</location>
</error-page>

希望有帮助。

如果您的控制器方法是用于文件处理之类的事情,那么 ResponseEntity 非常方便:

@Controller
public class SomeController {
    @RequestMapping.....
    public ResponseEntity handleCall() {
        if (isFound()) {
            return new ResponseEntity(...);
        }
        else {
            return new ResponseEntity(404);
        }
    }
}

虽然标记的答案是正确的,但有一种方法可以毫无例外地实现这一点。服务回来了 Optional<T> 搜索到的对象,并且此对象映射到 HttpStatus.OK 如果找到,则返回404。

@Controller
public class SomeController {

    @RequestMapping.....
    public ResponseEntity<Object> handleCall() {
        return  service.find(param).map(result -> new ResponseEntity<>(result, HttpStatus.OK))
                .orElse(new ResponseEntity<>(HttpStatus.NOT_FOUND));
    }
}

@Service
public class Service{

    public Optional<Object> find(String param){
        if(!found()){
            return Optional.empty();
        }
        ...
        return Optional.of(data); 
    }

}

我建议你扔 httpClientErrorException(httpClientErrorException) ,像这样

@RequestMapping(value = "/sample/")
public void sample() {
    if (somethingIsWrong()) {
        throw new HttpClientErrorException(HttpStatus.NOT_FOUND);
    }
}

您必须记住,这只能在将任何内容写入servlet输出流之前完成。

这有点晚了,但是如果你用 Spring Data REST 那么已经有了 org.springframework.data.rest.webmvc.ResourceNotFoundException 它也使用 @ResponseStatus 注释。不再需要创建自定义运行时异常。

另外,如果你想从你的控制器返回404状态,你所需要的就是这样做。

@RequestMapping(value = "/somthing", method = RequestMethod.POST)
@ResponseBody
public HttpStatus doSomthing(@RequestBody String employeeId) {
    try{
  return HttpStatus.OK;
    } 
    catch(Exception ex){ 
  return HttpStatus.NOT_FOUND;
    }
}

通过这样做,您将收到404错误,以防您想从控制器返回404。

只需使用web.xml添加错误代码和404错误页。但要确保404错误页不能位于WEB-INF下。

<error-page>
    <error-code>404</error-code>
    <location>/404.html</location>
</error-page>

这是最简单的方法,但有一些限制。假设您想为这个页面添加与其他页面相同的样式。你不能这样做。你必须使用 @ResponseStatus(value = HttpStatus.NOT_FOUND)

使用设置配置web.xml

<error-page>
    <error-code>500</error-code>
    <location>/error/500</location>
</error-page>

<error-page>
    <error-code>404</error-code>
    <location>/error/404</location>
</error-page>

创建新控制器

   /**
     * Error Controller. handles the calls for 404, 500 and 401 HTTP Status codes.
     */
    @Controller
    @RequestMapping(value = ErrorController.ERROR_URL, produces = MediaType.APPLICATION_XHTML_XML_VALUE)
    public class ErrorController {


        /**
         * The constant ERROR_URL.
         */
        public static final String ERROR_URL = "/error";


        /**
         * The constant TILE_ERROR.
         */
        public static final String TILE_ERROR = "error.page";


        /**
         * Page Not Found.
         *
         * @return Home Page
         */
        @RequestMapping(value = "/404", produces = MediaType.APPLICATION_XHTML_XML_VALUE)
        public ModelAndView notFound() {

            ModelAndView model = new ModelAndView(TILE_ERROR);
            model.addObject("message", "The page you requested could not be found. This location may not be current.");

            return model;
        }

        /**
         * Error page.
         *
         * @return the model and view
         */
        @RequestMapping(value = "/500", produces = MediaType.APPLICATION_XHTML_XML_VALUE)
        public ModelAndView errorPage() {
            ModelAndView model = new ModelAndView(TILE_ERROR);
            model.addObject("message", "The page you requested could not be found. This location may not be current, due to the recent site redesign.");

            return model;
        }
}