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java - 为找不到资源创建自定义异常 404 SPRING BOOT

问题描述

我确实有一个类CustomResponseEntityExceptionHandler类扩展ResponseEntityExceptionHandler了 2 种方法，一种用于处理错误格式，另一种用于请求资源（url）但不存在时。我想给用户一个自定义消息，而不是 Spring 的默认白标错误页面。我试图理解为什么在请求不存在的 URI 时不调用我的handleResourceNotFoundException方法，CustomResponseEntityExceptionHandler但我一直有白标错误页面。谢谢你的帮助！

curl localhost:8080/doesnotexist

这是我的CustomResponseEntityExceptionHandler

@ExceptionHandler(Exception.class)
public final ResponseEntity<ErrorDetails> handleAllWrongFormatExceptions(WrongFormatException ex,
        WebRequest request) {
    ErrorDetails errorDetails = new ErrorDetails(new Date(), ex.getMessage(), request.getDescription(true));
    return new ResponseEntity<>(errorDetails, HttpStatus.INTERNAL_SERVER_ERROR);
}

@ExceptionHandler(ResourceNotFoundException.class)
public final ResponseEntity<ErrorDetails> handleResourceNotFoundException(ResourceNotFoundException ex,
        WebRequest request) {
    ErrorDetails errorDetails = new ErrorDetails(new Date(), ex.getMessage(), request.getDescription(false));
    return new ResponseEntity<>(errorDetails, HttpStatus.NOT_FOUND);
}

用于保存自定义错误详细信息的简单类

public class ErrorDetails {

private Date timestamp;
private String message;
private String details;

public ErrorDetails(Date timestamp, String message, String details) {

    this.timestamp = timestamp;
    this.message = message;
    this.details = details;
}

public Date getTimestamp() {
    return timestamp;
}

public String getMessage() {
    return message;
}

public String getDetails() {
    return details;
} }

这是我的控制器

@Controller
public class StringManipController {

@Autowired
private StringProcessingService stringProcessingService;

@GetMapping("/")
@ExceptionHandler(ResourceNotFoundException.class)
@ResponseBody
public String home(@RequestParam(name = "value", required = false, defaultValue = "") String value) {

    return "Welcome to the String Processing Application";
}

@GetMapping("/stringDedup")
@ResponseBody
public ProcessedString doManip(@RequestParam(name = "value", required = false, defaultValue = "") String value) {

    String result = stringProcessingService.getStringManipulation(value);

    return new ProcessedString(result);

}

@GetMapping("/writeNumber")
@ResponseBody
public ProcessedString getWriteNumber(
        @RequestParam(name = "value", required = false, defaultValue = "") String value) {

    String number = stringProcessingService.getNumberToWords(value);

    return new ProcessedString(number);

} }

在这里ResourceNotFoundException class

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


    private static final long serialVersionUID = 266853955330077478L;

    public ResourceNotFoundException(String exception) {
        super(exception);
    } }

标签： javaspringspring-mvcspring-bootjava-8

解决方案

如果您使用 Spring Boot：

@ControllerAdvice
public class CustomResponseEntityExceptionHandler {

    @ExceptionHandler(value = { NoHandlerFoundException.class })
    public ResponseEntity<Object> noHandlerFoundException(Exception ex) {

        return ResponseEntity.status(HttpStatus.BAD_REQUEST).body("test");
    }
}

或者

@ControllerAdvice
public class CustomResponseEntityExceptionHandler extends ResponseEntityExceptionHandler {

    @Override
    protected ResponseEntity<Object> handleNoHandlerFoundException(
            NoHandlerFoundException ex, HttpHeaders headers, HttpStatus status, WebRequest request) {

        return handleExceptionInternal(ex, "Test", headers, status, request);
    }
}

在org.springframework.web.servlet.DispatcherServlet类中有一个名为 的变量throwExceptionIfNoHandlerFound。如果将其设置为true调用的方法，noHandlerFound则会抛出NoHandlerFoundException. 您的异常处理程序现在将捕获它。

将此属性添加到您的application.properties文件中：spring.mvc.throw-exception-if-no-handler-found=true

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