Spring Boot @ExceptionHandler 隐藏异常名称

使用Spring Boot的@ExceptionHandler注解可以很方便地处理应用程序中的异常情况。通过对异常进行捕获和处理，我们可以提供更友好的错误信息给用户，并且保护应用程序的稳定性。然而，有时候我们可能不想将具体的异常信息暴露给用户，而是希望隐藏异常的名称，以增加系统的安全性。本文将介绍如何 一篇关于隐藏Spring Boot @ExceptionHandler异常名称的文章，并提供相关的案例代码。

java
public class BusinessException extends RuntimeException {
    private String message;
    public BusinessException(String message) {
        this.message = message;
    }
    public String getMessage() {
        return message;
    }
}

java
@RestController
public class DemoController {
    @GetMapping("/test")
    public void test() {
        throw new BusinessException("This is a business exception.");
    }
}

java
@Component
public class CustomExceptionHandler implements HandlerExceptionResolver {
    @Override
    public ModelAndView resolveException(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) {
        if (ex instanceof BusinessException) {
            BusinessException businessException = (BusinessException) ex;
            // 隐藏异常名称，只返回自定义的错误信息
            String errorMessage = businessException.getMessage();
            // 返回自定义的错误信息给用户
            response.setStatus(HttpStatus.BAD_REQUEST.value());
            response.setContentType(MediaType.APPLICATION_JSON_VALUE);
            try {
                response.getWriter().write("{\"error\":\"" + errorMessage + "\"}");
            } catch (IOException e) {
                e.printStackTrace();
            }
            return new ModelAndView();
        }
        return null;
    }
}

shell
GET /test HTTP/1.1
Host: localhost:8080
Content-Type: application/json
HTTP/1.1 400 
Content-Type: application/json
{
  "error": "This is a business exception."
}