Java中Spring框架如何处理全局异常

@ControllerAdvice
public class GlobalExceptionHandler {

    @ExceptionHandler(Exception.class)
    public ResponseEntity handleGenericException(Exception e) {
        return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR)
                .body("系统发生错误：" + e.getMessage());
    }

    @ExceptionHandler(NullPointerException.class)
    public ResponseEntity> handleNPE(NullPointerException e) {
        Map response = new HashMap<>();
        response.put("error", "空指针异常");
        response.put("message", e.getMessage());
        response.put("timestamp", System.currentTimeMillis());
        return ResponseEntity.status(HttpStatus.BAD_REQUEST).body(response);
    }
}

public class BizException extends RuntimeException {
    private int code;

    public BizException(int code, String message) {
        super(message);
        this.code = code;
    }

    // getter方法
    public int getCode() { return code; }
}

@ExceptionHandler(BizException.class)
public ResponseEntity> handleBizException(BizException e) {
    Map response = new HashMap<>();
    response.put("code", e.getCode());
    response.put("message", e.getMessage());
    return ResponseEntity.status(HttpStatus.BAD_REQUEST).body(response);
}

if (user == null) {
    throw new BizException(1001, "用户不存在");
}

@RestControllerAdvice
public class ApiGlobalExceptionHandler {

    @ExceptionHandler(IllegalArgumentException.class)
    public Map handleIllegalArgument(IllegalArgumentException e) {
        Map result = new HashMap<>();
        result.put("success", false);
        result.put("msg", "参数不合法");
        result.put("detail", e.getMessage());
        return result;
    }
}