基于spring boot实现一个全局异常处理器

package com.xiaojuan.boot.common.web.support;
import ...
import static com.xiaojuan.boot.common.enums.BusinessError.*;
@Slf4j
@RestControllerAdvice
public class GlobalExceptionHandler {
    /** 维护一个错误码与http状态码的映射 */
    private Map<Integer, HttpStatus> httpStatusMap;
    @PostConstruct
    private void init() {
        httpStatusMap = new HashMap<>();
        httpStatusMap.put(NO_LOGIN.getValue(), HttpStatus.UNAUTHORIZED);
        httpStatusMap.put(HAS_NO_ROLE.getValue(), HttpStatus.FORBIDDEN);
    }
    @ExceptionHandler(BusinessException.class)
    public ResponseEntity<Response<?>> handleException(BusinessException ex) {
        log.error(ex.getMessage(), ex);
        // 默认服务器端错误，返回500状态码
        HttpStatus status = HttpStatus.INTERNAL_SERVER_ERROR;
        if (!StringUtils.isEmpty(ex.getErrCode()) && httpStatusMap.containsKey(ex.getErrCode())) {
            status = httpStatusMap.get(ex.getErrCode());
        }
        return ResponseEntity.status(status).body(Response.fail(ex.getMessage(), ex.getErrCode(), ex.getData()));
    }
    @ExceptionHandler(Exception.class)
    public ResponseEntity<Response<?>> handleException(Exception ex) {
        log.error(ex.getMessage(), ex);
        return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).body(Response.fail("小卷生鲜电商系统异常：" + ex.getMessage()));
    }
}

package com.xiaojuan.boot.common.enums;
import ...
@Getter
@AllArgsConstructor
public enum BusinessError {
    PARAM_INVALID("参数校验失败", 10001),
    RECORD_EXISTS("后台记录已存在", 10002),
    HAS_NO_ROLE("用户未授权，不能访问", 403),
    NO_LOGIN("请先登录再操作", 401);
    private final String label;
    private final Integer value;
}

package com.xiaojuan.boot.util;
import ...
public class Assert {
    public static void hasText(@Nullable String text, String message) {
        if (!StringUtils.hasText(text)) {
            throw new BusinessException(message, BusinessError.PARAM_INVALID.getValue());
        }
    }
}