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Spring Boot 如何自定义返回错误码错误信息

2019-03-07  本文已影响0人  SuperEngCoding

说明

INTERNAL_SERVER_ERROR(500, "Internal Server Error"),

下面我们来看看如何将我们自定义的错误码和错误信息返回到调用端。

1 自定义错误码

public enum ErrorEnum {
    /*
     * 错误信息
     * */
    E_20011(20011, "缺少必填参数"),

    ;

    private Integer errorCode;
    private String errorMsg;
    ErrorEnum(Integer errorCode, String errorMsg) {
        this.errorCode = errorCode;
        this.errorMsg = errorMsg;
    }
    public Integer getErrorCode() {
        return errorCode;
    }
    public String getErrorMsg() {
        return errorMsg;
    }

2 定义一个异常类

public class BusinessException extends RuntimeException {

    private static final long serialVersionUID = 1L;

    private Integer code;

    /**
     * @param errorEnum 以错误的ErrorEnum做参数
     */
    public BusinessException(ErrorEnum errorEnum) {
        super(errorEnum.getErrorMsg());
        this.code = errorEnum.getErrorCode();
        this.resultJson = CommonUtil.errorJson(errorEnum);
    }
    
    public Integer getCode() {
        return code;
    }

    public void setCode(Integer code) {
        this.code = code;
    }



}

3 定义一个异常返回的模板类

public class ExceptionResponse {

    private String message;
    private Integer code;

    public ExceptionResponse(Integer code, String message) {
        this.message = message;
        this.code = code;
    }

    public static ExceptionResponse create(Integer code, String message) {
        return new ExceptionResponse(code, message);
    }

    public Integer getCode() {
        return code;
    }

    public String getMessage() {
        return message;
    }

}

4 定义全局处理 Controller 层异常

@ControllerAdvice
@Slf4j
public class GlobalExceptionHandler {

    @ResponseBody
    @ResponseStatus(HttpStatus.INTERNAL_SERVER_ERROR)
    @ExceptionHandler(Exception.class)
    public ExceptionResponse handleException(Exception ex) {
        if (ex instanceof BusinessException) {
            log.warn(ex.getMessage(), ex);
            BusinessException businessException = (BusinessException) ex;
            return ExceptionResponse.create(businessException.getCode(), businessException.getMessage());
        } else {
            log.error(ex.getMessage(), ex);
            return ExceptionResponse.create(HttpStatus.INTERNAL_SERVER_ERROR.value(), ex.getMessage());
        }
    }

}

演示效果

@PostMapping("test/exception")
    public String testException() {
        throw new BusinessException(ErrorEnum.E_20011);
    }
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