java封装全局异常处理深入详解

/**
 * 错误代码
 * 错误码
 *
 * @author leovany
 * @date 2023/09/23
 */
public enum ErrorCode {
    SUCCESS(0, "success", ""),
    ERROR_PARAMS(40000, "请求参数错误", ""),
    ERROR_NULL(40001, "请求数据为空", ""),
    ERROR_LOGIN(40100, "未登录", ""),
    ERROR_NO_AUTH(41001, "无权限", ""),
    ERROR_SYSTEM(50000, "系统内部异常", "")
    ;
    /**
     * 错误码ID
     */
    private final int code;
    /**
     * 错误码信息
     */
    private final String message;
    /**
     * 错误码描述（详情）
     */
    private final String description;
    ErrorCode(int code, String message, String description) {
        this.code = code;
        this.message = message;
        this.description = description;
    }
    public int getCode() {
        return code;
    }
    public String getMessage() {
        return message;
    }
    public String getDescription() {
        return description;
    }
}

import com.leovany.usercenter.common.ErrorCode;
/**
 * 业务异常
 * 自定义业务异常类
 *
 * @author leovany
 * @date 2023/09/23
 */
public class BusinessException extends RuntimeException {
    /**
     * 错误码
     */
    private final int code;
    /**
     * 描述
     */
    private final String description;
    /**
     * 业务异常
     *
     * @param message     信息
     * @param code        错误码
     * @param description 描述
     */
    public BusinessException(String message, int code, String description) {
        super(message);
        this.code = code;
        this.description = description;
    }
    /**
     * 业务异常
     *
     * @param errorCode 错误代码
     */
    public BusinessException(ErrorCode errorCode) {
        super(errorCode.getMessage());
        this.code = errorCode.getCode();
        this.description = errorCode.getDescription();
    }
    /**
     * 业务异常
     *
     * @param errorCode   错误代码
     * @param description 描述
     */
    public BusinessException(ErrorCode errorCode, String description) {
        super(errorCode.getMessage());
        this.code = errorCode.getCode();
        this.description = description;
    }
    public int getCode() {
        return code;
    }
    public String getDescription() {
        return description;
    }
}

import com.leovany.usercenter.common.ResultVO;
import com.leovany.usercenter.common.ErrorCode;
import com.leovany.usercenter.common.ResultUtils;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.RestControllerAdvice;
/**
 * 全局异常处理类
 */
@RestControllerAdvice
@Slf4j
public class GlobalExceptionHandler {
    /**
     * 处理异常-BusinessException
     * @param e
     * @return
     */
    @ExceptionHandler(BusinessException.class)
    public ResultVO<?> businessExceptionHandler(BusinessException e){
        log.error("businessException:" + e.getMessage(),e);
        return ResultUtils.error(e.getCode(),e.getMessage(),e.getDescription());
    }
    /**
     * 处理异常-RuntimeException
     * @param e
     * @return
     */
    @ExceptionHandler(RuntimeException.class)
    public ResultVO<?> runtimeExceptionHandler(RuntimeException e){
        log.error("runtimeException:" + e);
        return ResultUtils.error(ErrorCode.ERROR_SYSTEM,e.getMessage());
    }
}

@PostMapping("/login")
public ResultVO<User> userLogin(@RequestBody UserLoginRequest userLoginRequest, HttpServletRequest request) {
    String userAccount = userLoginRequest.getUserAccount();
    String userPassword = userLoginRequest.getUserPassword();
    if (StringUtils.isAnyBlank(userAccount, userPassword)) {
        throw new BusinessException(ErrorCode.ERROR_PARAMS);
    }
    User user = userService.doLogin(userAccount, userPassword, request);
    return ResultUtils.success(user);
}