你必须得会的SpringBoot全局统一处理异常详解

@Slf4j
@RestControllerAdvice
public class GlobalExceptionHandler {
    private Map<String, Object> getResult(ErrorCodeEnum e, boolean status) {
        Map<String, Object> map = new HashMap<>();
        map.put("success", status);
        map.put("code", e.getKey());
        map.put("msg", e.getValue());
        return map;
    }
    /**
     * 参数校验不通过
     *
     * @param e       异常信息
     * @param request 请求信息
     */
    @ExceptionHandler(value = ParamsException.class)
    @ResponseStatus(HttpStatus.OK)
    public Map<String, Object> handleObjectExistException(ParamsException e,
                                                          HttpServletRequest request) {
        return getResult(ErrorCodeEnum.PARAM_EXIST_EXCEPTION, false);
    }
    /**
     * 用户校验不通过
     *
     * @param e       异常信息
     * @param request 请求信息
     */
    @ResponseStatus(HttpStatus.OK)
    @ExceptionHandler(value = TokenExpireException.class)
    public Map<String, Object> handle(TokenExpireException e, HttpServletRequest request) {
        return getResult(ErrorCodeEnum.USER_NOT_LOGIN, false);
    }
    /**
     * 全局异常处理
     *
     * @param e       异常信息
     * @param request 请求信息
     */
    @ResponseStatus()
    @ExceptionHandler(value = Throwable.class)
    public Map<String, Object> handle(Exception e, HttpServletRequest request) {
        return getResult(ErrorCodeEnum.SYSTEM_ERROR, false);
    }
}

public class ParamsException extends RuntimeException {
    private static final long serialVersionUID = 1L;
    private String message;
    public ParamsException() {
    }
    public ParamsException(String msg) {
        this.message = msg;
    }
    public ParamsException(ErrorCodeEnum e) {
        this.message = e.getValue();
    }
    @Override
    public String getMessage() {
        return message;
    }
    public void setMessage(String message) {
        this.message = message;
    }
}

package com.example.demo.exception;
import com.example.demo.enums.ErrorCodeEnum;
/**
 * 用户登陆信息过期异常
 */
public class TokenExpireException extends RuntimeException {
    private static final long serialVersionUID = 1L;
    private String message;
    public TokenExpireException() {
    }
    public TokenExpireException(String msg) {
        this.message = msg;
    }
    public TokenExpireException(ErrorCodeEnum e) {
        this.message = e.getValue();
    }
    @Override
    public String getMessage() {
        return message;
    }
    public void setMessage(String message) {
        this.message = message;
    }
}

@RestController
@RequestMapping("/exception")
@Api(tags = "全局异常测试模块", description = "全局异常测试模块")
public class ExceptionController {
    @Autowired
    private UserService userService;
    /**
     * 根据用户id查询用户信息
     */
    @GetMapping("/find-user-by-id")
    @ApiOperation(value = "根据用户id查询用户信息", notes = "根据用户id查询用户信息")
    public ResultResponse<UserEntity> saveUser(@RequestParam("userId") String userId) throws ParamsException {
        if (StringUtils.isBlank(userId)) {
            throw new ParamsException(PARAM_EXIST_EXCEPTION);
        }
        return new ResultResponse<>(userService.getById(userId));
    }
}

    @GetMapping("/login")
    @ApiOperation(value = "登录", notes = "登录")
    public ResultResponse<Boolean> login(@RequestParam("token") String token) throws TokenExpireException {
        throw new TokenExpireException();
    }

/**
 * 接口返回错误码枚举
 */
public enum ErrorCodeEnum implements IEnum {
    /* 系统异常 */
    SYSTEM_RUNNING(100000, "系统运行异常"),
    SYSTEM_ERROR(101000, "系统未知异常"),
    PARAM_EXIST_EXCEPTION(101001, "参数异常"),
    /* token相关 */
    TOKEN_IS_EMPTY(102001, "该请求没有携带token！请先获取token"),
    TOKEN_IS_INVALID(102002, "token失效，请重新登录！"),
    TOKEN_IS_ERROR(102003, "非法token！请重新登录！"),
    USER_NOT_LOGIN(103006, "请先登录"),
    ;
    private Integer key;
    private String value;
    ErrorCodeEnum(Integer key, String value) {
        this.key = key;
        this.value = value;
    }
    @Override
    public Integer getKey() {
        return this.key;
    }
    @Override
    public String getValue() {
        return this.value;
    }
}