Springboot 统一异常处理和统一返回

实现对controller层的统一异常处理和统一的接口响应返回，以及加入参数校验
整体项目层级：

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1、定义接口响应返回

public class CommonResult<T> {

    private long code;

    private String message;

    private T data;

    public long getCode() {
        return code;
    }

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

    public String getMessage() {
        return message;
    }

    public void setMessage(String message) {
        this.message = message;
    }

    public T getData() {
        return data;
    }

    public void setData(T data) {
        this.data = data;
    }

    protected CommonResult() {
    }

    protected CommonResult(long code, String message, T data) {
        this.code = code;
        this.message = message;
        this.data = data;
    }

    /**
     * 成功返回结果
     *
     * @param data 获取的数据
     */
    public static <T> CommonResult<T> success(T data) {
        return new CommonResult<T>(ResultCode.SUCCESS.getCode(), ResultCode.SUCCESS.getMessage(), data);
    }

    /**
     * 成功返回结果
     *
     * @param data 获取的数据
     * @param  message 提示信息
     */
    public static <T> CommonResult<T> success(T data, String message) {
        return new CommonResult<T>(ResultCode.SUCCESS.getCode(), message, data);
    }

    /**
     * 失败返回结果
     * @param errorCode 错误码
     */
    public static <T> CommonResult<T> failed(IErrorCode errorCode) {
        return new CommonResult<T>(errorCode.getCode(), errorCode.getMessage(), null);
    }

    /**
     * 失败返回结果
     * @param errorCode 错误码
     * @param message 错误信息
     */
    public static <T> CommonResult<T> failed(IErrorCode errorCode,String message) {
        return new CommonResult<T>(errorCode.getCode(), message, null);
    }

    /**
     * 失败返回结果
     * @param message 提示信息
     */
    public static <T> CommonResult<T> failed(String message) {
        return new CommonResult<T>(ResultCode.FAILED.getCode(), message, null);
    }

    /**
     * 失败返回结果
     */
    public static <T> CommonResult<T> failed() {
        return failed(ResultCode.FAILED);
    }

    /**
     * 参数验证失败返回结果
     */
    public static <T> CommonResult<T> validateFailed() {
        return failed(ResultCode.VALIDATE_FAILED);
    }

    /**
     * 参数验证失败返回结果
     * @param message 提示信息
     */
    public static <T> CommonResult<T> validateFailed(String message) {
        return new CommonResult<T>(ResultCode.VALIDATE_FAILED.getCode(), message, null);
    }

    /**
     * 未登录返回结果
     */
    public static <T> CommonResult<T> unauthorized(T data) {
        return new CommonResult<T>(ResultCode.UNAUTHORIZED.getCode(), ResultCode.UNAUTHORIZED.getMessage(), data);
    }

    /**
     * 未授权返回结果
     */
    public static <T> CommonResult<T> forbidden(T data) {
        return new CommonResult<T>(ResultCode.FORBIDDEN.getCode(), ResultCode.FORBIDDEN.getMessage(), data);
    }
}

2、封装错误码

public interface IErrorCode {
    long getCode();

    String getMessage();
}

3、返回错误码统一定义

public enum ResultCode implements IErrorCode {
    SUCCESS(200, "操作成功"),
    FAILED(500, "操作失败"),
    VALIDATE_FAILED(404, "参数检验失败"),
    UNAUTHORIZED(401, "暂未登录或token已经过期"),
    FORBIDDEN(403, "没有相关权限");
    private long code;
    private String message;

    private ResultCode(long code, String message) {
        this.code = code;
        this.message = message;
    }
    @Override
    public long getCode() {
        return code;
    }
    @Override
    public String getMessage() {
        return message;
    }
}

4、自定义异常

public class ApiException extends RuntimeException {
    private IErrorCode errorCode;

    public ApiException(IErrorCode errorCode) {
        super(errorCode.getMessage());
        this.errorCode = errorCode;
    }

    public ApiException(String message) {
        super(message);
    }

    public ApiException(Throwable cause) {
        super(cause);
    }

    public ApiException(String message, Throwable cause) {
        super(message, cause);
    }

    public IErrorCode getErrorCode() {
        return errorCode;
    }
}

5、断言处理类，用于抛出各种API异常

public class Asserts {

    public static void fail(String message) {
        throw new ApiException(message);
    }

    public static void fail(IErrorCode errorCode) {
        throw new ApiException(errorCode);
    }
}

6、全局异常处理

@ControllerAdvice
public class GlobalExceptionHandler {
    @ResponseBody
    @ExceptionHandler(value = ApiException.class)
    public CommonResult handle(ApiException e) {
        if (e.getErrorCode() != null) {
            return CommonResult.failed(e.getErrorCode());
        }
        return CommonResult.failed(e.getMessage());
    }
}

7、日志切面

@Aspect
@Component
@Order(1)
public class WebLogAspect {
    private static final Logger LOGGER = LoggerFactory.getLogger(WebLogAspect.class);

    @Pointcut("execution(public * com.example.portal.controller.*.*(..))")
    public void webLog() {
    }

    @Before("webLog()")
    public void doBefore(JoinPoint joinPoint) throws Throwable {
    }

    @AfterReturning(value = "webLog()", returning = "ret")
    public void doAfterReturning(Object ret) throws Throwable {
    }

    @Around("webLog()")
    public Object doAround(ProceedingJoinPoint joinPoint) throws Throwable {
        long startTime = System.currentTimeMillis();
        //获取当前请求对象
        ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
        HttpServletRequest request = attributes.getRequest();
        WebLog webLog = new WebLog();
        Object result = joinPoint.proceed();
        Signature signature = joinPoint.getSignature();
        MethodSignature methodSignature = (MethodSignature) signature;
        Method method = methodSignature.getMethod();
        if (method.isAnnotationPresent(ApiOperation.class)) {
            ApiOperation log = method.getAnnotation(ApiOperation.class);
            webLog.setDescription(log.value());
        }
        long endTime = System.currentTimeMillis();
        String urlStr = request.getRequestURL().toString();
        webLog.setBasePath(StrUtil.removeSuffix(urlStr, URLUtil.url(urlStr).getPath()));
        webLog.setIp(request.getRemoteUser());
        webLog.setMethod(request.getMethod());
        webLog.setParameter(getParameter(method, joinPoint.getArgs()));
        webLog.setResult(result);
        webLog.setSpendTime((int) (endTime - startTime));
        webLog.setStartTime(startTime);
        webLog.setUri(request.getRequestURI());
        webLog.setUrl(request.getRequestURL().toString());
        Map<String,Object> logMap = new HashMap<>();
        logMap.put("url",webLog.getUrl());
        logMap.put("method",webLog.getMethod());
        logMap.put("parameter",webLog.getParameter());
        logMap.put("spendTime",webLog.getSpendTime());
        logMap.put("description",webLog.getDescription());
        LOGGER.info("{}", JSONUtil.parse(webLog));
        return result;
    }

    /**
     * 根据方法和传入的参数获取请求参数
     */
    private Object getParameter(Method method, Object[] args) {
        List<Object> argList = new ArrayList<>();
        Parameter[] parameters = method.getParameters();
        for (int i = 0; i < parameters.length; i++) {
            //将RequestBody注解修饰的参数作为请求参数
            RequestBody requestBody = parameters[i].getAnnotation(RequestBody.class);
            if (requestBody != null) {
                argList.add(args[i]);
            }
            //将RequestParam注解修饰的参数作为请求参数
            RequestParam requestParam = parameters[i].getAnnotation(RequestParam.class);
            if (requestParam != null) {
                Map<String, Object> map = new HashMap<>();
                String key = parameters[i].getName();
                if (!StringUtils.isEmpty(requestParam.value())) {
                    key = requestParam.value();
                }
                map.put(key, args[i]);
                argList.add(map);
            }
        }
        if (argList.size() == 0) {
            return null;
        } else if (argList.size() == 1) {
            return argList.get(0);
        } else {
            return argList;
        }
    }
}

public class WebLog {
    /**
     * 操作描述
     */
    private String description;

    /**
     * 操作用户
     */
    private String username;

    /**
     * 操作时间
     */
    private Long startTime;

    /**
     * 消耗时间
     */
    private Integer spendTime;

    /**
     * 根路径
     */
    private String basePath;

    /**
     * URI
     */
    private String uri;

    /**
     * URL
     */
    private String url;

    /**
     * 请求类型
     */
    private String method;

    /**
     * IP地址
     */
    private String ip;

    private Object parameter;

    private Object result;

    public String getDescription() {
        return description;
    }

    public void setDescription(String description) {
        this.description = description;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public Long getStartTime() {
        return startTime;
    }

    public void setStartTime(Long startTime) {
        this.startTime = startTime;
    }

    public Integer getSpendTime() {
        return spendTime;
    }

    public void setSpendTime(Integer spendTime) {
        this.spendTime = spendTime;
    }

    public String getBasePath() {
        return basePath;
    }

    public void setBasePath(String basePath) {
        this.basePath = basePath;
    }

    public String getUri() {
        return uri;
    }

    public void setUri(String uri) {
        this.uri = uri;
    }

    public String getUrl() {
        return url;
    }

    public void setUrl(String url) {
        this.url = url;
    }

    public String getMethod() {
        return method;
    }

    public void setMethod(String method) {
        this.method = method;
    }

    public String getIp() {
        return ip;
    }

    public void setIp(String ip) {
        this.ip = ip;
    }

    public Object getParameter() {
        return parameter;
    }

    public void setParameter(Object parameter) {
        this.parameter = parameter;
    }

    public Object getResult() {
        return result;
    }

    public void setResult(Object result) {
        this.result = result;
    }
}

8、校验参数切面

@Aspect
@Component
@Order(2)
public class BindingResultAspect {
    @Pointcut("execution(public * com.example.portal.controller.*.*(..))")
    public void BindingResult() {
    }

    @Around("BindingResult()")
    public Object doAround(ProceedingJoinPoint joinPoint) throws Throwable {
        Object[] args = joinPoint.getArgs();
        for (Object arg : args) {
            if (arg instanceof BindingResult) {
                BindingResult result = (BindingResult) arg;
                if (result.hasErrors()) {
                    FieldError fieldError = result.getFieldError();
                    if(fieldError!=null){
                        return CommonResult.validateFailed(fieldError.getDefaultMessage());
                    }else{
                        return CommonResult.validateFailed();
                    }
                }
            }
        }
        return joinPoint.proceed();
    }
}

9、controller
校验参数需要添加@Valid 注解和BindingResult对象

@RestController
@Slf4j
public class TestController {

    @Autowired
    private TestService testService;
    @RequestMapping(value = "/testQuery", method = RequestMethod.POST)
    @ResponseBody
    public CommonResult testQuery(@RequestBody @Valid TestQueryParam testQueryParam, BindingResult result) {
        Map rsMap=testService.testQuery(testQueryParam.getUsername());
        return CommonResult.success(rsMap);
    }
}

@Data
public class TestQueryParam {
    @ApiModelProperty(value = "用户名", required = true)
    @NotEmpty(message = "用户名不能为空")
    private String username;
    @ApiModelProperty(value = "密码", required = true)
    @NotEmpty(message = "密码不能为空")
    private String password;
}

10、测试结果

image.png

异常处理：

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