禁止血压飙升！阿里大佬写的Controller太优雅了~

😰那些让人血压飙升的Controller

一个不优雅的Controller

@RestController@RequestMapping("/user/test")public class UserController {
    private static Logger logger = LoggerFactory.getLogger(UserController.class);
    @Autowired    private UserService userService;
    @Autowired    private AuthService authService;
    @PostMapping    public CommonResult userRegistration(@RequestBody UserVo userVo) {        if (StringUtils.isBlank(userVo.getUsername())) {            return CommonResult.error("用户名不能为空");        }        if (StringUtils.isBlank(userVo.getPassword())) {            return CommonResult.error("密码不能为空");        }        logger.info("注册用户：{}", userVo.getUsername());        try {            userService.registerUser(userVo.getUsername());            return CommonResult.ok();        } catch (Exception e) {            logger.error("注册用户失败：{}", userVo.getUsername(), e);            return CommonResult.error("注册失败");        }    }}

优雅的Controller编写技巧

1. 使用Spring的@Valid注解进行校验

@RestController@RequestMapping("/user/test")public class UserController {
    private static Logger logger = LoggerFactory.getLogger(UserController.class);
    @Autowired    private UserService userService;
    @Autowired    private AuthService authService;
    @PostMapping("/userRegistration")    public CommonResult userRegistration(@RequestBody @Valid UserVo userVo) {        userService.registerUser(userVo.getUsername());        return CommonResult.ok();    }}

2. 实体类中的参数校验注解

@ApiModel(value = "管理后台 - 账号密码登录 Request VO")@Data@NoArgsConstructor@AllArgsConstructor@Builderpublic class AuthLoginReqVO {
    @ApiModelProperty(value = "账号", required = true, example = "user")    @NotEmpty(message = "登录账号不能为空")    @Length(min = 4, max = 16, message = "账号长度为4-16位")    @Pattern(regexp = "^[A-Za-z0-9]+$", message = "账号格式为数字和字母")    private String username;
    @ApiModelProperty(value = "密码", required = true, example = "password")    @NotEmpty(message = "密码不能为空")    @Length(min = 4, max = 16, message = "密码长度为4-16位")    private String password;}

3. 全局异常处理

@ResponseBody@RestControllerAdvicepublic class ExceptionHandlerAdvice {    protected Logger logger = LoggerFactory.getLogger(getClass());
    @ExceptionHandler(MethodArgumentNotValidException.class)    public CommonResult<Object> handleValidationExceptions(MethodArgumentNotValidException ex) {        logger.error("[handleValidationExceptions]", ex);        StringBuilder sb = new StringBuilder();        ex.getBindingResult().getAllErrors().forEach(error -> {            String fieldName = ((org.springframework.validation.FieldError) error).getField();            String errorMessage = error.getDefaultMessage();            sb.append(fieldName).append(":").append(errorMessage).append(";");        });        return CommonResult.error(sb.toString());    }
    @ExceptionHandler(value = Exception.class)    public CommonResult<?> defaultExceptionHandler(Throwable ex) {        logger.error("[defaultExceptionHandler]", ex);        return CommonResult.error("系统错误，请稍后重试");    }}

Controller的职责与界限

结束语

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