lombok 使用及技巧

@AllArgsConstructor替代@Autowired构造注入,多个bean 注入时更加清晰L

@Slf4j
@Configuration
@AllArgsConstructor
public class RouterFunctionConfiguration {
   private final HystrixFallbackHandler hystrixFallbackHandler;
   private final ImageCodeHandler imageCodeHandler;
   
}


@Slf4j
@Configuration
public class RouterFunctionConfiguration {
   @Autowired
   private  HystrixFallbackHandler hystrixFallbackHandler;
   @Autowired
   private  ImageCodeHandler imageCodeHandler;
}

@RequiredArgsConstructor相较于 @AllArgsConstructor  只会构造注入 final 注释的属性，推荐使用

@RestController
@RequiredArgsConstructor
@RequestMapping("/user")
@Api(value = "user", tags = "用户管理模块")
public class SysUserController {

	private final SysUserService userService;
}

 @SneakyThrows 抛出异常

@SneakyThrows
private void checkCode(ServerHttpRequest request) {
   String code = request.getQueryParams().getFirst("code");

   if (StrUtil.isBlank(code)) {
   	throw new ValidateCodeException("验证码不能为空");
   }

   redisTemplate.delete(key);
}


// 不使用就要加这个抛出
private void checkCode(ServerHttpRequest request) throws ValidateCodeException {
   String code = request.getQueryParams().getFirst("code");

   if (StrUtil.isBlank(code)) {
   	throw new ValidateCodeException("验证码不能为空");
   }
}

@UtilityClass工具类再也不用定义static的方法了，直接就可以Class.Method 使用 

@UtilityClass
public class Utility {

    public String getName() {
        return "name";
    }
}

public static void main(String[] args) {
    System.out.println(Utility.getName());
}

@Cleanup: 清理流对象,不用手动去关闭流，多么优雅

@Cleanup
OutputStream outStream = new FileOutputStream(new File("text.txt"));
@Cleanup
InputStream inStream = new FileInputStream(new File("text2.txt"));
byte[] b = new byte[65536];
while (true) {
   int r = inStream.read(b);
   if (r == -1) break;
   outStream.write(b, 0, r); 
}