Springboot重试机制Spring Retry

一、引入maven依赖

		
			org.springframework.retry
			spring-retry
		
		
			org.aspectj
			aspectjweaver
		

二、springboot启动类添加@EnableRetry注解

@SpringBootApplication()
@ComponentScan(value = "com.cn.**")
@EnableScheduling
@EnableRetry
public class StartApplication {
    public static void main(String[] args) {
        SpringApplication.run(LsMsapFhApplication.class, args);

    }
}

三、异常重试部分加入注解@Retryable

import org.springframework.retry.annotation.Backoff;
import org.springframework.retry.annotation.Retryable;
import org.springframework.stereotype.Service;

import java.net.SocketException;

@Service
public class UserService {


    @Retryable(value = {SocketException.class, Exception.class}, maxAttempts = 3, backoff = @Backoff(delay = 2000, multiplier = 1.5))

    public void getUser(int userId) {

        try {
            System.out.println("getUser...........");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

详解:

value:指定捕捉到的异常才进行重试,可设置多个
maxAttempts:重试次数
backoff:
delay=2000 :出现异常 延迟两秒后重试
multiplier=1.5:第N次重试是上一次重试延迟时间的1.5倍(第一次2秒,第二次就是3秒,第三次就是6秒.....)

注意:必须是@Service 或者@Component注解 注释的类才可使用

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