注意点：

1. http调用类需要交spring管理
2. http调用类与其调用类不能同类即demoserver与demo不能同类
3. 实际是通过aop切面完成，因此http调用类中不能出现try-catch，没有异常不会重试
4. @Retryable与@Recover所贴的两个方法需要同类，异常类型必须要一致
5. maxAttempts 包括第一次请求的总次数
6. @Backoff :
   delay 在上一次基础上*multiplier
   maxDelay 最大重试间隔,默认30s,但注解中值为0
   实际重试间隔取 delay,maxDelay之间的最小值

@Retryable(value = Exception.class, maxAttempts = 6, backoff = @Backoff(delay = 10000L,maxDelay = 60*60*1000L, multiplier = 2))

依赖

<!--        需要依赖aspectjweaver-->
       <dependency>
            <groupId>org.springframework.retry</groupId>
            <artifactId>spring-retry</artifactId>
        </dependency>
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
        </dependency>

1. 启动类需要 @EnableRetry
2. 编写http调用类，需要交给spring管理 @Service

package com.example.kafkademo.demo;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpEntity;
import org.springframework.http.HttpHeaders;
import org.springframework.http.MediaType;
import org.springframework.retry.annotation.Backoff;
import org.springframework.retry.annotation.Retryable;
import org.springframework.stereotype.Service;
import org.springframework.web.client.RestTemplate;

@Service
public class DemoService {
    @Autowired
    private RestTemplate restTemplate ;
    @Retryable(value = Exception.class,maxAttempts = 5,backoff = @Backoff(delay = 1000L,multiplier=1))
    public String test(){
        HttpHeaders headers = new HttpHeaders();
        headers.setContentType(MediaType.APPLICATION_JSON);
        HttpEntity httpEntity = new HttpEntity("{'data':'消息'}",headers);
        restTemplate.postForEntity("http://www.baidu.com",httpEntity,Object.class);
        return "失败";
    }
}

3. 重试超限调用 -- Exception类型必须与@Retryable的value类型一致

@Recover
    public String test(Exception e) {
        System.out.println("调用失败打印日志");
        return "调用失败";
    }

4. demo类

@RestController
@RequestMapping
public class Demo {
@Autowired
private DemoService service;

    @RequestMapping("/demo")
    public  String send(){
        service.test();
        return null;
    }

}

文献： https://www.jianshu.com/p/cc7abf831900
https://www.cnblogs.com/zimug/p/13507850.html