注意點(diǎn)：

1. http調(diào)用類需要交spring管理
2. http調(diào)用類與其調(diào)用類不能同類即demoserver與demo不能同類
3. 實(shí)際是通過aop切面完成阻肿，因此http調(diào)用類中不能出現(xiàn)try-catch，沒有異常不會重試
4. @Retryable與@Recover所貼的兩個方法需要同類沮尿，異常類型必須要一致
5. maxAttempts 包括第一次請求的總次數(shù)
6. @Backoff :
   delay 在上一次基礎(chǔ)上*multiplier
   maxDelay 最大重試間隔,默認(rèn)30s,但注解中值為0
   實(shí)際重試間隔取 delay,maxDelay之間的最小值

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

依賴

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

1. 啟動類需要 @EnableRetry
2. 編寫http調(diào)用類丛塌，需要交給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 "失敗";
    }
}

3. 重試超限調(diào)用 -- Exception類型必須與@Retryable的value類型一致

@Recover
    public String test(Exception e) {
        System.out.println("調(diào)用失敗打印日志");
        return "調(diào)用失敗";
    }

4. demo類

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

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

}

文獻(xiàn)： http://www.reibang.com/p/cc7abf831900
https://www.cnblogs.com/zimug/p/13507850.html