本文介绍了Spring重试支持Spring Retry的方法，分享给大家，具体如下：
第一步、引入maven依赖
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
|
<parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>1.5.3.RELEASE</version></parent><dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId></dependency><!-- https://mvnrepository.com/artifact/org.springframework.retry/spring-retry --><dependency> <groupId>org.springframework.retry</groupId> <artifactId>spring-retry</artifactId> <version>1.1.2.RELEASE</version></dependency><dependency> <groupId>org.aspectj</groupId> <artifactId>aspectjweaver</artifactId> <version>1.8.6</version></dependency> |
第二步、添加@Retryable和@Recover注解
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
|
package hello;import org.springframework.remoting.RemoteAccessException;import org.springframework.retry.annotation.Backoff;import org.springframework.retry.annotation.Recover;import org.springframework.retry.annotation.Retryable;import org.springframework.stereotype.Service;@Servicepublic class RemoteService {@Retryable(value= {RemoteAccessException.class},maxAttempts = 3,backoff = @Backoff(delay = 5000l,multiplier = 1))public void call() throws Exception { System.out.println("do something..."); throw new RemoteAccessException("RPC调用异常");}@Recoverpublic void recover(RemoteAccessException e) { System.out.println(e.getMessage());}} |
@Retryable注解
被注解的方法发生异常时会重试
value:指定发生的异常进行重试
include:和value一样，默认空，当exclude也为空时，所有异常都重试
exclude:指定异常不重试，默认空，当include也为空时，所有异常都重试
maxAttemps:重试次数，默认3
backoff:重试补偿机制，默认没有
@Backoff注解
delay:指定延迟后重试
multiplier:指定延迟的倍数，比如delay=5000l,multiplier=2时，第一次重试为5秒后，第二次为10秒，第三次为20秒
@Recover
当重试到达指定次数时，被注解的方法将被回调，可以在该方法中进行日志处理。需要注意的是发生的异常和入参类型一致时才会回调
第三步、SpringBoot方式启动容器、测试
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
|
package hello;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.context.ApplicationContext;import org.springframework.context.annotation.AnnotationConfigApplicationContext;import org.springframework.retry.annotation.EnableRetry;@SpringBootApplication@EnableRetrypublic class Application { public static void main(String[] args) throws Exception { ApplicationContext annotationContext = new AnnotationConfigApplicationContext("hello"); RemoteService remoteService = annotationContext.getBean("remoteService", RemoteService.class); remoteService.call(); }} |
运行结果：
16:50:51.012 [main] DEBUG org.springframework.retry.support.RetryTemplate - Retry: count=0
do something…
16:50:51.025 [main] DEBUG org.springframework.retry.backoff.ExponentialBackOffPolicy - Sleeping for 5000
16:50:56.026 [main] DEBUG org.springframework.retry.support.RetryTemplate - Checking for rethrow: count=1
16:50:56.026 [main] DEBUG org.springframework.retry.support.RetryTemplate - Retry: count=1
do something…
16:50:56.026 [main] DEBUG org.springframework.retry.backoff.ExponentialBackOffPolicy - Sleeping for 5000
16:51:01.026 [main] DEBUG org.springframework.retry.support.RetryTemplate - Checking for rethrow: count=2
16:51:01.027 [main] DEBUG org.springframework.retry.support.RetryTemplate - Retry: count=2
do something…
16:51:01.027 [main] DEBUG org.springframework.retry.support.RetryTemplate - Checking for rethrow: count=3
16:51:01.027 [main] DEBUG org.springframework.retry.support.RetryTemplate - Retry failed last attempt: count=3
RPC调用异常
参考 ：https://github.com/spring-projects/spring-retry
补充
对于非幂等的请求（比如新增，更新操作），千万不要使用重试，对数据一致性会造成很大影响。
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：https://blog.csdn.net/u014513883/article/details/52371198
