Redisson文件參考：https://github.com/redisson/redisson/wiki/%E7%9B%AE%E5%BD%95

開始引入

pom檔案中引入依賴：

<!-- redisson 分散式鎖實現 -->
<dependency>
    <groupId>org.redisson</groupId>
    <artifactId>redisson</artifactId>
    <version>3.8.2</version>
</dependency>
 

spring中配置：

　　引入約束：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
   xmlns:tx="http://www.springframework.org/schema/tx" xmlns:aop="http://www.springframework.org/schema/aop"
 

       xmlns:redisson="http://redisson.org/schema/redisson"
   xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
    http://www.springframework.org/schema/context
    http://www.springframework.org/schema/context/spring-context-2.5.xsd
    http://www.springframework.org/schema/tx 
    http://www.springframework.org/schema/tx/spring-tx-2.5.xsd
    http://www.springframework.org/schema/aop
    http://www.springframework.org/schema/aop/spring-aop-2.5.xsd
    http://redisson.org/schema/redisson
 

    http://redisson.org/schema/redisson/redisson.xsd"
   default-lazy-init="true">

         測試staging環境：

<!-- redisson 客戶端 配置實現 -->
<redisson:client id="redissonClient">
    <redisson:cluster-servers password="${password}">
        <redisson:node-address value="redis://127.0.0.1:6600"/>
        <redisson:node-address value="redis://127.0.0.1:6601"/>
        <redisson:node-address value="redis://127.0.0.1:6602"/>
    </redisson:cluster-servers>
</redisson:client>

         生產production環境：

<!-- redisson 客戶端 配置實現 -->
<redisson:client id="redissonClient">
    <redisson:cluster-servers password="${password}">
        <redisson:node-address value="redis://127.0.0.1:6602"/>
        <redisson:node-address value="redis://127.0.0.1:6603"/>
        <redisson:node-address value="redis://127.0.0.2:6602"/>
        <redisson:node-address value="redis://127.0.0.2:6603"/>
        <redisson:node-address value="redis://127.0.0.3:6602"/>
        <redisson:node-address value="redis://127.0.0.3:6603"/>
    </redisson:cluster-servers>
</redisson:client>

業務中使用：

public class LockBiz {

    @Autowired
    RedissonClient redissonClient;

    public boolean doWithLock(long groupId, OperateType operateType, String operator, List<Config> configList) {
        boolean isLocked = false;
        String lockName = "fi_config_groupid_" + groupId;
        RLock lock = redissonClient.getLock(lockName);
        if (lock == null) {
            log.error("lock is null");
            return false;
        }

        try {
            try {
                boolean lockedState = lock.isLocked();
                if (lockedState) {
                    log.error("lock_redisson state seems already locked: {}, name of lock is: {}", lockedState, lockName);
                }
                for (int i = 0; i < Constants.TRY_TIMES; ++i) {
                    isLocked = lock.tryLock(Constants.TRY_LOCK_TIME, Constants.AUTO_UNLOCK_TIMES, Constants.LOCK_TIME_UNIT);
                    log.info("lock_redisson result: {}, try times: {}, time consuming: {}", isLocked, (i+1), (System.currentTimeMillis() - startLock));
                    if (isLocked) {
                        break;
                    }
                }
            } catch (InterruptedException e) {
                log.error("failed to get lock_redisson: ", e);
            }
            if (!isLocked) {
                log.error("try lock_redisson failed");
            }
            /**
             加鎖成功，處理業務邏輯
             */
        } finally {
            if (isLocked) {
                try {
                    lock.unlock();
                } catch (Throwable t) {
                    log.error("failed to unlock_redisson, {}", ExceptionUtils.getStackTrace(t));
                }
            }
        }
    }

}

注意事項：

　　1. redisson的2版本和3版本在配置redis地址的時候貌似不一致，2版本無需字首“redis://”，而3版本需要；

　　2. getLock時，RLock lock = redissonClient.getLock(lockName);  這個lockName一定要唯一，redisson應該是將這個lockName同時作為lock的name和key的名稱，如果和別人重複了，就需要和別人競爭同一把鎖了，而不是自己的業務和自己的業務競爭鎖了。（今天就出現了個問題，我把lockName設定為2，經常會出現加鎖失敗，並且是在迴圈加鎖之前 這把鎖就已經鎖上了，現在想想應該是別人在其他地方給redis中添加了個key=2的，導致我無法加鎖，排查了挺長時間）