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這篇文章給大家介紹怎么在SpringBoot中利用Redisson實現一個分布式鎖，內容非常詳細，感興趣的小伙伴們可以參考借鑒，希望對大家能有所幫助。
項目代碼結構圖：
導入依賴
<dependency> <groupId>org.redisson</groupId> <artifactId>redisson</artifactId> <version>3.8.0</version> </dependency>
屬性配置
在 application.properites 資源文件中添加單機&哨兵相關配置
server.port=3000 # redisson lock 單機模式 redisson.address=redis://127.0.0.1:6379 redisson.password= #哨兵模式 #redisson.master-name= master #redisson.password= #redisson.sentinel-addresses=10.47.91.83:26379,10.47.91.83:26380,10.47.91.83:26381
注意：
這里如果不加 redis:// 前綴會報 URI 構建錯誤
Caused by: java.net.URISyntaxException: Illegal character in scheme name at index 0
更多的配置信息可以去官網查看
定義Lock的接口定義類
package com.tuhu.thirdsample.service;
import org.redisson.api.RLock;
import java.util.concurrent.TimeUnit;
/**
* @author chendesheng
* @create 2019/10/12 10:48
*/
public interface DistributedLocker {
RLock lock(String lockKey);
RLock lock(String lockKey, int timeout);
RLock lock(String lockKey, TimeUnit unit, int timeout);
boolean tryLock(String lockKey, TimeUnit unit, int waitTime, int leaseTime);
void unlock(String lockKey);
void unlock(RLock lock);
}Lock接口實現類
package com.tuhu.thirdsample.service;
import org.redisson.api.RLock;
import org.redisson.api.RedissonClient;
import java.util.concurrent.TimeUnit;
/**
* @author chendesheng
* @create 2019/10/12 10:49
*/
public class RedissonDistributedLocker implements DistributedLocker{
private RedissonClient redissonClient;
@Override
public RLock lock(String lockKey) {
RLock lock = redissonClient.getLock(lockKey);
lock.lock();
return lock;
}
@Override
public RLock lock(String lockKey, int leaseTime) {
RLock lock = redissonClient.getLock(lockKey);
lock.lock(leaseTime, TimeUnit.SECONDS);
return lock;
}
@Override
public RLock lock(String lockKey, TimeUnit unit ,int timeout) {
RLock lock = redissonClient.getLock(lockKey);
lock.lock(timeout, unit);
return lock;
}
@Override
public boolean tryLock(String lockKey, TimeUnit unit, int waitTime, int leaseTime) {
RLock lock = redissonClient.getLock(lockKey);
try {
return lock.tryLock(waitTime, leaseTime, unit);
} catch (InterruptedException e) {
return false;
}
}
@Override
public void unlock(String lockKey) {
RLock lock = redissonClient.getLock(lockKey);
lock.unlock();
}
@Override
public void unlock(RLock lock) {
lock.unlock();
}
public void setRedissonClient(RedissonClient redissonClient) {
this.redissonClient = redissonClient;
}
}redisson屬性裝配類
package com.tuhu.thirdsample.common;
import lombok.Data;
import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Configuration;
/**
* @author chendesheng
* @create 2019/10/11 20:04
*/
@Configuration
@ConfigurationProperties(prefix = "redisson")
@ConditionalOnProperty("redisson.password")
@Data
public class RedissonProperties {
private int timeout = 3000;
private String address;
private String password;
private int database = 0;
private int connectionPoolSize = 64;
private int connectionMinimumIdleSize=10;
private int slaveConnectionPoolSize = 250;
private int masterConnectionPoolSize = 250;
private String[] sentinelAddresses;
private String masterName;
}SpringBoot自動裝配類
package com.tuhu.thirdsample.configuration;
import com.tuhu.thirdsample.common.RedissonProperties;
import com.tuhu.thirdsample.service.DistributedLocker;
import com.tuhu.thirdsample.service.RedissonDistributedLocker;
import com.tuhu.thirdsample.util.RedissonLockUtil;
import org.apache.commons.lang3.StringUtils;
import org.redisson.Redisson;
import org.redisson.api.RedissonClient;
import org.redisson.config.Config;
import org.redisson.config.SentinelServersConfig;
import org.redisson.config.SingleServerConfig;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
/**
* @author chendesheng
* @create 2019/10/12 10:50
*/
@Configuration
@ConditionalOnClass(Config.class)
@EnableConfigurationProperties(RedissonProperties.class)
public class RedissonAutoConfiguration {
@Autowired
private RedissonProperties redissonProperties;
/**
* 哨兵模式自動裝配
* @return
*/
@Bean
@ConditionalOnProperty(name="redisson.master-name")
RedissonClient redissonSentinel() {
Config config = new Config();
SentinelServersConfig serverConfig = config.useSentinelServers().addSentinelAddress(redissonProperties.getSentinelAddresses())
.setMasterName(redissonProperties.getMasterName())
.setTimeout(redissonProperties.getTimeout())
.setMasterConnectionPoolSize(redissonProperties.getMasterConnectionPoolSize())
.setSlaveConnectionPoolSize(redissonProperties.getSlaveConnectionPoolSize());
if(StringUtils.isNotBlank(redissonProperties.getPassword())) {
serverConfig.setPassword(redissonProperties.getPassword());
}
return Redisson.create(config);
}
/**
* 單機模式自動裝配
* @return
*/
@Bean
@ConditionalOnProperty(name="redisson.address")
RedissonClient redissonSingle() {
Config config = new Config();
SingleServerConfig serverConfig = config.useSingleServer()
.setAddress(redissonProperties.getAddress())
.setTimeout(redissonProperties.getTimeout())
.setConnectionPoolSize(redissonProperties.getConnectionPoolSize())
.setConnectionMinimumIdleSize(redissonProperties.getConnectionMinimumIdleSize());
if(StringUtils.isNotBlank(redissonProperties.getPassword())) {
serverConfig.setPassword(redissonProperties.getPassword());
}
return Redisson.create(config);
}
/**
* 裝配locker類，并將實例注入到RedissLockUtil中
* @return
*/
@Bean
DistributedLocker distributedLocker(RedissonClient redissonClient) {
DistributedLocker locker = new RedissonDistributedLocker();
((RedissonDistributedLocker) locker).setRedissonClient(redissonClient);
RedissonLockUtil.setLocker(locker);
return locker;
}
}Lock幫助類
package com.tuhu.thirdsample.util;
import com.tuhu.thirdsample.service.DistributedLocker;
import org.redisson.api.RLock;
import java.util.concurrent.TimeUnit;
/**
* @author chendesheng
* @create 2019/10/12 10:54
*/
public class RedissonLockUtil {
private static DistributedLocker redissLock;
public static void setLocker(DistributedLocker locker) {
redissLock = locker;
}
/**
* 加鎖
* @param lockKey
* @return
*/
public static RLock lock(String lockKey) {
return redissLock.lock(lockKey);
}
/**
* 釋放鎖
* @param lockKey
*/
public static void unlock(String lockKey) {
redissLock.unlock(lockKey);
}
/**
* 釋放鎖
* @param lock
*/
public static void unlock(RLock lock) {
redissLock.unlock(lock);
}
/**
* 帶超時的鎖
* @param lockKey
* @param timeout 超時時間 單位：秒
*/
public static RLock lock(String lockKey, int timeout) {
return redissLock.lock(lockKey, timeout);
}
/**
* 帶超時的鎖
* @param lockKey
* @param unit 時間單位
* @param timeout 超時時間
*/
public static RLock lock(String lockKey, TimeUnit unit , int timeout) {
return redissLock.lock(lockKey, unit, timeout);
}
/**
* 嘗試獲取鎖
* @param lockKey
* @param waitTime 最多等待時間
* @param leaseTime 上鎖后自動釋放鎖時間
* @return
*/
public static boolean tryLock(String lockKey, int waitTime, int leaseTime) {
return redissLock.tryLock(lockKey, TimeUnit.SECONDS, waitTime, leaseTime);
}
/**
* 嘗試獲取鎖
* @param lockKey
* @param unit 時間單位
* @param waitTime 最多等待時間
* @param leaseTime 上鎖后自動釋放鎖時間
* @return
*/
public static boolean tryLock(String lockKey, TimeUnit unit, int waitTime, int leaseTime) {
return redissLock.tryLock(lockKey, unit, waitTime, leaseTime);
}
}控制層
package com.tuhu.thirdsample.task;
import com.tuhu.thirdsample.common.KeyConst;
import lombok.extern.slf4j.Slf4j;
import org.redisson.api.RLock;
import org.redisson.api.RedissonClient;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import java.util.concurrent.TimeUnit;
/**
* @author chendesheng
* @create 2019/10/12 11:03
*/
@RestController
@RequestMapping("/lock")
@Slf4j
public class LockController {
@Autowired
RedissonClient redissonClient;
@GetMapping("/task")
public void task(){
log.info("task start");
RLock lock = redissonClient.getLock(KeyConst.REDIS_LOCK_KEY);
boolean getLock = false;
try {
if (getLock = lock.tryLock(0,5,TimeUnit.SECONDS)){
//執行業務邏輯
System.out.println("拿到鎖干活");
}else {
log.info("Redisson分布式鎖沒有獲得鎖:{},ThreadName:{}",KeyConst.REDIS_LOCK_KEY,Thread.currentThread().getName());
}
} catch (InterruptedException e) {
log.error("Redisson 獲取分布式鎖異常,異常信息:{}",e);
}finally {
if (!getLock){
return;
}
//如果演示的話需要注釋該代碼;實際應該放開
//lock.unlock();
//log.info("Redisson分布式鎖釋放鎖:{},ThreadName :{}", KeyConst.REDIS_LOCK_KEY, Thread.currentThread().getName());
}
}
}RLock 繼承自 java.util.concurrent.locks.Lock ，可以將其理解為一個重入鎖，需要手動加鎖和釋放鎖 。
來看它其中的一個方法：tryLock(long waitTime, long leaseTime, TimeUnit unit)
getLock = lock.tryLock(0,5,TimeUnit.SECONDS)
通過 tryLock() 的參數可以看出，在獲取該鎖時如果被其他線程先拿到鎖就會進入等待，等待 waitTime 時間，如果還沒用機會獲取到鎖就放棄，返回 false；若獲得了鎖，除非是調用 unlock 釋放，那么會一直持有鎖，直到超過 leaseTime 指定的時間。
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