springboot整合redisson分布式锁（redis集群模式）

Love The Way You Lie 2022-05-17 11:06 261阅读 0赞

1.maven引入redisson

<dependency>
                <groupId>org.redisson</groupId>
                <artifactId>redisson</artifactId>
                <version>3.5.0</version>
            </dependency>

2.redisson配置类，得到redisson对象，之后的分布式锁由redisson对象操作

2.1 在springboot的配置文件application.yml中添加redis集群的ip和端口还有密码

spring:
    	redis:
    		password: 123456
    		clusters: 10.10.1.1:7000,10.10.1.1:7001,10.10.1.1:7002,10.10.1.1:7003,10.10.1.1:7004,10.10.1.1:7005

2.2 创建 redisson配置类RedissonManager

import java.io.IOException;
    import org.redisson.Redisson;
    import org.redisson.api.RedissonClient;
    import org.redisson.config.Config;
    import org.springframework.beans.factory.annotation.Value;
    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.Configuration;
    
    /**
     * redisson配置
     */
    @Configuration
    public class RedissonManager {
        @Value("${spring.redis.clusters}")
        private  String cluster;
        @Value("${spring.redis.password}")
        private String password;
        
        @Bean
        public RedissonClient getRedisson(){
        	String[] nodes = cluster.split(",");
            //redisson版本是3.5，集群的ip前面要加上“redis://”，不然会报错，3.2版本可不加
        	for(int i=0;i<nodes.length;i++){
        	    nodes[i] = "redis://"+nodes[i];
        	}
        	RedissonClient redisson = null;
            Config config = new Config();
            config.useClusterServers() //这是用的集群server
            .setScanInterval(2000) //设置集群状态扫描时间 
            .addNodeAddress(nodes)
            .setPassword(password);
            redisson = Redisson.create(config);
    
            //可通过打印redisson.getConfig().toJSON().toString()来检测是否配置成功
            return redisson;
        }
        
    }

3.创建分布式锁的接口DistributedLocker

import java.util.concurrent.TimeUnit;
    import org.redisson.api.RLock;
    import org.redisson.api.RedissonClient;
    
    public interface DistributedLocker {
    
        RLock lock(String lockKey);
    
        RLock lock(String lockKey, long timeout);
    
        RLock lock(String lockKey, TimeUnit unit, long timeout);
    
        boolean tryLock(String lockKey, TimeUnit unit, long waitTime, long leaseTime);
    
        void unlock(String lockKey);
    
        void unlock(RLock lock);
    
    }

4.创建接口DistributedLocker的实现类

import org.redisson.api.RLock;
    import org.redisson.api.RedissonClient;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Component;
    import org.springframework.stereotype.Service;
    import java.util.concurrent.TimeUnit;
    
    @Component
    public class RedissonDistributedLocker implements DistributedLocker {
    	@Autowired
        private RedissonClient redissonClient;  //RedissonClient已经由配置类生成，这里自动装配即可
    
        //lock(), 拿不到lock就不罢休，不然线程就一直block
        @Override
        public RLock lock(String lockKey) {
            RLock lock = redissonClient.getLock(lockKey);
            lock.lock();
            return lock;
        }
    
        //leaseTime为加锁时间，单位为秒
        @Override
        public RLock lock(String lockKey, long leaseTime) {
            RLock lock = redissonClient.getLock(lockKey);
            lock.lock(leaseTime, TimeUnit.SECONDS);
            return lock;
        }
        
        //timeout为加锁时间，时间单位由unit确定
        @Override
        public RLock lock(String lockKey, TimeUnit unit ,long timeout) {
            RLock lock = redissonClient.getLock(lockKey);
            lock.lock(timeout, unit);
            return lock;
        }
        //tryLock()，马上返回，拿到lock就返回true，不然返回false。
        //带时间限制的tryLock()，拿不到lock，就等一段时间，超时返回false.
        @Override
        public boolean tryLock(String lockKey, TimeUnit unit, long waitTime, long 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();
        }
    }

5.使用分布式锁

@RestController
    @RequestMapping("/redisson")
    public class AdvMaterialController {
    	@Autowired
    	private DistributedLocker distributedLocker;
    	
    	@RequestMapping("/test")
    	public void redissonTest() {
    		String key = "redisson_key";
    		for (int i = 0; i < 100; i++) {
    		Thread t = new Thread(new Runnable() {
    			@Override
    			public void run() {
    				try {
    					System.err.println("=============线程开启============"+Thread.currentThread().getName());
    					/*distributedLocker.lock(key,10L); //直接加锁，获取不到锁则一直等待获取锁
    					 Thread.sleep(100); //获得锁之后可以进行相应的处理
    					 System.err.println("======获得锁后进行相应的操作======"+Thread.currentThread().getName());
    					 distributedLocker.unlock(key);  //解锁
    					 System.err.println("============================="+Thread.currentThread().getName());*/
    					boolean isGetLock =  distributedLocker.tryLock(key,TimeUnit.SECONDS,5L,10L); //尝试获取锁，等待5秒，自己获得锁后一直不解锁则10秒后自动解锁
    					if(isGetLock){
    						 Thread.sleep(100); //获得锁之后可以进行相应的处理
    						 System.err.println("======获得锁后进行相应的操作======"+Thread.currentThread().getName());
    						 //distributedLocker.unlock(key);
    						 System.err.println("============================="+Thread.currentThread().getName());
    					}
    				} catch (Exception e) {
    					e.printStackTrace();
    				}
    			}
    		});
    		t.start();
    	}
    	}
    }