吊炸天Redisson 实现分布式锁

package io.renren.utils;

import org.redisson.Redisson;
import org.redisson.api.RedissonClient;
import org.redisson.config.Config;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
 
/**
 * redisson配置
 */
@Configuration
public class RedissonManager {

    
    @Bean
    public RedissonClient getRedisson(){
        //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
    	RedissonClient redisson = null;
        Config config = new Config();
        config.useSingleServer().setAddress("redis://127.0.0.1:6379");
        redisson = Redisson.create(config);

 
        //可通过打印redisson.getConfig().toJSON().toString()来检测是否配置成功
        return redisson;
    }
    
}

package io.renren.utils;

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);
 
}

package io.renren.utils;

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();
    }
}

package io.renren.api.controller;

import io.renren.utils.DistributedLocker;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.concurrent.TimeUnit;

@RestController
@RequestMapping("/redisson")
public class AdvMaterialController {
	@Autowired
	private DistributedLocker distributedLocker;

	private int flag = 10;
	
	@RequestMapping("/test")
	public void redissonTest() {
		String key = "redisson_key";
		for (int i = 0; i < 30; 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){
						if(flag!=0){
							flag= flag - 1;
						}
						 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());
					}else{
						System.out.println("结束"+flag);

					}
				} catch (Exception e) {
					e.printStackTrace();
				}
			}
		});
		t.start();
		}
		System.out.println(flag);
	}
}