介绍redis分布式锁

推荐(免费)：redis

Redisson

redisson和下列一下自行封装两种方式的区别（场景）：

1. redisson未获取到锁的会进入等待，直到获取到锁。
2. 另外两种方式如果未获取到锁，会放弃，不会执行业务代码。

    org.redisson
    redisson-spring-boot-starter
    3.13.6

@Autowiredprivate Redisson redisson;@GetMapping("/redissonLock")public String redissonLock() {
    log.info("进入了方法");
    RLock lock = redisson.getLock("redissonLock");
    try {
        lock.lock(30, TimeUnit.SECONDS);
        Thread.sleep(10000);
        System.out.println("我是你大哥");
    } catch (InterruptedException e) {
        e.printStackTrace();
    } finally {
    // 如果不释放，不会唤起其他线程，则其他线程会超时过期自动唤醒，不会执行业务代码
        lock.unlock();
    }
    return "运行结束";}

RedisTemplate封装redis锁（1）

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   org.springframework.boot
   spring-boot-starter-data-redis

package com.util;import org.springframework.dao.DataAccessException;import org.springframework.data.redis.connection.RedisConnection;import org.springframework.data.redis.connection.RedisStringCommands;import org.springframework.data.redis.core.RedisCallback;import org.springframework.data.redis.core.RedisTemplate;import org.springframework.data.redis.core.script.RedisScript;import org.springframework.data.redis.core.types.Expiration;import org.springframework.stereotype.Component;import java.util.Arrays;@Componentpublic class RedisLock {

    private static RedisTemplate redisTemplate;

    private static String script = "if redis.call(\"get\",KEYS[1]) == ARGV[1] then\n" +
            "\treturn redis.call(\"del\",KEYS[1])\n" +
            "else\n" +
            "   \treturn 0\t\n" +
            "end  ";

    public RedisLock(RedisTemplate redisTemplate) {
        RedisLock.redisTemplate = redisTemplate;
    }

    public static Boolean getLock(String key, String value, Long expireTime) {
        RedisStringCommands.SetOption setOption = RedisStringCommands.SetOption.ifAbsent();
        Expiration expiration = Expiration.seconds(expireTime);
        RedisCallback booleanRedisCallback = new RedisCallback() {
            @Override
            public Boolean doInRedis(RedisConnection connection) throws DataAccessException {
                return connection.set(redisTemplate.getKeySerializer().serialize(key), redisTemplate.getValueSerializer().serialize(value), expiration, setOption);
            }
        };
        return (Boolean) redisTemplate.execute(booleanRedisCallback);
    }

    public static Boolean unLock(String key, String value) {
        RedisScript redisScript = RedisScript.of(script, Boolean.class);
        return (Boolean) redisTemplate.execute(redisScript, Arrays.asList(key), value);
    }}

@GetMapping("/redisLock")public String redisLock() {
    log.info("进入了方法");
    String key = "redisLock";
    String uuid = UUID.randomUUID().toString();
    try {
        if (RedisLock.getLock(key, uuid, 30L)) {
            log.info("进入了锁");
            Thread.sleep(10000);
        }
    } catch (InterruptedException e) {
        e.printStackTrace();
    } finally {
        RedisLock.unLock(key, uuid);
    }
    log.info("方法执行完成");
    return "程序结束";}

RedisTemplate封装redis锁（2）

package com.util;import lombok.extern.slf4j.Slf4j;import org.springframework.dao.DataAccessException;import org.springframework.data.redis.connection.RedisConnection;import org.springframework.data.redis.connection.RedisStringCommands;import org.springframework.data.redis.core.RedisCallback;import org.springframework.data.redis.core.RedisTemplate;import org.springframework.data.redis.core.script.RedisScript;import org.springframework.data.redis.core.types.Expiration;import java.util.Arrays;import java.util.UUID;@Slf4jpublic class HighRedisLock implements AutoCloseable{

    private RedisTemplate redisTemplate;

    private String key;

    private String value;

    private Long expireTime;

    private static String script = "if redis.call(\"get\",KEYS[1]) == ARGV[1] then\n" +
            "\treturn redis.call(\"del\",KEYS[1])\n" +
            "else\n" +
            "   \treturn 0\t\n" +
            "end  ";

    public HighRedisLock(RedisTemplate redisTemplate, String key, Long expireTime) {
        this.redisTemplate = redisTemplate;
        this.key = key;
        this.value = UUID.randomUUID().toString();
        this.expireTime = expireTime;
    }

    public Boolean getLock() {
        RedisStringCommands.SetOption setOption = RedisStringCommands.SetOption.ifAbsent();
        Expiration expiration = Expiration.seconds(expireTime);
        RedisCallback booleanRedisCallback = new RedisCallback() {
            @Override
            public Boolean doInRedis(RedisConnection connection) throws DataAccessException {
                return connection.set(redisTemplate.getKeySerializer().serialize(key), redisTemplate.getValueSerializer().serialize(value), expiration, setOption);
            }
        };
        return (Boolean) redisTemplate.execute(booleanRedisCallback);
    }

    public Boolean unLock() {
        RedisScript redisScript = RedisScript.of(script, Boolean.class);
        return (Boolean) redisTemplate.execute(redisScript, Arrays.asList(key), value);
    }

    @Override
    public void close() throws Exception {
        unLock();
    }}

@Autowiredprivate RedisTemplate redisTemplate;@GetMapping("/highRedisLock")public String highRedisLock() {
    log.info("进入了方法");
    try (HighRedisLock redisLock = new HighRedisLock(redisTemplate, "highRedisLock", 30L)) {
        if (redisLock.getLock()) {
            log.info("进入了锁");
            Thread.sleep(10000);
        }
    } catch (InterruptedException e) {
        e.printStackTrace();
    } catch (Exception e) {
        e.printStackTrace();
    }
    log.info("方法执行完成");
    return "程序结束";}