Jedis

柔光的暖阳◎ 2022-03-01 13:14 261阅读 0赞

## 一、键操作： ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0ppblhZYW4_size_16_color_FFFFFF_t_70][]

## 二、字符串操作： ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0ppblhZYW4_size_16_color_FFFFFF_t_70 1][]

## 三、整数和浮点数操作： ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0ppblhZYW4_size_16_color_FFFFFF_t_70 2][]

## 四、列表（List）操作： ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0ppblhZYW4_size_16_color_FFFFFF_t_70 3][]

## 五、集合（Set）操作： ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0ppblhZYW4_size_16_color_FFFFFF_t_70 4][]

##  六、哈希（Hash）操作： ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0ppblhZYW4_size_16_color_FFFFFF_t_70 5][]

## 七、有序集合（Zsort）操作： ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0ppblhZYW4_size_16_color_FFFFFF_t_70 6][]

##  八、排序操作： ##

![20190322170521812.png][]

Java 连接 MySql 我们有 mysql-connector ，连接 Redis 我们有 jedis。

## 九、实例 ##

### 引入依赖 ###

*  <dependency>
 *      <groupId>redis.clients</groupId>
 *      <artifactId>jedis</artifactId>
 *      <version>2.9.0</version>
 *  </dependency>

对应的是这两个 jar 包：

![20190322165729693.png][]

###  使用 Jedis 提供的 API ###

package com.qjl.pems.test;
    import java.util.Set;
    import org.junit.Test;
    import redis.clients.jedis.Jedis;
    import redis.clients.jedis.Transaction;
    
    /**
     * 类描述：测试Redis的客户端Jedis
     */
    public class JedisTest {
    
        /**
         * 测试与redis的连通性
         */
        @Test
        public void testPing() {
            Jedis jedis = new Jedis("192.168.198.130", 6379);
            System.out.println(jedis.ping());
            jedis.close();
        }
    
        /**
         * 测试redis常用api
         */
        @Test
        public void testRedisAPI() {
            Jedis jedis = new Jedis("192.168.198.130", 6379);
    //      String info = jedis.info("replication");
    //      System.out.println(info);
            jedis.set("k1", "v1");
            jedis.set("k2", "v2");
            jedis.set("k3", "v3");
            System.out.println(jedis.get("k2"));
    
            Set<String> sets = jedis.keys("*");
            System.out.println(sets.size());
            jedis.close();
        }
    
        /**
         * 演示主从复制
         */
        @Test
        public void testMasterSlave() {
            Jedis jedisM = new Jedis("192.168.198.130", 6379);
            Jedis jedisS = new Jedis("192.168.198.130", 6380);
    
            jedisS.slaveof("192.168.198.130", 6379);
            jedisM.set("name", "qujianlei");
            String result = jedisS.get("name");
            System.out.println(result);
            jedisM.close();
            jedisS.close();
        }
    
        /**
         * 演示事务
         */
        @Test
        public void testTransaction() {
            Jedis jedis = new Jedis("192.168.198.130", 6379);
            jedis.set("balanceA", "100"); // A账户可用余额
            jedis.set("balanceB", "220"); // B账户可用余额
    
            // 互斥锁(锁key)
            jedis.watch("balanceA");
    
            System.out.println("=====开始转账 A-->B 50 =====");
    
            Transaction tx = jedis.multi();
    
            tx.decrBy("balanceA", 50);
            tx.incrBy("balanceB", 50);
    
            tx.exec();
    
            System.out.println("=====转账结束=====");
            // 解锁全部被watch的key
            jedis.unwatch();
    
            System.out.println("======开始取款=====");
            System.out.println("A账户可用余额：" + jedis.get("balanceA"));
            System.out.println("B账户可用余额：" + jedis.get("balanceB"));
    
            jedis.close();
        }
    }

### **jedis 作为一个数据库同样也有数据库连接池 JedisPool，封装了一个简单的获取 Jedis 连接池的工具类（单例模式）：** ###

package com.qjl.pems.test;
    
    import redis.clients.jedis.JedisPool;
    import redis.clients.jedis.JedisPoolConfig;
    
    public class JedisPoolUtil {
    
        private volatile static JedisPool JEDIS_POOL = null;
    
        private JedisPoolUtil() {}
    
        public static JedisPool getJedisPool() {
            if (JEDIS_POOL == null) {
                synchronized(JedisPoolUtil.class) {
                    if (JEDIS_POOL == null) {
                        JedisPoolConfig poolConfig = new JedisPoolConfig();
                        poolConfig.setMaxTotal(500); // 500个连接
                        poolConfig.setMaxIdle(32); // 最大的空闲连接
                        poolConfig.setMaxWaitMillis(100 * 1000); // 最长的等待时间
                        poolConfig.setTestOnBorrow(true); // 获得一个jedis连接时检测可用性
    
                        JEDIS_POOL = new JedisPool(poolConfig, "192.168.198.130", 6379);
                    }
                }
            }
            return JEDIS_POOL;
        }   
    }

测试类如下：

package com.qjl.pems.test;
    
    import java.util.Set;
    import org.junit.Test;
    import redis.clients.jedis.Jedis;
    import redis.clients.jedis.JedisPool;
    import redis.clients.jedis.Transaction;
    
    /**
     * 类描述：测试Redis的客户端Jedis
     */
    public class JedisTest {
    
        /**
         * 测试jedis连接池
         */
        @Test
        public void testJedisPool() {
            // 1.获取连接池
            JedisPool jedisPool = JedisPoolUtil.getJedisPool();
            // 2.获取某个连接
            Jedis jedis = jedisPool.getResource();
            // 3.设置键值
            jedis.slaveofNoOne(); // 成为 master
            jedis.set("a", "b");
            // 4.获取键对应的值
            System.out.println(jedis.get("a"));
        }
    
    }

转载：[https://blog.csdn.net/zhangguanghui002/article/details/78770071][https_blog.csdn.net_zhangguanghui002_article_details_78770071]

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[20190322170521812.png]: /images/20220301/fd51ae8dd9aa410b92f59e2f47b95599.png
[20190322165729693.png]: /images/20220301/f299ddd052804aef9decca079a9b13cc.png
[https_blog.csdn.net_zhangguanghui002_article_details_78770071]: https://blog.csdn.net/zhangguanghui002/article/details/78770071