Redis --- 02 Redis Java client

1. Attention

　　To connect to Redis installed in Linux, you need to perform the following steps:

　　① Disable firewall (CentOS 7): systemctl stop firewalld.service

　　② Comment out bind 127.0.0.1 in redis.conf and then protect-mode no

Second, the use of Java

　　1. Import Jedis-2.1.0.jar

　　2. Write code:

package com.jenne.redis; 

import org.junit.Before; 
import org.junit.Test; 
import redis.clients.jedis.Jedis; 

import java.util. *; 

public class RedisDemo01 { 
    Jedis jedis; 

    @Before 
    public void init ( ) { 
        // Connect to local Redis service 
        jedis = new Jedis ("192.168.7.128", 6379); 
    } 

    @Test 
    public void testPing () { 
        init (); 
        // Check if the service is running, type pong to indicate OK 
        System.out .println ("connection is OK ==========>:" + jedis.ping ()); 
    } 

    @Test 
    public void testKey () { 
        Set <String> keys = jedis.keys ("*" );
        for (Iterator iterator = keys.iterator(); iterator.hasNext(); ) {
            String key = (String) iterator.next();
            System.out.println(key);
        }
        System.out.println("jedis.exists====>" + jedis.exists("k2"));
        System.out.println(jedis.ttl("k1"));

    }

    @Test
    public void testString() {
        System.out.println(jedis.get("k1"));
        jedis.set("k4", "k4_Redis");
        System.out.println("----------------------------------------");
        jedis.mset("str1", "v1", "str2", "v2", "str3", "v3");
        System.out.println(jedis.mget("str1", "str2", "str3"));
    }

    @Test
    public void testList() {
        List<String> list = jedis.lrange("mylist", 0, -1);
        for (String element : list) {
            System.out.println(element);
        }
    }

    @Test
    public void testSet() {
        jedis.sadd("orders", "jd001");
        jedis.sadd("orders", "jd002");
        jedis.sadd("orders", "jd003");
        Set<String> set1 = jedis.smembers("orders");
        for (Iterator iterator = set1.iterator(); iterator.hasNext(); ) {
            String string = (String) iterator.next();
            System.out.println(string);
        }
        jedis.srem("orders", "jd002");
    }

    @Test
    public void testHash() {
        jedis.hset("hash1", "userName", "lisi");
        System.out.println(jedis.hget("hash1", "userName"));
        Map<String, String> map = new HashMap<String, String>();
        map.put("telphone", "13810169999");
        map.put("address", "atguigu");
        map.put("email", "[email protected]");
        jedis.hmset("hash2", map);
        List<String> result = jedis.hmget("hash2", "telphone", "email");
        for (String element : result) {
            System.out.println(element);
        }
    }

    @Test
    public void testZset() {
        jedis.zadd("zset01", 60d, "v1");
        jedis.zadd("zset01", 70d, "v2");
        jedis.zadd("zset01", 80d, "v3");
        jedis.zadd("zset01", 90d, "v4");
        Set<String> s1 = jedis.zrange("zset01", 0, -1);
        for (Iterator iterator = s1.iterator(); iterator.hasNext(); ) {
            String string = (String) iterator.next();
            System.out.println(string);
        }
    }
}

 3. Use of Redis connection pool

　　1. Import commons-pool2-2.4.2.jar

　　2. Write code:

package com.jenne.redis;

import org.junit.Before;
import org.junit.Test;
import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisPool;
import redis.clients.jedis.JedisPoolConfig;

public class RedisDemo02 {
    JedisPool jedisPool;
    Jedis jedis;

    @Before
    public void init() {
        //设置到JedisPoolConfig中
        JedisPoolConfig config = new JedisPoolConfig();
        config.setMaxTotal(50);
        config.setMaxIdle(10);

        //初始化JedisPool
        jedisPool = new JedisPool(config, "192.168.7.128", 6379);
        jedis = jedisPool.getResource();
    }

    @Test
    public void testPool() {
        String ping = jedis.ping();
        System.out.println(ping);
    }
}