Redis，JedisPool工具类

Redis，JedisPool工具类

• 1、JedisPool
• 详细配置解释代码
• 2、Jedis工具类

导入相关依赖：

commons-pool2-2.3.jar
jedis-2.7.0.jar

1、JedisPool

package com.yj.test.javaBases.testJedis;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisCommands;
import redis.clients.jedis.JedisPool;
import redis.clients.jedis.JedisPoolConfig;

public class TestJedis {
    public static final Logger logger = LoggerFactory.getLogger(TestJedis.class);
    // Jedispool
    JedisCommands jedisCommands;
    JedisPool jedisPool;
    JedisPoolConfig jedisPoolConfig = new JedisPoolConfig();
    String ip = "192.168.x.x";
    int port = 6379;
    int timeout = 2000;

    public TestJedis() {
        // 初始化jedis
        // 设置配置
        jedisPoolConfig.setMaxTotal(1024);
        jedisPoolConfig.setMaxIdle(100);
        jedisPoolConfig.setMaxWaitMillis(100);
        jedisPoolConfig.setTestOnBorrow(false);//jedis 第一次启动时，会报错
        jedisPoolConfig.setTestOnReturn(true);
        // 初始化JedisPool
        jedisPool = new JedisPool(jedisPoolConfig, ip, port, timeout);
        //  
        Jedis jedis = jedisPool.getResource();

        jedisCommands = jedis;
    }

    public void setValue(String key, String value) {
        this.jedisCommands.set(key, value);
    }

    public String getValue(String key) {
        return this.jedisCommands.get(key);
    }

    public static void main(String[] args) {
        TestJedis testJedis = new TestJedis();
        testJedis.setValue("testJedisKey", "testJedisValue");
        logger.info("get value from redis:{}",testJedis.getValue("testJedisKey"));
    }

}

详细配置解释代码

package com.test;

import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisPool;
import redis.clients.jedis.JedisPoolConfig;

public  class RedisUtil {
    //Redis服务器IP
    private static String ADDR = "192.168.0.41";
    //Redis的端口号
    private static int PORT = 6379;
    //访问密码
    private static String AUTH = "admin";
    //可用连接实例的最大数目，默认值为8；
    //如果赋值为-1，则表示不限制；如果pool已经分配了maxActive个jedis实例，则此时pool的状态为exhausted(耗尽)。
    private static int MAX_TOTAL = 8;
    //最小空闲连接数, 默认0
    private static int MIN_IDLE=0;
    //控制一个pool最多有多少个状态为idle(空闲的)的jedis实例，默认值也是8。
    //最大空闲连接数, 默认8个
    private static int MAX_IDLE = 8;
    //获取连接时的最大等待毫秒数(如果设置为阻塞时BlockWhenExhausted),如果超时就抛异常, 小于零:阻塞不确定的时间,  默认-1
    //等待可用连接的最大时间，单位毫秒，默认值为-1，表示永不超时。如果超过等待时间，则直接抛出JedisConnectionException；
    private static int MAX_WAIT = -1;
    private static int TIMEOUT = 10000;
    //连接耗尽时是否阻塞, false报异常,ture阻塞直到超时, 默认true
    private static boolean BLOCK_WHEN_EXHAUSTED = false; 
    //设置的逐出策略类名, 默认DefaultEvictionPolicy(当连接超过最大空闲时间,或连接数超过最大空闲连接数)
    private static String EVICTION_POLICY_CLASSNAME="org.apache.commons.pool2.impl.DefaultEvictionPolicy";
    //是否启用pool的jmx管理功能, 默认true
    private static boolean JMX_ENABLED=true;
    //MBean ObjectName = new ObjectName("org.apache.commons.pool2:type=GenericObjectPool,name=" + "pool" + i); 默认为"pool", JMX不熟,具体不知道是干啥的...默认就好.
    private static String JMX_NAME_PREFIX="pool";
    //是否启用后进先出, 默认true
    private static boolean LIFO=true;
    //逐出连接的最小空闲时间 默认1800000毫秒(30分钟)
    private static long MIN_EVICTABLE_IDLE_TIME_MILLIS=1800000L;
    //对象空闲多久后逐出, 当空闲时间>该值 且 空闲连接>最大空闲数 时直接逐出,不再根据MinEvictableIdleTimeMillis判断  (默认逐出策略)   
    private static long SOFT_MIN_EVICTABLE_IDLE_TIME_MILLIS=1800000L;
    //每次逐出检查时 逐出的最大数目 如果为负数就是 : 1/abs(n), 默认3
    private static int NUM_TESTS_PER_EVICYION_RUN=3;
    //在borrow一个jedis实例时，是否提前进行validate操作；如果为true，则得到的jedis实例均是可用的；
    //在获取连接的时候检查有效性, 默认false
    private static boolean TEST_ON_BORROW = false;
    //在空闲时检查有效性, 默认false
    private static boolean TEST_WHILEIDLE=false;
    //逐出扫描的时间间隔(毫秒) 如果为负数,则不运行逐出线程, 默认-1
    private static long TIME_BERWEEN_EVICTION_RUNS_MILLIS=-1;
    
    private static JedisPool jedisPool = null;
    
    /**
     * 初始化Redis连接池
     */
    static {
        try {
            JedisPoolConfig config = new JedisPoolConfig();
            config.setBlockWhenExhausted(BLOCK_WHEN_EXHAUSTED);
            config.setEvictionPolicyClassName(EVICTION_POLICY_CLASSNAME); 
            config.setJmxEnabled(JMX_ENABLED);
            config.setJmxNamePrefix(JMX_NAME_PREFIX);
            config.setLifo(LIFO);
            config.setMaxIdle(MAX_IDLE);
            config.setMaxTotal(MAX_TOTAL);
            config.setMaxWaitMillis(MAX_WAIT);
            config.setMinEvictableIdleTimeMillis(MIN_EVICTABLE_IDLE_TIME_MILLIS);
            config.setMinIdle(MIN_IDLE);
            config.setNumTestsPerEvictionRun(NUM_TESTS_PER_EVICYION_RUN);
            config.setSoftMinEvictableIdleTimeMillis(SOFT_MIN_EVICTABLE_IDLE_TIME_MILLIS);
            config.setTestOnBorrow(TEST_ON_BORROW);
            config.setTestWhileIdle(TEST_WHILEIDLE);
            config.setTimeBetweenEvictionRunsMillis(TIME_BERWEEN_EVICTION_RUNS_MILLIS);
            
            jedisPool = new JedisPool(config, ADDR, PORT, TIMEOUT, AUTH);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    
    /**
     * 获取Jedis实例
     * @return
     */
    public synchronized static Jedis getJedis() {
        try {
            if (jedisPool != null) {
                Jedis resource = jedisPool.getResource();
                return resource;
            } else {
                return null;
            }
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

    /**
     * 释放jedis资源
     * @param jedis
     */
    public static void close(final Jedis jedis) {
        if (jedis != null) {
            jedis.close();
        }
    }
}

2、Jedis工具类

import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisPool;
import redis.clients.jedis.JedisPoolConfig;

public class RedisUtil {
    //服务器IP地址
    private static String ADDR = "ip";
    //端口
    private static int PORT = 6379;
    //密码
    private static String AUTH = "";
    //连接实例的最大连接数
    private static int MAX_ACTIVE = 1024;
    //控制一个pool最多有多少个状态为idle(空闲的)的jedis实例，默认值也是8。
    private static int MAX_IDLE = 200;
    //等待可用连接的最大时间，单位毫秒，默认值为-1，表示永不超时。如果超过等待时间，则直接抛出JedisConnectionException
    private static int MAX_WAIT = 10000;
    //连接超时的时间　　
    private static int TIMEOUT = 10000;
    // 在borrow一个jedis实例时，是否提前进行validate操作；如果为true，则得到的jedis实例均是可用的；
    private static boolean TEST_ON_BORROW = true;

    private static JedisPool jedisPool = null;
    //数据库模式是16个数据库 0~15 
    public static final int DEFAULT_DATABASE = 0;

    /**
     * 初始化Redis连接池
     */
    static {
        try {
            JedisPoolConfig config = new JedisPoolConfig();
            config.setMaxTotal(MAX_ACTIVE);
            config.setMaxIdle(MAX_IDLE);
            config.setMaxWaitMillis(MAX_WAIT);
            config.setTestOnBorrow(TEST_ON_BORROW);
            jedisPool = new JedisPool(config, ADDR, PORT, TIMEOUT, null, DEFAULT_DATABASE);
        } catch (Exception e) {
            e.printStackTrace();
        }

    }

    /**
     * 获取Jedis实例
     */
    public synchronized static Jedis getJedis() {
        try {

            if (jedisPool != null) {
                Jedis resource = jedisPool.getResource();
                System.out.println("redis--服务正在运行: " + resource.ping());
                return resource;
            } else {
                return null;
            }
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

    public synchronized Jedis getJedisPublic() {
        try {
            if (jedisPool != null) {
                Jedis resource = jedisPool.getResource();
                System.out.println("redis--服务正在运行: " + resource.ping());
                return resource;
            } else {
                return null;
            }
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

    /***
     *
     * 释放资源
     */
    public static void returnResource(final Jedis jedis) {
        if (jedis != null) {
            jedisPool.returnResource(jedis);
        }
    }


    public static void main(String[] args) {
        Jedis jedis = RedisUtil.getJedis();
        jedis.lpush("site-list", "Runoob");
        jedis.lpush("site-list", "Google");
        jedis.lpush("site-list", "Taobao");

        jedis.hset("OverDrive", "vehicle", "1");
        jedis.hset("OverDrive", "car", "1");

        jedis.expire("OverDrive", 60);

        jedis.set("runoobkey", "www.runoob.com");
        // 获取存储的数据并输出
        System.out.println("redis 存储的字符串为: " + jedis.get("runoobkey"));

        RedisUtil.returnResource(jedis);
    }
}