redis(jedis)工具类实例：集群模式和单机模式

redis(jedis)工具类实例：集群模式和单机模式

    在写redis工具类之前，我们首先需要知道如何读取redis配置文件，此处提供properties配置文件的读取工具类，大家可以直接使用：https://blog.csdn.net/weixin_42315600/article/details/87170735

1、集群模式工具类

package com.wonddream.utils;

import java.util.HashSet;
import java.util.Set;
import redis.clients.jedis.HostAndPort;
import redis.clients.jedis.JedisCluster;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

public class JedisClusterUtil {
    private static final Log logger = LogFactory.getLog(JedisClusterUtil.class);

    private static Set<HostAndPort> jedisClusterNodes = new HashSet<HostAndPort>();
    private static JedisCluster jedisCluster = null;
        
    /**
     * 初始化jedisCluster对象
     */
    static {
        try {
            jedisCluster = reloadJedisCluster();
        } catch (Exception e) {
            logger.error(e.getMessage(), e);
        }
    }

    /**
     * 集群模式
     * 获取JedisCluster对象
     * @return
     * @throws Exception
     */
    public static JedisCluster getJedisCluster() throws Exception {
        if (jedisCluster == null) {
            synchronized (JedisClusterUtil.class) {
                jedisCluster = reloadJedisCluster();
            }
        }
        return jedisCluster;
    }
    
    /**
     * 集群模式
     * 获取JedisCluster方法
     * @return
     * @throws Exception
     */
    public static JedisCluster reloadJedisCluster() throws Exception {
        logger.info("初始化实体");
        JedisCluster cluster;
        String redisAddrCfg =     
        PropertiesUtil.getString("redis.address","config/redisConfig");
        logger.info("******redis集群配置："+redisAddrCfg);
        if (StringUtil.isEmpty(redisAddrCfg) || redisAddrCfg.split(",").length == 0) {
            throw new Exception("System.properties中REDIS_ADDR_CFG属性为空");
        }
        String[] addrs = redisAddrCfg.split(",");
        for (String addr : addrs) {
            String[] ipAndPort = addr.split(":");
            if (ipAndPort == null || ipAndPort.length != 2) {
                throw new Exception("System.properties中REDIS_ADDR_CFG属性配置错误");
            }
            jedisClusterNodes.add(new HostAndPort(ipAndPort[0], 
                  Integer.parseInt(ipAndPort[1])));
        }
        cluster = new JedisCluster(jedisClusterNodes, 2000, 6);
        return cluster;
    }

    /*
     * 测试
     */
	public static void main(String[] args) throws Exception {
				
	}
}

2、单机模式工具类

package com.wonddream.utils;

import redis.clients.jedis.Jedis;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

public class JedisUtil {
    private static final Log logger = LogFactory.getLog(JedisUtil.class);
    private static Jedis jedis = null;
    
    /**
     * 初始化jedis对象
     */
    static {
    	 try {
             jedis = reloadJedis();
         } catch (Exception e) {
             logger.error(e.getMessage(), e);
         }
    }
        
    /**
     * 单机模式
     * 获取Jedis对象
     * @return
     * @throws Exception
     */
    public static Jedis getJedis() throws Exception {
        if (jedis == null) {
            synchronized (JedisUtil.class) {
                jedis = reloadJedis();
            }
        }
        return jedis;
    }
    
    /**
     * 单机模式
     * 获取Jedis方法
     * @return
     * @throws Exception
     */
    public static Jedis reloadJedis() throws Exception {
        logger.info("初始化实体");
        Jedis jedis;
        String redisAddrCfg = PropertiesUtil.getString("redis.address","config/redisConfig");
        logger.info("******redis单机配置："+redisAddrCfg);
        if (StringUtil.isEmpty(redisAddrCfg) || redisAddrCfg.split(",").length == 0) {
            throw new Exception("System.properties中REDIS_ADDR_CFG属性为空");
        } 
        String[] ipAndPort = redisAddrCfg.split(":");
        if (ipAndPort == null || (ipAndPort.length != 2 && ipAndPort.length != 3)) {
            throw new Exception("System.properties中REDIS_ADDR_CFG属性配置错误");
        }
        jedis = new Jedis(ipAndPort[0], Integer.parseInt(ipAndPort[1]), 2000, 30);
        //如果使用这redis设置有密码，则需要再次设置授权。我的redis配置格式：ip：port:password
        //使用者可以根据自己的情况自行调整
        if(ipAndPort.length == 3) {
        	jedis.auth(ipAndPort[2]);	
        }        
        return jedis;
    }
    
    /*
     * 测试
     */
	public static void main(String[] args) throws Exception {
		getJedis().setex("name", 2, "wangpenghui");
		System.out.println(getJedis().get("name"));
		Thread.sleep(3000);
		System.out.println(getJedis().get("name"));		
	}
}