jedis使用api（2）

以你之姓@ 2022-09-25 12:24 183阅读 0赞

/** 
     * 获取连接池. 
     * @return 连接池实例 
     */  
    private static JedisPool getPool(String ip,int port) {  
        JedisPoolConfig config = new JedisPoolConfig();  
        config.setMaxActive(RedisConfig.getMaxactive());  
        config.setMaxIdle(RedisConfig.getMaxidle());  
        config.setMaxWait(RedisConfig.getMaxwait());  
        config.setTestOnBorrow(true);  
        config.setTestOnReturn(true);  
        try{    
            /** 
             *如果你遇到 java.net.SocketTimeoutException: Read timed out exception的异常信息 
             *请尝试在构造JedisPool的时候设置自己的超时值. JedisPool默认的超时时间是2秒(单位毫秒) 
             */  
            pool = new JedisPool(config, ip, port,RedisConfig.getTimeout());  
        } catch(Exception e) {  
            e.printStackTrace();  
        }  
        return pool;  
    }

package com.zhongsou.vertportal.util;  
      
    import java.util.HashMap;  
    import java.util.Map;  
      
    import org.slf4j.Logger;  
    import org.slf4j.LoggerFactory;  
      
    import redis.clients.jedis.Jedis;  
    import redis.clients.jedis.JedisPool;  
    import redis.clients.jedis.JedisPoolConfig;  
      
    import com.zhongsou.vertportal.conf.BaseConfig;  
    import com.zhongsou.vertportal.conf.RedisConfig;  
      
    /** 
     * Redis工具类,用于获取RedisPool. 
     * 参考官网说明如下： 
     * You shouldn't use the same instance from different threads because you'll have strange errors. 
     * And sometimes creating lots of Jedis instances is not good enough because it means lots of sockets and connections, 
     * which leads to strange errors as well. A single Jedis instance is not threadsafe! 
     * To avoid these problems, you should use JedisPool, which is a threadsafe pool of network connections. 
     * This way you can overcome those strange errors and achieve great performance. 
     * To use it, init a pool: 
     *  JedisPool pool = new JedisPool(new JedisPoolConfig(), "localhost"); 
     *  You can store the pool somewhere statically, it is thread-safe. 
     *  JedisPoolConfig includes a number of helpful Redis-specific connection pooling defaults. 
     *  For example, Jedis with JedisPoolConfig will close a connection after 300 seconds if it has not been returned. 
     * @author wujintao 
     */  
    public class JedisUtil  {  
        protected Logger log = LoggerFactory.getLogger(getClass());  
          
        /** 
         * 私有构造器. 
         */  
        private JedisUtil() {  
              
        }  
        private static Map<String,JedisPool> maps  = new HashMap<String,JedisPool>();  
          
          
        /** 
         * 获取连接池. 
         * @return 连接池实例 
         */  
        private static JedisPool getPool(String ip,int port) {  
            String key = ip+":" +port;  
            JedisPool pool = null;  
            if(!maps.containsKey(key)) {  
                JedisPoolConfig config = new JedisPoolConfig();  
                config.setMaxActive(RedisConfig.getMaxactive());  
                config.setMaxIdle(RedisConfig.getMaxidle());  
                config.setMaxWait(RedisConfig.getMaxwait());  
                config.setTestOnBorrow(true);  
                config.setTestOnReturn(true);  
                try{    
                    /** 
                     *如果你遇到 java.net.SocketTimeoutException: Read timed out exception的异常信息 
                     *请尝试在构造JedisPool的时候设置自己的超时值. JedisPool默认的超时时间是2秒(单位毫秒) 
                     */  
                    pool = new JedisPool(config, ip, port,RedisConfig.getTimeout());  
                    maps.put(key, pool);  
                } catch(Exception e) {  
                    e.printStackTrace();  
                }  
            }else{  
                pool = maps.get(key);  
            }  
            return pool;  
        }  
      
        /** 
         *类级的内部类，也就是静态的成员式内部类，该内部类的实例与外部类的实例 
         *没有绑定关系，而且只有被调用到时才会装载，从而实现了延迟加载。 
         */  
        private static class RedisUtilHolder{  
            /** 
             * 静态初始化器，由JVM来保证线程安全 
             */  
            private static JedisUtil instance = new JedisUtil();  
        }  
      
        /** 
         *当getInstance方法第一次被调用的时候，它第一次读取 
         *RedisUtilHolder.instance，导致RedisUtilHolder类得到初始化；而这个类在装载并被初始化的时候，会初始化它的静 
         *态域，从而创建RedisUtil的实例，由于是静态的域，因此只会在虚拟机装载类的时候初始化一次，并由虚拟机来保证它的线程安全性。 
         *这个模式的优势在于，getInstance方法并没有被同步，并且只是执行一个域的访问，因此延迟初始化并没有增加任何访问成本。 
         */  
        public static JedisUtil getInstance() {  
            return RedisUtilHolder.instance;  
        }  
          
        /** 
         * 获取Redis实例. 
         * @return Redis工具类实例 
         */  
        public Jedis getJedis(String ip,int port) {  
            Jedis jedis  = null;  
            int count =0;  
            do{  
                try{   
                    jedis = getPool(ip,port).getResource();  
                    //log.info("get redis master1!");  
                } catch (Exception e) {  
                    log.error("get redis master1 failed!", e);  
                     // 销毁对象    
                    getPool(ip,port).returnBrokenResource(jedis);    
                }  
                count++;  
            }while(jedis==null&&count<BaseConfig.getRetryNum());  
            return jedis;  
        }  
      
        /** 
         * 释放redis实例到连接池. 
         * @param jedis redis实例 
         */  
        public void closeJedis(Jedis jedis,String ip,int port) {  
            if(jedis != null) {  
                getPool(ip,port).returnResource(jedis);  
            }  
        }  
    }

开发参考资料：

redis官方文档：http://redis.io/documentation

redis命令参考中文版：http://redis.readthedocs.org/en/2.4/index.html