Java的Redis连接池代码性能不错

其实这个是引用自网友http://blog.csdn.net/tuposky/article/details/45340183，有2个版本，差别就是ReentrantLock和synchronized。另外原作者使用了断言，我觉得这个还是不用为好。

ReentrantLock版

import java.util.concurrent.locks.ReentrantLock;
import org.apache.commons.lang.StringUtils;
import org.apache.log4j.Logger;
import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisPool;
import redis.clients.jedis.JedisPoolConfig;/*** Redis 工具类*/
public class JedisUtil {protected static ReentrantLock lockPool = new ReentrantLock();protected static ReentrantLock lockJedis = new ReentrantLock();protected static Logger logger = Logger.getLogger(JedisUtil.class);//Redis服务器IPprivate static String ADDR_ARRAY = "xxx.xxx.xxx.xxx";//Redis的端口号private static int PORT = 6379;//访问密码private static String AUTH = "http://blog.csdn.net/unix21";//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_ACTIVE = 8;//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 = 8;//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 = 3000;//超时时间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 = false;private static JedisPool jedisPool = null;/*** redis过期时间,以秒为单位*/public final static int EXRP_HOUR = 60 * 60;			//一小时public final static int EXRP_DAY = 60 * 60 * 24;		//一天public final static int EXRP_MONTH = 60 * 60 * 24 * 30;	//一个月/*** 初始化Redis连接池*/private static void initialPool() {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_ARRAY.split(",")[0], PORT, TIMEOUT, AUTH);} catch (Exception e) {logger.error("First create JedisPool error : " + e);try {//如果第一个IP异常，则访问第二个IPJedisPoolConfig 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_ARRAY.split(",")[1], PORT, TIMEOUT, AUTH);} catch (Exception e2) {logger.error("Second create JedisPool error : " + e2);}}}/*** 在多线程环境同步初始化*/private static void poolInit() {lockPool.lock();try {if (jedisPool == null) {initialPool();}} catch (Exception e) {e.printStackTrace();} finally {lockPool.unlock();}}public static Jedis getJedis() {lockJedis.lock();if (jedisPool == null) {poolInit();}Jedis jedis = null;try {if (jedisPool != null) {jedis = jedisPool.getResource();}} catch (Exception e) {logger.error("Get jedis error : " + e);} finally {returnResource(jedis);lockJedis.unlock();}return jedis;}/*** 释放jedis资源** @param jedis*/public static void returnResource(final Jedis jedis) {if (jedis != null && jedisPool != null) {jedisPool.returnResource(jedis);}}/*** 设置 String** @param key* @param value*/public synchronized static void setString(String key, String value) {try {value = StringUtils.isEmpty(value) ? "" : value;getJedis().set(key, value);} catch (Exception e) {logger.error("Set key error : " + e);}}/*** 设置 过期时间** @param key* @param seconds 以秒为单位* @param value*/public synchronized static void setString(String key, int seconds, String value) {try {value = StringUtils.isEmpty(value) ? "" : value;getJedis().setex(key, seconds, value);} catch (Exception e) {logger.error("Set keyex error : " + e);}}/*** 获取String值** @param key* @return value*/public synchronized static String getString(String key) {if (getJedis() == null || !getJedis().exists(key)) {return null;}return getJedis().get(key);}
}

synchronized版

import java.util.concurrent.locks.ReentrantLock;
import org.apache.commons.lang.StringUtils;
import org.apache.log4j.Logger;
import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisPool;
import redis.clients.jedis.JedisPoolConfig;/*** Redis 工具类*/
public class JedisUtil {protected static ReentrantLock lockPool = new ReentrantLock();protected static ReentrantLock lockJedis = new ReentrantLock();protected static Logger logger = Logger.getLogger(JedisUtil.class);//Redis服务器IPprivate static String ADDR_ARRAY = "xxx.xxx.xxx.xxx";//Redis的端口号private static int PORT = 6379;//访问密码private static String AUTH = "http://blog.csdn.net/unix21";//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_ACTIVE = 8;//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 = 8;//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 = 3000;//超时时间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 = false;private static JedisPool jedisPool = null;/*** redis过期时间,以秒为单位*/public final static int EXRP_HOUR = 60 * 60;			//一小时public final static int EXRP_DAY = 60 * 60 * 24;		//一天public final static int EXRP_MONTH = 60 * 60 * 24 * 30;	//一个月/*** 初始化Redis连接池*/private static void initialPool() {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_ARRAY.split(",")[0], PORT, TIMEOUT, AUTH);} catch (Exception e) {logger.error("First create JedisPool error : " + e);try {//如果第一个IP异常，则访问第二个IPJedisPoolConfig 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_ARRAY.split(",")[1], PORT, TIMEOUT, AUTH);} catch (Exception e2) {logger.error("Second create JedisPool error : " + e2);}}}/*** 在多线程环境同步初始化*/private static synchronized void poolInit() {if (jedisPool == null) {  initialPool();}}/*** 同步获取Jedis实例* @return Jedis*/public synchronized static Jedis getJedis() {  if (jedisPool == null) {  poolInit();}Jedis jedis = null;try {  if (jedisPool != null) {  jedis = jedisPool.getResource(); }} catch (Exception e) {  logger.error("Get jedis error : "+e);}finally{returnResource(jedis);}return jedis;}  /*** 释放jedis资源** @param jedis*/public static void returnResource(final Jedis jedis) {if (jedis != null && jedisPool != null) {jedisPool.returnResource(jedis);}}/*** 设置 String** @param key* @param value*/public synchronized static void setString(String key, String value) {try {value = StringUtils.isEmpty(value) ? "" : value;getJedis().set(key, value);} catch (Exception e) {logger.error("Set key error : " + e);}}/*** 设置 过期时间** @param key* @param seconds 以秒为单位* @param value*/public synchronized static void setString(String key, int seconds, String value) {try {value = StringUtils.isEmpty(value) ? "" : value;getJedis().setex(key, seconds, value);} catch (Exception e) {logger.error("Set keyex error : " + e);}}/*** 获取String值** @param key* @return value*/public synchronized static String getString(String key) {if (getJedis() == null || !getJedis().exists(key)) {return null;}return getJedis().get(key);}
}

多线程

public class ClientThread extends Thread {int i = 0;public ClientThread(int i) {this.i = i;}public void run() {Date date = new Date();DateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");String time = format.format(date);JedisUtil.setString("foo", time);String foo = JedisUtil.getString("foo");      System.out.println("【输出>>>>】foo:" + foo + " 第："+i+"个线程" +"当前时间："+DateUtil.getNowTimeString());}
}

起10000个线程

public static void main(String[] args) {              for (int i = 0; i < 10000; i++) {          ClientThread t = new ClientThread(i);t.start();}}

运行非常稳定：

在单机4核普通PC机器测试下来10000条数据跑了2秒，性能还是不错的，没有报异常。

下面是一个处理不好的情况，就会报出种种异常，这种连接池一定要用多线程测试，不然线下没事，线上就会时不时的出问题：

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