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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IP private 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IP 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(",")[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); } }
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IP private 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IP 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(",")[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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原文地址:http://blog.csdn.net/unix21/article/details/51354823