其實這個是引用自網友http://blog.csdn.net/tuposky/article/details/45340183,有2個版本,差別就是ReentrantLock和synchronized。另外原作者使用了斷言,我覺得這個還是不用爲好。
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 工具類
*/
public class JedisUtil {
protected static ReentrantLock lockPool = new ReentrantLock();
protected static ReentrantLock lockJedis = new ReentrantLock();
protected static Logger logger = Logger.getLogger(JedisUtil.class);
//Redis服務器IP
private static String ADDR_ARRAY = "xxx.xxx.xxx.xxx";
//Redis的端口號
private static int PORT = 6379;
//訪問密碼
private static String AUTH = "http://blog.csdn.net/unix21";
//可用連接實例的最大數目,默認值爲8;
//如果賦值爲-1,則表示不限制;如果pool已經分配了maxActive個jedis實例,則此時pool的狀態爲exhausted(耗盡)。
private static int MAX_ACTIVE = 8;
//控制一個pool最多有多少個狀態爲idle(空閒的)的jedis實例,默認值也是8。
private static int MAX_IDLE = 8;
//等待可用連接的最大時間,單位毫秒,默認值爲-1,表示永不超時。如果超過等待時間,則直接拋出JedisConnectionException;
private static int MAX_WAIT = 3000;
//超時時間
private static int TIMEOUT = 10000;
//在borrow一個jedis實例時,是否提前進行validate操作;如果爲true,則得到的jedis實例均是可用的;
private static boolean TEST_ON_BORROW = false;
private static JedisPool jedisPool = null;
/**
* redis過期時間,以秒爲單位
*/
public final static int EXRP_HOUR = 60 * 60; //一小時
public final static int EXRP_DAY = 60 * 60 * 24; //一天
public final static int EXRP_MONTH = 60 * 60 * 24 * 30; //一個月
/**
* 初始化Redis連接池
*/
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 {
//如果第一個IP異常,則訪問第二個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);
}
}
}
/**
* 在多線程環境同步初始化
*/
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;
}
/**
* 釋放jedis資源
*
* @param jedis
*/
public static void returnResource(final Jedis jedis) {
if (jedis != null && jedisPool != null) {
jedisPool.returnResource(jedis);
}
}
/**
* 設置 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);
}
}
/**
* 設置 過期時間
*
* @param key
* @param seconds 以秒爲單位
* @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);
}
}
/**
* 獲取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 工具類
*/
public class JedisUtil {
protected static ReentrantLock lockPool = new ReentrantLock();
protected static ReentrantLock lockJedis = new ReentrantLock();
protected static Logger logger = Logger.getLogger(JedisUtil.class);
//Redis服務器IP
private static String ADDR_ARRAY = "xxx.xxx.xxx.xxx";
//Redis的端口號
private static int PORT = 6379;
//訪問密碼
private static String AUTH = "http://blog.csdn.net/unix21";
//可用連接實例的最大數目,默認值爲8;
//如果賦值爲-1,則表示不限制;如果pool已經分配了maxActive個jedis實例,則此時pool的狀態爲exhausted(耗盡)。
private static int MAX_ACTIVE = 8;
//控制一個pool最多有多少個狀態爲idle(空閒的)的jedis實例,默認值也是8。
private static int MAX_IDLE = 8;
//等待可用連接的最大時間,單位毫秒,默認值爲-1,表示永不超時。如果超過等待時間,則直接拋出JedisConnectionException;
private static int MAX_WAIT = 3000;
//超時時間
private static int TIMEOUT = 10000;
//在borrow一個jedis實例時,是否提前進行validate操作;如果爲true,則得到的jedis實例均是可用的;
private static boolean TEST_ON_BORROW = false;
private static JedisPool jedisPool = null;
/**
* redis過期時間,以秒爲單位
*/
public final static int EXRP_HOUR = 60 * 60; //一小時
public final static int EXRP_DAY = 60 * 60 * 24; //一天
public final static int EXRP_MONTH = 60 * 60 * 24 * 30; //一個月
/**
* 初始化Redis連接池
*/
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 {
//如果第一個IP異常,則訪問第二個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);
}
}
}
/**
* 在多線程環境同步初始化
*/
private static synchronized void poolInit() {
if (jedisPool == null) {
initialPool();
}
}
/**
* 同步獲取Jedis實例
* @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;
}
/**
* 釋放jedis資源
*
* @param jedis
*/
public static void returnResource(final Jedis jedis) {
if (jedis != null && jedisPool != null) {
jedisPool.returnResource(jedis);
}
}
/**
* 設置 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);
}
}
/**
* 設置 過期時間
*
* @param key
* @param seconds 以秒爲單位
* @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);
}
}
/**
* 獲取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);
}
}
多線程
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("【輸出>>>>】foo:" + foo + " 第:"+i+"個線程" +"當前時間:"+DateUtil.getNowTimeString());
}
}
起10000個線程
public static void main(String[] args) {
for (int i = 0; i < 10000; i++) {
ClientThread t = new ClientThread(i);
t.start();
}
}