redis控制台命令及Util工具类
1. 增加和修改命令
114.116.53.167:0> set 0001 0001
"OK"
2. 查询命令
114.116.53.167:0>get 0001 "0001"
3. 删除命令
114.116.53.167:0>del 0001 "1"
4. 批量查询命令
114.116.53.167:0>keys * 114.116.53.167:0>keys 4FF52*
5. 批量删除
114.116.53.167:0>del 0001 0002 "2"
6. 引入的jar包
<!-- redis --> <dependency> <groupId>redis.clients</groupId> <artifactId>jedis</artifactId> <version>2.9.0</version> </dependency>
7. util工具类
package com.yunfan.util; 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 ="127.0.0.1"; //Redis的端口号 private static int PORT = 6379; //访问密码 private static String AUTH = "123456"; //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; /** * 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); } 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 String set(String key, String value) { try { value = StringUtils.isEmpty(value) ? "" : value; return getJedis().set(key, value); } catch (Exception e) { logger.error("Set key error : " + e); } return ""; } /** * 设置 过期时间 * * @param key * @param seconds 以秒为单位 * @param value */ public synchronized static void set(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 get(String key) { if (getJedis() == null || !getJedis().exists(key)) { return null; } return getJedis().get(key); } public static void main(String args[]){ //setString("q","aaa"); } }
8. util调用
JedisUtil.set("key", "value");
String value=JedisUtil.get("key");