Redis部分数据结构方法小结
package com.practice.util;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisPool;
import redis.clients.jedis.JedisPoolConfig;
public class RedisUtil {
private static final Log log = LogFactory.getLog(RedisUtil.class);
private static JedisPool jedisPool;//非切片连接池
private static final Object lock = new Object();
private static final int DEFAULT_TIME_OUT = 30000;
private static String redisIp = "192.168.77.153";
private static Integer redisPort = 7000;
/**
* 构建redis切片连接池
*
* @param ip
* @param port
* @return JedisPool
*/
public static JedisPool getJedisPool() {
if (jedisPool == null) {
synchronized (lock) {
if (jedisPool == null) {
JedisPoolConfig config = new JedisPoolConfig();
//设置连接池初始化大小和最大容量
// 控制一个pool可分配多少个jedis实例，通过pool.getResource()来获取；
// 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)。
config.setMaxTotal(-1);
// 控制一个pool最多有多少个状态为idle(空闲的)的jedis实例。
config.setMaxIdle(1000);
// 表示当borrow(引入)一个jedis实例时，最大的等待时间，如果超过等待时间，则直接抛出JedisConnectionException；
config.setMaxWaitMillis(1000 * 30);
// 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；
config.setTestOnBorrow(true);
// 写
jedisPool = new JedisPool(config, redisIp, redisPort,DEFAULT_TIME_OUT);
}
}
}
return jedisPool;
}
/**
* 返还到连接池
*
* @param pool
* @param redis
*/
public static void returnJedisResource(Jedis redis) {
if (redis != null) {
redis.close();
}
}
//直接set key-value
public static void setStructure(String key,String value){
JedisPool pool = null;
Jedis jedis = null;
try {
pool = getJedisPool();
jedis = pool.getResource();
jedis.set(key, value);
} catch (Exception e) {
log.error(e);
} finally {
//返还到连接池
returnJedisResource(jedis);
}
}
public static void getSetStructure(String key){
JedisPool pool = null;
Jedis jedis = null;
String value = "";
try {
pool = getJedisPool();
jedis = pool.getResource();
value = jedis.get(key);
System.out.println(value);
} catch (Exception e) {
log.error(e);
} finally {
//返还到连接池
returnJedisResource(jedis);
}
}
//通过key删除数据
public static void delKey(String key){
JedisPool pool = null;
Jedis jedis = null;
try {
pool = getJedisPool();
jedis = pool.getResource();
jedis.del(key);
System.out.println("del key success");
} catch (Exception e) {
log.error(e);
} finally {
//返还到连接池
returnJedisResource(jedis);
}
}
//mset相当于 jedis.set("key1","value1");jedis.set("key2","value2")
public static void msetData(String key1,String value1,String key2,String value2){
JedisPool pool = null;
Jedis jedis = null;
try {
pool = getJedisPool();
jedis = pool.getResource();
jedis.mset(key1,value1,key2,value2);
} catch (Exception e) {
log.error(e);
} finally {
//返还到连接池
returnJedisResource(jedis);
}
}
public static void flushData(){
JedisPool pool = null;
Jedis jedis = null;
try {
pool = getJedisPool();
jedis = pool.getResource();
jedis.flushAll();
System.out.println("flushAll success");
} catch (Exception e) {
log.error(e);
} finally {
//返还到连接池
returnJedisResource(jedis);
}
}
//判断key是否存在，如果存在则返回1，否则则返回0
public static boolean booleanExsit(String key){
JedisPool pool = null;
Jedis jedis = null;
Boolean exsit = false;
try {
pool = getJedisPool();
jedis = pool.getResource();
exsit = jedis.exists(key);
} catch (Exception e) {
log.error(e);
} finally {
//返还到连接池
returnJedisResource(jedis);
}
return exsit;
}
public static void appendData(String key,String data){
JedisPool pool = null;
Jedis jedis = null;
try {
pool = getJedisPool();
jedis = pool.getResource();
jedis.append(key, data);
} catch (Exception e) {
log.error(e);
} finally {
//返还到连接池
returnJedisResource(jedis);
}
}
//截取value的值
public static void getRange(String key){
JedisPool pool = null;
Jedis jedis = null;
try {
pool = getJedisPool();
jedis = pool.getResource();
String value = jedis.getrange(key, 0, 1);
System.out.println(value);
System.out.println();
} catch (Exception e) {
log.error(e);
} finally {
//返还到连接池
returnJedisResource(jedis);
}
}
//列表操作 用于将一个或多个值插入到列表的尾部(最右边), 如果列表不存在，一个空列表会被创建并执行 RPUSH 操作。 当列表存在但不是列表类型时，返回一个错误。
public static void rpush(String key){
JedisPool pool = null;
Jedis jedis = null;
try {
pool = getJedisPool();
jedis = pool.getResource();
jedis.rpush(key, "Hello how are you?");
jedis.rpush(key, "Fine thanks. I'm having fun with redis.");
jedis.rpush(key, "I should look into this NOSQL thing ASAP");
} catch (Exception e) {
log.error(e);
} finally {
//返还到连接池
returnJedisResource(jedis);
}
}
//取出列表中相应位置的值
public static void getPushValue(String key){
JedisPool pool = null;
Jedis jedis = null;
try {
pool = getJedisPool();
jedis = pool.getResource();
//第一个是key，第二个是起始位置，第三个是结束位置，jedis.llen获取长度 -1表示取得所有
List<String> values = jedis.lrange(key, 0, -1);
System.out.println(values);
} catch (Exception e) {
log.error(e);
} finally {
//返还到连接池
returnJedisResource(jedis);
}
}
public static void Set(String key){
JedisPool pool = null;
Jedis jedis = null;
try {
pool = getJedisPool();
jedis = pool.getResource();
jedis.sadd("myset", "1");
jedis.sadd("myset", "2");
jedis.sadd("myset", "3");
jedis.sadd("myset", "4");
Set<String> setValues = jedis.smembers("myset");
System.out.println(setValues);
} catch (Exception e) {
log.error(e);
} finally {
//返还到连接池
returnJedisResource(jedis);
}
}
public static void srem(String key){
JedisPool pool = null;
Jedis jedis = null;
try {
pool = getJedisPool();
jedis = pool.getResource();
jedis.srem(key, "4");
Set<String> setValues = jedis.smembers("myset");
System.out.println(setValues);
} catch (Exception e) {
log.error(e);
} finally {
//返还到连接池
returnJedisResource(jedis);
}
}
public static void hmset(){
JedisPool pool = null;
Jedis jedis = null;
try {
pool = getJedisPool();
jedis = pool.getResource();
Map<String, String> pairs = new HashMap<String, String>();
pairs.put("name", "Akshi");
pairs.put("age", "2");
pairs.put("sex", "Female");
jedis.hmset("kid", pairs);
List<String> name = jedis.hmget("kid", "name");
System.out.println(name);
} catch (Exception e) {
log.error(e);
} finally {
//返还到连接池
returnJedisResource(jedis);
}
}
public static void increment(){
JedisPool pool = null;
Jedis jedis = null;
try {
pool = getJedisPool();
jedis = pool.getResource();
jedis.hset("hashs", "entryKey", "1");
jedis.hset("hashs", "entryKey1", "entryValue1");
jedis.hset("hashs", "entryKey2", "entryValue2");
// 判断某个值是否存在
jedis.hexists("hashs", "entryKey");
System.out.println(jedis.hincrBy("hashs", "entryKey", 1));
} catch (Exception e) {
log.error(e);
} finally {
//返还到连接池
returnJedisResource(jedis);
}
}
Redis在工程开发中还是比较常用的Nosql内存数据库，简单巩固一下它的各种数据类型与用法~
