How Redis is used in Java

1. First download the jar package and put it in your project

2. Practice

Package com.jianyuan.redisTest;

Import Java.util.Iterator;
Import java.util.List;
Import Java.util.Set;

Import Redis.clients.jedis.Jedis;

public class Redistest {

public static void Main (string[] args) {
Connect to a local Redis service
Jedis Jedis = new Jedis ("127.0.0.1", 6379);
Authority authentication
Jedis.auth ("wenhongyu66");
Jedis.select (0);
SYSTEM.OUT.PRINTLN ("Connection succeeded");
See if the service is running
System.out.println (Jedis.ping ());

Setting up Redis string data
Jedis.set ("Runoobkey", "www.runoob.com");
Get the stored data and output
System.out.println ("redis-stored string:" + jedis.get ("Runoobkey"));

Storing data in a list
Jedis.lpush ("Site-list", "Runoob");
Jedis.lpush ("Site-list", "Google");
Jedis.lpush ("Site-list", "Taobao");
System.out.println (Jedis.llen ("site-list"));
Get the stored data and output
list<string> list = Jedis.lrange ("Site-list", 0, Jedis.llen ("site-list"));
for (int i=0; i<list.size (); i++) {
SYSTEM.OUT.PRINTLN ("list item is:" +list.get (i));
}

Get the data and output
set<string> keys = Jedis.keys ("*");
Iterator<string> It=keys.iterator ();
while (It.hasnext ()) {
String key = It.next ();
SYSTEM.OUT.PRINTLN (key);
}

}

}

Summary: You can encapsulate some tool classes for ease of use, including connection pool configuration, Jedis parameter configuration and so on.

private static JedisPool jedisPool = null ; private static Jedis jedis; static {    jedis = getJedisPool().getResource(); } /**   * 构建redis连接池   */ public static JedisPool getJedisPool() {    if (jedisPool == null ) {      JedisPoolConfig config = new JedisPoolConfig();      config.setMaxTotal( 1024 ); // 可用连接实例的最大数目,如果赋值为-1,表示不限制.      config.setMaxIdle( 5 ); // 控制一个Pool最多有多少个状态为idle(空闲的)jedis实例,默认值也是8      config.setMaxWaitMillis( 1000 * 100 ); // 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,则直接抛出异常      config.setTestOnBorrow( true ); // 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      jedisPool = new JedisPool(config, "127.0.0.1" , 6379 );    }    return jedisPool; } /**   * 释放jedis资源   */ public static void returnResource(Jedis jedis) {    if (jedis != null ) {      jedis.close();    } } public static String get(String key) {    String value = null ;    Jedis jedis = null ;    try {      JedisPool pool = getJedisPool();      jedis = pool.getResource();      value = jedis.get(key);    }    catch (Exception e) {      returnResource(jedis);      e.printStackTrace();    }    finally {      returnResource(jedis);    }    return value; }The Redistemplate encapsulates the Jedis from the Jedispool and returns to the pool public class RedisTemplate {    private JedisPool jedisPool;    public RedisTemplate(JedisPool jedisPool) {      this .jedisPool = jedisPool;    }    public <T> T execute(RedisCallback<T> callback) {      Jedis jedis = jedisPool.getResource();      try {        return callback.handle(jedis);      }      catch (Exception e) {        // throw your exception        throw e;      }      finally {        returnResource(jedis);      }    }    private void returnResource(Jedis jedis) {      if (jedis != null ) {        jedis.close();      }    } } public interface RedisCallback<T> {    public T handle(Jedis jedis); }

How Redis is used in Java