Instance usage scenarios of redis in java

Redis is a Nosql caching technology that stores serialized data. If you use redis in java, you need to introduce an auxiliary jar. This article uses jedis-2.9.0.jar.

Since log4j is used in the project, all jars need to be introduced

JedisKit tool class

package com.iflytek.zhangh;

import org.apache.log4j.Logger;
import redis.clients.jedis.Jedis;

/**
 * Java 连接redis的工具辅助类redis
 * 
 * @author hzhang
 *
 */
public class JedisKit {

    public static Logger logger = Logger.getLogger(JedisKit.class);

    private JedisKit() {
    }

    private static JedisKit jedisKit = new JedisKit();
    private static Jedis jedis;
    static {
        jedis = new Jedis("127.0.0.1", 6379);
        jedis.auth("123456");//密码
        logger.info("jedis status: " + (jedis.ping().equals("PONG") ? "200" : "error"));
    }

    /**
     * jedis 初始化
     * 
     * @return
     */
    public static Jedis getJedis() {
        return jedis;
    }

    public static JedisKit getInstance() {
        return jedisKit;
    }

}

JedisTest test class

package com.iflytek.zhangh;

import org.junit.Test;
import redis.clients.jedis.Jedis;

/**
 * redis 测试类
 * @author Administrator
 *
 */
public class JedisTest{

    /**
     * 测试字符串
     */
    @Test
    public void testJedisString(){
        Jedis jedis = JedisKit.getJedis();
        jedis.set("demo", "abc");
        jedis.exists("demo");
        System.out.println("result= "+("abc".equals(jedis.get("demo"))));
    }

    /**
     * 测试哈希Hash
     */
    @Test
    public void testjedisHash(){
        Jedis jedis = JedisKit.getJedis();
        jedis.hset("key1", "field1", "name1");
        jedis.hset("key1", "field2", "name2");
        jedis.hset("key2", "field3", "name3");
        jedis.hset("key3", "field4", "name4");
        jedis.hset("key3", "field5", "name5");
        System.out.println(jedis.hgetAll("key1"));
        System.out.println(jedis.hget("key1", "field1"));
        System.out.println(jedis.hgetAll("key2"));
        System.out.println(jedis.hgetAll("key3"));
    }
    /**
     * 测试列表List
     */
    @Test
    public void testJedisList(){
        Jedis jedis = JedisKit.getJedis();
        jedis.lpush("studentNo", "zhangheng");
        jedis.lpush("studentNo", "lisi");
        System.out.println("length: "+jedis.llen("studentNo")+jedis.lrange("studentNo", 0, 10));
    }
    /**
     * 测试无序集合set
     */
    @Test
    public void testJedisSet(){
        Jedis jedis = JedisKit.getJedis();
        jedis.sadd("Name", "zhangheng1");
        jedis.sadd("Name", "zhangheng2");
        jedis.sadd("Name", "zhangheng4");
        jedis.sadd("Name", "zhangheng3");
        jedis.sadd("Name", "zhangheng3");//集合元素有唯一性 不会被插入
        jedis.sadd("Name2", "zhangheng3");
        jedis.sadd("Name2", "zhangheng4");
        System.out.println(jedis.scard("Name"));//获取集合的成员数
        System.out.println(jedis.smembers("Name"));//返回集合中的所有成员
    }

    /**
     * 测试有序集合（sorted set）
     */
    @Test
    public void testJedisZset(){
        Jedis jedis = JedisKit.getJedis();
        jedis.zadd("teacher", 0, "teacher1");
        jedis.zadd("teacher", 1, "teacher2");
        jedis.zadd("teacher", 2, "teacher4");
        jedis.zadd("teacher", 3, "teacher3");
        jedis.zadd("teacher", 4, "teacher33");
        jedis.zadd("teacher", 5, "teacher33");//成员具有唯一性
        System.out.println(jedis.zcard("teacher"));//获取集合的成员数
        System.out.println(jedis.zcount("teacher", 1, 3));//返回指定区间的成员数
        System.out.println(jedis.zrange("teacher", 0, -1));//0表示第一个元素 -1表示倒数第一个
    }
}

Please try the specific output results