Jedis 基本使用

引入 jedis 依赖：

<!-- https://mvnrepository.com/artifact/redis.clients/jedis -->
<!-- Dec 15, 2019 -->
<dependency>
    <groupId>redis.clients</groupId>
    <artifactId>jedis</artifactId>
    <version>3.2.0</version>
</dependency>

简单测试：

public class TestRedis {
    public static void main(String[] args) {
        Jedis jedis = new Jedis("localhost", 6379);
        jedis.set("foo", "bar");
        String value = jedis.get("foo");
        System.out.println(value);
    }
}

常用数据类型测试：

public class TestRedisCommands {
    private Jedis jedis;

    @Before
    public void setUp() {
        jedis = new Jedis("localhost", 6379);
    }

    @Test
    public void testBasicString(){
        jedis.set("name","meepo");
        System.out.println(jedis.get("name")); //执行结果：meepo

        jedis.append("name","dota");
        System.out.println(jedis.get("name")); //执行结果：meepodota

        jedis.set("name","poofu");
        System.out.println(jedis.get("name")); //执行结果：poofu 

        jedis.del("name");
        System.out.println(jedis.get("name")); //执行结果：null 

        jedis.mset("name","meepo","dota","poofu"); //同时设置多个字符串
        System.out.println(jedis.mget("name","dota"));
    } 

    @Test
    public void testMap(){
        Map<String, String> user = new HashMap<String, String>();
        user.put("name", "meepo");
        user.put("pwd", "password");
        user.put("age", "18");
        jedis.hmset("user", user);
        //结果是一个泛型的List
        //第一个参数是key，后面的参数是map中的对象的key，可以是多个
        List<String> rsmap = jedis.hmget("user", "name");
        System.out.println(rsmap);  //执行结果：[meepo]

        jedis.hdel("user","age");
        System.out.println(jedis.hmget("user", "age")); //执行结果：null
        System.out.println(jedis.hlen("user")); //执行结果：2
        System.out.println(jedis.exists("user"));//执行结果：true
        System.out.println(jedis.hkeys("user"));//执行结果：[pwd, name]
        System.out.println(jedis.hvals("user"));//执行结果：[meepo, password] 

        Iterator<String> iter=jedis.hkeys("user").iterator();
        while (iter.hasNext()){
            String key = iter.next();
            System.out.println(key+": "+jedis.hmget("user", key));
        }
    } 

    @Test
    public void testList(){
        System.out.println(jedis.lrange("user",0,-1));
        jedis.lpush("user","spring");
        jedis.lpush("user","struts");
        jedis.lpush("user","hibernate");
        System.out.println(jedis.lrange("user",0,-1));
    } 

    @Test
    public void testSet(){
        jedis.sadd("sname","meepo");
        jedis.sadd("sname","dota");
        jedis.sadd("sname","poofu");
        jedis.sadd("sname","noname");
        jedis.srem("sname","noname");
        System.out.println(jedis.smembers("sname")); //获取所有的value
        System.out.println(jedis.sismember("sname", "meepo"));//判断meepo是否为集合的元素
        System.out.println(jedis.srandmember("sname")); //随机获取一个元素
        System.out.println(jedis.scard("sname")); //返回集合的元素数量
    } 

    @Test
    public void test() throws InterruptedException {
        System.out.println(jedis.keys("*")); //返回当前库中所有的key
        System.out.println(jedis.keys("*name"));//返回的匹配的key
        System.out.println(jedis.del("sanmdde"));//删除key，成功返回1，失败返回0
        System.out.println(jedis.ttl("sname"));//返回key的有效时间，-1表示永远有效
        jedis.setex("mykey", 10, "seconds");//指定key的存活时间为10秒
        Thread.sleep(5000);
        System.out.println(jedis.ttl("mykey"));//剩余5秒
        System.out.println(jedis.exists("key"));//检查key是否存在
        System.out.println(jedis.rename("mykey","yourkey")); //重命名
        System.out.println(jedis.get("mykey"));//返回为null

        jedis.rpush("a","1");
        jedis.lpush("a","6");
        jedis.lpush("a","3");
        jedis.lpush("a","9");
        System.out.println(jedis.lrange("a",0,-1)); //[9, 3, 6, 1]
        System.out.println(jedis.sort("a")); //[1, 3, 6, 9]
        System.out.println(jedis.lrange("a",0,-1));
    }
}

命令参考：http://www.redis.cn/commands.html

API参考：https://tool.oschina.net/uploads/apidocs/redis/clients/jedis/Jedis.html