java操作redis

使用Java来操作Redis，Jedis是Redis官方推荐使用的Java连接redis的客户端。

1 环境准备

1.1. 引入依赖

<dependency>
    <groupId>redis.clientsgroupId>
    <artifactId>jedisartifactId>
    <version>3.2.0version>
dependency>

<dependency>
    <groupId>com.alibabagroupId>
    <artifactId>fastjsonartifactId>
    <version>1.2.70version>
dependency>

1.2.创建jedis对象

 public static void main(String[] args) {
   //1.创建jedis对象
   Jedis jedis = new Jedis("192.168.75.101", 6379);//1.redis服务必须关闭防火墙  2.redis服务必须开启远程连接
   jedis.select(0);//选择操作的库默认0号库
   //2.执行相关操作
   //3.释放资源
   jedis.close();
 }

1. 开放端口6379

   firewall-cmd --zone=public --add-port=6379/tcp --permanet
   1
   

   重启防火墙服务

   systemctl restart firewalld.service
   

   1. 阿里云服务器控制台配置安全组

   2. 重启redis-server

      [root@AlibabaECS bin]# redis-server myconfig/redis.conf 
      

• 操作命令

  TestPing.java

  public class TestPing {
      public static void main(String[] args) {
          Jedis jedis = new Jedis("192.168.xx.xxx", 6379);
          String response = jedis.ping();
          System.out.println(response); // PONG
      }
  }
  

• 断开连接

1.3.事务

public class TestTX {
    public static void main(String[] args) {
        Jedis jedis = new Jedis("198.168.xxx.xx", 6379);

        JSONObject jsonObject = new JSONObject();
        jsonObject.put("hello", "world");
        jsonObject.put("name", "kuangshen");
        // 开启事务
        Transaction multi = jedis.multi();
        String result = jsonObject.toJSONString();
        // jedis.watch(result)
        try {
            multi.set("user1", result);
            multi.set("user2", result);
            // 执行事务
            multi.exec();
        }catch (Exception e){
            // 放弃事务
            multi.discard();
        } finally {
            // 关闭连接
            System.out.println(jedis.get("user1"));
            System.out.println(jedis.get("user2"));
            jedis.close();
        }
    }
}

2 操作key相关API

private Jedis jedis;
    @Before
    public void before(){
        this.jedis = new Jedis("192.168.XXX.XXX", 7000);
    }
    @After
    public void after(){
        jedis.close();
    }

    //测试key相关
    @Test
    public void testKeys(){
        //删除一个key
        jedis.del("name");
        //删除多个key
        jedis.del("name","age");

        //判断一个key是否存在exits
        Boolean name = jedis.exists("name");
        System.out.println(name);

        //设置一个key超时时间 expire pexpire
        Long age = jedis.expire("age", 100);
        System.out.println(age);

        //获取一个key超时时间 ttl
        Long age1 = jedis.ttl("newage");
        System.out.println(age1);

        //随机获取一个key
        String s = jedis.randomKey();

        //修改key名称
        jedis.rename("age","newage");

        //查看可以对应值的类型
        String name1 = jedis.type("name");
        System.out.println(name1);
        String maps = jedis.type("maps");
        System.out.println(maps);
    }

3操作String相关API

//测试 String 相关
    @Test
    public void testString(){
        //set
        jedis.set("name","秦羽");
        //get
        String s = jedis.get("name");
        System.out.println(s);
        //mset
        jedis.mset("content","tj","address","xqq");
        //mget
        List<String> mget = jedis.mget("name", "content", "address");
        mget.forEach(v-> System.out.println("v = " + v));
        //getset
        String set = jedis.getSet("name", "小明");
        System.out.println(set);

        //............
    }

4操作List相关API

//测试 List 相关
    @Test
    public void testList(){

        //lpush
        jedis.lpush("names1","张三","王五","赵柳","win7");

        //rpush
        jedis.rpush("names1","xiaomingming");

        //lrange

        List<String> names1 = jedis.lrange("names1", 0, -1);
        names1.forEach(name-> System.out.println("name = " + name));

        //lpop rpop
        String names11 = jedis.lpop("names1");
        System.out.println(names11);

        //llen
        jedis.linsert("lists", BinaryClient.LIST_POSITION.BEFORE,"xiaohei","xiaobai");

      	//........

    }

5操作Set的相关API

//测试SET相关
@Test
public void testSet(){

  //sadd
  jedis.sadd("names","zhangsan","lisi");

  //smembers
  jedis.smembers("names");

  //sismember
  jedis.sismember("names","qinyu");

  //...
}

6 操作ZSet相关API

//测试 ZSET 相关
@Test
public void testZset(){

  //zadd
  jedis.zadd("names",10,"张三");

  //zrange
  jedis.zrange("names",0,-1);

  //zcard
  jedis.zcard("names");

  //zrangeByScore
  jedis.zrangeByScore("names","0","100",0,5);

  //..

}

7 操作Hash相关API

//测试 HASH 相关
@Test
public void testHash(){
  //hset
  jedis.hset("maps","name","zhangsan");
  //hget
  jedis.hget("maps","name");
  //hgetall
  jedis.hgetAll("mps");
  //hkeys
  jedis.hkeys("maps");
  //hvals
  jedis.hvals("maps");
  //....
}