Redis java操作客户端

Jedis常用操作

　　1.测试连通性

Jedis jedis = new Jedis("192.168.1.201",6380,10000);
System.out.println(jedis.ping());

　　控制台打印

　　PONG

　　2. 5+1操作

 　　5中数据类型的操作：string list set hash zset

　　String 

　　String 没什么好说的，最长用的一种

Jedis jedis = new Jedis("192.168.1.201",6379);
        System.out.println(jedis.ping());
        
        jedis.set("k1", "v1");
        jedis.set("k2", "v2");
        jedis.set("k3", "v3");
        System.out.println(jedis.get("k1"));  //"v1"

　　List

　　lpush

jedis.lpush("list01", "1","2","3","4","5");  //lpush为先进后出 可以这么理解，从左侧开始入栈
System.out.println(jedis.lrange("list01", 0, -1));  //[5, 4, 3, 2, 1]

　　rpush

jedis.rpush("list02", "1","2","3","4","5");  //rpush为先进先出
System.out.println(jedis.lrange("list02", 0, -1)); //[1, 2, 3, 4, 5]

　　lpop

System.out.println(jedis.lpop("list01"));  //lpop 弹出栈顶数据 5
System.out.println(jedis.lrange("list01", 0, -1));  //[4, 3, 2, 1]

　　rpop

System.out.println(jedis.rpop("list02"));  //rpop 弹出栈底数据
System.out.println(jedis.lrange("list02", 0, -1)); //[1, 2, 3, 4]

　　lindex

System.out.println(jedis.lrange("list02", 0, -1));
System.out.println(jedis.lindex("list02", 0)); //LINDEX 按照索引下标获得元素(从上到下)

　　llen

System.out.println(jedis.lrange("list02", 0, -1)); //[1, 2, 3, 4]
System.out.println(jedis.llen("list02")); //LLEN 获取长度 4

　　lrem

jedis.rpush("list03", "1","1","1","2","2","2","3","3","3","4","4","4","5");
jedis.lrem("list03", 2, "3");  //删除 2 个 "3"
System.out.println(jedis.lrange("list03", 0, -1)); //[1, 1, 1, 2, 2, 2, 3, 4, 4, 4, 5]

　　ltrim

jedis.lpush("list04", "1","2","3","4","5","6","7","8");
System.out.println(jedis.lrange("list04", 0, -1)); //[8, 7, 6, 5, 4, 3, 2, 1]
jedis.ltrim("list04", 3, 5); //截取下标为3-5的数值，下表从0开始，再赋值给list01
System.out.println(jedis.lrange("list04", 0, -1));  //[5, 4, 3]

　　rpoplpush

jedis.lpush("list01", "1","2","3","4","5");
        System.out.println(jedis.lrange("list01", 0, -1));
        jedis.lpush("list02", "1","2","3");
        System.out.println(jedis.lrange("list02", 0, -1));
        jedis.rpoplpush("list01", "list02");//将一个数据弹出，使用rpop弹出的底部数据，lpush放入另一个中
        System.out.println(jedis.lrange("list01", 0, -1)); //[5, 4, 3, 2]
        System.out.println(jedis.lrange("list02", 0, -1)); //[1, 3, 2, 1]

　　lset

jedis.lset("list01", 1, "x"); //lset key index value 对index位置的进行赋值value [5, x, 3, 2]
System.out.println(jedis.lrange("list01", 0, -1));

　　linsert

System.out.println(jedis.lrange("list01", 0, -1)); //[5, x, 3, 2]
jedis.linsert("list01", LIST_POSITION.BEFORE, "x", "java"); //在 x 之前插入一个 java ，如果指定值有重复，则找到的是第一个
System.out.println(jedis.lrange("list01", 0, -1));

　　Set

 　　sadd/smembers

jedis.sadd("set01","1","1","2","2","3","3");  //sadd向一个set中添加数据
System.out.println(jedis.smembers("set01"));  //使用smembers 取出set中的所有数据 [3, 2, 1]

　　sismember

boolean flag1 = jedis.sismember("set01", "x");  //判断set中是否包含某个值
boolean flag2 = jedis.sismember("set01", "1");
System.out.println(flag1);  //false
System.out.println(flag2);  //true

 　　scard

long count = jedis.scard("set01");   //scard 获取set集合中元素个数
System.out.println(count);  //3

 　　srem

long remCount = jedis.srem("set01", "3");  //srem 删除set集合中的某个元素
System.out.println(remCount);  //1 表示删除成功
System.out.println(jedis.smembers("set01"));  //[2, 1]

 　　srandmember

jedis.sadd("set01", "3","4","5","6","7");
String srandmember = jedis.srandmember("set01");  //随机取出一个数
System.out.println(srandmember);  //2

　　spop

System.out.println(jedis.smembers("set01")); //[3, 2, 1, 7, 6, 5, 4]
jedis.spop("set01");  //随机出栈
System.out.println(jedis.smembers("set01"));  //[3, 2, 1, 7, 5, 4]

　　smove

System.out.println(jedis.smembers("set01"));  //[3, 2, 1, 7, 5, 4]
jedis.smove("set01", "set02", "2");  //将set01 中的值 2 移动到 set02 中
System.out.println(jedis.smembers("set01"));  //[3, 1, 7, 5, 4]
System.out.println(jedis.smembers("set02"));  //[2]

　　sdiff

System.out.println(jedis.smembers("set01"));
jedis.sadd("set02", "3","4","6");
System.out.println(jedis.smembers("set02"));
System.out.println(jedis.sdiff("set01","set02")); //在set01中，不在set02中的元素

　　sinter

System.out.println(jedis.smembers("set01"));
System.out.println(jedis.smembers("set02"));
System.out.println(jedis.sinter("set01","set02"));  //交集 两个集合中都含有的元素 [3, 4]

 　　sunion

System.out.println(jedis.smembers("set01"));  //[3, 1, 7, 5, 4]
System.out.println(jedis.smembers("set02"));  //[3, 2, 6, 4]
System.out.println(jedis.sunion("set01","set02"));  //并集 [3, 2, 1, 7, 6, 5, 4]

　　Hash

　　hset/hget

jedis.hset("user", "id", "1"); //hset K V 赋值一个hash 其中 V 为（key,value）
jedis.hset("user", "name", "z3"); //user为K, ("name","z3")为V
System.out.println(jedis.hget("user", "id"));  //1 hget获取hash值
System.out.println(jedis.hget("user", "name"));  //z3

　　hmset/hmget

        Map<String, String> customerMap = new HashMap<String, String>();
        customerMap.put("id", "1");
        customerMap.put("name", "z3");
        customerMap.put("age", "12");
        jedis.hmset("customer", customerMap); //使用hmset批量存储
        System.out.println(jedis.hmget("customer", "id","name","age"));  //hmget 批量获取 [1, z3, 12]

　　hgetAll

　　　　 System.out.println(jedis.hgetAll("customer")); //取出所有的key=value {id=1, name=z3, age=12}

　　hdel

        System.out.println(jedis.hgetAll("user"));  //{id=1, name=z3}
        jedis.hdel("user", "name");
        System.out.println(jedis.hgetAll("user"));  //{id=1}

　　hlen

        System.out.println(jedis.hgetAll("customer"));  //{id=1, name=z3, age=12}
        System.out.println(jedis.hlen("customer"));  //获取长度 3

　　hexist

        System.out.println(jedis.hgetAll("customer"));  //{id=1, name=z3, age=12}
        System.out.println(jedis.hexists("customer", "id"));  //true 判断某个map的key是否存在
        System.out.println(jedis.hexists("customer", "name"));  //true
        System.out.println(jedis.hexists("customer", "email"));  //false

　　hkeys/hvals

        System.out.println(jedis.hgetAll("customer"));  //{id=1, name=z3, age=12}
        System.out.println(jedis.hkeys("customer"));  //获取所有的key  [id, name, age]
        System.out.println(jedis.hvals("customer"));  //h获取所有的value  [12, z3, 1]

　　hincrBy

        System.out.println(jedis.hgetAll("customer"));  //{id=1, name=z3, age=12}
        System.out.println(jedis.hincrBy("customer", "age", 1)); //13

　　hsetnx

        //hsetnx 如果不存在则添加，如果存在不改变
        System.out.println(jedis.hsetnx("customer", "age", "20"));  //0
        jedis.hsetnx("customer", "email", "aa@aa.com");
        System.out.println(jedis.hgetAll("customer"));  //{id=1, email=aa@aa.com, name=z3, age=14}

　　

　　Zset  (Sorted set 有序集合)

　　zadd/zrange

        Map<Double, String> scoreMembers = new HashMap<>();
        scoreMembers.put(60.0, "v1");
        scoreMembers.put(70.0, "v2");
        scoreMembers.put(90.0, "v3");
        scoreMembers.put(85.5, "v4");
        scoreMembers.put(80.1, "v5");
        jedis.zadd("zset01", scoreMembers);
        System.out.println(jedis.zrange("zset01", 0, -1)); //[v1, v2, v5, v4, v3]

　　zrangeByScore key 开始score 结束score   （获取一个范围内的）

        System.out.println(jedis.zrangeByScore("zset01", 60.0, 80.2));  //[v1, v2, v5]

　　 ZRANGEBYSCORE zset01 60 90 limit 2 2 (在结果集中在截取)

　　　　 System.out.println(jedis.zrangeByScore("zset01", 60.0, 80.2, 2, 2));  //[v5]

　　zrem

        jedis.zrem("zset01", "v5");  //移除一个元素
        System.out.println(jedis.zrange("zset01", 0, -1)); //[v1, v2, v4, v3]

　　zcard

        System.out.println(jedis.zcard("zset01"));  //4  zcard 获取个数

　　zcount

　　　　 System.out.println(jedis.zcount("zset01", 60, 80));  //2 获取符合范围内的个数

　　zrank

        System.out.println(jedis.zrange("zset01", 0, -1)); //[v1, v2, v4, v3]
        System.out.println(jedis.zrank("zset01", "v2"));  //1 获取元素的下标 下标从0开始

　　zscore

        System.out.println(jedis.zrange("zset01", 0, -1)); //[v1, v2, v4, v3]
        System.out.println(jedis.zscore("zset01", "v2"));  //获取分数值 70.0

　　zrevrank

        System.out.println(jedis.zrevrank("zset01", "v3")); //0 逆序获得下标值

　　zrevrangeByScore

　　　　 System.out.println(jedis.zrevrangeByScore("zset01", 80, 60)); //[v2, v1]

　　3.事务提交

　　　　日常：

　　　　

Transaction transaction = jedis.multi();
        transaction.set("k4", "v44");
        transaction.set("k5", "v55");
//        transaction.exec();
        
        transaction.discard();

 　　　　加锁：

public class TestTx {

    public boolean transMethord() {
        Jedis jedis = new Jedis("192.168.1.201", 6380);
        int balance; // 余额
        int debt; // 欠额
        int amtToSubtract = 10; // 实刷额度
        
        jedis.set("balance", "100");
        jedis.set("debt", "0");

        jedis.watch("balance");
//Thread.sleep(7000);
        balance = Integer.parseInt(jedis.get("balance"));
        if (balance < amtToSubtract) {
            jedis.unwatch();
            System.out.println("modify");
            return false;
        } else {
            System.out.println("*********transaction***********");
            Transaction transaction = jedis.multi();
            transaction.decrBy("balance", amtToSubtract);
            transaction.incrBy("debt", amtToSubtract);
            transaction.exec();
            balance = Integer.parseInt(jedis.get("balance"));
            debt = Integer.parseInt(jedis.get("debt"));
            System.out.println("*******************" + balance);
            System.out.println("*******************" + debt);
            return true;
        }
    }
    /**
     * 通俗的讲，watch命令就是标记一个键，如果标记了一个键，
     * 在提交事务前如果该键被别人修改过，那事务就会失败，这种情况通常可以在程序中重新再尝试一次。
     * 首先标记了键balance，然后检查余额是否足够，不足就取消标记，并不做扣减；
     * 足够的话，就启动事务进行更新操作，如果在此期间键balance被其他人修改，那在提交事务(执行exec)时就会报错，
     * 程序中通常可以捕获这类错误在重新执行一次，直到成功。
     * @param args
     */
    public static void main(String[] args) {
        TestTx test = new TestTx();
        boolean retValue = test.transMethord();
        System.out.println("main retValue--------- " + retValue);
    }

}

　　如果在事务执行期间有进程修改了watch 的key ，则回滚事务

 　　修改程序 打开注释 

　　　　Thread.sleep(7000);

　　在期间 修改balance的值

127.0.0.1:6380> set balance 5
OK
127.0.0.1:6380> 

　　则程序运行结果为：

　　modify
　　main retValue--------- false

　　 4.主从复制

　　　6379

127.0.0.1:6379> info replication
# Replication
role:master
connected_slaves:1
slave0:ip=127.0.0.1,port=6380,state=online,offset=232636,lag=1
master_repl_offset:232636
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:232609
repl_backlog_histlen:28
127.0.0.1:6379> 

　　　　6380

127.0.0.1:6380> info replication
# Replication
role:slave
master_host:127.0.0.1
master_port:6379
master_link_status:up
master_last_io_seconds_ago:5
master_sync_in_progress:0
slave_repl_offset:232650
slave_priority:100
slave_read_only:1
connected_slaves:0
master_repl_offset:0
repl_backlog_active:0
repl_backlog_size:1048576
repl_backlog_first_byte_offset:2
repl_backlog_histlen:232718
127.0.0.1:6380> 

public class TestAPI {

    public static void main(String[] args) {
        Jedis jedis_M = new Jedis("192.168.1.201", 6379);
        Jedis jedis_S = new Jedis("192.168.1.201", 6380);
        
        jedis_M.set("k1", "v1");
        String v1 = jedis_S.get("k1");
        System.out.println(v1);  //"v1"
        
    }

}