Redis专题(十三)-Redis的Java客户端Jedis

1.项目中添加redis和junit的依赖

<dependencies>

        <!-- jedis客户端 -->
        <dependency>
            <groupId>redis.clients</groupId>
            <artifactId>jedis</artifactId>
            <version>3.0.1</version>
        </dependency>

        <!--Junit测试依赖-->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
        </dependency>

    </dependencies>

2.创建JedisUtil工具类

/**
 * @author bruceliu
 * @create 2019-06-09 22:32
 * @description Jedis工具类
 */
public class JedisUtil {

    private static JedisUtil jedisUtil;

    private JedisUtil(){};

    public static JedisUtil getInstance(){
        if (jedisUtil == null){
            synchronized(JedisUtil.class){
                if (jedisUtil == null){
                    jedisUtil = new JedisUtil();
                }
            }
        }
        return jedisUtil;
    }

    //Jedis的连接池
    private static Map<String,JedisPool> maps = new HashMap<String,JedisPool>();

    private static JedisPool getPool(String ip, int port){
        String key = ip+":"+port;
        JedisPool pool = null;
        if(!maps.containsKey(key)){
            JedisPoolConfig config = new JedisPoolConfig();
            config.setMaxIdle(RedisConfig.MAX_IDLE);
            config.setMinIdle(RedisConfig.MIN_IDLE);
            config.setMaxTotal(RedisConfig.MAX_TOTAL);
            config.setMaxWaitMillis(RedisConfig.MAX_WAIT);
            config.setTestOnBorrow(true);
            config.setTestOnReturn(true);

            pool = new JedisPool(config,ip,port,RedisConfig.TIMEOUT);
            maps.put(key, pool);
        }else{
            pool = maps.get(key);
        }
        return pool;
    }

    public Jedis getJedis(String ip, int port){
        Jedis jedis = null;
        int count = 0;
        do{
            try{
                jedis = getPool(ip,port).getResource();
            }catch (Exception e){
                getPool(ip,port).close ();
            }
        }while(jedis == null && count<RedisConfig.RETRY_NUM);
        return jedis;
    }

    public void closeJedis(Jedis jedis, String ip, int port){
        if(jedis != null){
            getPool(ip,port).close();
        }
    }

    public static class RedisConfig {
        //最大实例总数
        public static int MAX_TOTAL = 150;

        //最大空闲连接数, 默认8个
        public static int MAX_IDLE = 100;

        //最小空闲连接数, 默认8个
        public static int MIN_IDLE = 10;

        //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JedisConnectionException；
        public static int MAX_WAIT = 10000;

        public static int TIMEOUT = 10000;

        public static int RETRY_NUM = 5;

        public RedisConfig(){};
    }
}

3.用Juint单元测试命令操作1.静态变量，ip,端口号

3.1.静态变量，ip,端口号

private static final String ipAddr = "192.168.16.XXX";
private static final int port = 6379;
private static Jedis jedis = null;

3.2.测试类方法执行之前从连接池中获取jedis对象，执行之后关闭jedis对象

@Before
public void init() { jedis = JedisUtil.getInstance().getJedis(ipAddr, port); }
@After
public void close() { JedisUtil.getInstance().closeJedis(jedis,ipAddr, port); }

3.1.静态变量，ip,端口号

4.对key操作的命令

@Test
public void testKey(){
    System.out.println("清空数据："+jedis.flushDB());
    System.out.println("判断某个键是否存在："+jedis.exists("username"));
    System.out.println("新增<'username','zzh'>的键值对："+jedis.set("username", "zzh"));
    System.out.println("新增<'password','password'>的键值对："+jedis.set("password", "password"));
    System.out.print("系统中所有的键如下：");
    Set<String> keys = jedis.keys("*");
    System.out.println(keys);
    System.out.println("删除键password:"+jedis.del("password"));
    System.out.println("判断键password是否存在："+jedis.exists("password"));
    System.out.println("查看键username所存储的值的类型："+jedis.type("username"));
    System.out.println("随机返回key空间的一个："+jedis.randomKey());
    System.out.println("重命名key："+jedis.rename("username","name"));
    System.out.println("取出改后的name："+jedis.get("name"));
    System.out.println("切换数据库(Redis默认有0-15个数据库)："+jedis.select(0));
    System.out.println("删除当前选择数据库中的所有key："+jedis.flushDB());
    System.out.println("返回当前数据库中key的数目："+jedis.dbSize());
    System.out.println("删除所有数据库中的所有key："+jedis.flushAll());
}

5.对String操作的命令

@Test
public void testString(){
    jedis.flushDB();
    System.out.println("===========增加数据===========");
    System.out.println(jedis.set("key1","value1"));
    System.out.println(jedis.set("key2","value2"));
    System.out.println(jedis.set("key3", "value3"));
    System.out.println("删除键key2:"+jedis.del("key2"));
    System.out.println("获取键key2:"+jedis.get("key2"));
    System.out.println("修改key1:"+jedis.set("key1", "value1Changed"));
    System.out.println("获取key1的值："+jedis.get("key1"));
    System.out.println("在key3后面加入值："+jedis.append("key3", "End"));
    System.out.println("key3的值："+jedis.get("key3"));
    System.out.println("增加多个键值对："+jedis.mset("key01","value01","key02","value02","key03","value03"));
    System.out.println("获取多个键值对："+jedis.mget("key01","key02","key03"));
    System.out.println("获取多个键值对："+jedis.mget("key01","key02","key03","key04"));
    System.out.println("删除多个键值对："+jedis.del(new String[]{"key01","key02"}));
    System.out.println("获取多个键值对："+jedis.mget("key01","key02","key03"));

    jedis.flushDB();
    System.out.println("===========新增键值对防止覆盖原先值==============");
    System.out.println(jedis.setnx("key1", "value1"));
    System.out.println(jedis.setnx("key2", "value2"));
    System.out.println(jedis.setnx("key2", "value2-new"));
    System.out.println(jedis.get("key1"));
    System.out.println(jedis.get("key2"));

    System.out.println("===========新增键值对并设置有效时间=============");
    System.out.println(jedis.setex("key3", 2, "value3"));
    System.out.println(jedis.get("key3"));
    try {
        TimeUnit.SECONDS.sleep(3);
    } catch (InterruptedException e) {
        e.printStackTrace();
    }
    System.out.println(jedis.get("key3"));

    System.out.println("===========获取原值，更新为新值==========");
    System.out.println(jedis.getSet("key2", "key2GetSet"));
    System.out.println(jedis.get("key2"));

    System.out.println("获得key2的值的字串："+jedis.getrange("key2", 2, 4));
}

6.对List操作命令

@Test
public void testList(){
    jedis.flushDB();
    System.out.println("===========添加一个list===========");
    //jedis.lpush("collections", "ArrayList", "Vector", "Stack", "HashMap", "WeakHashMap", "LinkedHashMap");
    jedis.lpush("collections", "HashSet");
    jedis.lpush("collections", "TreeSet");
    jedis.lpush("collections", "TreeMap");
    System.out.println("collections的内容："+jedis.lrange("collections", 0, -1));//-1代表倒数第一个元素，-2代表倒数第二个元素,end为-1表示查询全部
    System.out.println("collections区间0-3的元素："+jedis.lrange("collections",0,3));
    System.out.println("===============================");
    // 删除列表指定的值 ，第二个参数为删除的个数（有重复时），后add进去的值先被删，类似于出栈
    System.out.println("删除指定元素个数："+jedis.lrem("collections", 2, "HashMap"));
    System.out.println("collections的内容："+jedis.lrange("collections", 0, -1));
    System.out.println("删除下表0-3区间之外的元素："+jedis.ltrim("collections", 0, 3));
    System.out.println("collections的内容："+jedis.lrange("collections", 0, -1));
    System.out.println("collections列表出栈（左端）："+jedis.lpop("collections"));
    System.out.println("collections的内容："+jedis.lrange("collections", 0, -1));
    System.out.println("collections添加元素，从列表右端，与lpush相对应："+jedis.rpush("collections", "EnumMap"));
    System.out.println("collections的内容："+jedis.lrange("collections", 0, -1));
    System.out.println("collections列表出栈（右端）："+jedis.rpop("collections"));
    System.out.println("collections的内容："+jedis.lrange("collections", 0, -1));
    System.out.println("修改collections指定下标1的内容："+jedis.lset("collections", 1, "LinkedArrayList"));
    System.out.println("collections的内容："+jedis.lrange("collections", 0, -1));
    System.out.println("===============================");
    System.out.println("collections的长度："+jedis.llen("collections"));
    System.out.println("获取collections下标为2的元素："+jedis.lindex("collections", 2));
    System.out.println("===============================");
    //jedis.lpush("sortedList", "3","6","2","0","7","4");
    System.out.println("sortedList排序前："+jedis.lrange("sortedList", 0, -1));
    System.out.println(jedis.sort("sortedList"));
    System.out.println("sortedList排序后："+jedis.lrange("sortedList", 0, -1));
}

7.对Set的操作命令

@Test
public void testSet(){
    jedis.flushDB();
    System.out.println("============向集合中添加元素（不重复）============");
    System.out.println(jedis.sadd("eleSet", "e1","e2","e4","e3","e0","e8","e7","e5"));
    System.out.println(jedis.sadd("eleSet", "e6"));
    System.out.println(jedis.sadd("eleSet", "e6"));
    System.out.println("eleSet的所有元素为："+jedis.smembers("eleSet"));
    System.out.println("删除一个元素e0："+jedis.srem("eleSet", "e0"));
    System.out.println("eleSet的所有元素为："+jedis.smembers("eleSet"));
    System.out.println("删除两个元素e7和e6："+jedis.srem("eleSet", "e7","e6"));
    System.out.println("eleSet的所有元素为："+jedis.smembers("eleSet"));
    System.out.println("随机的移除集合中的一个元素："+jedis.spop("eleSet"));
    System.out.println("随机的移除集合中的一个元素："+jedis.spop("eleSet"));
    System.out.println("eleSet的所有元素为："+jedis.smembers("eleSet"));
    System.out.println("eleSet中包含元素的个数："+jedis.scard("eleSet"));
    System.out.println("e3是否在eleSet中："+jedis.sismember("eleSet", "e3"));
    System.out.println("e1是否在eleSet中："+jedis.sismember("eleSet", "e1"));
    System.out.println("e1是否在eleSet中："+jedis.sismember("eleSet", "e5"));
    System.out.println("=================================");
    System.out.println(jedis.sadd("eleSet1", "e1","e2","e4","e3","e0","e8","e7","e5"));
    System.out.println(jedis.sadd("eleSet2", "e1","e2","e4","e3","e0","e8"));
    System.out.println("将eleSet1中删除e1并存入eleSet3中："+jedis.smove("eleSet1", "eleSet3", "e1"));//移到集合元素
    System.out.println("将eleSet1中删除e2并存入eleSet3中："+jedis.smove("eleSet1", "eleSet3", "e2"));
    System.out.println("eleSet1中的元素："+jedis.smembers("eleSet1"));
    System.out.println("eleSet3中的元素："+jedis.smembers("eleSet3"));
    System.out.println("============集合运算=================");
    System.out.println("eleSet1中的元素："+jedis.smembers("eleSet1"));
    System.out.println("eleSet2中的元素："+jedis.smembers("eleSet2"));
    System.out.println("eleSet1和eleSet2的交集:"+jedis.sinter("eleSet1","eleSet2"));
    System.out.println("eleSet1和eleSet2的并集:"+jedis.sunion("eleSet1","eleSet2"));
    System.out.println("eleSet1和eleSet2的差集:"+jedis.sdiff("eleSet1","eleSet2"));//eleSet1中有，eleSet2中没有
    jedis.sinterstore("eleSet4","eleSet1","eleSet2");//求交集并将交集保存到dstkey的集合
    System.out.println("eleSet4中的元素："+jedis.smembers("eleSet4"));
}

8.对Hash的操作命令

@Test
public void testHash(){
    jedis.flushDB();
    Map<String,String> map = new HashMap<>();
    map.put("key1","value1");
    map.put("key2","value2");
    map.put("key3","value3");
    map.put("key4","value4");
    //添加名称为hash（key）的hash元素
    jedis.hmset("hash",map);
    //向名称为hash的hash中添加key为key5，value为value5元素
    jedis.hset("hash", "key5", "value5");
    System.out.println("散列hash的所有键值对为："+jedis.hgetAll("hash"));//return Map<String,String>
    System.out.println("散列hash的所有键为："+jedis.hkeys("hash"));//return Set<String>
    System.out.println("散列hash的所有值为："+jedis.hvals("hash"));//return List<String>
    System.out.println("将key6保存的值加上一个整数，如果key6不存在则添加key6："+jedis.hincrBy("hash", "key6", 6));
    System.out.println("散列hash的所有键值对为："+jedis.hgetAll("hash"));
    System.out.println("将key6保存的值加上一个整数，如果key6不存在则添加key6："+jedis.hincrBy("hash", "key6", 3));
    System.out.println("散列hash的所有键值对为："+jedis.hgetAll("hash"));
    System.out.println("删除一个或者多个键值对："+jedis.hdel("hash", "key2"));
    System.out.println("散列hash的所有键值对为："+jedis.hgetAll("hash"));
    System.out.println("散列hash中键值对的个数："+jedis.hlen("hash"));
    System.out.println("判断hash中是否存在key2："+jedis.hexists("hash","key2"));
    System.out.println("判断hash中是否存在key3："+jedis.hexists("hash","key3"));
    System.out.println("获取hash中的值："+jedis.hmget("hash","key3"));
    System.out.println("获取hash中的值："+jedis.hmget("hash","key3","key4"));
}

9.排序操作指令

@Test
public void testSort(){
    jedis.flushDB();
    //jedis.lpush("collections", "ArrayList", "Vector", "Stack", "HashMap", "WeakHashMap", "LinkedHashMap");
    jedis.lpush("collections","ArrayList");
    jedis.lpush("collections","Vector");
    jedis.lpush("collections","Stack");
    jedis.lpush("collections","HashMap");
    jedis.lpush("collections","WeakHashMap");
    jedis.lpush("collections","LinkedHashMap");
    System.out.println("collections的内容："+jedis.lrange("collections", 0, -1));
    SortingParams sortingParameters = new SortingParams();
    System.out.println(jedis.sort("collections",sortingParameters.alpha()));
    System.out.println("===============================");
    //jedis.lpush("sortedList", "3","6","2","0","7","4");
    jedis.lpush("sortedList","3");
    jedis.lpush("sortedList","6");
    jedis.lpush("sortedList","2");
    jedis.lpush("sortedList","0");
    jedis.lpush("sortedList","7");
    jedis.lpush("sortedList","4");
    System.out.println("sortedList排序前："+jedis.lrange("sortedList", 0, -1));
    System.out.println("升序："+jedis.sort("sortedList", sortingParameters.asc()));
    System.out.println("降序："+jedis.sort("sortedList", sortingParameters.desc()));
}

10.对Sorted-Sets操作

/**
 * @author bruceliu
 * @create 2019-06-09 22:43
 * @description 对Sorted-Sets操作
 */
public class TestSorted {

    private static final String ipAddr = "192.168.16.XXX";
    private static final int port = 6379;
    private static Jedis jedis = null;


    @Before
    public void init() { jedis = JedisUtil.getInstance().getJedis(ipAddr, port); }
    @After
    public void close() { JedisUtil.getInstance().closeJedis(jedis,ipAddr, port); }


    //对Sorted-Sets操作
    /**
     * Sorted-Sets和Sets类型极为相似，它们都是字符串的集合，都不允许重复的成员出现在一个Set中。
     *             它们之间的主要差别是Sorted-Sets中的每一个成员都会有一个分数(score)与之关联，Redis正是通过分数来为集合中的成员进行从小到大的排序。
     *             然而需要额外指出的是，尽管Sorted-Sets中的成员必须是唯一的，但是分数(score)却是可以重复的。
     *  在Sorted-Set中添加、删除或更新一个成员都是非常快速的操作，其时间复杂度为集合中成员数量的对数。
     *          由于Sorted-Sets中的成员在集合中的位置是有序的，因此，即便是访问位于集合中部的成员也仍然是非常高效的。
     * @throws Exception
     */
    @Test
    public void testSorted_Sets() throws Exception {
        jedis.flushAll();

        //添加一个分数为1的成员
        jedis.zadd("myzset", 1, "one");

        Map<String,Double> map = new LinkedHashMap<String,Double>();
        map.put("two", (double) 2);
        map.put("three", (double) 3);
        //添加两个分数分别是2和3的两个成员。
        jedis.zadd("myzset", map);//这个单独测一下

        //0表示第一个成员，-1表示最后一个成员。返回的结果中包含每个成员
        Set<String> zrange = jedis.zrange("myzset", 0, -1);
        System.out.println("zrange="+zrange);//zrange=[one, two, three]



        //获取成员one在Sorted-Set中的位置索引值。0表示第一个位置
        Long zrank = jedis.zrank("myzset", "one");
        System.out.println("zrank = "+zrank);//zrank = 0

        //成员four并不存在，因此返回null
        System.out.println(jedis.zrank("myzset", "four"));//null

        //#返回与myzset关联的Sorted-Set中，分数满足表达式1 <= score <= 2的成员的数量。
        Long zcount = jedis.zcount("myzset", 1, 2);
        System.out.println("zcount="+zcount);//zcount=2

        //获取myzset键中成员的数量。
        System.out.println(jedis.zcard("myzset"));//3

        //删除成员one和two，返回实际删除成员的数量。
        Long zrem = jedis.zrem("myzset", "one","two");
        System.out.println("zrem="+zrem);//zrem=2

        //查看是否删除成功。 获取键中成员的数量
        System.out.println(jedis.zcard("myzset"));//1

        //获取成员three的分数。返回值是字符串形式。
        Double zscore = jedis.zscore("myzset", "three");
        System.out.println("zscore="+zscore);//zscore=3.0

        //由于成员two已经被删除，所以该命令返回null
        System.out.println(jedis.zscore("myzset", "two"));//null

        //将成员three的分数增加2，并返回该成员更新后的分数。
        Double zincrby = jedis.zincrby("myzset", 2, "three");
        System.out.println("zincrby="+zincrby);//zincrby=5.0

        //将成员three的分数增加-1，并返回该成员更新后的分数。
        System.out.println(jedis.zincrby("myzset", -1, "three"));//4.0

        //====================》》》》》》
        jedis.del("myzset");

        Map<String,Double> map3 = new LinkedHashMap<String,Double>();
        map3.put("one", 1.0);
        map3.put("two", 2.0);
        map3.put("three", 3.0);
        map3.put("four", 4.0);
        //一次添加多个
        jedis.zadd("myzset",map3);

        //获取分数满足表达式1 <= score <= 2的成员。
        Set<String> zrangeByScore = jedis.zrangeByScore("myzset", 1, 2);
        System.out.println("zrangeByScore= "+zrangeByScore);zrangeByScore= [one, two]



        //删除分数满足表达式1 <= score <= 2的成员，并返回实际删除的数量。
        Long zremrangeByScore = jedis.zremrangeByScore("myzset", 1, 2);
        System.out.println("zremrangeByScore="+zremrangeByScore);//zremrangeByScore=2

        //看出一下上面的删除是否成功。
        System.out.println(jedis.zrange("myzset", 0, -1));//[three, four]


        //删除位置索引满足表达式0 <= rank <= 1的成员。返回实际删除的数量
        Long zremrangeByRank = jedis.zremrangeByRank("myzset", 0, 1);
        System.out.println("zremrangeByRank="+zremrangeByRank);//zremrangeByRank=2

        //查看上一条命令是否删除成功。
        Long zcard = jedis.zcard("myzset");
        System.out.println("zcard = "+zcard);//zcard = 0

        //======================>>>>>>>>>>>>>>>>>

        jedis.del("myzset");
        Map<String,Double> map2 = new LinkedHashMap<String,Double>();
        map2.put("one", 1.0);
        map2.put("two", 2.0);
        map2.put("three", 3.0);
        map2.put("four", 4.0);
        //一次添加多个
        jedis.zadd("myzset",map2);

        //以位置索引从高到低的方式获取并返回此区间内的成员。
        Set<String> zrevrange = jedis.zrevrange("myzset", 0, -1);
        System.out.println("zrevrange="+zrevrange);//zrevrange=[four, three, two, one]

        Set<String> zrevrange2 = jedis.zrevrange("myzset", 1, 3);
        System.out.println("zrevrange2="+zrevrange2);//zrevrange2=[three, two, one]

        //由于是从高到低的排序，所以one的位置是3。
        System.out.println(jedis.zrevrank("myzset", "one"));//3

        //由于是从高到低的排序，所以four的位置是0。
        System.out.println(jedis.zrevrank("myzset", "four"));//0

        //获取分数满足表达式3 >= score >= 0的成员，并以相反的顺序输出，即从高到底的顺序。
        System.out.println(jedis.zrevrangeByScore("myzset", 3, 0));//[three, two, one]

        System.out.println("数据：="+jedis.zrange("myzset", 0, -1));//数据：=[one, two, three, four]


        /**
         * zrangeByScoreWithScores(String key, double min, double max, int offset, int count)
         *     key:键
         *  min:最小分值
         *  max:最大分值
         *  offset:偏移量，也就是从哪个位置开始。
         *  count:元素个数
         *
         *  返回的元素用ASCII码表示的，该元素的值用double类型数据表示
         */
        System.out.println(jedis.zrangeByScoreWithScores("myzset", 2, 3, 0, 2));//[[[116, 119, 111],2.0], [[116, 104, 114, 101, 101],3.0]]

    }
}