Redis基础 Jedis

Posted 2021-05-24 杀智勇双全杀

Redis基础（二） Jedis

• 概述
• Maven依赖
• 套路
• • 构建连接
  • 释放连接
  • 操作测试
  • • String操作
    • Hash操作
    • List操作
    • Set操作
    • Zset操作

Redis基础及简单使用

概述

当然是不可能手动一条一条命令操作Redis的，类似JDBC方式的做法就是Jedis。虽然Redis是C语言写的，但是借助Jedis的封装，Java依然可用很方便地操作Redis。

Talk is cheap, show me the code。

Maven依赖

在pom.xml填写：

    <dependencies>
        <!-- Jedis 依赖 -->
        <dependency>
            <groupId>redis.clients</groupId>
            <artifactId>jedis</artifactId>
            <version>3.2.0</version>
        </dependency>
        <!-- JUnit 4 依赖 -->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.13</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.0</version>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                    <encoding>UTF-8</encoding>
                </configuration>
            </plugin>
        </plugins>
    </build>

套路

JDBC的和爬虫中使用过的套路可以参考。

构建连接

Jedis jedis = null;

@Before
    public void getConnection() {
//方式一：直接构建一个连接对象
        //实例化一个客户端连接对象,指定服务端地址
//        jedis = new Jedis("node1",6379);
        //方式二：通过连接池来构建连接
        //构建连接池，并且配置连接池属性
        JedisPoolConfig jedisPoolConfig = new JedisPoolConfig();
        jedisPoolConfig.setMaxTotal(20);//最大连接数
        jedisPoolConfig.setMaxIdle(10);//最大空闲连接
        jedisPoolConfig.setMaxWaitMillis(1500);//最大等待时间
        //构建连接池:连接池配置对象，主机名，端口
        JedisPool jedisPool = new JedisPool(jedisPoolConfig, "node1", 6379);
        //从连接池中获取连接对象
        jedis = jedisPool.getResource();
    }

释放连接

@After
    public void close() {
        jedis.close();
    }

操作测试

模仿JDBC的套路，在中间插入测试代码即可。。。

String操作

@Test
    public void stringTest(){
        //set/get/incr/setex/expire/ttl/exists
//        jedis.set("s1","hadoop");
//        String s1 = jedis.get("s1");
//        System.out.println(s1);
//        jedis.set("s2","2");
//        jedis.incr("s2");
//        String s2 = jedis.get("s2");
//        System.out.println(s2);
//        jedis.expire("s2",20);
//        while(true){
//            System.out.println(jedis.ttl("s2"));
//        }
//        System.out.println(jedis.exists("s1"));
//        System.out.println(jedis.exists("s2"));
        jedis.setex("s2",10,"hive");
    }

Hash操作

    @Test
    public void hashTest(){
        //hset/hmset/hget/hgetall/hdel/hlen/hexists
//        jedis.hset("m1","name","zhangsan");
//        String name = jedis.hget("m1", "name");
//        System.out.println(name);
//        System.out.println("==========================");
//        Map<String,String> maps = new HashMap<>();
//        maps.put("age","20");
//        maps.put("sex","male");
//        jedis.hmset("m1",maps);
//        List<String> hmget = jedis.hmget("m1", "name", "age", "sex");
//        System.out.println(hmget);
        Map<String, String> m1 = jedis.hgetAll("m1");
        for(Map.Entry map1 : m1.entrySet()){
            System.out.println(map1.getKey()+"\\t"+map1.getValue());
        }

        jedis.hdel("m1","name");

        Long m11 = jedis.hlen("m1");
        System.out.println(m11);
        System.out.println(jedis.hexists("m1","name"));
        System.out.println(jedis.hexists("m1","age"));

    }

List操作

    @Test
    public void listTest(){
        //lpush/rpush/lrange/llen/lpop/rpop
        jedis.lpush("list1","1","2","3","4");
        jedis.rpush("list1","5","6","7","8");
        List<String> list1 = jedis.lrange("list1", 0, -1);
        System.out.println(list1);
        System.out.println(jedis.llen("list1"));
        jedis.lpop("list1");
        jedis.rpop("list1");
        System.out.println(jedis.lrange("list1",0,-1));
    }

Set操作

    @Test
    public void setTest(){
        //sadd/smembers/sismember/scard/srem
//        jedis.sadd("set1","1","4","5","4");
//        jedis.sadd("set1","1","1","6","6");
//        Set<String> set1 = jedis.smembers("set1");
//        System.out.println(set1);
        System.out.println(jedis.sismember("set1","2"));
        System.out.println(jedis.sismember("set1","1"));
        System.out.println(jedis.scard("set1"));
        jedis.srem("set1","1");
        System.out.println(jedis.sismember("set1","1"));
    }

Zset操作

    @Test
    public void zsetTest(){
        //zadd/zrange/zrevrange/zcard/zrem
//        jedis.zadd("zset1",20,"yuwen");
//        jedis.zadd("zset1",99,"yingyu");
//        jedis.zadd("zset1",30,"shengwu");
//        jedis.zadd("zset1",55,"wuli");
        Set<String> zset1 = jedis.zrange("zset1", 0, -1);
//        Set<Tuple> zset1 = jedis.zrevrangeWithScores("zset1", 0, -1);
//        System.out.println(zset1);
        System.out.println(jedis.zcard("zset1"));
        jedis.zrem("zset1","shengwu");
        System.out.println(jedis.zrevrangeWithScores("zset1", 0, -1));
    }