Redis常用命令以及如何在Java中操作Redis

<dependency>
    <groupId>redis.clients</groupId>
    <artifactId>jedis</artifactId>
    <version>2.8.0</version>
</dependency>

public class JedisTest {
    @Test
    public void testRedis(){
        //1 获取连接
        Jedis jedis = new Jedis("localhost",6379);
        //2 执行具体的操作
        jedis.set("username","zhangsan");
        String value = jedis.get("username");
        System.out.println(value);
        //3 关闭连接
        jedis.close();
    }
}

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>

spring:
  application:
    name: redisDemo
  #Redis相关配置
  redis:
    host: localhost
    port: 6379
    #password: 1234
    database: 0 #操作的是0号数据库
    jedis:
      #Redis连接池配置
      pool:
        max-active: 8 #最大连接数
        max-wait: 1ms #连接池最大阻塞等待时间
        max-idle: 4 #连接池中的最大空闲连接
        min-idle: 0 #连接池中的最小空闲连接

@Configuration
public class RedisConfig extends CachingConfigurerSupport {
    @Bean
    public RedisTemplate<Object, Object> redisTemplate(RedisConnectionFactory connectionFactory) {
        RedisTemplate<Object, Object> redisTemplate = new RedisTemplate<>();
        //默认的Key序列化器为：JdkSerializationRedisSerializer
        redisTemplate.setKeySerializer(new StringRedisSerializer());
        redisTemplate.setHashKeySerializer(new StringRedisSerializer());
        redisTemplate.setConnectionFactory(connectionFactory);
        return redisTemplate;
    }
}

@SpringBootTest
@RunWith(SpringRunner.class)
public class SpringDataRedisTest {
    @Autowired
    private RedisTemplate redisTemplate; 
}

/**
 * 操作String类型数据
*/
@Test
public void testString(){
    //存值
    redisTemplate.opsForValue().set("city","chengdu");
    //取值
    String value = (String) redisTemplate.opsForValue().get("city");
    System.out.println(value);
    //存值，同时设置过期时间
    redisTemplate.opsForValue().set("key1","value1",10l, TimeUnit.SECONDS);
    //存值，如果存在则不执行任何操作
    Boolean aBoolean = redisTemplate.opsForValue().setIfAbsent("city1", "xian");
    System.out.println(aBoolean);
}

/**
 * 操作Hash类型数据
*/
@Test
public void testHash(){
    HashOperations hashOperations = redisTemplate.opsForHash();
    //存值
    hashOperations.put("2023","name","lisi");
    hashOperations.put("2023","age","26");
    hashOperations.put("2023","address","chengdu");
    //取值
    String age = (String) hashOperations.get("2023", "age");
    System.out.println(age);
    //获得hash结构中的所有字段
    Set keys = hashOperations.keys("2023");
    for (Object key : keys) {
        System.out.println(key);
    }
    //获得hash结构中的所有值
    List values = hashOperations.values("2023");
    for (Object value : values) {
        System.out.println(value);
    }
}

/**
 * 操作List类型的数据
*/
@Test
public void testList(){
    ListOperations listOperations = redisTemplate.opsForList();
    //存值
    listOperations.leftPush("list1","a","b");
    listOperations.leftPushAll("list1","c","d");
    //取值
    List<String> mylist = listOperations.range("list1", 0, -1);
    for (String value : mylist) {
        System.out.println(value);
    }
    //获得列表长度 llen
    Long size = listOperations.size("list1");
    int lSize = size.intValue();
    for (int i = 0; i < lSize; i++) {
        //出队列
        String element = (String) listOperations.rightPop("list1");
        System.out.println(element);
    }
}

/**
 * 操作Set类型的数据
*/
@Test
public void testSet(){
    SetOperations setOperations = redisTemplate.opsForSet();
    //存值
    setOperations.add("set1","a","b","c","a");
    //取值
    Set<String> myset = setOperations.members("set1");
    for (String o : myset) {
        System.out.println(o);
    }
    //删除成员
    setOperations.remove("set1","a","b");
    //取值
    myset = setOperations.members("set1");
    for (String o : myset) {
        System.out.println(o);
    }
}

/**
 * 操作ZSet类型的数据
*/
@Test
public void testZset(){
    ZSetOperations zSetOperations = redisTemplate.opsForZSet();
    //存值
    zSetOperations.add("zset1","a",10.0);
    zSetOperations.add("zset1","b",11.0);
    zSetOperations.add("zset1","c",12.0);
    zSetOperations.add("zset1","a",13.0);
    //取值
    Set<String> myZset = zSetOperations.range("zset1", 0, -1);
    for (String s : myZset) {
        System.out.println(s);
    }
    //修改分数
    zSetOperations.incrementScore("zset1","b",20.0);
    //取值
    myZset = zSetOperations.range("zset1", 0, -1);
    for (String s : myZset) {
        System.out.println(s);
    }
    //删除成员
    zSetOperations.remove("zset1","a","b");
    //取值
    myZset = zSetOperations.range("zset1", 0, -1);
    for (String s : myZset) {
        System.out.println(s);
    }
}

/**
 * 通用操作，针对不同的数据类型都可以操作
*/
@Test
public void testCommon(){
    //获取Redis中所有的key
    Set<String> keys = redisTemplate.keys("*");
    for (String key : keys) {
        System.out.println(key);
    }
    //判断某个key是否存在
    Boolean crazy = redisTemplate.hasKey("crazy");
    System.out.println(crazy);
    //删除指定key
    redisTemplate.delete("zset1");
    //获取指定key对应的value的数据类型
    DataType dataType = redisTemplate.type("set1");
    System.out.println(dataType.name());
}