在java中操作redis

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    在普通项目中操作redis

    1.导入maven坐标

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

    2.打开redis在这里插入图片描述

    如果redis-server闪退那就先打开redis-cli 输入shutdown再exit就好啦。
    3.编写程序

    
    import org.junit.Test;
    import redis.clients.jedis.Jedis;
    
    import java.util.Set;
    
    /**
     * 使用Jedis操作Redis
     */
    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","xiaoming");
    
            String value = jedis.get("username");
            System.out.println(value);
    
            //jedis.del("username");
    
            jedis.hset("myhash","addr","bj");
            String hValue = jedis.hget("myhash", "addr");
            System.out.println(hValue);
    
            Set<String> keys = jedis.keys("*");
            for (String key : keys) {
                System.out.println(key);
            }
    
            //3 关闭连接
            jedis.close();
        }
    }
    
    

    在springboot中操作redis

    1. 导入坐标
     <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-data-redis</artifactId>
            </dependency>
    
    1. 编写yml文件
    spring:
      application:
        name: springdataredis_demo
      #Redis相关配置
      redis:
        host: localhost
        port: 6379
        #password: 123456
        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
    
    1. 编写redis配置类目的是重写redis对于key的序列化方式
    @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;
        }
    
    }
    
    1. 编写代码

      引入对象

      @Autowired
          private RedisTemplate redisTemplate;
      
      - 操作String类型数据
      
      public void testString(){
              redisTemplate.opsForValue().set("city123","beijing");
      
              String value = (String) redisTemplate.opsForValue().get("city123");
              System.out.println(value);
      
              redisTemplate.opsForValue().set("key1","value1",10l, TimeUnit.SECONDS);
      
              Boolean aBoolean = redisTemplate.opsForValue().setIfAbsent("city1234", "nanjing");
              System.out.println(aBoolean);
          }
      
      - 操作Hash类型数据
      
      public void testHash(){
              HashOperations hashOperations = redisTemplate.opsForHash();
      
              //存值
              hashOperations.put("002","name","xiaoming");
              hashOperations.put("002","age","20");
              hashOperations.put("002","address","bj");
      
              //取值
              String age = (String) hashOperations.get("002", "age");
              System.out.println(age);
      
              //获得hash结构中的所有字段
              Set keys = hashOperations.keys("002");
              for (Object key : keys) {
                  System.out.println(key);
              }
      
              //获得hash结构中的所有值
              List values = hashOperations.values("002");
              for (Object value : values) {
                  System.out.println(value);
              }
          }
      
      
      - 操作List类型的数据
      
      public void testList(){
              ListOperations listOperations = redisTemplate.opsForList();
      
              //存值
              listOperations.leftPush("mylist","a");
              listOperations.leftPushAll("mylist","b","c","d");
      
              //取值
              List<String> mylist = listOperations.range("mylist", 0, -1);
              for (String value : mylist) {
                  System.out.println(value);
              }
      
              //获得列表长度 llen
              Long size = listOperations.size("mylist");
              int lSize = size.intValue();
              for (int i = 0; i < lSize; i++) {
                  //出队列
                  String element = (String) listOperations.rightPop("mylist");
                  System.out.println(element);
              }
          }
      
        
      
      - 操作Set类型的数据
      
      public void testSet(){
              SetOperations setOperations = redisTemplate.opsForSet();
      
              //存值
              setOperations.add("myset","a","b","c","a");
      
              //取值
              Set<String> myset = setOperations.members("myset");
              for (String o : myset) {
                  System.out.println(o);
              }
      
              //删除成员
              setOperations.remove("myset","a","b");
      
              //取值
              myset = setOperations.members("myset");
              for (String o : myset) {
                  System.out.println(o);
              }
      
          }
      
      - 操作ZSet类型的数据
      
       public void testZset(){
              ZSetOperations zSetOperations = redisTemplate.opsForZSet();
      
              //存值
              zSetOperations.add("myZset","a",10.0);
              zSetOperations.add("myZset","b",11.0);
              zSetOperations.add("myZset","c",12.0);
              zSetOperations.add("myZset","a",13.0);
      
              //取值
              Set<String> myZset = zSetOperations.range("myZset", 0, -1);
              for (String s : myZset) {
                  System.out.println(s);
              }
      
              //修改分数
              zSetOperations.incrementScore("myZset","b",20.0);
      
              //取值
              myZset = zSetOperations.range("myZset", 0, -1);
              for (String s : myZset) {
                  System.out.println(s);
              }
      
              //删除成员
              zSetOperations.remove("myZset","a","b");
      
              //取值
              myZset = zSetOperations.range("myZset", 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
      
       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 itcast = redisTemplate.hasKey("itcast");
              System.out.println(itcast);
      
              //删除指定key
              redisTemplate.delete("myZset");
      
              //获取指定key对应的value的数据类型
              DataType dataType = redisTemplate.type("myset");
              System.out.println(dataType.name());
      
          }
      }
      
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  • 阿里云国际,腾讯云国际,低至75折。AWS 93折 免费开户实名账号 代冲值 优惠多多 微信号:monov8 飞机:@monov6
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