RedisTemplate操作Redis數據結構-Hash類型

Redis中的hash結構如同java中的map，一個對象里有多個鍵值對，適合用來存儲對象。

SpringBoot中使用RedisTemplate執行Redis基本命令

在application.properties或application.yml文件中配置Redis

spring:
  redis:
    host: 127.0.0.1
    port: 6379

編寫代碼

package com.heaven.redis;

import lombok.extern.slf4j.Slf4j;
import org.junit.jupiter.api.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.serializer.RedisSerializer;
import org.springframework.data.redis.serializer.StringRedisSerializer;
import org.springframework.test.context.junit4.SpringRunner;
import redis.clients.jedis.Jedis;

import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;

@RunWith(SpringRunner.class)
@SpringBootTest
@Slf4j
class RedisApplicationTests {

    @Autowired
    RedisTemplate redisTemplate;

    @Test
    void testHash(){
        //設置生成key value的序列化策略
        RedisSerializer<String> stringSerializer = new StringRedisSerializer();
        redisTemplate.setKeySerializer(stringSerializer);
        redisTemplate.setValueSerializer(stringSerializer);
        redisTemplate.setHashKeySerializer(stringSerializer);
        redisTemplate.setHashValueSerializer(stringSerializer);

        String key = "hash";
        Map<String,String> map = new HashMap<>();
        map.put("f1","val1");
        map.put("f2","val2");
        //為hash結構設置多個鍵值對(hmset)
        redisTemplate.opsForHash().putAll(key,map);
        //獲取hash結構指定字段的value，單個key(hget)
        Object f1 = redisTemplate.opsForHash().get(key, "f1");
        log.info("f1========"+f1);
        //為hash結構設置單個鍵值對(hset)
        redisTemplate.opsForHash().put(key,"f3","val3");
        Object f3 = redisTemplate.opsForHash().get(key, "f3");
        log.info("f3========"+f3);
        //判斷hash結構中是否包含某字段(hexists)
        Boolean haskey = redisTemplate.opsForHash().hasKey(key, "f3");
        log.info("haskey========"+haskey);
        //獲取hash結構中所有的鍵值對(hgetall)
        Map<String,String> entries = redisTemplate.opsForHash().entries(key);
        for(Map.Entry<String,String> entry : entries.entrySet()){
            log.info(entry.getKey()+"======"+entry.getValue());
        }
        //獲取所有hash結構中所有的key(hkeys)
        Set<String> keys = redisTemplate.opsForHash().keys(key);
        for(String key1 : keys){
            log.info("key1=========="+keys);
        }
        //獲取hash結構中所有的value(hvals)
        List<String> values = redisTemplate.opsForHash().values(key);
        for(String value : values){
            log.info("value======="+value);
        }
        //獲取hash結構中指定key的value，可以是多個key（hmget）
        List<String> list = redisTemplate.opsForHash().multiGet(key, keys);
        for(String value2 : list){
            log.info("value2======="+value2);
        }
        //hash結構中若存在相應key才進行操作(hsetnx)
        Boolean success = redisTemplate.opsForHash().putIfAbsent(key, "f3", "6");
        log.info("succes======"+success);
        //刪除hash結構中指定的key(hdel)
        Long delete = redisTemplate.opsForHash().delete(key, "f1", "f2");
        log.info("delete=========="+delete);
    }
}

運行結果