四 redis連線資料庫

     1.下載依賴jedis

       2.連線資料庫, 和redis一樣的操作命令, 關閉資源

//        連線Redis
        Jedis jedis = new Jedis("192.168.43.30", 6379);
//        操作Redis, jedis的操作命令和redis完全一樣
        jedis.set("name","coco");
        String name = jedis.get("name");
        System.out.println(name);
//        釋放資源
        jedis.close();

       3. 存物件.(物件要求k,v都必須是byte[])

           1.定義的物件必須實現Serializable 

@Data
@AllArgsConstructor
public class User implements Serializable {

    private int id;
    private String name;
    private Date brithday;

}

             2.將k,v都轉成byte[]

新增依賴, 可以利用SerializationUtils

 <dependency>

            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>5.2.12.RELEASE</version>
        </dependency>
 

        String key = "user";
        User value = new User(1,"tony",new Date());
//          2,將key value轉成byte[]
        byte[] key_b = key.getBytes();
       byte[] value_b = SerializationUtils.serialize(value);

//        3.儲存
        String set = jedis.set(key_b, value_b);
//        System.out.println(set);
//         4.獲取
        byte[] bytes = jedis.get(key_b);
        User user = (User)SerializationUtils.deserialize(bytes);
        System.out.println(user);