国际阿里云香港服务器！！！

• java连接上redis
• java操作redis的常见类型数据存储
• redis中的项目应用

1.java连接上redis

package com.zlj.ssm.redis;

import redis.clients.jedis.Jedis;

/**
 * @author zlj
 * @create 2023-11-03 19:27
 */
public class Demo1 {
    public static void main(String[] args) {
//        建立连接
        Jedis jedis=new Jedis("localhost",6379);
//        设置密码 ./src/redis-cli -h -p -a
        jedis.auth("123456");
//        测试连上与否 ping
        System.out.println(jedis.ping());
    }
}

2.java操作redis的常见类型数据存储

package com.zlj.ssm.redis;

import redis.clients.jedis.Jedis;

/**
 * @author zlj
 * @create 2023-11-03 19:27
 */
public class Demo2 {
    public static void main(String[] args) {
//        建立连接
        Jedis jedis=new Jedis("localhost",6379);
//        设置密码 ./src/redis-cli -h -p -a
        jedis.auth("123456");
//        测试连上与否 ping
        System.out.println(jedis.ping());

//        String的操作
//        set get del setex ttl
        jedis.select(3);
        jedis.set("test","牛逼");
        System.out.println(jedis.get("test"));
        jedis.setex("time",15,"运行需要花多少时间");
        System.out.println(jedis.ttl("time"));

        
    }
}

package com.zlj.ssm.redis;

import redis.clients.jedis.Jedis;

import java.util.HashMap;
import java.util.Map;

/**
 * @author zlj
 * @create 2023-11-03 19:27
 */
public class Demo3 {
    public static void main(String[] args) {
//        建立连接
        Jedis jedis=new Jedis("localhost",6379);
//        设置密码 ./src/redis-cli -h -p -a
        jedis.auth("123456");
//        测试连上与否 ping
        System.out.println(jedis.ping());

//        hset key attr1 val1 attr2 val2
//jedis.hset("user","name","liubing");
//jedis.hset("user","hobby","spa");
//jedis.hset("user","age","20");

Map map=new HashMap();
map.put("name","liuwen");
map.put("hobby","liuzhi");
map.put("age","28");
redisUtils.setHashMap(jedis,"user",map);

System.out.println(jedis.hget("user", "hobby"));
System.out.println(jedis.hgetAll("user"));
//删除
//long hdel=jedis.hdel("user","sex");
//jedis.del("user");
    }
}

package com.zlj.ssm.redis;

import redis.clients.jedis.Jedis;

/**
 * @author zlj
 * @create 2023-11-04 17:54
 */
public class Demo4 {
    public static void main(String[] args) {
//        建立连接
        Jedis jedis=new Jedis("localhost",6379);
//        设置密码 ./src/redis-cli -h -p -a
        jedis.auth("123456");
//        测试连上与否 ping
        System.out.println(jedis.ping());

        jedis.lpush("hobby","篮球","羽毛球","乒乓球","依优库","唱歌");
        System.out.println(jedis.lindex("hobby", 1));
        System.out.println(jedis.lrange("hobby", 0, 3));


    }
}

package com.zlj.ssm.redis;

import redis.clients.jedis.Jedis;

import java.util.Map;
import java.util.Set;

/**
 * @author zlj
 * @create 2023-11-04 17:09
 */
public class redisUtils {
    public static void setHashMap(Jedis jedis, String key, Map<String,String> map) {
         if(map!=null && map.size() > 0){
             Set<String> keys=map.keySet();
             for (String k : keys){
//                 key =name,hobby,age
//                 value map.get(name);
                jedis.hset(key,k,map.get(k));
             }

         }
    }
}

3.redis中的项目应用

import redis.clients.jedis.Jedis;

public class RedisExample {
    public static void main(String[] args) {
        // 连接 Redis 服务器
        Jedis jedis = new Jedis("localhost");

        // 创建一个 JSON 对象
        String jsonString = "{\"name\":\"John\", \"age\":30, \"city\":\"New York\"}";

        // 存储 JSON 对象到 Redis
        jedis.set("person", jsonString);

        // 从 Redis 获取 JSON 对象
        String storedJsonString = jedis.get("person");
        System.out.println("Stored JSON: " + storedJsonString);

        // 关闭 Redis 连接
        jedis.close();
    }
}

import com.fasterxml.jackson.databind.ObjectMapper; // import jackson package  
  
String jsonString = "{\"name\":\"John\", \"age\":30}"; // JSON string  
ObjectMapper mapper = new ObjectMapper(); // create an instance of ObjectMapper  
Person person = mapper.readValue(jsonString, Person.class); // convert json string to java object