Jedis学习（一）

开启掘金成长之旅！这是我参与「掘金日新计划 · 12 月更文挑战」的第18天，点击查看活动详情

Jedis连接和安装

1.修改redis.conf配置

• 绑定端口改成0.0.0.0
• 关闭保护模式
  

2.防火墙处理

• 防火墙添加6379端口

firewall-cmd --zone=public --add-port=6379/tcp --permanent

• 重启防火墙

firewall-cmd --reload

3.启动redis

• 查看端口

4.新建工程

• pom.xml引入redis客户端

<dependencies>
    <dependency>
        <groupId>redis.clients</groupId>
        <artifactId>jedis</artifactId>
        <version>2.9.0</version>
    </dependency>
</dependencies>

• 成功引入之后
  
• 连接redis(看到控制台输出redi连接成功，说明我们配置成功了)

5.设置key-value

代码说明：

jedis.set("fruit","apple");
jedis.mset(new String[]{"age","18","name","xiaoming"});
System.out.println(jedis.mget(new String[]{"age","name","fruit"}));

代码说明:

• jedis.set("fruit","apple"); :设置key和value
• jedis.mset(new String[]{"age","18","name","xiaoming"});:设置多个key
• jedis.mget(new String[]{"age","name","fruit"}):批量获取key

6.hash使用

jedis.hset("student:1","name","xiaoming");
System.out.println(jedis.hget("student:1","name"));
Map student = new HashMap<>();
student.put("name","hua");
student.put("age","80");
jedis.hmset("student",student);
System.out.println(jedis.hgetAll("student"));

代码说明：

• jedis.hset("student:1","name","xiaoming");：设置单独的hashMap,第一个是hash的名字，其他为key,val,key2,val2
• jedis.hmset("student",student);：student是hashMap的对象

7.list使用

jedis.del("list");
jedis.lpush("list",new String []{"a","b","c"});
jedis.rpush("list",new String[]{"h","i","j"});
//移出
jedis.lpop("list");
System.out.println(jedis.lrange("list",0 ,-1));

8.fastjson使用

pom中引入依赖

<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>fastjson</artifactId>
    <version>1.2.58</version>
</dependency>

List<Goods> goodsList  = new ArrayList<>();
goodsList.add(new Goods(1L,"test"));
goodsList.add(new Goods(2L,"haha"));
for (Goods goods:goodsList){
    String json = JSON.toJSONString(goods);
    String key = "good:"+String.valueOf(goods.getGoodsId());
    jedis.set(key,json);
}
//取出json
String goodKey = "good:1";
String goods = jedis.get(goodKey);
System.out.println(goods);
Goods goods1 = JSON.parseObject(goods,Goods.class);
System.out.println(goods1.getGoodsName());

代码说明：

• JSON.toJSONString(goods)：对象转成json
• JSON.parseObject(goods,Goods.class):json转对象