远程连接Jedis和整合SpringBoot的详细过程

时间：2022-12-16 09:31:01|栏目：JAVA代码|点击：次

一、远程连接Jedis

1、导入Jedis所需的jar包

<dependency>
      <groupId>redis.clients</groupId>
      <artifactId>jedis</artifactId>
      <version>3.2.0</version>
    </dependency>

    <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>fastjson</artifactId>
      <version>1.2.62</version>
    </dependency>

2、远程连接Redis注意事项

禁用Linux的防火墙：systemctl stop/disable firewalld.service
在配置文件redis.conf中注释掉bind 127.0.0.1 ,然后修改protected-mode no

3、Jedis测试远程连接

package com.hcz;

import redis.clients.jedis.Jedis;

public class TestPing {
    public static void main(String[] args) {
        Jedis jedis = new Jedis("49.236.195.225",6379);

        System.out.println("连接成功："+jedis.ping());
        jedis.close();
    }
}

4、常用的数据类型

（1）Key

package com.hcz;

import redis.clients.jedis.Jedis;

import java.util.Set;

public class TestKey {
    public static void main(String[] args) {
        Jedis jedis = new Jedis("49.236.195.225",6379);

        System.out.println("连接成功："+jedis.ping());

        System.out.println("清空数据："+jedis.flushDB());
        System.out.println("判断某个键知否存在："+jedis.exists("username"));
        System.out.println("新增<'username','hcz'>的键值对"+jedis.set("username","hcz"));
        System.out.println("新增<'password','123'>的键值对"+jedis.set("password","123"));
        System.out.println("系统中所有的键如下：");
        Set<String> keys = jedis.keys("*");
        System.out.println(keys);

        System.out.println("获取username的值："+jedis.get("username"));
        System.out.println("获取password的值："+jedis.get("password"));

        System.out.println("删除键password"+jedis.del("password"));
        System.out.println("判断password是否存在："+jedis.exists("password"));

        System.out.println("查看键username所存储的值的类型："+jedis.type("username"));

        System.out.println("随机返回key空间的一个："+jedis.randomKey());

        System.out.println("重命名key："+jedis.rename("username","newname"));
        System.out.println("取出重命名后的newname:"+jedis.get("newname"));

        System.out.println("按索引查询："+jedis.select(0));

        System.out.println("清空当前数据库所有的key："+jedis.flushDB());
        System.out.println("返回当前数据库中key的数目："+jedis.dbSize());
        System.out.println("删除所有数据库中的key："+jedis.flushAll());

        jedis.close();
    }
}

（2）String

package com.hcz;

import redis.clients.jedis.Jedis;

import java.util.Set;
import java.util.concurrent.TimeUnit;

public class TestString {
    public static void main(String[] args) {
        Jedis jedis = new Jedis("139.196.236.217",6379);

        System.out.println("连接成功："+jedis.ping());

        System.out.println("清空数据："+jedis.flushDB());
        System.out.println("====增加数据====");
        System.out.println(jedis.set("k1","v1"));
        System.out.println(jedis.set("k2","v2"));
        System.out.println(jedis.set("k3","v3"));
        System.out.println("删除键k2:"+jedis.del("k2"));
        System.out.println("获取键k2:"+jedis.get("k2"));
        System.out.println("获取键k1:"+jedis.get("k1"));
        System.out.println("修改键k3:"+jedis.set("k3","new_v3"));
        System.out.println("获取k3的值："+jedis.get("k3"));
        System.out.println("在k3后面加值："+jedis.append("k3","End"));
        System.out.println("获取k3的值："+jedis.get("k3"));
        System.out.println("增加多个键值对："+jedis.mset("k4","v4","k5","v5"));
        System.out.println("获取多个键值对："+jedis.mget("k3","k4","k5"));
        System.out.println("删除多个键值对："+jedis.del("k1","k3"));

        System.out.println("清空数据："+jedis.flushDB());
        System.out.println("====新增键值对防止覆盖原先值====");
        System.out.println(jedis.setnx("k1","v1"));
        System.out.println(jedis.setnx("k2","v2"));
        System.out.println(jedis.setnx("k2","v2-new"));
        System.out.println("获取k1的值"+jedis.get("k1"));
        System.out.println("获取k2的值"+jedis.get("k2"));

        System.out.println("====新增键值并设置有效时间====");
        System.out.println(jedis.setex("k3",2,"v3"));
        System.out.println("第一次获取k3的值"+jedis.get("k3"));

        try {
            TimeUnit.SECONDS.sleep(3);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        System.out.println("第二次获取k3的值"+jedis.get("k3"));

        System.out.println("====获取原值，更新为新值=====");
        System.out.println(jedis.getSet("k2","k2-getset"));
        System.out.println(jedis.get("k2"));

        System.out.println("获得k2的值的字串："+jedis.getrange("k2",2,4));


        jedis.close();
    }
}

（3）List

package com.hcz;

import redis.clients.jedis.Jedis;

public class TestList {
    public static void main(String[] args) {
        Jedis jedis = new Jedis("49.236.195.225",6379);
        System.out.println("连接成功："+jedis.ping());
        System.out.println("清空数据："+jedis.flushDB());
        System.out.println("====增加一个list====");
        jedis.lpush("collections","ArrayList","Vector","Stack","HashMap","WeakHashMap","LinkedHashMap");
        jedis.lpush("collections","HashSet");
        jedis.lpush("collections","TreeSet");
        jedis.lpush("collections","TreeMap");
        System.out.println("collections的内容："+jedis.lrange("collections",0,-1));
        System.out.println("collections区间的0-3号元素："+jedis.lrange("collections",0,3));
        System.out.println("===========================");
        //删除指定的值，第二个参数为删除的个数（有重复时），后add进去的值先被删除，类似出栈
        System.out.println("删除指定元素个数"+jedis.lrem("collections",2,"HashMap"));
        System.out.println("collections的内容："+jedis.lrange("collections",0,-1));
        System.out.println("collections列表出栈（左端）："+jedis.lpop("collections"));
        System.out.println("collections的内容："+jedis.lrange("collections",0,-1));
        System.out.println("collections添加元素，从列表右端，与lpush相对应："+jedis.rpush("collections","List","Set","String"));
        System.out.println("collections的内容："+jedis.lrange("collections",0,-1));
        System.out.println("collections列表出栈（右端）："+jedis.rpop("collections"));
        System.out.println("collections的内容："+jedis.lrange("collections",0,-1));

        System.out.println("修改collections指定下标为1的内容："+jedis.lset("collections",1,"newHashSet"));
        System.out.println("collections的内容："+jedis.lrange("collections",0,-1));

        System.out.println("===============================");
        System.out.println("collections的长度："+jedis.llen("collections"));

        System.out.println("获取collections下标为2的元素："+jedis.lindex("collections",2));
        System.out.println("===============================");
        jedis.lpush("sortList","3","5","2","8","6","0");
        System.out.println("sortList排序前："+jedis.lrange("sortList",0,-1));
        System.out.println(jedis.sort("sortList"));
        System.out.println("sortList排序后："+jedis.lrange("sortList",0,-1));

        jedis.close();
    }
}

（4）Set

package com.hcz;

import redis.clients.jedis.Jedis;

import java.util.Set;

public class TestSet {
    public static void main(String[] args) {
        Jedis jedis = new Jedis("49.236.195.225",6379);

        System.out.println("连接成功："+jedis.ping());

        System.out.println("清空数据："+jedis.flushDB());
        System.out.println("==========向集合中添加元素（不重复）");
        System.out.println(jedis.sadd("eleSet","e1","e0","e3","e6","e5","e7","e8"));
        System.out.println(jedis.sadd("eleSet","e4"));
        System.out.println(jedis.sadd("eleSet","e4"));
        System.out.println("eleSet的所有元素为："+jedis.smembers("eleSet"));
        System.out.println("删除一个元素e0:"+jedis.srem("eleSet","e0"));
        System.out.println("eleSet的所有元素为："+jedis.smembers("eleSet"));
        System.out.println("删除二个元素e7，e6:"+jedis.srem("eleSet","e7","e6"));
        System.out.println("eleSet的所有元素为："+jedis.smembers("eleSet"));
        System.out.println("随机的移除集合中的一个元素："+jedis.spop("eleSet"));
        System.out.println("随机的移除集合中的一个元素："+jedis.spop("eleSet"));
        System.out.println("eleSet的所有元素为："+jedis.smembers("eleSet"));
        System.out.println("eleSet的元素个数为："+jedis.scard("eleSet"));
        System.out.println("e3是否存在eleSet中："+jedis.sismember("eleSet","e3"));
        System.out.println("e1是否存在eleSet中："+jedis.sismember("eleSet","e1"));
        System.out.println("e5是否存在eleSet中："+jedis.sismember("eleSet","e5"));
        System.out.println("==============================");

        System.out.println(jedis.sadd("eleSet1","e1","e0","e3","e6","e5","e7","e8"));
        System.out.println(jedis.sadd("eleSet2","e1","e0","e3","e6","e8"));
        System.out.println("将eleSet1删除e1并存入eleSet3中："+jedis.smove("eleSet1","eleSet3","e1"));
        System.out.println("将eleSet1删除e2并存入eleSet3中："+jedis.smove("eleSet1","eleSet3","e2"));
        System.out.println("eleSet1的所有元素为："+jedis.smembers("eleSet1"));
        System.out.println("eleSet3的所有元素为："+jedis.smembers("eleSet3"));

        System.out.println("================集合运算===============");
        System.out.println("eleSet1的所有元素为："+jedis.smembers("eleSet1"));
        System.out.println("eleSet2的所有元素为："+jedis.smembers("eleSet2"));
        System.out.println("eleSet1和eleSet2的交集："+jedis.sinter("eleSet1","eleSet2"));
        System.out.println("eleSet1和eleSet2的并集："+jedis.sunion("eleSet1","eleSet2"));
        System.out.println("eleSet1和eleSet2的差集："+jedis.sdiff("eleSet1","eleSet2"));
        jedis.sinterstore("eleSet4","eleSet1","eleSet2");//求交集并保存到eleSet4中
        System.out.println("eleSet4的所有元素为："+jedis.smembers("eleSet4"));


        jedis.close();
    }
}

（5）Hash

package com.hcz;

import redis.clients.jedis.Jedis;

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

public class TestHash {
    public static void main(String[] args) {
        Jedis jedis = new Jedis("49.236.195.225",6379);

        System.out.println("连接成功："+jedis.ping());
        System.out.println("清空数据："+jedis.flushDB());

        Map<String,String> map = new HashMap<>();
        map.put("key1","v1");
        map.put("key2","v2");
        map.put("key3","v3");
        map.put("key4","v4");
        //添加名称为hash的hash元素
        jedis.hmset("hash",map);
        //向名称为hash的hash中添加key为key5,value为v5元素
        jedis.hset("hash","key5","v5");
        System.out.println("散列hash的所有键值对为："+jedis.hgetAll("hash"));
        System.out.println("散列hash的所有键为："+jedis.hkeys("hash"));
        System.out.println("散列hash的所有值为："+jedis.hvals("hash"));
        System.out.println("将key6保存的值加上一个整数，如果key6不存在则添加key6:"+jedis.hincrBy("hash","key6",4));
        System.out.println("散列hash的所有键值对为："+jedis.hgetAll("hash"));
        System.out.println("删除一个或者多个键值对："+jedis.hdel("hash","key2","key4"));
        System.out.println("散列hash的所有键值对为："+jedis.hgetAll("hash"));
        System.out.println("散列hash的所有键值对个数为："+jedis.hlen("hash"));
        System.out.println("判断hash中是否存在key2："+jedis.hexists("hash","key2"));
        System.out.println("判断hash中是否存在key3："+jedis.hexists("hash","key3"));
        System.out.println("获取hash中的值："+jedis.hget("hash","key3"));
        System.out.println("获取hash中的值："+jedis.hmget("hash","key3","key5"));

        jedis.close();
    }
}

5、Jedis实现事务

（1）事务正常执行

public class TestMulti {
    public static void main(String[] args) {
        Jedis jedis = new Jedis("49.236.195.225",6379);

        System.out.println("连接成功："+jedis.ping());
        System.out.println("清空数据："+jedis.flushDB());

        JSONObject jsonObject = new JSONObject();
        jsonObject.put("hello","world");
        jsonObject.put("name","hcz");
        //开启事务
        Transaction multi = jedis.multi();
        String result = jsonObject.toJSONString();

        try {
            multi.set("user1",result);
            multi.set("user2",result);

            multi.exec();//执行事务
        }catch (Exception e){
            multi.discard();//放弃事务
            e.printStackTrace();
        }finally {
            System.out.println("user1为："+jedis.get("user1"));
            System.out.println("user2为："+jedis.get("user2"));
            jedis.close();//关闭连接
        }

    }
}

（2）事务编译时异常

public class TestMulti {
    public static void main(String[] args) {
        Jedis jedis = new Jedis("49.236.195.225",6379);

        System.out.println("连接成功："+jedis.ping());
        System.out.println("清空数据："+jedis.flushDB());

        JSONObject jsonObject = new JSONObject();
        jsonObject.put("hello","world");
        jsonObject.put("name","hcz");
        //开启事务
        Transaction multi = jedis.multi();
        String result = jsonObject.toJSONString();

        try {
            multi.set("user1",result);
            multi.set("user2",result);

            int i = 1/0;//代码抛出异常事务，执行失败

            multi.exec();//执行事务
        }catch (Exception e){
            multi.discard();//放弃事务
            e.printStackTrace();
        }finally {
            System.out.println("user1为："+jedis.get("user1"));
            System.out.println("user2为："+jedis.get("user2"));
            jedis.close();//关闭连接
        }

    }
}

二、整合SpringBoot

1、导入依赖

说明：

在SpringBoot2.x之后，原来使用的jedis被替换为了lettuce
jedis：采用直连，多个线程操作的话是不安全的，如果想要避免不安全，可以使用 jedis pool连接池！更像BIO模式lettuce：采用netty，实例可以再多个线程共享，不存在线程不安全的情况，可以减少线程数据！更像NIO模式

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>

2、配置连接

spring:
    redis:
      host: 49.236.195.225	#远程主机名
      port: 6379	#端口号
      jedis:
        pool:
          max-active: 8
          max-wait: -1ms
          max-idle: 500
          min-idle: 0
      lettuce:
        shutdown-timeout: 0ms

3、测试连接

@SpringBootTest
class SpringbootRedisApplicationTests {

    @Autowired
    private RedisTemplate redisTemplate;

    @Test
    void contextLoads() {

        //redisTemplate
        //opsForValue 操作字符串 类似String
        //opsForList  操作List   类型List
        //opsForSet
        //opsForHash
        //opsForZSet
        //opsForGeo
        //opsForHyperLogLog

        //获取连接对象
        RedisConnection connection = redisTemplate.getConnectionFactory().getConnection();
        connection.flushDb();
        //connection.flushAll();

        redisTemplate.opsForValue().set("myKey","myValue");
        System.out.println(redisTemplate.opsForValue().get("myKey"));
    }

}

4、序列化

@Component
@AllArgsConstructor
@NoArgsConstructor
@Data
//在企业中，我们所有的pojo都会序列化
public class User implements Serializable {

    private String name;
    private int age;
}

@Autowired
private RedisTemplate redisTemplate;	

@Test
public void test(){

    try {
        //真实开发一般使用json来传递对象
        User user = new User("张三 ", 18);
        //String  jsonUser = new ObjectMapper().writeValueAsString(user);
        redisTemplate.opsForValue().set("user",user);
        System.out.println(redisTemplate.opsForValue().get("user"));

    } catch (JsonProcessingException e) {
        e.printStackTrace();
    }


}

5、自定义序列化

@Configuration
public class RedisConfig {

    //自定义了一个RedisTemplate
  @Bean
  @SuppressWarnings("all")
  public RedisTemplate<String, Object> redisTemplate(RedisConnectionFactory factory) {
      //为了开发方便，一般使用<String, Object>
      RedisTemplate<String, Object> template = new RedisTemplate<String, Object>();
      template.setConnectionFactory(factory);

      //Json序列化配置
      Jackson2JsonRedisSerializer jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer(Object.class);
      ObjectMapper om = new ObjectMapper();
      om.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
      om.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);
      jackson2JsonRedisSerializer.setObjectMapper(om);
      //String的序列化
      StringRedisSerializer stringRedisSerializer = new StringRedisSerializer();

      // key采用String的序列化方式
      template.setKeySerializer(stringRedisSerializer);
      // hash的key也采用String的序列化方式
      template.setHashKeySerializer(stringRedisSerializer);
      // value序列化方式采用jackson
      template.setValueSerializer(jackson2JsonRedisSerializer);
      // hash的value序列化方式采用jackson
      template.setHashValueSerializer(jackson2JsonRedisSerializer);
      template.afterPropertiesSet();

      return template;
  }
}

6、自定义工具类

自定义工具类的好处：

已经帮我们将原生的redisTemplate.opsForValue().set() 复杂命令封装成一些简单的命令

@Component
public final class RedisUtil {

    @Autowired
    private RedisTemplate<String, Object> redisTemplate;

    // =============================common============================
    /**
     * 指定缓存失效时间
     * @param key  键
     * @param time 时间(秒)
     */
    public boolean expire(String key, long time) {
        try {
            if (time > 0) {
                redisTemplate.expire(key, time, TimeUnit.SECONDS);
            }
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }

…………省略后面一大堆代码…………

7、再次进行测试

@Autowired
private RedisUtil redisUtil;

@Test
public void test2(){
    redisUtil.set("username","hcz");
    System.out.println(redisUtil.get("username"));
    redisUtil.hset("hash","age",18);
    System.out.println(redisUtil.hget("hash","age"));
    redisUtil.hincr("hash","age",5);
    System.out.println(redisUtil.hget("hash","age"));
}