java中的接口是类吗
238
2022-10-03
远程连接Jedis和整合SpringBoot的详细过程
远程连接Jedis和整合SpringBoot的详细过程
目录一、远程连接Jedis1、导入Jedis所需的jar包2、远程连接Redis注意事项3、Jedis测试远程连接4、常用的数据类型5、Jedis实现事务二、整合SpringBoot1、导入依赖2、配置连接3、测试连接4、序列化5、自定义序列化6、自定义工具类7、再次进行测试
一、远程连接Jedis
1、导入Jedis所需的jar包
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
packaghttp://e 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
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
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
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
//为了开发方便，一般使用
RedisTemplate
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
// =============================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"));
}
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