文章目录
- Jedis
- 导入依赖
- 测试
- SpringBoot整合
- 导入依赖
- 配置连接
- 测试
- 序列化
- 工具类封装
Jedis
Jedis是Redis官方推荐的Java连接开发工具。
导入依赖
<dependency>
<groupId>redis.clients</groupId>
<artifactId>jedis</artifactId>
<version>3.3.0</version>
</dependency>
测试
记得先开启Redis服务
测试了下各API调用，和前两篇讲的命令基本一致，不再赘述。
package com.wzl;
import redis.clients.jedis.Jedis;
import redis.clients.jedis.Transaction;
public class Test {
public static void main(String[] args) {
//连接Redis
Jedis jedis=new Jedis("127.0.0.1",6379);
System.out.println(jedis.ping());
//测试String
jedis.set("s1","v1"); //设置值
System.out.println("s1值："+jedis.get("s1"));
jedis.append("s1","Append"); //增加串
System.out.println("s1子串："+jedis.getrange("s1",2,-1));
//测试List
jedis.lpush("l1","1","2"); //左入队
jedis.rpush("l1","3","4"); //右入队
System.out.println("l1第3个值："+jedis.lindex("l1",2));
//测试Geo
jedis.geoadd("city",116.40,19.40,"beijing"); //添加值
jedis.geoadd("city",121.47,31.23,"shanghai");
System.out.println("city元素个数："+jedis.zcard("city"));
System.out.println("北京到上海距离："+jedis.geodist("city","beijing","shanghai"));
//测试事务
jedis.set("card1","1000");
jedis.set("card2","1000");
Transaction multi = jedis.multi();//开启事务
try{
multi.decrBy("card1",200); //从卡1转200到卡2
multi.incrBy("card2",200);
multi.exec(); //执行事务
System.out.println("事务执行成功");
System.out.println("卡1余额："+jedis.get("card1"));
System.out.println("卡2余额："+jedis.get("card2"));
}catch (Exception e){
System.out.println("事务执行失败");
e.printStackTrace();
}finally{
jedis.close();//关闭连接
}
}
}
控制台结果：
redis客户端查看：
SpringBoot整合
导入依赖
新建Spring项目时勾选redis
或者直接在pom.xml添加：
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>
配置连接
在application.properties配置：
#配置redis
spring.redis.host=127.0.0.1
spring.redis.post=6379
测试
package com.wzl;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.data.redis.connection.RedisConnection;
import org.springframework.data.redis.core.RedisTemplate;
@SpringBootTest
class Redis02SpringbootApplicationTests {
@Autowired
private RedisTemplate redisTemplate;
@Test
void contextLoads() {
//API和命令是一样的， 命令类型前加opsFor
//比如opsForValue 操作String
//opsForList 操作List
//获取Redis连接对象
RedisConnection connection=redisTemplate.getConnectionFactory().getConnection();
connection.flushDb();
connection.flushAll();
connection.close();
//测试String
redisTemplate.opsForValue().set("k1","v1");
System.out.println("k1旧值："+redisTemplate.opsForValue().getAndSet("k1","V1111"));
System.out.println("k1新值："+redisTemplate.opsForValue().get("k1"));
//测试set
redisTemplate.opsForSet().add("a",1,2,3);
redisTemplate.opsForSet().add("b",2,3,4);
System.out.println("ab差集："+redisTemplate.opsForSet().difference("a","b"));//ab差集
System.out.println("ab并集："+redisTemplate.opsForSet().union("a","b"));//ab并集
//测试Hyperloglog
redisTemplate.opsForHyperLogLog().add("views","tom","jack","david");
redisTemplate.opsForHyperLogLog().add("views","jack","lisa","tom");
System.out.println("views:"+redisTemplate.opsForHyperLogLog().size("views"));//统计浏览量
}
}
控制台：
客户端：
序列化
怎么解决上面客户端乱码？可能是序列化方式不一样(默认Jdk)，我们需要把对象序列化，自定义redisTemplate，使用Jackson来序列化。
- RedisConfig
可以当作模板
package com.wzl.config;
import com.fasterxml.jackson.annotation.JsonAutoDetect;
import com.fasterxml.jackson.annotation.PropertyAccessor;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.connection.RedisConnectionFactory;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.serializer.Jackson2JsonRedisSerializer;
import org.springframework.data.redis.serializer.StringRedisSerializer;
@Configuration
public class RedisConfig {
@Bean
@SuppressWarnings("all")
public RedisTemplate<String, Object> redisTemplates(RedisConnectionFactory factory) {
RedisTemplate<String, Object> template = new RedisTemplate<String, Object>();
template.setConnectionFactory(factory);
//序列化配置，使用jackson，你也可以自定义
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);
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;
}
}
- Test
package com.wzl;
import com.wzl.pojo.User;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.data.redis.connection.RedisConnection;
import org.springframework.data.redis.core.RedisTemplate;
@SpringBootTest
class Redis02SpringbootApplicationTests {
@Autowired
@Qualifier("redisTemplates") //指定我们自定义的redisTemplate
private RedisTemplate redisTemplate;
@Test
void contextLoads() {
//API和命令是一样的， 命令类型前加opsFor
//比如opsForValue 操作String
//opsForList 操作List
//获取Redis连接对象
RedisConnection connection=redisTemplate.getConnectionFactory().getConnection();
connection.flushDb();
connection.flushAll();
connection.close();
//测试String
redisTemplate.opsForValue().set("k1","v1");
System.out.println("k1旧值："+redisTemplate.opsForValue().getAndSet("k1","V1111"));
System.out.println("k1新值："+redisTemplate.opsForValue().get("k1"));
//测试set
redisTemplate.opsForSet().add("a",1,2,3);
redisTemplate.opsForSet().add("b",2,3,4);
System.out.println("ab差集："+redisTemplate.opsForSet().difference("a","b"));//ab差集
System.out.println("ab并集："+redisTemplate.opsForSet().union("a","b"));//ab并集
//测试Hyperloglog
redisTemplate.opsForHyperLogLog().add("views","tom","jack","david");
redisTemplate.opsForHyperLogLog().add("views","jack","lisa","tom");
System.out.println("views:"+redisTemplate.opsForHyperLogLog().size("views"));//统计浏览量
}
}
控制台：
客户端：
（Jackson转义符 \ "）
工具类封装
使用底层原生代码还是比较繁琐，用工具类封装后就方便多了，直接调用即可，妙啊。
package com.wzl.utils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Component;
import org.springframework.util.CollectionUtils;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.TimeUnit;
@Component
public final class RedisUtil {
@Autowired
private RedisTemplate<String, Object> redisTemplate;
// =============================common============================
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;
}
}
public long getExpire(String key) {
return redisTemplate.getExpire(key, TimeUnit.SECONDS);
}
public boolean hasKey(String key) {
try {
return redisTemplate.hasKey(key);
} catch (Exception e) {
e.printStackTrace();
return false;
}
}
@SuppressWarnings("unchecked")
public void del(String... key) {
if (key != null && key.length > 0) {
if (key.length == 1) {
redisTemplate.delete(key[0]);
} else {
redisTemplate.delete(CollectionUtils.arrayToList(key));
}
}
}
// ============================String=============================
public Object get(String key) {
return key == null ? null : redisTemplate.opsForValue().get(key);
}
public boolean set(String key, Object value) {
try {
redisTemplate.opsForValue().set(key, value);
return true;
} catch (Exception e) {
e.printStackTrace();
return false;
}
}
public boolean set(String key, Object value, long time) {
try {
if (time > 0) {
redisTemplate.opsForValue().set(key, value, time, TimeUnit.SECONDS);
} else {
set(key, value);
}
return true;
} catch (Exception e) {
e.printStackTrace();
return false;
}
}
public long incr(String key, long delta) {
if (delta < 0) {
throw new RuntimeException("递增因子必须大于0");
}
return redisTemplate.opsForValue().increment(key, delta);
}
public long decr(String key, long delta) {
if (delta < 0) {
throw new RuntimeException("递减因子必须大于0");
}
return redisTemplate.opsForValue().increment(key, -delta);
}
// ================================Map=================================
public Object hget(String key, String item) {
return redisTemplate.opsForHash().get(key, item);
}
public Map<Object, Object> hmget(String key) {
return redisTemplate.opsForHash().entries(key);
}
public boolean hmset(String key, Map<String, Object> map) {
try {
redisTemplate.opsForHash().putAll(key, map);
return true;
} catch (Exception e) {
e.printStackTrace();
return false;
}
}
public boolean hmset(String key, Map<String, Object> map, long time) {
try {
redisTemplate.opsForHash().putAll(key, map);
if (time > 0) {
expire(key, time);
}
return true;
} catch (Exception e) {
e.printStackTrace();
return false;
}
}
public boolean hset(String key, String item, Object value) {
try {
redisTemplate.opsForHash().put(key, item, value);
return true;
} catch (Exception e) {
e.printStackTrace();
return false;
}
}
public boolean hset(String key, String item, Object value, long time) {
try {
redisTemplate.opsForHash().put(key, item, value);
if (time > 0) {
expire(key, time);
}
return true;
} catch (Exception e) {
e.printStackTrace();
return false;
}
}
public void hdel(String key, Object... item) {
redisTemplate.opsForHash().delete(key, item);
}
public boolean hHasKey(String key, String item) {
return redisTemplate.opsForHash().hasKey(key, item);
}
public double hincr(String key, String item, double by) {
return redisTemplate.opsForHash().increment(key, item, by);
}
public double hdecr(String key, String item, double by) {
return redisTemplate.opsForHash().increment(key, item, -by);
}
// ============================set=============================
public Set<Object> sGet(String key) {
try {
return redisTemplate.opsForSet().members(key);
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
public boolean sHasKey(String key, Object value) {
try {
return redisTemplate.opsForSet().isMember(key, value);
} catch (Exception e) {
e.printStackTrace();
return false;
}
}
public long sSet(String key, Object... values) {
try {
return redisTemplate.opsForSet().add(key, values);
} catch (Exception e) {
e.printStackTrace();
return 0;
}
}
public long sSetAndTime(String key, long time, Object... values) {
try {
Long count = redisTemplate.opsForSet().add(key, values);
if (time > 0)
expire(key, time);
return count;
} catch (Exception e) {
e.printStackTrace();
return 0;
}
}
public long sGetSetSize(String key) {
try {
return redisTemplate.opsForSet().size(key);
} catch (Exception e) {
e.printStackTrace();
return 0;
}
}
public long setRemove(String key, Object... values) {
try {
Long count = redisTemplate.opsForSet().remove(key, values);
return count;
} catch (Exception e) {
e.printStackTrace();
return 0;
}
}
// ===============================list=================================
public List<Object> lGet(String key, long start, long end) {
try {
return redisTemplate.opsForList().range(key, start, end);
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
public long lGetListSize(String key) {
try {
return redisTemplate.opsForList().size(key);
} catch (Exception e) {
e.printStackTrace();
return 0;
}
}
public Object lGetIndex(String key, long index) {
try {
return redisTemplate.opsForList().index(key, index);
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
public boolean lSet(String key, Object value) {
try {
redisTemplate.opsForList().rightPush(key, value);
return true;
} catch (Exception e) {
e.printStackTrace();
return false;
}
}
public boolean lSet(String key, Object value, long time) {
try {
redisTemplate.opsForList().rightPush(key, value);
if (time > 0)
expire(key, time);
return true;
} catch (Exception e) {
e.printStackTrace();
return false;
}
}
public boolean lSet(String key, List<Object> value) {
try {
redisTemplate.opsForList().rightPushAll(key, value);
return true;
} catch (Exception e) {
e.printStackTrace();
return false;
}
}
public boolean lSet(String key, List<Object> value, long time) {
try {
redisTemplate.opsForList().rightPushAll(key, value);
if (time > 0)
expire(key, time);
return true;
} catch (Exception e) {
e.printStackTrace();
return false;
}
}
public boolean lUpdateIndex(String key, long index, Object value) {
try {
redisTemplate.opsForList().set(key, index, value);
return true;
} catch (Exception e) {
e.printStackTrace();
return false;
}
}
public long lRemove(String key, long count, Object value) {
try {
Long remove = redisTemplate.opsForList().remove(key, count, value);
return remove;
} catch (Exception e) {
e.printStackTrace();
return 0;
}
}
}
请勿转载（本不富裕的访问量雪上加霜 ）
博主首页：https://blog.csdn.net/qq_45034708
你的点赞将会是我最大的动力，关注一波
