目前java操作redis的客户端有jedis跟Lettuce。在springboot1.x系列中，其中使用的是jedis,但是到了springboot2.x其中使用的是Lettuce。 因为我们的版本是springboot2.x系列，所以今天使用的是Lettuce。
关于jedis跟lettuce的区别：
- Lettuce 和 Jedis 的定位都是Redis的client，所以他们当然可以直接连接redis server。
- Jedis在实现上是直接连接的redis server，如果在多线程环境下是非线程安全的，这个时候只有使用连接池，为每个Jedis实例增加物理连接
- Lettuce的连接是基于Netty的，连接实例（StatefulRedisConnection）可以在多个线程间并发访问，应为StatefulRedisConnection是线程安全的，所以一个连接实例（StatefulRedisConnection）就可以满足多线程环境下的并发访问，当然这个也是可伸缩的设计，一个连接实例不够的情况也可以按需增加连接实例。
实现集成代码：
首先添加依赖：
<!--springboot中的redis依赖-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>
<!-- lettuce pool 缓存连接池-->
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-pool2</artifactId>
</dependency>
注意点：使用pool，那么必须在pom.xml添加上commons-pool2的依赖。没配置pool的话，可以不引用。
然后配置application.properties:
spring.redis.host=127.0.0.1
spring.redis.port=6379
#连接池最大链接数默认值为8
spring.redis.lettuce.pool.max-active=8
#连接池最大阻塞时间（使用负值表示没有限制）默认为-1
spring.redis.lettuce.pool.max-wait=-1
#连接池中的最大空闲连接数 默认为8
spring.redis.lettuce.pool.max-idle=8
#连接池中的最小空闲连接数 默认为8
spring.redis.lettuce.pool.min-idle=0
reids配置类：
接下来我们需要配置redis的key跟value的序列化方式，默认使用的JdkSerializationRedisSerializer 这样的会导致我们通过redis desktop manager显示的我们key跟value的时候显示不是正常字符。 所以我们需要手动配置一下序列化方式 新建一个config包，在其下新建一个RedisConfig.java 具体代码如下
package com.liu.studyredis.studyredis.config;
import org.springframework.cache.annotation.CachingConfigurerSupport;
import org.springframework.cache.annotation.EnableCaching;
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
@EnableCaching
public class RedisConfig extends CachingConfigurerSupport{
@Bean
RedisTemplate<String, Object> redisTemplate(RedisConnectionFactory redisConnectionFactory) {
RedisTemplate<String, Object> redisTemplate = new RedisTemplate<>();
redisTemplate.setConnectionFactory(redisConnectionFactory);
Jackson2JsonRedisSerializer jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer(Object.class);
// 设置值（value）的序列化采用Jackson2JsonRedisSerializer。
redisTemplate.setValueSerializer(jackson2JsonRedisSerializer);
// 设置键（key）的序列化采用StringRedisSerializer。
redisTemplate.setKeySerializer(new StringRedisSerializer());
redisTemplate.setHashKeySerializer(new StringRedisSerializer());
redisTemplate.afterPropertiesSet();
return redisTemplate;
}
}
自己封装的工具类：
package com.liu.studyredis.studyredis.util;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.BoundListOperations;
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 class RedisUtil {
@Autowired
private RedisTemplate<String, Object> redisTemplate;
public RedisUtil(RedisTemplate<String, Object> redisTemplate) {
this.redisTemplate = redisTemplate;
}
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;
}
}
public Set keys(String pattern){
return redisTemplate.keys(pattern);
}
public void convertAndSend(String channel, Object message){
redisTemplate.convertAndSend(channel,message);
}
public List<Object> rangeList(String listKey, long start, long end) {
//绑定操作
BoundListOperations<String, Object> boundValueOperations = redisTemplate.boundListOps(listKey);
//查询数据
return boundValueOperations.range(start, end);
}
public Object rifhtPop(String listKey){
//绑定操作
BoundListOperations<String, Object> boundValueOperations = redisTemplate.boundListOps(listKey);
return boundValueOperations.rightPop();
}
//=========BoundListOperations 用法 End============
}测试类：
package com.liu.studyredis.studyredis;
import com.liu.studyredis.studyredis.entity.User;
import com.liu.studyredis.studyredis.util.RedisUtil;
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.core.RedisTemplate;
@SpringBootTest
class StudyredisApplicationTests {
@Autowired
RedisTemplate redisTemplate;
@Autowired
RedisUtil redisUtil;
@Test
public void testInsert(){
User user = new User("LiYi",28);
redisUtil.set("LiYi",user);
}
}运行后结果：
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