springBoot整合redis使用介绍
pom文件中内容:
所使用到的关键依赖:
<!--springBoot集成redis--> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-redis</artifactId> <version>2.5.4</version> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> <version>2.5.4</version> </dependency> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <version>1.18.20</version> <optional>true</optional> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <version>2.5.4</version> <scope>test</scope> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-autoconfigure</artifactId> <version>2.5.4</version> </dependency> <dependency> <groupId>com.alibaba</groupId> <artifactId>fastjson</artifactId> <version>1.2.75</version> </dependency>
二、配置文件
server.port=8088 spring.redis.host=127.0.0.1 #Redis服务器连接端口 spring.redis.port=6379 #Redis服务器连接密码(默认为空) spring.redis.password=123456 #连接池最大连接数(使用负值表示没有限制) spring.redis.pool.max-active=8 #连接池最大阻塞等待时间(使用负值表示没有限制) spring.redis.pool.max-wait=-1 #连接池中的最大空闲连接 spring.redis.pool.max-idle=8 #连接池中的最小空闲连接 spring.redis.pool.min-idle=0 #连接超时时间(毫秒) spring.redis.timeout=30000
三、使用redis
package com.example.redis.cache; import com.alibaba.fastjson.JSON; import com.alibaba.fastjson.JSONArray; import com.alibaba.fastjson.JSONObject; import lombok.extern.slf4j.Slf4j; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.data.redis.core.StringRedisTemplate; import org.springframework.stereotype.Component; import org.springframework.util.StringUtils; import java.util.Collection; import java.util.Collections; import java.util.Date; import java.util.List; import java.util.concurrent.TimeUnit; /** * @author wxl * @date 2021-08-15 18:44 */ @Slf4j @Component public class CacheService { @Autowired private StringRedisTemplate redisTemplate; private final String DEFAULT_KEY_PREFIX = ""; private final int EXPIRE_TIME = 1; private final TimeUnit EXPIRE_TIME_TYPE = TimeUnit.DAYS; /** * 数据缓存至redis * * @param key * @param value * @return */ publicvoid add(K key, V value) { try { if (value != null) { redisTemplate .opsForValue() .set(DEFAULT_KEY_PREFIX + key, JSON.toJSONString(value)); } } catch (Exception e) { log.error(e.getMessage(), e); throw new RuntimeException("数据缓存至redis失败"); } } /** * 数据缓存至redis并设置过期时间 * * @param key * @param value * @return */ public void add(K key, V value, long timeout, TimeUnit unit) { try { if (value != null) { redisTemplate .opsForValue() .set(DEFAULT_KEY_PREFIX + key, JSON.toJSONString(value), timeout, unit); } } catch (Exception e) { log.error(e.getMessage(), e); throw new RuntimeException("数据缓存至redis失败"); } } /** * 写入 hash-set,已经是key-value的键值,不能再写入为hash-set * * @param key must not be {@literal null}. * @param subKey must not be {@literal null}. * @param value 写入的值 */ public void addHashCache(K key, SK subKey, V value) { redisTemplate.opsForHash().put(DEFAULT_KEY_PREFIX + key, subKey, value); } /** * 写入 hash-set,并设置过期时间 * * @param key must not be {@literal null}. * @param subKey must not be {@literal null}. * @param value 写入的值 */ public void addHashCache(K key, SK subKey, V value, long timeout, TimeUnit unit) { redisTemplate.opsForHash().put(DEFAULT_KEY_PREFIX + key, subKey, value); redisTemplate.expire(DEFAULT_KEY_PREFIX + key, timeout, unit); } /** * 获取 hash-setvalue * * @param key must not be {@literal null}. * @param subKey must not be {@literal null}. */ public Object getHashCache(K key, SK subKey) { return redisTemplate.opsForHash().get(DEFAULT_KEY_PREFIX + key, subKey); } /** * 从redis中获取缓存数据,转成对象 * * @param key must not be {@literal null}. * @param clazz 对象类型 * @return */ public V getObject(K key, Class clazz) { String value = this.get(key); V result = null; if (!StringUtils.isEmpty(value)) { result = JSONObject.parseObject(value, clazz); } return result; } /** * 从redis中获取缓存数据,转成list * * @param key must not be {@literal null}. * @param clazz 对象类型 * @return */ public List getList(K key, Class clazz) { String value = this.get(key); List result = Collections.emptyList(); if (!StringUtils.isEmpty(value)) { result = JSONArray.parseArray(value, clazz); } return result; } /** * 功能描述:Get the value of {@code key}. * * @param key must not be {@literal null}. * @return java.lang.String * @date 2021/9/19 **/ public String get(K key) { String value; try { value = redisTemplate.opsForValue().get(DEFAULT_KEY_PREFIX + key); } catch (Exception e) { log.error(e.getMessage(), e); throw new RuntimeException("从redis缓存中获取缓存数据失败"); } return value; } /** * 删除key */ public void delete(String key) { redisTemplate.delete(key); } /** * 批量删除key */ public void delete(Collection keys) { redisTemplate.delete(keys); } /** * 序列化key */ public byte[] dump(String key) { return redisTemplate.dump(key); } /** * 是否存在key */ public Boolean hasKey(String key) { return redisTemplate.hasKey(key); } /** * 设置过期时间 */ public Boolean expire(String key, long timeout, TimeUnit unit) { return redisTemplate.expire(key, timeout, unit); } /** * 设置过期时间 */ public Boolean expireAt(String key, Date date) { return redisTemplate.expireAt(key, date); } /** * 移除 key 的过期时间,key 将持久保持 */ public Boolean persist(String key) { return redisTemplate.persist(key); } /** * 返回 key 的剩余的过期时间 */ public Long getExpire(String key, TimeUnit unit) { return redisTemplate.getExpire(key, unit); } /** * 返回 key 的剩余的过期时间 */ public Long getExpire(String key) { return redisTemplate.getExpire(key); } }
1、添加字符串到redis
/** * 功能描述:添加字符串到redis */ @Test void add() { cacheService.add("test", 1234); }
结果:
2、将对象转换成jsonString并存入redis
/** * 功能描述:添加对象至redis */ @Test void addObject() { User user = User.builder() .id(ID) .name("小萌") .age(AGE) .build(); cacheService.add(user.getId(), user); }
结果:
3、将对象集合转换成jsonString,并设置过期时间存入至redis
/** * 功能描述:添加对象集合至redis */ @Test void addObjects() { ArrayListusers = new ArrayList<>(); User user = User.builder() .id(ID) .name("小萌") .age(AGE) .build(); users.add(user); cacheService.add("key", users, 1, TimeUnit.HOURS); }
结果:
4、获取对象
/** * 功能描述:获取对象 */ @Test void getObject() { User object = cacheService.getObject(ID, User.class); System.out.println("object = " + object); }
结果:
object = User(id=123, name=小萌, age=12)
5、获取对象集合
/** * 功能描述:获取对象集合 */ @Test void getObjects() { Listusers = cacheService.getList("key", User.class); System.out.println("users = " + users); }
结果:
users = [User(id=123, name=小萌, age=12)]
6、添加 hash-set
/** * 功能描述:添加 hash-set */ @Test void addHashCache() { cacheService.addHashCache("hashKey", "key", "value"); }
结果:
7、获取 hash-setvalue
/** * 获取 hash-setvalue * * @param key must not be {@literal null}. * @param subKey must not be {@literal null}. */ publicObject getHashCache(K key, SK subKey) { return redisTemplate.opsForHash().get(DEFAULT_KEY_PREFIX + key, subKey); }
结果:
hashCache = value