1.CacheService.java
代码语言：javascript复制package com.redis.demo;
import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;
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;
@Component
public class CacheService {
private static Logger log = LoggerFactory.getLogger(CacheService.class);
@Autowired
private StringRedisTemplate redisTemplate;
private final String DEFAULT_KEY_PREFIX = "redisTest";
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
*/
public <K, V> void 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 <K, V> 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 <K, SK, V> 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 <K, SK, V> 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 <K, SK> 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 <K, V> V getObject(K key, Class<V> 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 <K, V> List<V> getList(K key, Class<V> clazz) {
String value = this.get(key);
List<V> 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 <K> 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<String> 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);
}
}2.CacheServiceTest.java
代码语言：javascript复制/**
*
*/
package com.redis.demo;
import org.junit.runner.RunWith;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
@RunWith(SpringJUnit4ClassRunner.class)
@SpringBootTest(classes=DemoApplication.class)
public class BaseTest {
}package com.redis.demo;
import com.alibaba.fastjson.JSON;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import java.util.ArrayList;
import java.util.List;
//@SpringBootTest
class DemoApplicationTests extends BaseTest{
@Autowired
CacheService cacheService;
@Test
void contextLoads() {
//添加string
cacheService.add("orderNumber",100);
String orderNumberValue = cacheService.get("orderNumber");
System.out.println("orderNumberValue=" orderNumberValue);
cacheService.addHashCache("loginmember","username","zhangsanfeng");
cacheService.addHashCache("loginmember","password","123456");
System.out.println("username=" cacheService.getHashCache("loginmember","username"));
System.out.println("password=" cacheService.getHashCache("loginmember","password"));
UserVo vo = new UserVo();
vo.setPassword("111111");
vo.setUsername("admin");
cacheService.add("userVo", vo);
System.out.println("object-username=" cacheService.getObject("userVo",UserVo.class).getUsername());
System.out.println("object-password=" cacheService.getObject("userVo",UserVo.class).getPassword());
List list = new ArrayList();
list.add(vo);
cacheService.add("userVoList", list);
List<UserVo> getList = cacheService.getList("userVoList",UserVo.class);
for (UserVo v:getList) {
System.out.println("对象=" JSON.toJSONString(v));
}
//key需要带上前缀，否则key不对
System.out.println("是否存在key=" cacheService.hasKey("userVoList"));
System.out.println("剩余的过期时间=" cacheService.getExpire("userVoList"));
//删除key
cacheService.delete("userVoList");
}
}3.测试运行结果
orderNumberValue=100 username=zhangsanfeng password=123456 object-username=admin object-password=111111 对象={"password":"111111","username":"admin"} 是否存在key=false 剩余的过期时间=-2
