java redis api及test demo
1.CacheService.java
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
/** * */ 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
