之前做的项目用到了Memcached,用来存储图片验证码.不过需要设置过期时限.代码参照下面.

testMemcache.java

public void testMemcache(){ MemcacheUtil.set("abc","abc", new Date(1*10*1000)); MemcacheUtil.set("bbb","bbb", new Date(System.currentTimeMillis()+8000)); //大于2000为null try { Thread.sleep(1*8*1000); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } System.out.println(MemcacheUtil.get("abc")); System.out.println(MemcacheUtil.get("bbb")); try { Thread.sleep(1*1*1000); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } System.out.println(MemcacheUtil.get("abc")); System.out.println(MemcacheUtil.get("bbb")); try { Thread.sleep(1*1*1000); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } System.out.println(MemcacheUtil.get("abc")); System.out.println(MemcacheUtil.get("bbb")); }

MemcacheUtil.java

import java.util.Date; import com.danga.MemCached.MemCachedClient; public class MemcacheUtil { public static MemCachedClient getMemCachedClient() { return SpringContextUtils.getBean("memcachedClient", MemCachedClient.class); } public static boolean set(String key, Object value) { String newKey = ResourceUtil.getPropertyValue("jdbc.username") + key; return getMemCachedClient().set(newKey, value); } public static boolean set(String key, Object value,Date date) { String newKey = ResourceUtil.getPropertyValue("jdbc.username") + key; return getMemCachedClient().set(newKey, value, date); } public static Object get(String key) { String newKey = ResourceUtil.getPropertyValue("jdbc.username") + key; return getMemCachedClient().get(newKey); } public static boolean keyExists(String key) { String newKey = ResourceUtil.getPropertyValue("jdbc.username") + key; return getMemCachedClient().keyExists(newKey); } public static void clearCache(String...keys) { for (String key : keys) { String newKey = ResourceUtil.getPropertyValue("jdbc.username") + key; getMemCachedClient().delete(newKey); } } public static boolean clearCacheAll() { return getMemCachedClient().flushAll(); } /** * 删除缓存中的数据 * @param key */ public static boolean deleteCache(String key){ String newKey = ResourceUtil.getPropertyValue("jdbc.username") + key; return getMemCachedClient().delete(newKey); } }

输出结果：

abc

null

abc

null

null

null

原文出处：yaojian -> http://www.yaojian.me/2018/07/20/memcached%E7%9A%84memcachedclient%E8%AE%BE%E7%BD%AE%E8%BF%87%E6%9C%9F%E6%97%B6%E9%99%90/