项目集群的时候要用到二级缓存，趁着@红薯 终于舍得更新j2cache了，极速集成一波！

代码地址：

https://gitee.com/xiaoxustudent/JFinal-vue-element-admin/tree/master/admin/src/main/java/com/sandu/j2cache

1.Maven引用：吐槽一下，真的很多jar，不过下面都是可选的，主要看你用什么，我这里直接从红薯代码https://gitee.com/ld/J2Cache/blob/master/core/pom.xml 里面复制过来了。

<!-- https://mvnrepository.com/artifact/org.jsoup/jsoup --> 		 		<dependency> 			<groupId>net.oschina.j2cache</groupId> 			<artifactId>j2cache-core</artifactId> 			<version>2.1.0</version> 		</dependency> 		<dependency> 			<groupId>net.sf.ehcache</groupId> 			<artifactId>ehcache</artifactId> 			<version>2.10.4</version> 		</dependency>  		<dependency> 			<groupId>org.ehcache</groupId> 			<artifactId>ehcache</artifactId> 			<version>3.4.0</version> 		</dependency>  		<dependency> 			<groupId>com.github.ben-manes.caffeine</groupId> 			<artifactId>caffeine</artifactId> 			<version>2.6.1</version> 		</dependency>  		<dependency> 			<groupId>redis.clients</groupId> 			<artifactId>jedis</artifactId> 			<version>2.9.0</version> 			<type>jar</type> 			<scope>compile</scope> 		</dependency>  		<dependency> 			<groupId>org.jgroups</groupId> 			<artifactId>jgroups</artifactId> 			<version>3.6.13.Final</version> 		</dependency>  		<dependency> 			<groupId>de.ruedigermoeller</groupId> 			<artifactId>fst</artifactId> 			<version>2.53</version> 		</dependency>  		<dependency> 			<groupId>com.esotericsoftware</groupId> 			<artifactId>kryo-shaded</artifactId> 			<version>3.0.0</version> 		</dependency>  		<dependency> 			<groupId>org.xerial.snappy</groupId> 			<artifactId>snappy-java</artifactId> 			<version>1.1.4</version> 		</dependency>  		<dependency> 			<groupId>commons-beanutils</groupId> 			<artifactId>commons-beanutils</artifactId> 			<version>1.9.3</version> 		</dependency>

2.写个JFinal Plugin

package com.sandu.j2cache;  import com.jfinal.plugin.IPlugin;  import net.oschina.j2cache.CacheChannel; import net.oschina.j2cache.J2Cache;  public class J2CachePlugin implements IPlugin {     private static CacheChannel cache;      @Override     public boolean start() {         System.setProperty("java.net.preferIPv4Stack", "true"); //Disable IPv6 in JVM         cache = J2Cache.getChannel();         J2CacheKit.init(cache);         return true;     }      @Override     public boolean stop() {         cache.close();         return true;     } }

cache = J2Cache.getChannel() 拿到这个cache就完事了，可以调用各种api,这里我参考JFinal的cacheKit
小小封装了一个J2CacheKit，

3.配置文件

j2cache.properties  //这个必须的，里面有各种配置,我L1用了ehcache,详情看代码

j2cache.L1.provider_class = ehcache
j2cache.L2.provider_class = redis

network.xml //广播用的，不用管

ehcache.xml //ehcache配置文件，如果你用ehcache3,就用ehcache3.xml

4.测试，先开了redis服务

package com.sandu.j2cache;  import java.io.IOException;  import net.oschina.j2cache.J2Cache;  public class J2CacheTest { 	 	public static void main(String[] args) throws IOException { 		new J2CachePlugin().start(); 		String str1 = "高阁客竟去，小园花乱飞。参差连曲陌，迢递送斜晖。"; 		String str2 = "肠断未忍扫，眼穿仍欲归。芳心向春尽，所得是沾衣。"; 		String key1 = "ab1";  		String key2 = "ab2";  		String cacheName = "example"; 		 		//读写 		System.out.println("写入：" + str1); 		System.out.println("写入：" + str2); 		 		J2CacheKit.put(cacheName, key1, str1); 		J2CacheKit.put(cacheName, key2, str2); 		 		System.out.println("获取key1：" + J2CacheKit.get(cacheName, key1)); 		System.out.println("获取key2：" + J2CacheKit.get(cacheName, key2)); 		 //		//删除 		J2CacheKit.remove(cacheName, key1); 		System.out.println("删除：" + key1); 		System.out.println("删除后输出:"+key1 +  J2CacheKit.get(cacheName, key1)); 		System.out.println("删除后输出:"+key2 +  J2CacheKit.get(cacheName, key2)); //		 		//删除全部 		J2CacheKit.removeAll(cacheName); 		J2Cache.getChannel().clear(cacheName); 		System.out.println("删除全部数据："); 		System.out.println("删除后输出:"+key1 +  J2CacheKit.get(cacheName, key1)); 		System.out.println("删除后输出:"+key2 +  J2CacheKit.get(cacheName, key2)); 	}  } 

[main] INFO net.oschina.j2cache.J2Cache - Load J2Cache Config File : [/j2cache.properties]. [main] INFO net.oschina.j2cache.CacheProviderHolder - Using L1 CacheProvider : net.oschina.j2cache.ehcache.EhCacheProvider [main] INFO net.oschina.j2cache.CacheProviderHolder - Using L2 CacheProvider : net.oschina.j2cache.redis.RedisCacheProvider [main] INFO net.oschina.j2cache.redis.RedisPubSubClusterPolicy - Connected to redis channel:j2cache, time 74 ms. [main] INFO net.oschina.j2cache.J2Cache - Using cluster policy : net.oschina.j2cache.redis.RedisPubSubClusterPolicy 写入：高阁客竟去，小园花乱飞。参差连曲陌，迢递送斜晖。 写入：肠断未忍扫，眼穿仍欲归。芳心向春尽，所得是沾衣。 [main] INFO net.oschina.j2cache.util.SerializationUtils - Using Serializer -> [fst:net.oschina.j2cache.util.FSTSerializer] 获取key1：高阁客竟去，小园花乱飞。参差连曲陌，迢递送斜晖。 获取key2：肠断未忍扫，眼穿仍欲归。芳心向春尽，所得是沾衣。 删除：ab1 删除后输出:ab1null 删除后输出:ab2肠断未忍扫，眼穿仍欲归。芳心向春尽，所得是沾衣。 删除全部数据： 删除后输出:ab1null 删除后输出:ab2null 

5.总结

真正的代码只有J2CachePlugin和额外封装的J2CacheKit,另外j2cache 2.0版本 caffeine缓存下clear不生效，已反馈，在以后版本修复了。