在Spring中有一个类CachingUserDetailsService实现了UserDetailsService接口，该类使用静态代理模式为UserDetailsService提供缓存功能。该类源码如下：

CachingUserDetailsService.java

public class CachingUserDetailsService implements UserDetailsService { private UserCache userCache = new NullUserCache(); private final UserDetailsService delegate; CachingUserDetailsService(UserDetailsService delegate) { this.delegate = delegate; } public UserCache getUserCache() { return this.userCache; } public void setUserCache(UserCache userCache) { this.userCache = userCache; } public UserDetails loadUserByUsername(String username) { UserDetails user = this.userCache.getUserFromCache(username); if (user == null) { user = this.delegate.loadUserByUsername(username); } Assert.notNull(user, "UserDetailsService " + this.delegate + " returned null for username " + username + ". This is an interface contract violation"); this.userCache.putUserInCache(user); return user; }}

CachingUserDetailsService默认的userCache属性值为new NullUserCache()，该对象并未实现缓存。因为我打算使用EhCache来缓存UserDetails，所以需要使用Spring的EhCacheBasedUserCache类，该类是UserCache接口的实现类，主要是缓存操作。

缓存UserDetails到Ehcache的具体实现如下：

ehcache.xml

<?xml version="1.0" encoding="UTF-8"?><ehcache xmlns:xsi="http:///jeesun/oauthserver

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