详解Spring Boot Oauth2缓存UserDetails到Ehcache

详解Spring Boot Oauth2缓存UserDetails到Ehcache

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UserDetai

lsService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

xsi:noNamespaceSchemaLocation="http://ehcache.org/ehcache.xsd">

maxElementsInMemory="0"

eternal="true"

overflowToDisk="true"

diskPersistent="true"

memoryStoreEvictionPolicy="LRU">

xsi:noNamespaceSchemaLocation="http://ehcache.org/ehcache.xsd">

maxElementsInMemory="0"

eternal="true"

overflowToDisk="true"

diskPersistent="true"

memoryStoreEvictionPolicy="LRU">

maxElementsInMemory="0"

eternal="true"

overflowToDisk="true"

diskPersistent="true"

memoryStoreEvictionPolicy="LRU">

UserDetailsCacheConfig.java

@Slf4j

@Configuration

public class UserDetailsCacheConfig {

@Autowired

private CustomUserDetailsService customUserDehttp://tailsService;

@Bean

public UserCache userCache(){

try {

EhCacheBasedUserCache userCache = new EhCacheBasedUserCache();

val cacheManager = CacheManager.getInstance();

val cache = cacheManager.getCache("userCache");

userCache.setCache(cache);

return userCache;

} catch (Exception e) {

e.printStackTrace();

log.error(e.getMessage());

}

return null;

}

@Bean

public UserDetailsService userDetailsService(){

Constructor ctor = null;

try {

ctor = CachingUserDetailsService.class.getDeclaredConstructor(UserDetailsService.class);

} catch (NoSuchMethodException e) {

e.printStackTrace();

}

Assert.notNull(ctor, "CachingUserDetailsService constructor is null");

ctor.setAccessible(true);

CachingUserDetailsService cachingUserDetailsService = BeanUtils.instantiateClass(ctor, customUserDetailsService);

cachingUserDetailsService.setUserCache(userCache());

return cachingUserDetailsService;

}

}

使用

@Autowired

private UserDetailsService userDetailsService;

欢迎关注我的oauthserver项目，仅仅需要运行建表sql，修改数据库的连接配置，即可得到一个Spring Boot Oauth2 Server微服务。项目地址https://github.com/jeesun/oauthserver

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