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
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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;
}
}
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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
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<?xml version="1.0" encoding="utf-8"?>
<ehcache xmlns:xsi="http://www.w3.org/2001/xmlschema-instance"
xsi:nonamespaceschemalocation="http://ehcache.org/ehcache.xsd">
<!-- 磁盘缓存位置 -->
<diskstore path="java.io.tmpdir" />
<cache name="usercache"
maxelementsinmemory="0"
eternal="true"
overflowtodisk="true"
diskpersistent="true"
memorystoreevictionpolicy="lru">
</cache>
</ehcache>
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userdetailscacheconfig.java
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@slf4j
@configuration
public class userdetailscacheconfig {
@autowired
private customuserdetailsservice customuserdetailsservice;
@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<cachinguserdetailsservice> 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;
}
}
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使用
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@autowired
private userdetailsservice userdetailsservice;
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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
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持快网idc。
原文链接：http://www.cnblogs.com/rainmer/p/9417108.html
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