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Shiro的认证过程
这篇文章主要讲解了“Shiro的认证过程”，文中的讲解内容简单清晰，易于学习与理解，下面请大家跟着小编的思路慢慢深入，一起来研究和学习“Shiro的认证过程”吧！
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Shiro的架构了解之后，走一下debug，跟一下认证的流程。使用Realm来认证用户名密码。
使用realm访问数据库里的数据
获取当前的subject
校验subject是否已经登录
若没有认证则封装用户名密码
1.0创建表单页面 存储提交
2.0请求提交到mvc的handler
3.0获取用户名密码
4.0执行登录：调用subject的login(token)
5.0自定义realm，从数据库获取对应记录，返回给shiro
Realm实现类AuthenticatingRealm
protected abstract AuthenticationInfo doGetAuthenticationInfo(AuthenticationToken var1) throws AuthenticationException;
实现该方法
6.0Shiro完成对密码的比对
currentUser.login(token);login方法的实现void login(AuthenticationToken var1) throws AuthenticationException;
向下走，看下实现
public void login(AuthenticationToken token) throws AuthenticationException {this.clearRunAsIdentitiesInternal();Subject subject = this.securityManager.login(this, token);String host = null;PrincipalCollection principals;if (subject instanceof DelegatingSubject) {DelegatingSubject delegating = (DelegatingSubject)subject;principals = delegating.principals;host = delegating.host;} else {principals = subject.getPrincipals();}if (principals != null && !principals.isEmpty()) {this.principals = principals;this.authenticated = true;if (token instanceof HostAuthenticationToken) {host = ((HostAuthenticationToken)token).getHost();}if (host != null) {this.host = host;}Session session = subject.getSession(false);if (session != null) {this.session = this.decorate(session);} else {this.session = null;}} else {String msg = "Principals returned from securityManager.login( token ) returned a null or empty value. This value must be non null and populated with one or more elements.";throw new IllegalStateException(msg);}}
info = this.authenticate(token);public AuthenticationInfo authenticate(AuthenticationToken token) throws AuthenticationException {return this.authenticator.authenticate(token);}
最终调用的
==============public final AuthenticationInfo getAuthenticationInfo(AuthenticationToken token) throws AuthenticationException {AuthenticationInfo info = this.getCachedAuthenticationInfo(token);if (info == null) {info = this.doGetAuthenticationInfo(token);log.debug("Looked up AuthenticationInfo [{}] from doGetAuthenticationInfo", info);if (token != null && info != null) {this.cacheAuthenticationInfoIfPossible(token, info);}} else {log.debug("Using cached authentication info [{}] to perform credentials matching.", info);}if (info != null) {this.assertCredentialsMatch(token, info);} else {log.debug("No AuthenticationInfo found for submitted AuthenticationToken [{}]. Returning null.", token);}return info;}
int i = token.hashCode();此时的hashcode与 info = this.doGetAuthenticationInfo(token);doGetAuthenticationInfo获取的token是一致的
但是会由于缓存 不能达到登录后在返回同样验证的效果
Shiro如何比对密码
token中保存了从数据库获取的密码 以及从前台传过来的密码
然后进行比对
密码的比对
public boolean doCredentialsMatch(AuthenticationToken token, AuthenticationInfo info) { Object tokenCredentials = getCredentials(token); Object accountCredentials = getCredentials(info); return equals(tokenCredentials, accountCredentials);}public void setCredentialsMatcher(CredentialsMatcher credentialsMatcher) { this.credentialsMatcher = credentialsMatcher;} 
认证流程走完，能够明确Shiro还是需要数据库中的数据来跟前台数据进行比对密码，如果不能跳转页面或者走到方法，需要在applicationcontext.xml中配置URL
感谢各位的阅读，以上就是“Shiro的认证过程”的内容了，经过本文的学习后，相信大家对Shiro的认证过程这一问题有了更深刻的体会，具体使用情况还需要大家实践验证。这里是创新互联，小编将为大家推送更多相关知识点的文章，欢迎关注！
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