What

Apache Shiro旨在成为最全面的，但也是最容易使用的Java安全框架。

文档

没有比官网更好的了 https://shiro.apache.org/get-started.html

简要分析

了解术语

Authentication：认证
Authorization：授权（访问控制）
其他：https://shiro.apache.org/terminology.html

架构

Shiro的架构有三个主要概念：Subject，SecurityManager和Realms

其他：https://shiro.apache.org/architecture.html

快速启动

获取当前用户（这里叫主题subject，代之用户，程序，上下文等，不叫user主要是防止shiro不跟其他框架重名）

Subject currentUser = SecurityUtils.getSubject();

获得会话session

Session session = currentUser.getSession();
session.setAttribute( "someKey", "aValue" );

登陆认证

if ( !currentUser.isAuthenticated() ) {
    //collect user principals and credentials in a gui specific manner
    //such as username/password html form, X509 certificate, OpenID, etc.
    //We'll use the username/password example here since it is the most common.
    //(do you know what movie this is from? ;)
    UsernamePasswordToken token = new UsernamePasswordToken("lonestarr", "vespa");
    //this is all you have to do to support 'remember me' (no config - built in!):
    token.setRememberMe(true);
    currentUser.login(token);
}
//或者捕获异常
try {
    currentUser.login( token );
    //if no exception, that's it, we're done!
} catch ( UnknownAccountException uae ) {
    //username wasn't in the system, show them an error message?
} catch ( IncorrectCredentialsException ice ) {
    //password didn't match, try again?
} catch ( LockedAccountException lae ) {
    //account for that username is locked - can't login.  Show them a message?
}
    ... more types exceptions to check if you want ...
} catch ( AuthenticationException ae ) {
    //unexpected condition - error?
}

获得当前用户主体
currentUser.getPrincipal()

//是否有权限
if ( currentUser.hasRole( "schwartz" ) ) {
    log.info("May the Schwartz be with you!" );
} else {
    log.info( "Hello, mere mortal." );
}

//是否有权限
if ( currentUser.isPermitted( "lightsaber:weild" ) ) {
    log.info("You may use a lightsaber ring.  Use it wisely.");
} else {
    log.info("Sorry, lightsaber rings are for schwartz masters only.");
}

// 登出

currentUser.logout(); //removes all identifying information and invalidates their session too.