1.注解式授权

@RequiresAuthentication 要求当前 Subject 已经在当前的 session 中被验证通过才能被访问或调用。

例子：

@RequiresAuthentication
public void updateAccount(Account userAccount) {
    //this method will only be invoked by a
    //Subject that is guaranteed authenticated
    ...
}

等价于java代码

public void updateAccount(Account userAccount) {
    if (!SecurityUtils.getSubject().isAuthenticated()) {
        throw new AuthorizationException(...);
    }

    //Subject is guaranteed authenticated here
    ...
}

@RequiresGuest 要求当前的 Subject 是一个"guest"，也就是说，他们必须是在之前的 session 中没有被验证或被记住才能被访问或调用。

例子

@RequiresGuest
public void signUp(User newUser) {
    //this method will only be invoked by a
    //Subject that is unknown/anonymous
    ...
}

等价于

public void signUp(User newUser) {
    Subject currentUser = SecurityUtils.getSubject();
    PrincipalCollection principals = currentUser.getPrincipals();
    if (principals != null && !principals.isEmpty()) {
        //known identity - not a guest:
        throw new AuthorizationException(...);
    }

    //Subject is guaranteed to be a 'guest' here
    ...
}

@RequiresPermissions("account:create") 要求当前的 Subject 被允许一个或多个权限，以便执行注解的方法。

例子：

@RequiresPermissions("account:create")
public void createAccount(Account account) {
    //this method will only be invoked by a Subject
    //that is permitted to create an account
    ...
}

等价于

public void createAccount(Account account) {
    Subject currentUser = SecurityUtils.getSubject();
    if (!subject.isPermitted("account:create")) {
        throw new AuthorizationException(...);
    }

    //Subject is guaranteed to be permitted here
    ...
}

@RequiresRoles("administrator") 要求当前的 Subject 拥有所有指定的角色。如果他们没有，则该方法将不会被执行，而且 AuthorizationException 异常将会被抛出。

例子：

@RequiresRoles("administrator")
public void deleteUser(User user) {
    //this method will only be invoked by an administrator
    ...
}

等价于java代码

public void deleteUser(User user) {
    Subject currentUser = SecurityUtils.getSubject();
    if (!subject.hasRole("administrator")) {
        throw new AuthorizationException(...);
    }

    //Subject is guaranteed to be an 'administrator' here
    ...
}

@RequiresUser 注解需要当前的 Subject 是一个应用程序用户才能被注解的类/实例/方法访问或调用。一个“应用程序用户”被定义为一个拥有已知身份，或在当前 session 中由于通过验证被确认，或者在之前 session 中的'RememberMe' 服务被记住

例子：

@RequiresUser
public void updateAccount(Account account) {
    //this method will only be invoked by a 'user'
    //i.e. a Subject with a known identity
    ...
}

等价于java代码

public void updateAccount(Account account) {
    Subject currentUser = SecurityUtils.getSubject();
    PrincipalCollection principals = currentUser.getPrincipals();
    if (principals == null || principals.isEmpty()) {
        //no identity - they're anonymous, not allowed:
        throw new AuthorizationException(...);
    }

    //Subject is guaranteed to have a known identity here
    ...
}

2.jsp授权标签

使用jsp的授权标签之前需要引入该标签的tag

<%@ taglib prefix="shiro" uri="http://shiro.apache.org/tags" %>

Guest 标签：用户没有身份验证时显示相应信息，即游客访问信息；

<shiro:guest>
    Hi there!  Please <a href="login.jsp">Login</a> or <a href="signup.jsp">Signup</a> today!
</shiro:guest>

User 标签：用户已经身份验证 / 记住我登录后显示相应的信息；

<shiro:user>
    Welcome back John!  Not John? Click <a href="login.jsp">here<a> to login.
</shiro:user>

Authenticated 标签：用户已经身份验证通过，即 Subject.login 登录成功，不是记住我登录的。仅当当前用户在其当前会话期间已成功通过身份验证时，才显示主体内容

<shiro:authenticated>
    <a href="updateAccount.jsp">Update your contact information</a>.
</shiro:authenticated>

notAuthenticated 标签：用户没有身份验证通过，即没有调用 Subject.login 进行登录，包括记住我自动登录的也属于未进行身份验证。

<shiro:notAuthenticated>
    Please <a href="login.jsp">login</a> in order to update your credit card information.
</shiro:notAuthenticated>

principal 标签显示用户身份信息，默认调用 Subject.getPrincipal() 获取，即 Primary Principal 。

Hello, <shiro:principal/>, how are you today?

等价于

Hello, <%= SecurityUtils.getSubject().getPrincipal().toString() %>, how are you today?

hasRole 标签如果当前 Subject 有角色将显示 body 体内容。

<shiro:hasRole name="administrator">
    <a href="admin.jsp">Administer the system</a>
</shiro:hasRole>

administrator是当前用户有的角色

lacksRole 标签如果当前 Subject 没有角色将显示 body 体内容。

<shiro:lacksRole name="administrator">
    Sorry, you are not allowed to administer the system.
</shiro:lacksRole>

hasAnyRoles 标签如果当前 Subject 有任意一个角色（或的关系）将显示 body 体内容。

<shiro:hasAnyRoles name="developer, project manager, administrator">
    You are either a developer, project manager, or administrator.
</shiro:lacksRole>

hasPermission 标签如果当前 Subject 有权限将显示 body 体内容。

<shiro:hasPermission name="user:create">
    <a href="createUser.jsp">Create a new User</a>
</shiro:hasPermission>

lacksPermission 标签如果当前 Subject 没有权限将显示 body 体内容

<shiro:lacksPermission name="user:delete">
    Sorry, you are not allowed to delete user accounts.
</shiro:hasPermission>

（四）shiro注解授权和jsp标签授权

1.注解式授权

2.jsp授权标签

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