一、Shiro基础

1.1Shiro定义:

Apache Shiro™ 是一个功能强大且易于使用的 Java 安全框架，用于执行身份验证，授权、加密和会话管理。使用四郎易于理解的API，您可以快速轻松地保护任何应用程序 - 从最小的移动应用程序到最大的 Web 和企业应用程序。

1.2Shiro架构:

1.3快速上手:

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import org.apache.shiro.SecurityUtils;
import org.apache.shiro.authc.*;
import org.apache.shiro.config.IniSecurityManagerFactory;
import org.apache.shiro.mgt.SecurityManager;
import org.apache.shiro.session.Session;
import org.apache.shiro.subject.Subject;
import org.apache.shiro.util.Factory;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;


/**
 * Simple Quickstart application showing how to use Shiro's API.
 *
 * @since 0.9 RC2
 */
public class Quickstart {

    private static final transient Logger log = LoggerFactory.getLogger(Quickstart.class);


    public static void main(String[] args) {

        // The easiest way to create a Shiro SecurityManager with configured
        // realms, users, roles and permissions is to use the simple INI config.
        // We'll do that by using a factory that can ingest a .ini file and
        // return a SecurityManager instance:

        // Use the shiro.ini file at the root of the classpath
        // (file: and url: prefixes load from files and urls respectively):

        Factory<SecurityManager> factory = new IniSecurityManagerFactory("classpath:shiro.ini");
        SecurityManager securityManager = factory.getInstance();

        // for this simple example quickstart, make the SecurityManager
        // accessible as a JVM singleton.  Most applications wouldn't do this
        // and instead rely on their container configuration or web.xml for
        // webapps.  That is outside the scope of this simple quickstart, so
        // we'll just do the bare minimum so you can continue to get a feel
        // for things.
        SecurityUtils.setSecurityManager(securityManager);

        // Now that a simple Shiro environment is set up, let's see what you can do:

        // get the currently executing user:
        //获得当前的用户对象
        Subject currentUser = SecurityUtils.getSubject();

        // Do some stuff with a Session (no need for a web or EJB container!!!)
        //通过当前的用户拿到Session
        Session session = currentUser.getSession();
        session.setAttribute("someKey", "aValue");
        String value = (String) session.getAttribute("someKey");
        if (value.equals("aValue")) {
            log.info("Retrieved the correct value! [" + value + "]");
        }

        // let's login the current user so we can check against roles and permissions:
        //判断当前的用户是否被认证
        if (!currentUser.isAuthenticated()) {
            //Token:令牌,没有获取,随机
            UsernamePasswordToken token = new UsernamePasswordToken("lonestarr", "vespa");
            token.setRememberMe(true);  //设置记住我
            try {
                currentUser.login(token);  //执行登录操作
            } catch (UnknownAccountException uae) {
                log.info("There is no user with username of " + token.getPrincipal());
            } catch (IncorrectCredentialsException ice) {
                log.info("Password for account " + token.getPrincipal() + " was incorrect!");
            } catch (LockedAccountException lae) {
                log.info("The account for username " + token.getPrincipal() + " is locked.  " +
                        "Please contact your administrator to unlock it.");
            }
            // ... catch more exceptions here (maybe custom ones specific to your application?
            catch (AuthenticationException ae) {
                //unexpected condition?  error?
            }
        }

        //say who they are:
        //print their identifying principal (in this case, a username):
        //存取信息的
        log.info("User [" + currentUser.getPrincipal() + "] logged in successfully.");

        //test a role:
        if (currentUser.hasRole("schwartz")) {
            log.info("May the Schwartz be with you!");
        } else {
            log.info("Hello, mere mortal.");
        }

        //test a typed permission (not instance-level)
        //粗力度权限检查
        if (currentUser.isPermitted("lightsaber:wield")) {
            log.info("You may use a lightsaber ring.  Use it wisely.");
        } else {
            log.info("Sorry, lightsaber rings are for schwartz masters only.");
        }

        //a (very powerful) Instance Level permission:
        //细力度权限检查
        if (currentUser.isPermitted("winnebago:drive:eagle5")) {
            log.info("You are permitted to 'drive' the winnebago with license plate (id) 'eagle5'.  " +
                    "Here are the keys - have fun!");
        } else {
            log.info("Sorry, you aren't allowed to drive the 'eagle5' winnebago!");
        }

        //all done - log out!
        //注销
        currentUser.logout();

        //结束
        System.exit(0);
    }
}

下面我给出几个shiro的核心代码

1.获取当前的用户

Subject currentUser = SecurityUtils.getSubject();

2.shiro拥有自己独立的session

Session session = currentUser.getSession();

3.判断当前用户是否被认证

currentUser.isAuthenticated()

4.获得当前用户的认证

currentUser.getPrincipal()

5.判断当前用户是否有对应的角色

currentUser.hasRole("schwartz")

6.获得当前用户的权限,根据参数的不同产生不同的效果

currentUser.isPermitted()

7.注销

currentUser.logout();

8.记住我功能

token.setRememberMe(true);

二、Springboot整合Shiro

2.1导入spring整合shiro的依赖

<!--shiro整合spring的包-->
        <dependency>
            <groupId>org.apache.shiro</groupId>
            <artifactId>shiro-spring</artifactId>
            <version>1.7.0</version>
        </dependency>

2.2两个配置类

第一个为ShiroConfig类，需要注入三个bean，注意，这三个bean逻辑上有严格的层级关系

package com.example.springbshiro.demos.config;

import org.apache.shiro.spring.web.ShiroFilterFactoryBean;
import org.apache.shiro.web.mgt.DefaultWebSecurityManager;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import java.util.LinkedHashMap;
import java.util.Map;

@Configuration
public class ShiroConfig {
    //ShiroFilterFactoryBean
    @Bean
    public ShiroFilterFactoryBean getShiroFilterFactoryBean(@Qualifier("securityManager") DefaultWebSecurityManager defaultWebSecurityManager){
        ShiroFilterFactoryBean bean = new ShiroFilterFactoryBean();
        //设置安全管理器
        bean.setSecurityManager(defaultWebSecurityManager);
        //添加shiro 的内置过滤器
        /*
        anon:无需认证就可以访问
        authc:必须认证才能访问
        user:必须拥有记住我功能才能用
        perms:拥有对某个资源的权限才能访问
        role:拥有某个角色权限才能访问
         */
        //拦截
        Map<String,String> filternMap = new LinkedHashMap<>();

        //授权,正常情况下未授权会跳转的未授权页面
        filternMap.put("/user/add","perms[user:add]");
        filternMap.put("/user/update","perms[user:update]");

        //设置访问权限
        filternMap.put("/user/add","authc");
        filternMap.put("/user/update","authc");
        //支持通配符
        filternMap.put("/user/*","authc");

        bean.setFilterChainDefinitionMap(filternMap);

        //如果没有权限，设置登录请求
        bean.setLoginUrl("/toLogin");
        //未授权页面
        bean.setUnauthorizedUrl("/noauth");

        return bean;
    }

    //DafaulWebSecurityManager
    @Bean(name="securityManager")
    public DefaultWebSecurityManager getDefaultWebSecurityManager(@Qualifier("userRealm") UserRealm userRealm) {
        DefaultWebSecurityManager securityManager = new DefaultWebSecurityManager();
        //关联UserRealm
        securityManager.setRealm(userRealm);
        return securityManager;
    }

    //创建realm对象,需要自定义类
    @Bean(name = "userRealm")  //不写name的话，默认是方法名
    public UserRealm userRealm(){
        return new UserRealm();
    }

}

第二个配置类是实现UserRealm，通过给UserRealm进行授权和认证，来限制用户的访问权限

UserRealm继承于AuthorizingRealm

package com.example.springbshiro.demos.config;


import org.apache.shiro.SecurityUtils;
import org.apache.shiro.authc.*;
import org.apache.shiro.authz.AuthorizationInfo;
import org.apache.shiro.authz.SimpleAuthorizationInfo;
import org.apache.shiro.realm.AuthorizingRealm;
import org.apache.shiro.subject.PrincipalCollection;
import org.apache.shiro.subject.Subject;

//自定义的UserRealm
public class UserRealm extends AuthorizingRealm {
    //授权
    @Override
    protected AuthorizationInfo doGetAuthorizationInfo(PrincipalCollection principalCollection) {
//        System.out.println("执行了授权");
        SimpleAuthorizationInfo info = new SimpleAuthorizationInfo();

        //授权对应的方法
        info.addStringPermission("user:add");

        //拿到当前登录的对象
        Subject subject = SecurityUtils.getSubject();
//        User user = (User)subject.getPrincipal();  //拿到User对象
        //设置用户权限，设置用户数据库中的权限
        //info.addStringPermission(user.getPerms());

        return info;
    }

    //认证
    @Override
    protected AuthenticationInfo doGetAuthenticationInfo(AuthenticationToken token) throws AuthenticationException {
//        System.out.println("执行了认证");
        //用户名，密码，数据库中取
        String name = "root";
        String password = "123456";

        //连接真实数据库的操作
        //User user = userService.queryUserByName(userToken.getUsername())
        //if(user == null){  这个人不存在
        // return null; }

        UsernamePasswordToken userToken = (UsernamePasswordToken) token;

        if(!userToken.getUsername().equals(name)){
            return null;  //抛出异常(UnknownAccountException  返回空就是返回这个错误)
        }

        //密码认证，shiro来做，(已加密)
        return new SimpleAuthenticationInfo("",password,"");

    }
}