<!-- https://mvnrepository.com/artifact/org.apache.shiro/shiro-spring -->
        <dependency>
            <groupId>org.apache.shiro</groupId>
            <artifactId>shiro-spring</artifactId>
            <version>1.7.1</version>
        </dependency>

@Configuration
public class ShiroConfig {
    //ShiroFilterFactoryBean
    @Bean
    public ShiroFilterFactoryBean getShiroFilterFactoryBean(@Autowired DefaultWebSecurityManager securityManager) {
        ShiroFilterFactoryBean filterFactoryBean = new ShiroFilterFactoryBean();
        filterFactoryBean.setSecurityManager(securityManager);
        Map<String, String> filterChainDefinitionMap = new LinkedHashMap<>();
        //攔截
        filterChainDefinitionMap.put("/user/add", "authc");
        filterChainDefinitionMap.put("/user/update", "authc");
        filterChainDefinitionMap.put("/user/*", "authc");
        filterChainDefinitionMap.put("/logout", "logout");//退出
        /*filterChainDefinitionMap.put("/*","authc");*/
        //授權
        filterChainDefinitionMap.put("/user/add","perms[user:add]");
        filterChainDefinitionMap.put("/user/update","perms[user:update]");

        //設置登錄的請求
        filterFactoryBean.setLoginUrl("/toLogin");
        //設置未授權頁面
        filterFactoryBean.setUnauthorizedUrl("/unauth");

        filterFactoryBean.setFilterChainDefinitionMap(filterChainDefinitionMap);
        return filterFactoryBean;
    }
    //DefaultWebSecurityManager
    @Bean
    public DefaultWebSecurityManager getDefaultWebSecurityManager(@Autowired UserRealm userRealm) {
        DefaultWebSecurityManager securityManager = new DefaultWebSecurityManager();
        securityManager.setRealm(userRealm);
        return securityManager;
    }
    //Realm
    @Bean
    public UserRealm userRealm() {
        return new UserRealm();
    }
}

public class UserRealm extends AuthorizingRealm {
    @Autowired
    UserService userService;
    @Override
    protected AuthorizationInfo doGetAuthorizationInfo(PrincipalCollection principalCollection) {
        SimpleAuthorizationInfo authorizationInfo = new SimpleAuthorizationInfo();
        //authorizationInfo.addStringPermission("user:add");
        Subject currentUser = SecurityUtils.getSubject();
        /**
         *  通過session取值
         */
        /*Session session = currentUser.getSession();
        String username = (String) session.getAttribute("username");
        System.out.println(username);
        User user = userService.getByUsername(username);
        authorizationInfo.addStringPermission(user.getPerm());
        System.out.println(user.getPerm());*/
        /**
         * 通過principal取值
         */
        String username = (String) currentUser.getPrincipal();
        System.out.println(username);
        User user = userService.getByUsername(username);
        System.out.println(user.getPerm());
        String[] perms = user.getPerm().split(",");
        ArrayList<String> permList = new ArrayList();
        for (String perm : perms) {
            permList.add(perm);
        }
        authorizationInfo.addStringPermissions(permList);
        System.out.println("執(zhí)行了======>授權");
        return authorizationInfo;
    }
    @Override
    protected AuthenticationInfo doGetAuthenticationInfo(AuthenticationToken authenticationToken) throws AuthenticationException {
        System.out.println("執(zhí)行了======>認證");
        UsernamePasswordToken token = (UsernamePasswordToken) authenticationToken;
        User user = userService.getByUsername(token.getUsername());
        if (user == null) {
            return null;
        }
        //密碼可以加密
        //密碼認證，shiro加密
        return new SimpleAuthenticationInfo(user.getUsername(), user.getPassword(),"");
    }
}	

@Controller
public class MyController {
    @RequestMapping("/toLogin")
    public String toLogin() {
        return "login";
    }
    @RequestMapping({"/","/index"})
    public String toIndex(Model model) {
        model.addAttribute("msg","Hello,Shiro");
        return "index";
    }
    @RequestMapping("/user/add")
    public String addUser() {
        return "user/add";
    }
    @RequestMapping("/user/update")
    public String updateUser() {
        return "user/update";
    }
    @PostMapping("/login")
    public String login(String username, String password, Model model) {
        UsernamePasswordToken token = new UsernamePasswordToken(username, password);
        Subject currentUser = SecurityUtils.getSubject();
            try {
                currentUser.login(token);
                Session session = currentUser.getSession();
                session.setAttribute("username", username);
                return "index";
            } catch (UnknownAccountException uae) {
                model.addAttribute("msg", token.getPrincipal() + "用戶名不匹配");
                return "login";
            } catch (IncorrectCredentialsException ice) {
                model.addAttribute("msg", token.getPrincipal() + "密碼錯誤");
                return "login";
            }
    }
    @ResponseBody
    @RequestMapping("/unauth")
    public String unAuth() {
        return "未經(jīng)授權";
    }
    @RequestMapping("/logout")
    public String logout() {
        return "/login";
    }
}

<!--thymeleaf shiro整合包-->
        <!-- https://mvnrepository.com/artifact/com.github.theborakompanioni/thymeleaf-extras-shiro -->
        <dependency>
            <groupId>com.github.theborakompanioni</groupId>
            <artifactId>thymeleaf-extras-shiro</artifactId>
            <version>2.0.0</version>
        </dependency>

<html lang="en" xmlns:th="http://www.thymeleaf.org"
      xmlns:shiro="http://www.pollix.at/thymeleaf/shiro">

<div shiro:notAuthenticated=""> <!--沒有認證不顯示-->
    <p><button><a th:href="@{/toLogin}">登錄</a></button></p>
</div>
<div shiro:authenticated=""><!--認證了顯示-->
    <p><button><a th:href="@{/logout}">退出</a></button></p>
</div>
<hr/>
<div shiro:hasPermission="user:update"><!--有user:update 權限顯示-->
    <a th:href="@{/user/add}">add</a>
</div>
<div shiro:hasPermission="user:add"><!--有user:add權限顯示-->
    <a th:href="@{/user/update}">update</a>
</div>