<dependency>
      <groupId>net.sf.ehcache</groupId>
      <artifactId>ehcache</artifactId>
      <version>2.10.4</version>
    </dependency>
    <!-- shiro spring. -->
    <dependency>
      <groupId>org.apache.shiro</groupId>
      <artifactId>shiro-core</artifactId>
      <version>1.2.2</version>
    </dependency>
    <dependency>
      <groupId>org.apache.shiro</groupId>
      <artifactId>shiro-spring</artifactId>
      <version>1.2.2</version>
    </dependency>
    <!-- shiro ehcache -->
    <dependency>
      <groupId>org.apache.shiro</groupId>
      <artifactId>shiro-ehcache</artifactId>
      <version>1.2.2</version>
    </dependency>

@Configuration
public class ShiroConfig {

  @Bean 
  public ShiroFilterFactoryBean shirFilter(DefaultWebSecurityManager securityManager) { 

    ShiroFilterFactoryBean shiroFilter = new ShiroFilterFactoryBean(); 
    // 必須設(shè)置 SecurityManager 
    shiroFilter.setSecurityManager(securityManager); 
    // 攔截器 
    Map<String, String> filterChainDefinitionMap = new LinkedHashMap<String, String>(); 
    // 設(shè)置login URL 
    shiroFilter.setLoginUrl("/login"); 
    // 登錄成功后要跳轉(zhuǎn)的鏈接 
    shiroFilter.setSuccessUrl("/main"); 
    filterChainDefinitionMap.put("/webjars/**", "anon");
    filterChainDefinitionMap.put("/druid/**", "anon");
    //靜態(tài)資源的處理
    filterChainDefinitionMap.put("/js/**", "anon");
    filterChainDefinitionMap.put("/css/**", "anon");
    filterChainDefinitionMap.put("/asserts/**", "anon");
    filterChainDefinitionMap.put("/fonts/**", "anon");
    filterChainDefinitionMap.put("/images/**", "anon");

    // 退出系統(tǒng)的過濾器 
    filterChainDefinitionMap.put("/logout", "logout");
    filterChainDefinitionMap.put("/login", "anon"); 

    filterChainDefinitionMap.put("/kaptcha", "anon");

    filterChainDefinitionMap.put("/**", "authc"); 
    shiroFilter.setFilterChainDefinitionMap(filterChainDefinitionMap); 
    return shiroFilter; 
  } 

  @Bean 
  public HashedCredentialsMatcher hashedCredentialsMatcher() { 
    HashedCredentialsMatcher hashedCredentialsMatcher = new HashedCredentialsMatcher(); 
    hashedCredentialsMatcher.setHashAlgorithmName("MD5");
    hashedCredentialsMatcher.setHashIterations(1024);
    return hashedCredentialsMatcher; 
  } 

  @Bean
  public ShiroRealm shiroRealm(HashedCredentialsMatcher hashedCredentialsMatcher) {
    ShiroRealm shiroRealm = new ShiroRealm();
    shiroRealm.setCredentialsMatcher(hashedCredentialsMatcher);
    return shiroRealm;
  }
  //shiro使用緩存ehcachae
  @Bean
  public EhCacheManager ehCacheManager() {
    EhCacheManager ehCacheManager = new EhCacheManager();
    ehCacheManager.setCacheManagerConfigFile("classpath:ehcache.xml");
    return ehCacheManager;

  }

  @Bean("sessionManager")
  public SessionManager sessionManager(){
    DefaultWebSessionManager sessionManager = new DefaultWebSessionManager();
    sessionManager.setSessionValidationSchedulerEnabled(true);
    sessionManager.setSessionIdCookieEnabled(true);
    return sessionManager;
  }

  @Bean("securityManager")
  public DefaultWebSecurityManager securityManager(ShiroRealm shiroRealm, SessionManager sessionManager) {
    DefaultWebSecurityManager securityManager = new DefaultWebSecurityManager();
    securityManager.setRealm(shiroRealm);
    securityManager.setSessionManager(sessionManager);

    return securityManager;
  }

  @Bean("lifecycleBeanPostProcessor")
  public LifecycleBeanPostProcessor lifecycleBeanPostProcessor() {
    return new LifecycleBeanPostProcessor();
  }

  @Bean
  public DefaultAdvisorAutoProxyCreator defaultAdvisorAutoProxyCreator() {
    DefaultAdvisorAutoProxyCreator proxyCreator = new DefaultAdvisorAutoProxyCreator();
    proxyCreator.setProxyTargetClass(true);
    return proxyCreator;
  }

  @Bean
  public AuthorizationAttributeSourceAdvisor authorizationAttributeSourceAdvisor(SecurityManager securityManager) {
    AuthorizationAttributeSourceAdvisor advisor = new AuthorizationAttributeSourceAdvisor();
    advisor.setSecurityManager(securityManager);
    return advisor;
  }
}

public class ShiroRealm extends AuthorizingRealm {
  @Autowired
  private UserService userService;

  @Override
  protected AuthenticationInfo doGetAuthenticationInfo(AuthenticationToken token) throws AuthenticationException {
    UsernamePasswordToken upToken = (UsernamePasswordToken) token;
    // 取出表單用戶名
    String username = upToken.getUsername();
    // 查詢是否有該用戶
    if (userService.getByName(username) == null) {
      throw new UnknownAccountException("用戶不存在!");
    }
    // 靠用戶名從數(shù)據(jù)庫查詢該用戶的全部信息
    User user = userService.getByName(username);
    // 傳入:用戶名,加密后的密碼,鹽值,該realm的名字，加密算法和加密次數(shù)在已經(jīng)在配置文件中指定
    SimpleAuthenticationInfo info = new SimpleAuthenticationInfo(username, user.getPassword(),
        ByteSource.Util.bytes(username), getName());
    return info;
  }

  @Override
  protected AuthorizationInfo doGetAuthorizationInfo(PrincipalCollection principals) {
    // 1. 從 PrincipalCollection 中來獲取登錄用戶的信息
    Object principal = principals.getPrimaryPrincipal();
    // 2. 利用登錄的用戶的信息來..當前用戶的角色或權(quán)限(可能需要查詢數(shù)據(jù)庫)
    Set<String> roles = new HashSet<String>();
    roles.add("user");
    if ("admin".equals(principal)) {
      roles.add("admin");
    }
    // 3. 創(chuàng)建 SimpleAuthorizationInfo, 并設(shè)置其 reles 屬性
    SimpleAuthorizationInfo info = new SimpleAuthorizationInfo(roles);
    // 4. 返回 SimpleAuthorizationInfo 對象.
    return info;
  }
}

  public static void main(String[] args) {

    Object result = new SimpleHash("MD5","123456",ByteSource.Util.bytes("admin"),1024);
    System.out.println(result);
  }

@Controller
public class LoginController {
  // 處理登錄邏輯
  @PostMapping("/login")
  public String login(String username, String password, String kaptcha, HttpSession session,
      Map<String, Object> map) {
    Subject currentUser = SecurityUtils.getSubject();
    if (!currentUser.isAuthenticated()) {
      // 把用戶名和密碼封裝為 UsernamePasswordToken 對象
      UsernamePasswordToken token = new UsernamePasswordToken(username, password);
      // 設(shè)置為rememberme
      token.setRememberMe(true);
      try {
        // 執(zhí)行登錄.
        currentUser.login(token);
      }
      // 所有認證時異常的父類
      catch (AuthenticationException ae) {
        map.put("password", "輸入的用戶名或密碼錯誤");
        log.info("登錄失敗: " + ae.getMessage());
        return "login";
      }
    }
    if (!session.getAttribute("code").equals(kaptcha)) {
      map.put("kaptcha", "輸入的驗證碼錯誤");
      return "login";
    }

    session.setAttribute("loginUser", "user");
    return "main";
  }
}