<dependency>
   <groupId>org.apache.shiro</groupId>
   <artifactId>shiro-spring</artifactId>
   <version>1.3.2</version>
</dependency>

import User;
import UserService;
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.springframework.beans.factory.annotation.Autowired; 
import java.util.ArrayList;
import java.util.List;
 
public class ShiroRealm extends AuthorizingRealm {
    //自己編寫的service，注入，執(zhí)行數(shù)據(jù)庫查詢方法用
    @Autowired
    private UserService userService;
    //認證.登錄
    @Override
    protected AuthenticationInfo doGetAuthenticationInfo(AuthenticationToken token) throws AuthenticationException {
        UsernamePasswordToken utoken=(UsernamePasswordToken) token;//獲取用戶輸入的token
        String username = utoken.getUsername();
        //這個User對象為自定義的JavaBean，使用userService從數(shù)據(jù)庫中得到User對象(包含用戶名、密碼、權(quán)限3個字段)
        User user = userService.findUserByUserName(username);
        return new SimpleAuthenticationInfo(user, user.getPassword(),this.getClass().getName());//放入shiro.調(diào)用CredentialsMatcher檢驗密碼
    }
    //授權(quán)
    @Override
    protected AuthorizationInfo doGetAuthorizationInfo(PrincipalCollection principal) {
        User user=(User) principal.fromRealm(this.getClass().getName()).iterator().next();//獲取session中的用戶
        List<String> permissions=new ArrayList<>();
        //使用自定義的user對象獲得權(quán)限字段，string類型，裝入集合
        permissions.add(user.getRole());
 
        SimpleAuthorizationInfo info=new SimpleAuthorizationInfo();
        info.addStringPermissions(permissions);//將權(quán)限放入shiro中.(我的代碼中其實沒有用到權(quán)限相關)
        return info;
    }
}

import java.util.LinkedHashMap;
import java.util.Map; 
import org.apache.shiro.mgt.SecurityManager;
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 javax.servlet.Filter;
 
@Configuration
public class ShiroConfiguration { 
    @Bean
    public ShiroFilterFactoryBean shirFilter(SecurityManager securityManager){
        ShiroFilterFactoryBean shiroFilterFactoryBean  = new ShiroFilterFactoryBean();
        // 必須設置 SecurityManager
        shiroFilterFactoryBean.setSecurityManager(securityManager);
 
        /*重要，設置自定義攔截器，當訪問某些自定義url時，使用這個filter進行驗證*/
        Map<String, Filter> filters = new LinkedHashMap<String, Filter>();
        //如果map里面key值為authc,表示所有名為authc的過濾條件使用這個自定義的filter
        //map里面key值為myFilter,表示所有名為myFilter的過濾條件使用這個自定義的filter，具體見下方
        filters.put("myFilter", new MyFilter());
        shiroFilterFactoryBean.setFilters(filters);
        /*---------------------------------------------------*/
 
        //攔截器
        Map<String,String> filterChainDefinitionMap = new LinkedHashMap<String,String>();
        //配置退出過濾器,其中的具體的退出代碼Shiro已經(jīng)替我們實現(xiàn)了
        filterChainDefinitionMap.put("/logout", "logout");
        //　　anon:所有url都都可以匿名訪問;
        //　　authc: 需要認證才能進行訪問;
        //　　user:配置記住我或認證通過可以訪問；
        //放開靜態(tài)資源的過濾
        filterChainDefinitionMap.put("/css/**", "anon");
        filterChainDefinitionMap.put("/js/**", "anon");
        filterChainDefinitionMap.put("/img/**", "anon");
        //放開登錄url的過濾
        filterChainDefinitionMap.put("/loginController", "anon");
        ///
        //對于指定的url，使用自定義filter進行驗證
        filterChainDefinitionMap.put("/targetUrl", "myFilter");
        //可以配置多個filter，用逗號分隔，按順序過濾，下方表示先通過自定義filter的驗證，再通過shiro默認過濾器的驗證
        //filterChainDefinitionMap.put("/targetUrl", "myFilter,authc");
        ///
        //過濾鏈定義，從上向下順序執(zhí)行，一般將 /**放在最為下邊
        //url從上向下匹配，當條件匹配成功時，就會進入指定filter并return(不會判斷后續(xù)的條件)，因此這句需要在最下邊
        filterChainDefinitionMap.put("/**", "authc");
 
        //如果不設置默認會自動尋找Web工程根目錄下的"/login.jsp"頁面
        shiroFilterFactoryBean.setLoginUrl("/login");
        // 登錄成功后要跳轉(zhuǎn)的鏈接
        shiroFilterFactoryBean.setSuccessUrl("/loginSuccess");
        // 未授權(quán)界面
        shiroFilterFactoryBean.setUnauthorizedUrl("/403"); 
        shiroFilterFactoryBean.setFilterChainDefinitionMap(filterChainDefinitionMap); 
        return shiroFilterFactoryBean;
    }
 
    @Bean
    public SecurityManager securityManager(){
        DefaultWebSecurityManager securityManager =  new DefaultWebSecurityManager();
        return securityManager;
    }
    //配置核心安全事務管理器
    @Bean(name="securityManager")
    public SecurityManager securityManager(@Qualifier("shiroRealm") ShiroRealm shiroRealm) {
        DefaultWebSecurityManager manager=new DefaultWebSecurityManager();
        manager.setRealm(shiroRealm);
        return manager;
    }
    //配置自定義的權(quán)限登錄器
    @Bean(name="shiroRealm")
    public ShiroRealm shiroRealm(@Qualifier("credentialsMatcher") CredentialsMatcher matcher) {
        ShiroRealm shiroRealm=new ShiroRealm();
        shiroRealm.setCredentialsMatcher(matcher);
        return shiroRealm;
    }
    //配置自定義的密碼比較器
    @Bean(name="credentialsMatcher")
    public CredentialsMatcher credentialsMatcher() {
        return new CredentialsMatcher();
    }
}

import org.apache.commons.lang.StringUtils;
import org.apache.shiro.SecurityUtils;
import org.apache.shiro.authc.UsernamePasswordToken;
import org.apache.shiro.subject.Subject;
import org.apache.shiro.web.filter.AccessControlFilter;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory; 
import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import java.util.Enumeration;
import java.util.Properties;
import java.util.Set; 
public class MyFilter extends AccessControlFilter {
    private static Logger log = LoggerFactory.getLogger(MyFilter.class);
 
    //判斷是否攔截，false為攔截，true為允許
    @Override
    public boolean isAccessAllowed(ServletRequest req, ServletResponse resp, Object object) throws Exception {
        Subject subject = getSubject(req,resp);
        String url = getPathWithinApplication(req);
        log.info("當前用戶正在訪問的url為 " + url);
        log.info("subject.isPermitted(url);"+subject.isPermitted(url));
        //可自行根據(jù)需要判斷是否攔截，可以獲得subject判斷用戶權(quán)限，也可以使用req獲得請求頭請求體信息
        //return true;
        return false;        
    }
 
    //上面的方法返回false后(被攔截)，會進入這個方法；這個方法返回false表示處理完畢(不放行)；返回true表示需要繼續(xù)處理(放行)
    @Override
    public boolean onAccessDenied(ServletRequest request, ServletResponse response) throws Exception {     
        //從req中獲得的值，也可以自己使用其它判斷是否放行的方法
        String username = request.getParameter("name");
        String password = request.getParameter("password");
        //創(chuàng)建token對象
        UsernamePasswordToken usernamePasswordToken=new UsernamePasswordToken(username,password);
        Subject subject = SecurityUtils.getSubject();
        try {
            //使用subject對象的login方法驗證該token能否登錄(使用方法2中的shiroRealm.java中的方法驗證)
            subject.login(usernamePasswordToken);
        } catch (Exception e) {
            //log.info("登陸失敗");
            //log.info(e.getMessage());
            return false;
        }
        //log.info("登陸成功");
        return true;
    }
}

import org.apache.shiro.authc.AuthenticationInfo;
import org.apache.shiro.authc.AuthenticationToken;
import org.apache.shiro.authc.UsernamePasswordToken;
import org.apache.shiro.authc.credential.SimpleCredentialsMatcher; 
public class CredentialsMatcher extends SimpleCredentialsMatcher {
 
    @Override
    public boolean doCredentialsMatch(AuthenticationToken token, AuthenticationInfo info) {
        UsernamePasswordToken utoken=(UsernamePasswordToken) token;
        //獲得用戶輸入的密碼:(可以采用加鹽(salt)的方式去檢驗)
        String inPassword = new String(utoken.getPassword());
        //獲得數(shù)據(jù)庫中的密碼
        String dbPassword=(String) info.getCredentials();
        //進行密碼的比對
        return this.equals(inPassword, dbPassword);
    }
}

import User;
import org.apache.shiro.SecurityUtils;
import org.apache.shiro.authc.UsernamePasswordToken;
import org.apache.shiro.subject.Subject;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping; 
import javax.servlet.http.HttpSession;
 
@Controller
public class ShiroController {
    @RequestMapping("/")
    public String loginPage() {
        return "login";
    }
    @RequestMapping("/login")
    public String login() {
        return "login";
    }
    @RequestMapping("/loginController")
    public String loginUser(String username,String password,HttpSession session) {
        UsernamePasswordToken usernamePasswordToken=new UsernamePasswordToken(username,password);
        Subject subject = SecurityUtils.getSubject();
        try {
            subject.login(usernamePasswordToken);   //完成登錄
            //自定義的JavaBean，用于保存用戶名、密碼、權(quán)限3個字段
            User user=(User) subject.getPrincipal();
            //可選，可放入session，以備后續(xù)使用
            session.setAttribute("user", user);
            //跳轉(zhuǎn)到登錄成功頁(controller)
            return "forward:/loginSuccess";
        } catch(Exception e) {
            //登錄失敗，跳轉(zhuǎn)回登錄頁(html)
            return "login";
        } 
    }
    @RequestMapping("/logOut")
    public String logOut(HttpSession session) {
        Subject subject = SecurityUtils.getSubject();
        subject.logout();
        //session.removeAttribute("user");
        return "login";
    }
}