springboot shiro自定义filter

<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 {
    //自己编写的service，注入，执行数据库查询方法用
    @Autowired
    private UserService userService;
    //认证.登录
    @Override
    protected AuthenticationInfo doGetAuthenticationInfo(AuthenticationToken token) throws AuthenticationException {
        UsernamePasswordToken utoken=(UsernamePasswordToken) token;//获取用户输入的token
        String username = utoken.getUsername();
        //这个User对象为自定义的JavaBean，使用userService从数据库中得到User对象(包含用户名、密码、权限3个字段)
        User user = userService.findUserByUserName(username);
        return new SimpleAuthenticationInfo(user, user.getPassword(),this.getClass().getName());//放入shiro.调用CredentialsMatcher检验密码
    }
    //授权
    @Override
    protected AuthorizationInfo doGetAuthorizationInfo(PrincipalCollection principal) {
        User user=(User) principal.fromRealm(this.getClass().getName()).iterator().next();//获取session中的用户
        List<String> permissions=new ArrayList<>();
        //使用自定义的user对象获得权限字段，string类型，装入集合
        permissions.add(user.getRole());
 
        SimpleAuthorizationInfo info=new SimpleAuthorizationInfo();
        info.addStringPermissions(permissions);//将权限放入shiro中.(我的代码中其实没有用到权限相关)
        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();
        // 必须设置 SecurityManager
        shiroFilterFactoryBean.setSecurityManager(securityManager);
 
        /*重要，设置自定义拦截器，当访问某些自定义url时，使用这个filter进行验证*/
        Map<String, Filter> filters = new LinkedHashMap<String, Filter>();
        //如果map里面key值为authc,表示所有名为authc的过滤条件使用这个自定义的filter
        //map里面key值为myFilter,表示所有名为myFilter的过滤条件使用这个自定义的filter，具体见下方
        filters.put("myFilter", new MyFilter());
        shiroFilterFactoryBean.setFilters(filters);
        /*---------------------------------------------------*/
 
        //拦截器
        Map<String,String> filterChainDefinitionMap = new LinkedHashMap<String,String>();
        //配置退出过滤器,其中的具体的退出代码Shiro已经替我们实现了
        filterChainDefinitionMap.put("/logout", "logout");
        //　　anon:所有url都都可以匿名访问;
        //　　authc: 需要认证才能进行访问;
        //　　user:配置记住我或认证通过可以访问；
        //放开静态资源的过滤
        filterChainDefinitionMap.put("/css/**", "anon");
        filterChainDefinitionMap.put("/js/**", "anon");
        filterChainDefinitionMap.put("/img/**", "anon");
        //放开登录url的过滤
        filterChainDefinitionMap.put("/loginController", "anon");
        ///
        //对于指定的url，使用自定义filter进行验证
        filterChainDefinitionMap.put("/targetUrl", "myFilter");
        //可以配置多个filter，用逗号分隔，按顺序过滤，下方表示先通过自定义filter的验证，再通过shiro默认过滤器的验证
        //filterChainDefinitionMap.put("/targetUrl", "myFilter,authc");
        ///
        //过滤链定义，从上向下顺序执行，一般将 /**放在最为下边
        //url从上向下匹配，当条件匹配成功时，就会进入指定filter并return(不会判断后续的条件)，因此这句需要在最下边
        filterChainDefinitionMap.put("/**", "authc");
 
        //如果不设置默认会自动寻找Web工程根目录下的"/login.jsp"页面
        shiroFilterFactoryBean.setLoginUrl("/login");
        // 登录成功后要跳转的链接
        shiroFilterFactoryBean.setSuccessUrl("/loginSuccess");
        // 未授权界面
        shiroFilterFactoryBean.setUnauthorizedUrl("/403"); 
        shiroFilterFactoryBean.setFilterChainDefinitionMap(filterChainDefinitionMap); 
        return shiroFilterFactoryBean;
    }
 
    @Bean
    public SecurityManager securityManager(){
        DefaultWebSecurityManager securityManager =  new DefaultWebSecurityManager();
        return securityManager;
    }
    //配置核心安全事务管理器
    @Bean(name="securityManager")
    public SecurityManager securityManager(@Qualifier("shiroRealm") ShiroRealm shiroRealm) {
        DefaultWebSecurityManager manager=new DefaultWebSecurityManager();
        manager.setRealm(shiroRealm);
        return manager;
    }
    //配置自定义的权限登录器
    @Bean(name="shiroRealm")
    public ShiroRealm shiroRealm(@Qualifier("credentialsMatcher") CredentialsMatcher matcher) {
        ShiroRealm shiroRealm=new ShiroRealm();
        shiroRealm.setCredentialsMatcher(matcher);
        return shiroRealm;
    }
    //配置自定义的密码比较器
    @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);
 
    //判断是否拦截，false为拦截，true为允许
    @Override
    public boolean isAccessAllowed(ServletRequest req, ServletResponse resp, Object object) throws Exception {
        Subject subject = getSubject(req,resp);
        String url = getPathWithinApplication(req);
        log.info("当前用户正在访问的url为 " + url);
        log.info("subject.isPermitted(url);"+subject.isPermitted(url));
        //可自行根据需要判断是否拦截，可以获得subject判断用户权限，也可以使用req获得请求头请求体信息
        //return true;
        return false;        
    }
 
    //上面的方法返回false后(被拦截)，会进入这个方法；这个方法返回false表示处理完毕(不放行)；返回true表示需要继续处理(放行)
    @Override
    public boolean onAccessDenied(ServletRequest request, ServletResponse response) throws Exception {     
        //从req中获得的值，也可以自己使用其它判断是否放行的方法
        String username = request.getParameter("name");
        String password = request.getParameter("password");
        //创建token对象
        UsernamePasswordToken usernamePasswordToken=new UsernamePasswordToken(username,password);
        Subject subject = SecurityUtils.getSubject();
        try {
            //使用subject对象的login方法验证该token能否登录(使用方法2中的shiroRealm.java中的方法验证)
            subject.login(usernamePasswordToken);
        } catch (Exception e) {
            //log.info("登陆失败");
            //log.info(e.getMessage());
            return false;
        }
        //log.info("登陆成功");
        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;
        //获得用户输入的密码:(可以采用加盐(salt)的方式去检验)
        String inPassword = new String(utoken.getPassword());
        //获得数据库中的密码
        String dbPassword=(String) info.getCredentials();
        //进行密码的比对
        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);   //完成登录
            //自定义的JavaBean，用于保存用户名、密码、权限3个字段
            User user=(User) subject.getPrincipal();
            //可选，可放入session，以备后续使用
            session.setAttribute("user", user);
            //跳转到登录成功页(controller)
            return "forward:/loginSuccess";
        } catch(Exception e) {
            //登录失败，跳转回登录页(html)
            return "login";
        } 
    }
    @RequestMapping("/logOut")
    public String logOut(HttpSession session) {
        Subject subject = SecurityUtils.getSubject();
        subject.logout();
        //session.removeAttribute("user");
        return "login";
    }
}