2024.5.24 Friday
接上文【WEEK13】 【DAY4】Shiro第四部分【中文版】

15.7.Shiro请求授权的实现

15.7.1.修改ShiroConfig.java

15.7.1.1.添加一行验证授权的代码

//授权。正常情况下，应该跳转到未授权页面，但是此时由于只添加了以下的验证，导致直接跳转到401页面
filterMap.put("/user/add","perms[user:add]");

15.7.1.2.重启

任选一用户登录，尝试访问“add”页面：由于用户权限不足不能访问。

15.7.2.修改MyController.java

package com.P40.controller;import org.apache.shiro.SecurityUtils;
import org.apache.shiro.authc.AuthenticationException;
import org.apache.shiro.authc.IncorrectCredentialsException;
import org.apache.shiro.authc.UnknownAccountException;
import org.apache.shiro.authc.UsernamePasswordToken;
import org.apache.shiro.subject.Subject;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;@Controller
public class MyController {@RequestMapping({"/", "/index"})public String toIndex(Model model){model.addAttribute("msg","hello, Shiro");return "index";}@RequestMapping("/user/add")public String add(){return "user/add";}@RequestMapping("/user/update")public String update(){return "user/update";}@RequestMapping("/toLogin")public String toLogin(){return "login";}@RequestMapping("/login")public String login(String username, String password, Model model){//获取当前的用户Subject subject = SecurityUtils.getSubject();//封装用户的登录数据UsernamePasswordToken token = new UsernamePasswordToken(username,password);//执行登录的方法，没有异常则成功了，选中代码后Ctrl+Alt+T添加try catchtry {subject.login(token);return "index";} catch (UnknownAccountException e) {   //用户名不存在model.addAttribute("msg","用户名错误");return "login";} catch (IncorrectCredentialsException e) {   //密码错误model.addAttribute("msg","密码错误");return "login";}}@RequestMapping("/noauth")@ResponseBodypublic String unauthorized(){return "未授权，禁止访问此页面";}
}

15.7.3.修改ShiroConfig.java

添加一个未授权页面的跳转

package com.P40.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@Beanpublic ShiroFilterFactoryBean getShiroFilterFactoryBean(@Qualifier("securityManager") DefaultWebSecurityManager defaultWebSecurityManager){ShiroFilterFactoryBean bean = new ShiroFilterFactoryBean();//要配置什么：点击进入ShiroFilterFactoryBean源码查看//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： 必须认证了才能访问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*///登录拦截Map<String,String> filterMap = new LinkedHashMap<>();//授权。正常情况下，应该跳转到未授权页面，但是此时由于只添加了以下的验证，导致直接跳转到401页面filterMap.put("/user/add","perms[user:add]");//        filterMap.put("/user/add","authc");
//        filterMap.put("/user/update","authc");//仅在此处修改add和update页面的访问权限后，重启项目，点击add或update都将被拦截，显示404错误，希望跳转到登录页面filterMap.put("/user/*","authc");   //也可以使用通配符实现（替代上两行的/user/add和/user/update）bean.setFilterChainDefinitionMap(filterMap);//如果没有权限，则需要跳转到登录页bean.setLoginUrl("/toLogin");   //设置登录的请求//未授权页面bean.setUnauthorizedUrl("/noauth");return bean;}//DefaultWebSecurityManager@Bean(name = "securityManager") //给这个类起别名，便于ShiroFilterFactoryBean调用public DefaultWebSecurityManager getDefaultWebSecurityManager(@Qualifier("userRealm") UserRealm userRealm){    //获取UserRealm,但是这里好像不需要使用注解，可以直接调用DefaultWebSecurityManager securityManager = new DefaultWebSecurityManager();//默认的DefaultWebSecurityManager类的类名是defaultWebSecurityManager，只是在这里修改成securityManager//关联UserRealmsecurityManager.setRealm(userRealm);return securityManager;}//创建realm对象，需要自定义类@Beanpublic UserRealm userRealm(){return new UserRealm();}//创建时顺序是相反的（从real->DefaultWebSecurityManager->ShiroFilterFactoryBean）
}

15.7.4.重启

同样是在没有访问add页面的访问权限时尝试访问该页面，此时显示的url和相应的页面如下：

15.7.5.修改UserRealm.java

15.7.5.1.给所有用户增加权限

package com.P40.config;import com.P40.pojo.User;
import com.P40.service.UserService;
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;
import org.springframework.beans.factory.annotation.Autowired;//UserRealm是一个bean
//自定义的UserRealm,必须要继承AuthorizingRealm方法，然后implement methods(alt+insert)
public class UserRealm extends AuthorizingRealm {@AutowiredUserService userService;//授权authorization@Overrideprotected AuthorizationInfo doGetAuthorizationInfo(PrincipalCollection principalCollection) {System.out.println("do doGetAuthorizationInfo 授权");//authorizationSimpleAuthorizationInfo info = new SimpleAuthorizationInfo();   //可以先写new SimpleAuthorizationInfo();然后使用Alt+Enter快捷创建前面的框架info.addStringPermission("user:add");   //给所有登录的用户增加访问User：add的权限，此时登录任一用户都能访问add页面//不能return nullreturn info;}//认证authentication@Overrideprotected AuthenticationInfo doGetAuthenticationInfo(AuthenticationToken authenticationToken) throws AuthenticationException {System.out.println("do doGetAuthenticationInfo 认证");UsernamePasswordToken userToken = (UsernamePasswordToken) authenticationToken;//改为连接真实数据库User user = userService.queryUserByName(userToken.getUsername());if(user == null){   //此用户不存在return null;    //UnknownAccountException}//密码认证,shiro运行return new SimpleAuthenticationInfo("",user.getPwd(),"");}
}

15.7.5.2.重启验证

Shiro请求授权的实现 这部分内容还剩一半，详见【WEEK14】 【DAY1】Shiro第六部分【中文版】