Shiro 自定义Realm

本篇博客讲的是如何自定义Realm。

在 https://blog.csdn.net/weixin_42236165/article/details/92801105 该博客上改进实现。

自定义Realm

1.在main的java下创建一个com.imooc.shiro.realm包然后创建CustomRealm类

CustomRealm类代码：

package com.imooc.shiro.realm;

import org.apache.shiro.authc.AuthenticationException;
import org.apache.shiro.authc.AuthenticationInfo;
import org.apache.shiro.authc.AuthenticationToken;
import org.apache.shiro.authc.SimpleAuthenticationInfo;
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 java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;

/**
 *
 * @author 宋政宏
 * @date 2019-06-21 15:57
 */
public class CustomRealm extends AuthorizingRealm {

    Map<String,String> userMap = new HashMap<>(16);
    {
        userMap.put("Mark","123456");

        super.setName("customRealm");
    }
    //授权
    @Override
    protected AuthorizationInfo doGetAuthorizationInfo(PrincipalCollection principalCollection) {

        String userName = (String) principalCollection.getPrimaryPrincipal();
        //从数据库或者缓存中获取角色数据
        Set<String> roles = getRolesByUserName(userName);
        //从数据库或者缓存中获取权限数据
        Set<String> permissions = getPermissionsByUserName(userName);
        SimpleAuthorizationInfo simpleAuthorizationInfo = new SimpleAuthorizationInfo();
        simpleAuthorizationInfo.setStringPermissions(permissions);
        simpleAuthorizationInfo.setRoles(roles);

        return simpleAuthorizationInfo;
    }

    private Set<String> getPermissionsByUserName(String userName) {
        Set<String> sets = new HashSet<>();
        sets.add("user:delete");
        sets.add("user:add");
        return sets;
    }

    /**
     *
     * @param userName
     * @return
     */
    private Set<String> getRolesByUserName(String userName) {
        Set<String> sets = new HashSet<>();
        sets.add("admin");
        sets.add("user");
        return sets;
    }

    //认证
    //AuthenticationToken认证信息
    @Override
    protected AuthenticationInfo doGetAuthenticationInfo(AuthenticationToken authenticationToken) throws AuthenticationException {

        //1.从主体传过来的认证信息中，获得用户名
        String userName = (String) authenticationToken.getPrincipal();

        //2.通过用户名到数据库中获取凭证

        String password = getPasswordByUserName(userName);
        if(password == null){
            return null;
        }
        SimpleAuthenticationInfo authenticationInfo = new SimpleAuthenticationInfo("Mark",password,"customRealm");
        return authenticationInfo;
    }
    /**
     * 模拟数据库查询凭证
     * @param userName
     * @return
     */
    private String getPasswordByUserName(String userName){
        return userMap.get(userName);
    }
}

2.在test创建CustomRealmTest类

代码如下：

package com.imooc.test;

import com.imooc.shiro.realm.CustomRealm;
import org.apache.shiro.SecurityUtils;
import org.apache.shiro.authc.UsernamePasswordToken;
import org.apache.shiro.mgt.DefaultSecurityManager;
import org.apache.shiro.subject.Subject;
import org.junit.Test;

/**
 *
 * @author 宋政宏
 * @date 2019-06-21 16:13
 */
public class CustomRealmTest {
    @Test
    public void testAuthentication(){

        CustomRealm customRealm = new CustomRealm();

        //1.构建SecurityManager环境
        DefaultSecurityManager defaultSecurityManager = new DefaultSecurityManager();
        defaultSecurityManager.setRealm(customRealm);

        //2.主体提交认证请求
        SecurityUtils.setSecurityManager(defaultSecurityManager);
        Subject subject = SecurityUtils.getSubject();

        UsernamePasswordToken token = new UsernamePasswordToken("Mark","123456");
        subject.login(token);

        System.out.println("isAuthenticated："+ subject.isAuthenticated());

     /*   //验证角色
        subject.checkRole("admin");

        //验证权限
        subject.checkPermission("user:update");*/
     subject.checkRole("admin");

     subject.checkPermissions("user:add","user:delete");
    }
}

3.运行

成功！