6、Shiro之自定义realm

1、创建一个包存放我们自定义的realm文件：

创建一个类名为CustomRealm继承AuthorizingRealm并实现父类AuthorizingRealm的方法，最后重写：

 CustomRealm代码：

package com.shiro.myrealm;

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.crypto.hash.Hash;
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;

public class CustomRealm extends AuthorizingRealm {
    //认证方法
    @Override
    protected AuthenticationInfo doGetAuthenticationInfo(AuthenticationToken authenticationToken) throws AuthenticationException {
        /**
         * 重写认证方法
         */
        //1、从主体传过来的认证信息中获取用户名
        String username = (String) authenticationToken.getPrincipal();
        //2、通过用户名到数据库获取凭证
        String password = getPassWordByUsername(username);
        if (password == null) {
            return null;
        }
        SimpleAuthenticationInfo simpleAuthenticationInfo = new SimpleAuthenticationInfo("miyue", password, "test");
        return simpleAuthenticationInfo;
    }

    //授权方法
    @Override
    protected AuthorizationInfo doGetAuthorizationInfo(PrincipalCollection principalCollection) {
        /**
         * 重新授权方法
         */
        String username = (String) principalCollection.getPrimaryPrincipal();
        //从角色和缓存中获取角色数据
        Set<String> roles = getRolesByUsername(username);
        //从角色和缓存中获取权限数据
        Set<String> permission = getPermissionsByUsername(username);
        SimpleAuthorizationInfo simpleAuthorizationInfo=new SimpleAuthorizationInfo();
        simpleAuthorizationInfo.setRoles(roles);
        simpleAuthorizationInfo.setStringPermissions(permission);
        return simpleAuthorizationInfo;
    }

    //下面使用map，set模拟数据库数据返回
    Map<String, String> map = new HashMap<String, String>();

    {
        map.put("miyue", "houru");
    }

    private String getPassWordByUsername(String username) {
        return map.get(username) == null ? null : map.get(username);
    }


    private Set<String> getRolesByUsername(String username) {
        Set<String> set = new HashSet<>();
        set.add("admin");
        set.add("user");
        return set;
    }


    private Set<String> getPermissionsByUsername(String username) {
        Set<String> set = new HashSet<>();
        set.add("user:delete");
        set.add("user:add");
        return set;
    }



}

新建一个测试类MyrealmTest，测试我们自定义的realm：

package com.shiro.shiroframe;

import com.shiro.myrealm.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.jupiter.api.Test;


public class MyrealmTest {
    //引入我们自定义的realm
    CustomRealm customRealm = new CustomRealm();

    @Test
    public void MyrealmTest() {

        DefaultSecurityManager defaultSecurityManager = new DefaultSecurityManager();
        defaultSecurityManager.setRealm(customRealm);
        SecurityUtils.setSecurityManager(defaultSecurityManager);
        Subject subject = SecurityUtils.getSubject();
        UsernamePasswordToken usernamePasswordToken = new UsernamePasswordToken("miyue", "houru");
        subject.login(usernamePasswordToken);
        System.err.println(subject.isAuthenticated());
        subject.checkRoles("admin");
        subject.checkPermission("user:add");
    }


}

上面测试类，验证通过，则控制台不报错，否则报错；