博客shiro学习笔记_0400_自定义Realm实现身份认证 介绍了认证,这里介绍授权。

1,仅仅通过配置文件来指定权限不够灵活且不方便。在实际的应用中大多数情况下都是将用户信息,角色信息,权限信息 保存到了数据库中。所以需要从数据库中去获取相关的数据信息。可以使用 shiro 提供的JdbcRealm来实现,,也可以自定义realm来实现。使用jdbcRealm往往也不够灵活。所以在实际应用中大多数情况都是自定义Realm来实现。

2,自定义Realm 需要继承 AuthorizingRealm。

例子程序:

新建maven项目:

shiro学习笔记_0600_自定义realm实现授权-LMLPHP

maven依赖:

<dependency>
<groupId>org.apache.shiro</groupId>
<artifactId>shiro-core</artifactId>
<version>1.3.2</version>
</dependency> <dependency>
<groupId>commons-logging</groupId>
<artifactId>commons-logging</artifactId>
<version>1.2</version>
</dependency> <dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency> <dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>1.7.5</version>
</dependency> <dependency>
<groupId>com.mchange</groupId>
<artifactId>c3p0</artifactId>
<version>0.9.5.2</version>
</dependency> <dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.31</version>
</dependency>

shiro.ini配置:

[main]
userRealm=com.lhy.realm.UserRealm
securityManager.realm=$userRealm

log4j.properties:

log4j.rootLogger=info, stdout
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d %p [%c] - %m %n

userRealm:

这里没有使用数据库,配置文件shiro.ini里不用配置[users]信息,因为这里在userRealm里的认证方法里的密码是模拟的,实际肯定会去数据库取。

package com.lhy.realm;

import java.util.ArrayList;
import java.util.List; 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;
/**
* 自定义Realm实现,该Realm类提供了两个方法:
* 1,doGetAuthenticationInfo:获取认证信息
* 2,doGetAuthorizationInfo:获取权限信息
* @author Administrator
*
*/
public class UserRealm extends AuthorizingRealm{ //realm接口的方法
@Override
public String getName() {
return "userRealm";
} //完成身份认证并返回认证信息
//如果身份认证失败,返回null
@Override
protected AuthenticationInfo doGetAuthenticationInfo(
AuthenticationToken token) throws AuthenticationException {
//获取用户输入的用户名
String username = (String)token.getPrincipal();//获取身份信息
System.out.println("username----"+username);
//实际开发是调用service根据用户名去数据库查对应的密码
//假设获取的密码是1111
String password = "1111";
//Object principal, Object credentials, String realmName
SimpleAuthenticationInfo info = new SimpleAuthenticationInfo(username,password,getName());
return info;
} //授权的信息
@Override
protected AuthorizationInfo doGetAuthorizationInfo(PrincipalCollection principals) {
//主的 身份信息
String username = principals.getPrimaryPrincipal().toString();
System.out.println("==========授权===========");
System.out.println("username ---"+username);
//根据用户名到数据库查询当前用户对应的权限信息 ---这里模拟
List<String> permissions = new ArrayList<String>();
permissions.add("user:add");
permissions.add("user:delete");
permissions.add("user:update");
permissions.add("user:find");
/*
* 实现了AuthorizationInfo接口的pojo,内部存的是权限和角色
*/
SimpleAuthorizationInfo info = new SimpleAuthorizationInfo();
//给当前用户分配权限
info.addStringPermissions(permissions);
return info;
}
}

测试程序:

package com.lhy.shiro;

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.config.IniSecurityManagerFactory;
import org.apache.shiro.mgt.SecurityManager;
import org.apache.shiro.subject.Subject;
import org.apache.shiro.util.Factory; public class userRealmDemo { public static void main(String[] args) {
//1,创建SecurityManager工厂 读取shiro配置文件
Factory<SecurityManager> factory = new IniSecurityManagerFactory("classpath:shiro.ini");
//2 通过securityManager工厂获取SecurityManager实例
SecurityManager securityManager = factory.getInstance();
//3 将SecurityManager 对象设置到运行环境
SecurityUtils.setSecurityManager(securityManager);
//4 通过SecurityUtils获取主体subject
Subject subject = SecurityUtils.getSubject();
try {
//5.假设登录名是zhangsan 密码是1111
UsernamePasswordToken token = new UsernamePasswordToken("zhangsan","1111");
//6,登录,进行用户身验证
subject.login(token);
//通过subject判断用户是否通过验证
if(subject.isAuthenticated()){
System.out.println("用户登录成功!");
}
} catch (UnknownAccountException e) {
System.out.println("用户名或密码错误!");
e.printStackTrace();
}catch (IncorrectCredentialsException e) {
System.out.println("用户名或密码错误!");
e.printStackTrace();
} System.out.println(subject.isPermittedAll("user:add","user:delete","user:update"));
//7 退出
subject.logout(); }
}
04-20 19:39