一、shiro框架简介

Apache Shiro是Java的一个安全框架。其内部架构如下：

下面来介绍下里面的几个重要类：

Subject:主体，应用代码直接交互的对象就是Subject。代表了当前用户，这个用户不一定表示人。(可以暂时理解为用户)

SecurityManager:安全管理器，它管理着所有的Subject。是整个shiro框架的核心，它还其它组件交互。

Authenticator:认证器，负责主体认证。(可以暂时理解为判断是否登陆成功)

Authorizer:授权器，用来决定主体是否有权限进行相应的操作。(可以暂时理解为登陆成功后你拥有哪些权限)

Realm:安全数据源，Shiro从Realm获取安全数据（如用户、角色、权限）从而进行验证。一般需要自定义的。

二、shiro框架认证和授权实现

下面介绍一个自定义realm的demo，来讲解shiro的认证和授权

1、maven项目添加jar包依赖

http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
4.0.0

<groupId>com.imooc</groupId>  
<artifactId>shiro</artifactId>  
<version>1.0-SNAPSHOT</version>

<dependencies>

    <dependency>  
        <groupId>org.apache.shiro</groupId>  
        <artifactId>shiro-core</artifactId>  
        <version>1.4.0</version>  
    </dependency>

    <dependency>  
        <groupId>junit</groupId>  
        <artifactId>junit</artifactId>  
        <version>RELEASE</version>  
    </dependency>

</dependencies>

2、自定义Realm

package 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.crypto.hash.Md5Hash;
import org.apache.shiro.realm.AuthorizingRealm;
import org.apache.shiro.subject.PrincipalCollection;
import org.apache.shiro.util.ByteSource;

import java.util.HashMap;
import java.util.HashSet;
import java.util.Set;

public class CustomRealm extends AuthorizingRealm {

HashMap<String,String> hashMap=new HashMap<String, String>();  
Set<String> set=new HashSet<String>();

//存储了账号和md5和盐值加密后的密码  
{  
    hashMap.put("asdfgh","003dc55c5d91addfead4a4fa347c4f2d");  
    //可以先忽略这个  
    super.setName("abc");  
}

//取出所需的角色和权限，构建simpleAuthorizationInfo对象返回，进行权限认证  
protected AuthorizationInfo doGetAuthorizationInfo(PrincipalCollection principalCollection) {  
    String name= (String) principalCollection.getPrimaryPrincipal();  
    Set<String> roles=getRoleByName(name);  
    SimpleAuthorizationInfo simpleAuthorizationInfo=new SimpleAuthorizationInfo();  
    simpleAuthorizationInfo.setRoles(roles);  
    return simpleAuthorizationInfo;  
}

//存储了账号和对应的角色  
private Set<String> getRoleByName(String name) {  
    Set<String> set=new HashSet<String>();  
    set.add("admin");  
    return set;  
}

//取出所需的密码，构建simpleAuthenticationInfo对象返回，与UsernamePasswordToken进行认证对比  
protected AuthenticationInfo doGetAuthenticationInfo(AuthenticationToken authenticationToken) throws AuthenticationException {  
    String name= (String) authenticationToken.getPrincipal();  
    String password=getPasswordByname(name);  
    if(password==null){  
        return null;  
    }  
    SimpleAuthenticationInfo simpleAuthenticationInfo=new SimpleAuthenticationInfo(name,password,"abc");  
    simpleAuthenticationInfo.setCredentialsSalt(ByteSource.Util.bytes("asdfgh"));  
    return simpleAuthenticationInfo;  
}

private String getPasswordByname(String name) {  
    String password=hashMap.get(name);  
    return password;  
}

//003dc55c5d91addfead4a4fa347c4f2d这个密码就是从这里的出来的  
public static void main(String agrs\[\]){  
    Md5Hash md5Hash=new Md5Hash("123456","asdfgh");  
    System.out.println(md5Hash.toString());  
}  

}

3、测试类

package shirotest;

import org.apache.shiro.SecurityUtils;
import org.apache.shiro.authc.UsernamePasswordToken;
import org.apache.shiro.authc.credential.HashedCredentialsMatcher;
import org.apache.shiro.mgt.DefaultSecurityManager;
import org.apache.shiro.realm.text.IniRealm;
import org.apache.shiro.subject.Subject;
import org.junit.Test;
import realm.CustomRealm;

public class CustomRealmTest {

@Test  
public void Test(){

    CustomRealm customRealm=new CustomRealm();  
    //构件SercurityManager的环境  
    DefaultSecurityManager defaultSecurityManager=new DefaultSecurityManager();  
    //设置自定义的Realm  
    defaultSecurityManager.setRealm(customRealm);

    //加密  
    HashedCredentialsMatcher hashedCredentialsMatcher=new HashedCredentialsMatcher();  
    hashedCredentialsMatcher.setHashAlgorithmName("md5");  
    hashedCredentialsMatcher.setHashIterations(1);  
    customRealm.setCredentialsMatcher(hashedCredentialsMatcher);

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

    UsernamePasswordToken token=new UsernamePasswordToken("asdfgh","123456");  
    subject.login(token);  
    System.out.println("认证是否成功:"+subject.isAuthenticated());

    subject.checkRoles("admin");  
}  

}

以上就是就shiro框架的简单介绍，该demo的地址：https://github.com/professorxin/Java_Demo/tree/master/shiro