Shiro学习笔记六(自定义Reaml-使用数据库设置 user roles permissions)

梅花

发布于 2020-09-28 16:04:43

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发布于 2020-09-28 16:04:43

文章被收录于专栏：梅花的学习记录梅花的学习记录

1.工程目录

pom文件还和以前设置的一样就是添加了一个数据库驱动，

 <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>
    
    <!-- 添加servlet支持 -->
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>javax.servlet-api</artifactId>
        <version>3.1.0</version>
    </dependency>
    
    <dependency>
        <groupId>javax.servlet.jsp</groupId>
        <artifactId>javax.servlet.jsp-api</artifactId>
        <version>2.3.1</version>
    </dependency>
    
    <!-- 添加jstl支持 -->
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>jstl</artifactId>
        <version>1.2</version>
    </dependency>
    
    <!-- 添加日志支持 -->
    <dependency>
        <groupId>log4j</groupId>
        <artifactId>log4j</artifactId>
        <version>1.2.17</version>
    </dependency>
    
    
    <dependency>
        <groupId>commons-logging</groupId>
        <artifactId>commons-logging</artifactId>
        <version>1.2</version>
    </dependency>
    
    <!-- 添加shiro支持 -->
    <dependency>
        <groupId>org.apache.shiro</groupId>
        <artifactId>shiro-core</artifactId>
        <version>1.2.4</version>
    </dependency>
    
    <dependency>
        <groupId>org.apache.shiro</groupId>
        <artifactId>shiro-web</artifactId>
        <version>1.2.4</version>
    </dependency>
    
    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-api</artifactId>
        <version>1.7.12</version>
    </dependency>
    
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>5.1.37</version>
    </dependency>
    
    
  </dependencies>

shiro.ini中的配置

[main]
authc.loginUrl=/login
roles.unauthorizedUrl=/unauthorized.jsp
perms.unauthorizedUrl=/unauthorized.jsp


myRealm=com.zuoyan.shiro.realm.MyRealm
securityManager.realms=$myRealm

[urls]
/login=anon
/admin*=authc
/student=roles[teacher]
/teacher=perms["user:create"]

简单的解释说明一下Realm，这个我解释不清楚，就引用了别人博客上面的

对于什么是Realm，我使用过之后，个人总结一下：shiro要进行身份验证，就要从realm中获取相应的身份信息来进行验证，简单来说，我们可以自行定义realm，在realm中，从数据库获取身份信息，然后和用户输入的身份信息进行匹配。这一切都由我们自己来定义。

下面就贴出我们自定义realm 的代码

 1 package com.zuoyan.shiro.realm;
 2 
 3 import java.sql.Connection;
 4 
 5 import org.apache.shiro.authc.AuthenticationException;
 6 import org.apache.shiro.authc.AuthenticationInfo;
 7 import org.apache.shiro.authc.AuthenticationToken;
 8 import org.apache.shiro.authc.SimpleAuthenticationInfo;
 9 import org.apache.shiro.authz.AuthorizationInfo;
10 import org.apache.shiro.authz.SimpleAuthorizationInfo;
11 import org.apache.shiro.realm.AuthorizingRealm;
12 import org.apache.shiro.subject.PrincipalCollection;
13 
14 import com.zuoyan.shiro.dao.UserDao;
15 import com.zuoyan.shiro.entity.User;
16 import com.zuoyan.shiro.utils.DbUtil;
17 
18 public class MyRealm extends AuthorizingRealm{
19 
20     private UserDao userDao=new UserDao();
21     private DbUtil dbUtil=new DbUtil();
22     
23     /*
24      * 用于授权
25      */
26     @Override
27     protected AuthorizationInfo doGetAuthorizationInfo(PrincipalCollection principals) {
28         String userName=(String)principals.getPrimaryPrincipal();
29         SimpleAuthorizationInfo authorizationInfo=new SimpleAuthorizationInfo();
30         Connection con=null;
31         try{
32             con=dbUtil.getCon();
33             authorizationInfo.setRoles(userDao.getRoles(con,userName));
34             authorizationInfo.setStringPermissions(userDao.getPermissions(con,userName));
35         }catch(Exception e){
36             e.printStackTrace();
37         }finally{
38             try {
39                 dbUtil.closeCon(con);
40             } catch (Exception e) {
41                 // TODO Auto-generated catch block
42                 e.printStackTrace();
43             }
44         }
45         return authorizationInfo;
46     }
47     
48     /*
49      * 用于认证
50      */
51 
52     @Override
53     protected AuthenticationInfo doGetAuthenticationInfo(AuthenticationToken token) throws AuthenticationException {
54         String userName=(String)token.getPrincipal();
55         Connection con=null;
56         try{
57             con=dbUtil.getCon();
58             User user=userDao.getByUserName(con, userName);
59             if(user!=null){
60                 AuthenticationInfo authcInfo=new SimpleAuthenticationInfo(user.getUserName(),user.getPassword(),"xx");
61                 return authcInfo;
62             }else{
63                 return null;
64             }
65         }catch(Exception e){
66             e.printStackTrace();
67         }finally{
68             try {
69                 dbUtil.closeCon(con);
70             } catch (Exception e) {
71                 // TODO Auto-generated catch block
72                 e.printStackTrace();
73             }
74         }
75         return null;
76     }
77 
78 }

AuthenticationInfo authcInfo=new SimpleAuthenticationInfo(user.getUserName(),user.getPassword(),"xx");
对于这句话，我一开始的理解就是 先查出来标准的账号密码在自定义中的Realm中进行比对，但是正确的是这里设置的是标准的账号密码
比对应该是在下一步

UserDao的就是在数据库中进行查找

 1 package com.zuoyan.shiro.dao;
 2 
 3 import java.sql.Connection;
 4 import java.sql.PreparedStatement;
 5 import java.sql.ResultSet;
 6 import java.util.HashSet;
 7 import java.util.Set;
 8 
 9 import com.zuoyan.shiro.entity.User;
10 
11 
12 
13 public class UserDao {
14 
15     public User getByUserName(Connection con,String userName)throws Exception{
16         User resultUser=null;
17         String sql="select * from t_user where userName=?";
18         PreparedStatement pstmt=con.prepareStatement(sql);
19         pstmt.setString(1, userName);
20         ResultSet rs=pstmt.executeQuery();
21         if(rs.next()){
22             resultUser=new User();
23             resultUser.setId(rs.getInt("id"));
24             resultUser.setUserName(rs.getString("userName"));
25             resultUser.setPassword(rs.getString("password"));
26         }
27         return resultUser;
28     }
29 
30     public Set<String> getRoles(Connection con, String userName) throws Exception{
31         Set<String> roles=new HashSet<String>();
32         String sql="select * from t_user u,t_roles r where u.roleId=r.id and u.userName=?";
33         PreparedStatement pstmt=con.prepareStatement(sql);
34         pstmt.setString(1, userName);
35         ResultSet rs=pstmt.executeQuery();
36         while(rs.next()){
37             roles.add(rs.getString("roleName"));
38         }
39         return roles;
40     }
41 
42     public Set<String> getPermissions(Connection con, String userName)throws Exception {
43         Set<String> permissions=new HashSet<String>();
44         String sql="select * from t_user u,t_roles r,t_permission p where u.roleId=r.id and p.roleId=r.id and u.userName=?";
45         PreparedStatement pstmt=con.prepareStatement(sql);
46         pstmt.setString(1, userName);
47         ResultSet rs=pstmt.executeQuery();
48         while(rs.next()){
49             permissions.add(rs.getString("permissionName"));
50         }
51         return permissions;
52     }
53 }