5.商家系统登录与安全控制
5.1 需求分析
完成商家系统登陆与安全控制，商家账号来自数据库，并实现密码加密
5.2 自定义认证类
（1）pom.xml、web.xml 、login.html 参照运营商管理后台
（2）在 pinyougou-shop-web 创 建 com.pinyougou.service 包 ， 包 下 创 建 类
UserDetailsServiceImpl.java 实现 UserDetailsService 接口

package  com.pinyougou.service; import  java.util.ArrayList; import  java.util.List;
import  org.springframework.security.core.GrantedAuthority;

import  org.springframework.security.core.authority.SimpleGrantedAuthority;

import  org.springframework.security.core.userdetails.User;
import  org.springframework.security.core.userdetails.UserDetails;

import  org.springframework.security.core.userdetails.UserDetailsService;

import  org.springframework.security.core.userdetails.UsernameNotFoundException;

/**

*认证类

*@author  Administrator

*

*/

public  class  UserDetailsServiceImpl  implements  UserDetailsService  { @Override
public  UserDetails  loadUserByUsername(String  username)  throws
UsernameNotFoundException  {

List<GrantedAuthority>  grantedAuths  =  new  ArrayList<GrantedAuthority>(); grantedAuths.add(new  SimpleGrantedAuthority("ROLE_SELLER"));
return  new  User(username,"123456",  grantedAuths);

}

}

（3）在 pinyougou-shop-web 的 spring 目录下创建 spring-security.xml