首先我需要在xml文件中声明.我要进行自定义用户的认证类,也就是我要自己从数据库中进行查询

配置完自定义的文件以后,在需要自定义认证类的模块中实现

UserDetailsService

package com.qingmu2.core.service;import com.alibaba.dubbo.config.annotation.Reference;import com.qingmu2.core.pojo.seller.Seller;import org.springframework.beans.factory.annotation.Autowired;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;import java.util.ArrayList;import java.util.HashMap;import java.util.HashSet;import java.util.List;/** * 自定义的认证类 * @Auther:qingmu * @Description:脚踏实地,只为出人头地 * @Date:Created in 8:33 2019/5/31 */public class UserDetailServiceImpl implements UserDetailsService {  private SellerService sellerService;  public UserDetailServiceImpl() {  }  @Override  public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {    Seller seller = sellerService.findOne(username);    if(null!=seller){      //判断一次商家是否被审核通过.      if("1".equals(seller.getStatus())){        //创建一个集合,用来存储权限        HashSet authorities = new HashSet<>();        authorities.add(new SimpleGrantedAuthority("ROLE_SELLER"));        //将这个用户的信息返回给认证类        return new User(username,seller.getPassword(),authorities);      }    }    //没有这个用户,则返回null    return null;  }  public UserDetailServiceImpl(SellerService sellerService) {    this.sellerService = sellerService;  }  public SellerService getSellerService() {    return sellerService;  }  public void setSellerService(SellerService sellerService) {    this.sellerService = sellerService;  }}