spring Security custom user authentication

First, I need to declare the xml file. I want to customize the user's authentication type, that is, I want to own query from the database

<HTTP pattern = "/ *. HTML" Security = "none" /> 
    <HTTP pattern = "/ CSS / **" Security = "none" /> 
    <HTTP pattern = "/ IMG / **" Security = "none "/> 
    <HTTP pattern =" / JS / ** "Security =" none "/> 
    <HTTP pattern =" / plugins / ** "Security =" none "/> 
    <HTTP pattern =" / Seller / add.do "Security =" none "/> 

    <- use-expressions:! set whether to activate SpEL expression, the default value is true. -> 
    <HTTP-use Expressions = "false"> 
        <-! 
            Configuration SpringSecurity intercept path (blocking rules)
             * pattern: configure blocking rules.   / * Represents all resources under the root path (does not include sub-path) / * represents all of the resources under the root path (sub path included) 
            * Access:

        Open forms authentication 
            username-the Parameter = "username" 
            password-the Parameter = "password" 
            the Login-Page: login page names begin with / 
            default-target-url: login page after a successful jump 
            path submitted: login-processing-url set default "/ login" can be modified 
        -> 
        <Login Login-Page-form = "/ shoplogin.html" default-target-URL = "/ ADMIN / index.html" Always-use-default-target = "to true "authentication-failure-URL =" / shoplogin.html "/> 

        <-! checksums do not use csrf -> 
        <csrf = Disabled" to true "/> 

        <-! configuration does not intercept the page frame -> 
        < headers> 
            <Frame-Options Policy = "SAMEORIGIN" />
        </ headers> 

        <-! cancellation of Configuration ->
        <logout logout-url="/logout" logout-success-url="/shoplogin.html" />
    </http>

    <!-- 配置认证管理器 -->
    <authentication-manager>
        <!-- 认证的提供者 -->
        <authentication-provider user-service-ref="userDetailService">
            <password-encoder ref="passwordEncoder"></password-encoder>
        </authentication-provider>
    </authentication-manager>
<!-- 配置自定义的认证类 -->
    <beans:bean id="userDetailService" class="com.qingmu2.core.service.UserDetailServiceImpl">
        <beans:property name="sellerService" ref="sellerService"></beans:Property> 
<- encryption algorithm when using BCryptPasswordEncoder ->!
    </ Beans: bean>

    <beans:bean id="passwordEncoder" class="org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder"/>

After completion of the custom profile, the need to customize the authentication module implemented class

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) {
             // determine whether a business is audited by. 
            IF ( "1" .equals (seller.getStatus ())) {
                 // create a collection, storing permissions for 
                HashSet <the GrantedAuthority> Authorities = new new HashSet <> (); 
                authorities.add ( new new SimpleGrantedAuthority ( "ROLE_SELLER" ));
                 // this information back to the user authentication based 
                return  new new the 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;
    }
}