接着3.1的文章，显然使用配置好的用户名和随机生成的密码是不好的，因此设置用户名和密码

Security提供了三种方式

方式一：

通过配置文件设置

server:
  tomcat:
    uri-encoding: UTF-8
  port: 8080
  servlet:
    context-path: /security

spring:
  security:
    user:
      name: ming
      password: ming

自行回去测试，项目放在github上，有兴趣文末有链接

方式二：

通过配置类，具体来说就是编写配置类实现WebSecurityConfiguration接口，重写configure方法

由于security默认是把密码加密的，所以别忘要对密码加密

package cn.sysu.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.config.annotation.authentication.builders.AuthenticationManagerBuilder;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
import org.springframework.security.crypto.password.PasswordEncoder;

@Configuration
public class SecurityConfig1 extends WebSecurityConfigurerAdapter {

    @Override
    protected void configure(AuthenticationManagerBuilder auth) throws Exception {
        BCryptPasswordEncoder bCryptPasswordEncoder = new BCryptPasswordEncoder();
        String password = bCryptPasswordEncoder.encode("ming2");
        auth.inMemoryAuthentication().withUser("ming2").password(password).roles("admin");
    }

    @Bean
    public PasswordEncoder passwordEncoder(){
        return new BCryptPasswordEncoder();
    }
}

方式三（最常用）：

自定义实现类，因为实际开发所有用户名和密码都保存在数据库中
两个重要的接口
UserDetailsService：用于查询数据库用户名和密码过程
PasswordEncoder：数据加密接口

基本步骤：

1. 创建配置类，设置使用哪个UserDetailsService实现类
2. 创建实现类，返回User对象（Spring Security自带了），该对象存储了用户基本信息（用户名和密码）及操作权限

package cn.sysu.config;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.config.annotation.authentication.builders.AuthenticationManagerBuilder;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
import org.springframework.security.crypto.password.PasswordEncoder;

@Configuration
public class SecurityConfig2 extends WebSecurityConfigurerAdapter {

    @Autowired
    private UserDetailsService userDetailsService;

    @Autowired
    private PasswordEncoder passwordEncoder;

    @Override
    protected void configure(AuthenticationManagerBuilder auth) throws Exception {
        auth.userDetailsService(userDetailsService).passwordEncoder(passwordEncoder);
    }

    @Bean
    public PasswordEncoder passwordEncoder(){
        return new BCryptPasswordEncoder();
    }
}

package cn.sysu.service.impl;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.authority.AuthorityUtils;
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 org.springframework.security.crypto.password.PasswordEncoder;
import org.springframework.stereotype.Service;

import java.util.List;

@Service("UserDetailsService")
public class MyUserDetailsServiceImpl implements UserDetailsService {

    @Autowired
    private PasswordEncoder passwordEncoder;

    @Override
    public UserDetails loadUserByUsername(String s) throws UsernameNotFoundException {
        List<GrantedAuthority> auths = AuthorityUtils.commaSeparatedStringToAuthorityList("role");
        return new User("ming3",passwordEncoder.encode("ming3"),auths);
    }
}

Github仓库地址
https://github.com/mingweihua/learn_springsecurity