一、SpringSecurity简介

安全管理框架

二、SpringSecurity主要功能

1. 认证： 用户认证（依赖jwt的token）
2. 授权： 经过认证后，判断用户是否有权限进行某个操作

三、SpringSecurity的Maven依赖

SpringBoot 里面有具体启动器，所以不需要指明版本号

<dependency>
   <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-security</artifactId>
</dependency>

四、Security本质：过滤器链

debugger查看run容器

五、用户认证

1、根据用户实体，封装一个UserDetails实体对象LoginUser类

package com.zhw.domain.entity;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.userdetails.UserDetails;

import java.util.Collection;


@Data
@AllArgsConstructor
@NoArgsConstructor
public class LoginUser implements UserDetails {

    private Admin admin;
    @Override
    public Collection<? extends GrantedAuthority> getAuthorities() {
        return null;
    }
    @Override
    public String getPassword() {
        return admin.getPassword();
    }
    @Override
    public String getUsername() {
        return admin.getUserName();
    }
    @Override
    public boolean isAccountNonExpired() {
        return true;
    }
    @Override
    public boolean isAccountNonLocked() {
        return true;
    }
    @Override
    public boolean isCredentialsNonExpired() {
        return true;
    }
    @Override
    public boolean isEnabled() {
        return true;
    }
}

2、自定义UserDetailsService接口的实现

package com.zhw.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.zhw.domain.entity.Admin;
import com.zhw.domain.entity.LoginUser;
import com.zhw.mapper.AdminMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.core.userdetails.UsernameNotFoundException;
import org.springframework.stereotype.Service;
import java.util.Objects;

@Service
@SuppressWarnings("all")
public class UserDetailsServiceImpl implements UserDetailsService {
    @Autowired
    private AdminMapper adminMapper;

    @Override
    public UserDetails loadUserByUsername(String username) throws
            UsernameNotFoundException {
        // 根据用户名查询用户信息
        LambdaQueryWrapper<Admin> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(Admin::getUserName, username);
        Admin admin = adminMapper.selectOne(queryWrapper);
        // 判断是否查到用户 如果没查到抛出异常
        if (Objects.isNull(admin)) {
            throw new RuntimeException("用户不存在");
        }
        // 返回用户信息
        // TODO 查询权限信息封装【授权功能】
        return new LoginUser(admin);
    }
}