一、实现UserDetails接口

package com.example.securityzimug.config.auth;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.userdetails.UserDetails;
import java.util.Collection;
public class MyUserDetails implements UserDetails {
    String password; //密码
    String username;  //用户名
    boolean accountNonExpired;   //是否没过期
    boolean accountNonLocked;   //是否没被锁定
    boolean credentialsNonExpired;  //是否没过期
    boolean enabled;  //账号是否可用
    Collection<? extends GrantedAuthority> authorities;  //用户的权限集合
    @Override
    public Collection<? extends GrantedAuthority> getAuthorities() {
        return authorities;
    }
    @Override
    public String getPassword() {
        return password;
    }
    @Override
    public String getUsername() {
        return username;
    }
    @Override
    public boolean isAccountNonExpired() {
        return true;
    }
    @Override
    public boolean isAccountNonLocked() {
        return true;
    }
    @Override
    public boolean isCredentialsNonExpired() {
        return true;
    }
    @Override
    public boolean isEnabled() {
        return enabled;
    }
    public void setPassword(String password) {
        this.password = password;
    }
    public void setUsername(String username) {
        this.username = username;
    }
    public void setAccountNonExpired(boolean accountNonExpired) {
        this.accountNonExpired = accountNonExpired;
    }
    public void setAccountNonLocked(boolean accountNonLocked) {
        this.accountNonLocked = accountNonLocked;
    }
    public void setCredentialsNonExpired(boolean credentialsNonExpired) {
        this.credentialsNonExpired = credentialsNonExpired;
    }
    public void setEnabled(boolean enabled) {
        this.enabled = enabled;
    }
    public void setAuthorities(Collection<? extends GrantedAuthority> authorities) {
        this.authorities = authorities;
    }
}

二、编写mapper

在编写之前需要导入依赖。

<dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.1.3</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
package com.example.securityzimug.config.auth;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Select;
import java.util.List;
@Mapper
public interface MyUserDetailsServiceMapper {
    //根据userID查询用户信息
    @Select("SELECT username,password,enabled\n" +
            "FROM sys_user u\n" +
            "WHERE u.username = #{userId} or u.phone = #{userId}")
    MyUserDetails findByUserName(@Param("userId") String userId);
    //根据userID查询用户角色列表
    @Select("SELECT role_code\n" +
            "FROM sys_role r\n" +
            "LEFT JOIN sys_user_role ur ON r.id = ur.role_id\n" +
            "LEFT JOIN sys_user u ON u.id = ur.user_id\n" +
            "WHERE u.username = #{userId} or u.phone = #{userId}")
    List<String> findRoleByUserName(@Param("userId") String userId);
    //根据用户角色查询用户权限
    @Select({
      "<script>",
         "SELECT url " ,
         "FROM sys_menu m " ,
         "LEFT JOIN sys_role_menu rm ON m.id = rm.menu_id " ,
         "LEFT JOIN sys_role r ON r.id = rm.role_id ",
         "WHERE r.role_code IN ",
         "<foreach collection='roleCodes' item='roleCode' open='(' separator=',' close=')'>",
            "#{roleCode}",
         "</foreach>",
      "</script>"
    })
    List<String> findAuthorityByRoleCodes(@Param("roleCodes") List<String> roleCodes);
}

三、实现UserDetailsService接口

package com.example.securityzimug.config.auth;
import org.springframework.security.core.authority.AuthorityUtils;
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.Component;
import javax.annotation.Resource;
import java.util.List;
import java.util.stream.Collectors;
/**
 * @author baikunlong
 * @date 2020/9/22 23:14
 */
@Component
public class MyUserDetailsService implements UserDetailsService {
    @Resource
    private MyUserDetailsServiceMapper myUserDetailsServiceMapper;
    @Override
    public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
        MyUserDetails myUserDetails = myUserDetailsServiceMapper.findByUserName(username);
        //角色集合
        List<String> roleList = myUserDetailsServiceMapper.findRoleByUserName(username);
        //资源权限集合
        List<String> authorities = myUserDetailsServiceMapper.findAuthorityByRoleCodes(roleList);
        //角色是特殊的权限，前缀规定为ROLE_
        roleList=roleList.stream().map(role->"ROLE_"+role).collect(Collectors.toList());
        authorities.addAll(roleList);
        myUserDetails.setAuthorities(AuthorityUtils.commaSeparatedStringToAuthorityList(String.join(",",authorities)));
        return myUserDetails;
    }
}

四、修改配置类

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注意这里的UserDetailsService一定要使用注入方式，我一开始手动new的，这会导致mapper为空，在service那排错了很久，后来才发现是这边的问题。

五、修改配置文件

spring:
  security:
#    用数据库后，内存模式的就先注释掉吧
#    user:
#      name: admin
#      password: admin
    loginType: JSON
  datasource:
    url: jdbc:mysql://localhost:3306/study_springboot_05_security_zimug?useUnicode=true&characterEncoding=utf-8&useSSL=false&serverTimezone=Asia/Shanghai
    username: root
    password: '123456'
    driver-class-name: com.mysql.cj.jdbc.Driver
#logging:
#  level:
#    root: debug

需要注意的是，配置文件如果是yml文件类型的，密码一定要加单引号或者双引号，不然连接不了数据库的，properties不存在这个问题。

六、动态鉴权

在一开始我们的鉴权都是写的静态的，当有新需求时可能会更改代码，所以需要动态的鉴权。

编写一个类来鉴权。

package com.example.securityzimug.config.auth;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.authority.AuthorityUtils;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.stereotype.Component;
import javax.servlet.http.HttpServletRequest;
import java.util.List;
@Component("rabcService")
public class MyRBACService {
    /**
     * 判断某用户是否具有该request资源的访问权限
     */
    public boolean hasPermission(HttpServletRequest request, Authentication authentication){
        //这个就是UserDetails
        Object principal = authentication.getPrincipal();
        if(principal instanceof UserDetails){
            UserDetails userDetails = ((UserDetails)principal);
            //这里的请求地址就是资源权限名
            List<GrantedAuthority> authorityList =
                    AuthorityUtils.commaSeparatedStringToAuthorityList(request.getRequestURI());
            //判断当前用户是否有这个资源权限
            return userDetails.getAuthorities().contains(authorityList.get(0));
        }
        return false;
    }
}