extend Spring Security UserDetailService class

src/main/java/com/example/springdemo/service/UsersService.java

@@ -2,11 +2,12 @@ package com.example.springdemo.service;
 
 import com.example.springdemo.entities.Users;
 import com.example.springdemo.entities.password.UsersPassword;
+import org.springframework.security.core.userdetails.UserDetailsService;
 
 import java.util.List;
 import java.util.Optional;
 
-public interface UsersService {
+public interface UsersService extends UserDetailsService {
 
     Users addUser(Users user, UsersPassword userPassword);
 

src/main/java/com/example/springdemo/serviceImpl/UsersServiceImpl.java

@@ -1,17 +1,31 @@
-package com.example.springdemo.service;
+package com.example.springdemo.serviceImpl;
 
 import com.example.springdemo.dao.UsersPasswordRepository;
 import com.example.springdemo.dao.UsersRepository;
+import com.example.springdemo.entities.RBAC.Permissions;
+import com.example.springdemo.entities.RBAC.Roles;
 import com.example.springdemo.entities.Users;
 import com.example.springdemo.entities.password.UsersPassword;
+import com.example.springdemo.service.PermissionsService;
+import com.example.springdemo.service.UsersService;
 import jakarta.annotation.Resource;
+import org.springframework.data.jpa.repository.Modifying;
+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.UsernameNotFoundException;
+import org.springframework.stereotype.Component;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 
+import java.util.ArrayList;
+import java.util.Collection;
 import java.util.List;
 import java.util.Optional;
 
 @Service
+@Component
 public class UsersServiceImpl implements UsersService {
     @Resource
     private UsersRepository usersRepository;
@@ -19,6 +33,9 @@ public class UsersServiceImpl implements UsersService {
     @Resource
     private UsersPasswordRepository usersPasswordRepository;
 
+    @Resource
+    private PermissionsService permissionsService;
+
     @Override
     @Transactional(rollbackFor = Exception.class)
     //添加用户时同步添加密码
@@ -74,9 +91,38 @@ public class UsersServiceImpl implements UsersService {
     }
 
     @Override
+    @Modifying
     @Transactional(rollbackFor = Exception.class)
     //更新用户密码
     public int updateUserPasswordById(String password, Long userId) {
         return usersPasswordRepository.updatePassword(password, userId);
     }
+
+    //根据用户名获取用户信息
+    @Override
+    public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
+        Collection<GrantedAuthority> authorities = new ArrayList<>();
+        // 从数据库中取出用户信息
+        Users user = usersRepository.findByName(username).orElse(null);
+        // 判断用户是否存在
+        if (user == null) {
+            throw new UsernameNotFoundException("用户名不存在");
+        }
+        // 取出密码
+        String password = usersPasswordRepository.findByUsersId(user.getId()).getPassword();
+
+        // 用户角色
+        Roles role = user.getRoles();
+        authorities.add(new SimpleGrantedAuthority("ROLE_".concat(role.getName())));
+
+        //用户权限
+        List<Permissions> permissions = permissionsService.findPermissionsByRoleId(role.getId());
+        for (Permissions permission : permissions) {
+            SimpleGrantedAuthority simpleGrantedAuthority = new SimpleGrantedAuthority(permission.getName());
+            authorities.add(simpleGrantedAuthority);
+        }
+
+        // 返回UserDetails实现类
+        return new User(user.getName(), "{noop}" + password, authorities);
+    }
 }