UsersService层添加

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

@@ -0,0 +1,21 @@
+package com.example.springdemo.service;
+
+import com.example.springdemo.entities.Users;
+
+import java.util.List;
+import java.util.Optional;
+
+public interface UsersService {
+
+    Users insetUsers(Users user);
+
+    void deleteUsersById(Long id);
+
+    Users updateUsers(Users user);
+
+    List<Users> findAllUsers();
+
+    Optional<Users> findById(Long id);
+
+    Users findByName(String name);
+}

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

@@ -0,0 +1,45 @@
+package com.example.springdemo.service;
+
+import com.example.springdemo.dao.UsersRepository;
+import com.example.springdemo.entities.Users;
+import jakarta.annotation.Resource;
+import org.springframework.stereotype.Service;
+
+import java.util.List;
+import java.util.Optional;
+
+@Service
+public class UsersServiceImpl implements UsersService {
+    @Resource
+    private UsersRepository usersRepository;
+
+    @Override
+    public Users insetUsers(Users user) {
+        return usersRepository.save(user);
+    }
+
+    @Override
+    public void deleteUsersById(Long id) {
+        usersRepository.deleteById(id);
+    }
+
+    @Override
+    public Users updateUsers(Users user) {
+        return usersRepository.save(user);
+    }
+
+    @Override
+    public List<Users> findAllUsers() {
+        return usersRepository.findAll();
+    }
+
+    @Override
+    public Optional<Users> findById(Long id) {
+        return usersRepository.findById(id);
+    }
+
+    @Override
+    public Users findByName(String name) {
+        return usersRepository.findByName(name);
+    }
+}