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src/main/java/fr/eni/demo/bll/UserService.java

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+package fr.eni.demo.bll;
+
+import fr.eni.demo.bo.User;
+import java.util.Optional;
+import java.util.List;
+
+public interface UserService {
+    void addUser(User user);
+    Optional<User> findByUsername(String username);
+    List<User> findAll();
+} 

src/main/java/fr/eni/demo/bll/UserServiceImpl.java

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+package fr.eni.demo.bll;
+
+import fr.eni.demo.bo.User;
+import fr.eni.demo.dal.UserRepository;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.security.crypto.password.PasswordEncoder;
+import org.springframework.stereotype.Service;
+
+import java.util.List;
+import java.util.Optional;
+
+@Service
+public class UserServiceImpl implements UserService {
+
+    private final UserRepository userRepository;
+    private final PasswordEncoder passwordEncoder;
+
+    @Autowired
+    public UserServiceImpl(UserRepository userRepository, PasswordEncoder passwordEncoder) {
+        this.userRepository = userRepository;
+        this.passwordEncoder = passwordEncoder;
+    }
+
+    @Override
+    public void addUser(User user) {
+        user.setPassword(passwordEncoder.encode(user.getPassword()));
+        userRepository.save(user);
+    }
+
+    @Override
+    public Optional<User> findByUsername(String username) {
+        return userRepository.findByUsername(username);
+    }
+
+    @Override
+    public List<User> findAll() {
+        return userRepository.findAll();
+    }
+} 

src/main/java/fr/eni/demo/controller/UserController.java

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+package fr.eni.demo.controller;
+
+import fr.eni.demo.bll.UserService;
+import fr.eni.demo.bo.User;
+import lombok.RequiredArgsConstructor;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+
+import java.util.List;
+
+@RestController
+@RequestMapping("/api/users")
+@RequiredArgsConstructor
+public class UserController {
+
+    private final UserService userService;
+
+    @PostMapping
+    public ResponseEntity<User> createUser(@RequestBody User user) {
+        userService.addUser(user);
+        return ResponseEntity.ok(user);
+    }
+
+    @GetMapping
+    public ResponseEntity<List<User>> getAllUsers() {
+        return ResponseEntity.ok(userService.findAll());
+    }
+
+    @GetMapping("/{username}")
+    public ResponseEntity<User> getUserByUsername(@PathVariable String username) {
+        return userService.findByUsername(username)
+                .map(ResponseEntity::ok)
+                .orElse(ResponseEntity.notFound().build());
+    }
+} 

src/main/java/fr/eni/demo/dal/UserRepository.java

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+package fr.eni.demo.dal;
+
+import fr.eni.demo.bo.User;
+import org.springframework.data.mongodb.repository.MongoRepository;
+import org.springframework.stereotype.Repository;
+
+import java.util.Optional;
+
+@Repository
+public interface UserRepository extends MongoRepository<User, String> {
+    Optional<User> findByUsername(String username);
+}