feat: get all users

src/main/java/com/example/domain/user/controller/UserController.java

@@ -1,17 +1,25 @@
 package com.example.domain.user.controller;
 
 import com.example.domain.user.dto.CreateUserDto;
+import com.example.domain.user.dto.UserDto;
 import com.example.domain.user.service.UserService;
 import lombok.RequiredArgsConstructor;
 import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.*;
 
+import java.util.List;
+
 @RestController
 @RequestMapping("/user")
 @RequiredArgsConstructor
 public class UserController {
     private final UserService userService;
 
+    @GetMapping
+    public List<UserDto> getUsers() {
+        return userService.getUsers();
+    }
+
     @PostMapping("/join")
     public ResponseEntity<String> join(@RequestBody CreateUserDto user) {
         userService.createUser(user);

src/main/java/com/example/domain/user/dto/UserDto.java

@@ -0,0 +1,15 @@
+package com.example.domain.user.dto;
+
+import com.example.domain.user.entity.User;
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+
+@Getter
+@AllArgsConstructor
+public class UserDto {
+    private long id;
+    private String name;
+    static public UserDto of(User user) {
+        return new UserDto(user.getId(), user.getName());
+    }
+}

src/main/java/com/example/domain/user/service/UserService.java

@@ -2,6 +2,7 @@
 
 import com.example.domain.post.repository.PostRepository;
 import com.example.domain.user.dto.CreateUserDto;
+import com.example.domain.user.dto.UserDto;
 import com.example.domain.user.entity.User;
 import com.example.domain.user.repository.UserRepository;
 import com.example.global.util.UserUtil;
@@ -11,6 +12,8 @@
 import org.springframework.stereotype.Service;
 import org.springframework.web.server.ResponseStatusException;
 
+import java.util.List;
+
 @Service
 @RequiredArgsConstructor
 public class UserService {
@@ -19,6 +22,12 @@ public class UserService {
     private final PasswordEncoder passwordEncoder;
     private final UserUtil userUtil;
 
+    public List<UserDto> getUsers() {
+        return userRepository.findAll().stream()
+                .map(UserDto::of)
+                .toList();
+    }
+
     public void createUser(CreateUserDto createUserDto) {
         if(isUserExist(createUserDto.getUsername())) throw new ResponseStatusException(HttpStatus.BAD_REQUEST, "Username already exists");
         User user = User.builder()