Add Post module

src/main/java/com/openisle/controller/PostController.java

@@ -0,0 +1,64 @@
+package com.openisle.controller;
+
+import com.openisle.model.Post;
+import com.openisle.service.PostService;
+import lombok.Data;
+import lombok.RequiredArgsConstructor;
+import org.springframework.http.ResponseEntity;
+import org.springframework.security.core.Authentication;
+import org.springframework.web.bind.annotation.*;
+
+import java.time.LocalDateTime;
+import java.util.List;
+import java.util.stream.Collectors;
+
+@RestController
+@RequestMapping("/api/posts")
+@RequiredArgsConstructor
+public class PostController {
+    private final PostService postService;
+
+    @PostMapping
+    public ResponseEntity<PostDto> createPost(@RequestBody PostRequest req, Authentication auth) {
+        Post post = postService.createPost(auth.getName(), req.getTitle(), req.getContent());
+        return ResponseEntity.ok(toDto(post));
+    }
+
+    @GetMapping("/{id}")
+    public ResponseEntity<PostDto> getPost(@PathVariable Long id) {
+        Post post = postService.getPost(id);
+        return ResponseEntity.ok(toDto(post));
+    }
+
+    @GetMapping
+    public List<PostDto> listPosts() {
+        return postService.listPosts().stream().map(this::toDto).collect(Collectors.toList());
+    }
+
+    private PostDto toDto(Post post) {
+        PostDto dto = new PostDto();
+        dto.setId(post.getId());
+        dto.setTitle(post.getTitle());
+        dto.setContent(post.getContent());
+        dto.setCreatedAt(post.getCreatedAt());
+        dto.setAuthor(post.getAuthor().getUsername());
+        dto.setViews(post.getViews());
+        return dto;
+    }
+
+    @Data
+    private static class PostRequest {
+        private String title;
+        private String content;
+    }
+
+    @Data
+    private static class PostDto {
+        private Long id;
+        private String title;
+        private String content;
+        private LocalDateTime createdAt;
+        private String author;
+        private long views;
+    }
+}