...

src/main/kotlin/kr/lunaticbum/back/lun/configs/AppConfig.kt

@@ -17,7 +17,7 @@ class AppConfig : WebMvcConfigurer {
     @Value("\${resource.location}")
     private val resourceLocation: String? = null
 
-    val cacheControl: CacheControl = CacheControl.maxAge(Duration.ofDays(365))
+    val cacheControl: CacheControl = CacheControl.maxAge(Duration.ofHours(1))
 
     @Bean
     fun authInterceptor(): BumsInterceptor {

src/main/kotlin/kr/lunaticbum/back/lun/controllers/BlogController.kt

@@ -218,7 +218,7 @@ class BlogController() {
                         val firstImg: Element? = doc.select("img")?.first()
                         val imgSrc: String = firstImg?.attr("src") ?: ""
                         it.image = imgSrc
-                        it.thumb = imgSrc.replaceBeforeLast(".", "_thumbnail.")
+                        it.thumb = imgSrc.replace(imgSrc.split("/").last(), imgSrc.split("/").last().replace(".","_thumbnail."))
                         generateThumbnail(imgSrc.split("/").last(), 200)
                         it.html = doc.text()
                     }
@@ -233,13 +233,15 @@ class BlogController() {
     fun generateThumbnail(originalPath: String, targetWidth: Int) {
         try {
             val originalFile = File("$uploadPath${File.separator}$originalPath")
-
+            println("origin ${originalPath}")
+            println("thumb ${originalPath
+                .replace(".", "_thumbnail.")}")
             // 썸네일 경로 생성 (예: /upload/uuid.jpg → /upload/uuid_thumbnail.jpg)
-            val thumbnailPath = originalFile.path
+            val thumbnailPath = originalPath
-                .replaceBeforeLast(".", "_thumbnail.")
+                .replace(".", "_thumbnail.")
 
 
-            val thumbnailFile = File(thumbnailPath)
+            val thumbnailFile = File("$uploadPath${File.separator}$thumbnailPath")
             // 썸네일 이미 존재하면 종료
             if (thumbnailFile.exists()) {
                 println("썸네일 이미 존재: $thumbnailPath")
@@ -257,7 +259,7 @@ class BlogController() {
             Thumbnails.of(originalFile)
                 .width(targetWidth)
                 .keepAspectRatio(true)
-                .toFile(thumbnailPath)
+                .toFile(thumbnailFile)
 
             println("썸네일 생성 완료: $thumbnailPath")
         } catch (e: IOException) {

src/main/kotlin/kr/lunaticbum/back/lun/controllers/Home.kt

@@ -5,16 +5,20 @@ import jakarta.servlet.http.HttpServletResponse
 import kr.lunaticbum.back.lun.model.PostManageg
 import kr.lunaticbum.back.lun.model.ResultMV
 import kr.lunaticbum.back.lun.utils.LogService
+import net.coobird.thumbnailator.Thumbnails
 import org.commonmark.node.Node
 import org.commonmark.parser.Parser
 import org.commonmark.renderer.html.HtmlRenderer
 import org.jsoup.Jsoup
 import org.jsoup.nodes.Element
 import org.springframework.beans.factory.annotation.Autowired
+import org.springframework.beans.factory.annotation.Value
 import org.springframework.data.domain.Pageable
 import org.springframework.web.bind.annotation.GetMapping
 import org.springframework.web.bind.annotation.RequestMapping
 import org.springframework.web.bind.annotation.RestController
+import java.io.File
+import java.io.IOException
 import java.net.URLDecoder
 
 @RestController
@@ -42,6 +46,8 @@ class Home {
                         val firstImg: Element? = doc.select("img")?.first()
                         val imgSrc: String = firstImg?.attr("src") ?: ""
                         it.image = imgSrc
+                        it.thumb = imgSrc.replace(imgSrc.split("/").last(), imgSrc.split("/").last().replace(".","_thumbnail."))
+                        generateThumbnail(imgSrc.split("/").last(), 200)
                         it.html = doc.text()
                     }
                     it.title = if ((it.title?.length ?: 0) >= 1) it.title else ""
@@ -52,6 +58,49 @@ class Home {
         return vm
     }
 
+    @Value("\${image.upload.path}")
+    private val uploadPath: String? = null
+
+    @Value("\${resource.handler}")
+    private val resourceHandler: String? = null
+
+    fun generateThumbnail(originalPath: String, targetWidth: Int) {
+        try {
+            val originalFile = File("$uploadPath${File.separator}$originalPath")
+            println("origin ${originalPath}")
+            println("thumb ${originalPath
+                .replace(".", "_thumbnail.")}")
+            // 썸네일 경로 생성 (예: /upload/uuid.jpg → /upload/uuid_thumbnail.jpg)
+            val thumbnailPath = originalPath
+                .replace(".", "_thumbnail.")
+
+
+            val thumbnailFile = File("$uploadPath${File.separator}$thumbnailPath")
+            // 썸네일 이미 존재하면 종료
+            if (thumbnailFile.exists()) {
+                println("썸네일 이미 존재: $thumbnailPath")
+                return
+            }
+
+
+            // 원본 파일 존재 확인
+            if (!originalFile.exists()) {
+                println("원본 파일 없음: $originalPath")
+                return
+            }
+
+            // 썸네일 생성 (가로 기준 비율 유지)
+            Thumbnails.of(originalFile)
+                .width(targetWidth)
+                .keepAspectRatio(true)
+                .toFile(thumbnailFile)
+
+            println("썸네일 생성 완료: $thumbnailFile")
+        } catch (e: IOException) {
+            println("썸네일 생성 실패: ${e.message}")
+        }
+    }
+
 
     @GetMapping("/h2")
     fun home2() : ResultMV {