✨ feat: ImageUtil 추가

src/main/java/com/grimpan/emodiary/exception/ErrorCode.java

@@ -15,6 +15,7 @@ public enum ErrorCode {
 
     // Server
     SERVER_ERROR(HttpStatus.INTERNAL_SERVER_ERROR, "내부 서버 문제입니다."),
+    FILE_IO_ERROR(HttpStatus.INTERNAL_SERVER_ERROR, "파일 입출력 에러입니다."),
 
     // Bad Request Error
     NOT_EXIST_PARAM(HttpStatus.BAD_REQUEST, "요청에 필요한 데이터가 없습니다."),

src/main/java/com/grimpan/emodiary/unit/ImageUtil.java

@@ -0,0 +1,51 @@
+package com.grimpan.emodiary.unit;
+
+import com.grimpan.emodiary.exception.CommonException;
+import com.grimpan.emodiary.exception.ErrorCode;
+import jakarta.xml.bind.DatatypeConverter;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.stereotype.Component;
+
+import javax.imageio.ImageIO;
+import java.awt.image.BufferedImage;
+import java.io.ByteArrayInputStream;
+import java.io.File;
+import java.io.IOException;
+
+@Component
+@RequiredArgsConstructor
+public class ImageUtil {
+    public void decoder(String base64, String imagePath) {
+        String data = base64.split(",")[0];
+
+        byte[] imageBytes = DatatypeConverter.parseBase64Binary(data);
+
+        try {
+            BufferedImage bufImg = ImageIO.read(new ByteArrayInputStream(imageBytes));
+
+            ImageIO.write(bufImg, "jpg", new File(imagePath));
+        } catch (IOException e) {
+            throw new CommonException(ErrorCode.FILE_IO_ERROR, null);
+        }
+    }
+
+    public String encoder(String imagePath) {
+        String base64 = null;
+
+        try {
+            BufferedImage bufImg = ImageIO.read(new File(imagePath));
+
+            java.io.ByteArrayOutputStream os = new java.io.ByteArrayOutputStream();
+
+            ImageIO.write(bufImg, "jpg", os);
+
+            base64 = DatatypeConverter.printBase64Binary(os.toByteArray());
+        } catch (IOException e) {
+            throw new CommonException(ErrorCode.FILE_IO_ERROR, null);
+        }
+
+        return base64;
+    }
+}