新增：JSON 文件格式化预览功能 (#685)

server/src/main/java/cn/keking/service/impl/JsonFilePreviewImpl.java

@@ -0,0 +1,27 @@
+package cn.keking.service.impl;
+
+import cn.keking.model.FileAttribute;
+import cn.keking.service.FilePreview;
+import org.springframework.stereotype.Service;
+import org.springframework.ui.Model;
+
+/**
+ * @author kl (http://kailing.pub)
+ * @since 2025/01/11
+ * JSON 文件预览处理实现
+ */
+@Service
+public class JsonFilePreviewImpl implements FilePreview {
+
+    private final SimTextFilePreviewImpl simTextFilePreview;
+
+    public JsonFilePreviewImpl(SimTextFilePreviewImpl simTextFilePreview) {
+        this.simTextFilePreview = simTextFilePreview;
+    }
+
+    @Override
+    public String filePreviewHandle(String url, Model model, FileAttribute fileAttribute) {
+        simTextFilePreview.filePreviewHandle(url, model, fileAttribute);
+        return JSON_FILE_PREVIEW_PAGE;
+    }
+}