初步封装

src/main/java/com/seeyon/apps/assetstenant/file/FileHandlerService.java

@@ -0,0 +1,64 @@
+package com.seeyon.apps.assetstenant.file;
+
+import com.seeyon.ctp.common.AppContext;
+import com.seeyon.ctp.common.filemanager.manager.AttachmentManager;
+import com.seeyon.ctp.common.filemanager.manager.FileManager;
+import com.seeyon.ctp.common.po.filemanager.Attachment;
+
+import javax.servlet.http.HttpServletResponse;
+import java.io.BufferedOutputStream;
+import java.io.File;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.net.URLEncoder;
+
+
+
+public class FileHandlerService {
+
+    private AttachmentManager attachmentManager = (AttachmentManager) AppContext.getBean("attachmentManager");
+    private FileManager fileManager = (FileManager) AppContext.getBean("fileManager");
+
+    public void handleFile(String refId, HttpServletResponse response) throws Exception {
+        InputStream inputStream = null;
+        try {
+            Attachment attachment = attachmentManager.getAttachmentByFileURL(Long.valueOf(refId));
+            inputStream = fileManager.getFileInputStream(attachment.getFileUrl());
+
+            // ⭐ 关键：重置
+            response.reset();
+
+            // ⭐ 必须设置类型
+            response.setContentType("application/octet-stream");
+
+            // ⭐ 文件名处理
+            String encodedFileName = URLEncoder.encode(attachment.getFilename(), "UTF-8")
+                    .replaceAll("\\+", "%20");
+
+            response.setHeader("Access-Control-Expose-Headers", "Content-Disposition");
+            response.setHeader(
+                    "Content-Disposition",
+                    "attachment; filename=\"" + attachment.getFilename() + "\"; filename*=UTF-8''" + encodedFileName
+            );
+
+            // ⭐ 输出流
+            OutputStream outputStream = response.getOutputStream();
+
+            byte[] buffer = new byte[2048];
+            int len;
+
+            while ((len = inputStream.read(buffer)) != -1) {
+                outputStream.write(buffer, 0, len);
+            }
+
+            outputStream.flush();
+
+        } catch (Exception e) {
+            e.printStackTrace(); // ❗不要吞异常
+        } finally {
+            try {
+                if (inputStream != null) inputStream.close();
+            } catch (Exception ignored) {}
+        }
+    }
+}