文件下载bug

src/main/java/com/xujie/sys/modules/pms/service/Impl/EamObjectServiceImpl.java

@@ -26,6 +26,8 @@ import jakarta.servlet.http.HttpServletResponse;
 import java.io.*;
 import java.net.URL;
 import java.net.URLConnection;
+import java.net.URLEncoder;
+import java.nio.charset.StandardCharsets;
 import java.util.ArrayList;
 import java.util.Date;
 import java.util.List;
@@ -264,39 +266,39 @@ public class EamObjectServiceImpl implements EamObjectService {
     }
 
     @Override
-    public void downLoadObjectFile(Integer id, HttpServletResponse response) throws UnsupportedEncodingException {
-        //处理路径和名称
+    public void downLoadObjectFile(Integer id, HttpServletResponse response) {
         List<SysOssEntity> getFileData = eamObjectMapper.getFileData(id);
         if (getFileData.isEmpty()) {
             throw new RuntimeException("该文件不存在，请刷新列表");
         }
-        File file = new File(getFileData.get(0).getUrl());
-        //读取缓存1kb
-        byte[] buffer = new byte[1024];
-        FileInputStream fis = null;
-        BufferedInputStream bis = null;
-        //FileOutputStream fos = null;
-        //BufferedOutputStream bos = null;
-        response.setContentType("application/force-download;charset=utf-8");
-        response.setHeader("Content-disposition", "attachment; filename=" + new String(getFileData.get(0).getFileName().getBytes("gbk"), "iso8859-1"));
+        File file = new File(getFileData.getFirst().getUrl());
+        if (!file.exists()) {
+            throw new RuntimeException("文件不存在");
+        }
+        // 核心：先 reset，清空所有可能的 header
+        response.reset();
+        response.setContentType("application/octet-stream");
+        response.setCharacterEncoding("UTF-8");
         try {
-            //读取文件
-            fis = new FileInputStream(file);
-            //加缓存
-            bis = new BufferedInputStream(fis);
-            //开始读取
-            int i = bis.read(buffer);
-            //设置输出流
-            ServletOutputStream os = response.getOutputStream();
-            //开始循环读取
-            while (i != -1) {
-                os.write(buffer, 0, i);
-                i = bis.read(buffer);
+            String fileName = URLEncoder.encode(getFileData.getFirst().getFileName(), StandardCharsets.UTF_8).replaceAll("\\+", "%20");
+            response.setHeader(
+                    "Content-Disposition",
+                    "attachment; filename*=UTF-8''" + fileName
+            );
+            try (
+                    BufferedInputStream bis = new BufferedInputStream(new FileInputStream(file));
+                    ServletOutputStream os = response.getOutputStream()
+            ) {
+                byte[] buffer = new byte[8192];
+                int len;
+                while ((len = bis.read(buffer)) != -1) {
+                    os.write(buffer, 0, len);
+                }
+                os.flush();
             }
-            fis.close();
-            //fos.close();
         } catch (Exception e) {
-            throw new RuntimeException(e.getMessage());
+            // 不能再写 response 了
+            throw new RuntimeException("文件下载失败", e);
         }
     }