更新文件下载功能

src/main/java/com/dreamchaser/depository_manage/controller/DownLoadFileController.java

@@ -25,25 +25,29 @@ public class DownLoadFileController {
     @RequestMapping("/download")
     public void download(HttpServletRequest request,HttpServletResponse response) {
         try {
-            ClassPathResource classPathResource = new ClassPathResource("static/upload/PrintServer.zip");
-            File file = classPathResource.getFile();
-            InputStream inputStream = classPathResource.getInputStream();
-            //输出文件
-            InputStream fis = new BufferedInputStream(inputStream);
-            byte[] buffer = new byte[fis.available()];
-            fis.read(buffer);
-            fis.close();
-            response.reset();
 
-            //获取文件的名字再浏览器下载页面
-            String name = file.getName();
-            response.addHeader("Content-Disposition", "attachment;filename=" + new String(name.getBytes(), "iso-8859-1"));
-            response.addHeader("Content-Length", "" + file.length());
-            OutputStream out = new BufferedOutputStream(response.getOutputStream());
-            response.setContentType("application/octet-stream");
-            out.write(buffer);
-            out.flush();
-            out.close();
+            String path = "static/upload/PrintServer.zip";
+
+            String fileName = "PrintServer.zip";
+            response.setHeader("content-disposition", "attachment;filename=" + URLEncoder.encode(fileName, "UTF-8"));
+            response.setContentType("content-type:octet-stream");
+            /* .getClassLoader() 方法是在静态文件路径添加一个/ */
+            InputStream inputStream = this.getClass().getClassLoader().getResourceAsStream(path);
+            OutputStream outputStream = response.getOutputStream();
+            try {
+                byte[] buffer = new byte[1024];
+                int len;
+                assert inputStream != null;
+                while ((len = inputStream.read(buffer)) != -1) { /* 将流中内容写出去 .*/
+                    outputStream.write(buffer, 0, len);
+                }
+            }catch (IOException e){
+                e.printStackTrace();
+            }finally {
+                assert inputStream != null;
+                inputStream.close();
+                outputStream.close();
+            }
         } catch (Exception e) {
             e.printStackTrace();
         }