java 的在线下载文件 .pdf

　java  的在线下载文件  .pdf

1.下载资源的本地位置

2.设置响应头

3.下载代码

 1 PeriodicalResource periodicalResource = periodicalResourceService.get(id);
 2         String filePath = periodicalResource.getAttachment();//获取资源位置
 3         File file = new File(periodicalBaseDir + filePath);//本地资源位置
 4         if (file.exists()) {
 5             response.setContentType("application/force-download");// 设置强制下载不打开
 6             response.addHeader("Content-Disposition",
 7                     "attachment;fileName=" + filePath.split("/")[filePath.split("/").length-1]);// 设置文件名
 8             byte[] buffer = new byte[1024];
 9             FileInputStream fis = null;
10             BufferedInputStream bis = null;
11             try {
12                 fis = new FileInputStream(file);
13                 bis = new BufferedInputStream(fis);
14                 OutputStream os = response.getOutputStream();
15                 int i = bis.read(buffer);
16                 while (i != -1) {
17                     os.write(buffer, 0, i);
18                     i = bis.read(buffer);
19                 }
20             } catch (Exception e) {
21                 e.printStackTrace();
22             } finally {
23                 if (bis != null) {
24                     try {
25                         bis.close();
26                     } catch (IOException e) {
27                         e.printStackTrace();
28                     }
29                 }
30                 if (fis != null) {
31                     try {
32                         fis.close();
33                     } catch (IOException e) {
34                         e.printStackTrace();
35                     }
36                 }
37             }
38         }