文件的下载

 1 protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
 2 
 3         // 下载文件的路径
 4         String realPath = "/Users/zhouxiaoming/workspace/code/java/javaweb-02-servlet-test2/response/target/classes/周.png";
 5         System.out.println("要下载文件的路径：" + realPath);
 6 
 7         // 下载的文件名
 8         String fileName = realPath.substring(realPath.lastIndexOf("/") + 1);
 9 
10         // 设置下载的头信息和编码
11         resp.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(fileName, "utf-8"));
12         // 获取下载文件的输入流
13         FileInputStream in = new FileInputStream(realPath);
14 
15         // 创建缓冲区
16         int len =0;
17         byte[] buffer = new byte[1024];
18 
19         // 获取OutputStream对象
20         ServletOutputStream out = resp.getOutputStream();
21         // 将输入流写到缓冲区，使用OutputStream将数据输出到浏览器
22         while((len = in.read(buffer)) > 0){
23             out.write(buffer, 0 , len);
24         }
25 
26         in.close();
27         out.close();
28 
29     }