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private void downloadFileByOutputStream(HttpServletResponse response)
32 throws FileNotFoundException, IOException {
33 //1.获取要下载的文件的绝对路径
34 String realPath = this.getServletContext().getRealPath("/download/1.JPG");
35 //2.获取要下载的文件名
36 String fileName = realPath.substring(realPath.lastIndexOf("\\")+1);
37 //3.设置content-disposition响应头控制浏览器以下载的形式打开文件
38 response.setHeader("content-disposition", "attachment;filename="+fileName);
39 //4.获取要下载的文件输入流
40 InputStream in = new FileInputStream(realPath);
41 int len = 0;
42 //5.创建数据缓冲区
43 byte[] buffer = new byte[1024];
44 //6.通过response对象获取OutputStream流
45 OutputStream out = response.getOutputStream();
46 //7.将FileInputStream流写入到buffer缓冲区
47 while ((len = in.read(buffer)) > 0) {
48 //8.使用OutputStream将缓冲区的数据输出到客户端浏览器
49 out.write(buffer,0,len);
50 }
51 in.close();
52 }