本文介绍了一种通过编程方式实现文件下载的方法。具体步骤包括：初始化文件路径，设置HTTP响应头，读取文件内容到内存缓冲区，将文件内容写入客户端输出流并刷新关闭流。
File file = new File("G:\\dddd.txt");
response.reset();
InputStream fis = new BufferedInputStream(new FileInputStream(file));
byte[] buffer = new byte[fis.available()];
fis.read(buffer);
fis.close();
response.addHeader("Content-Disposition", "attachment;filename=" + new String(file.getName().getBytes()));
response.addHeader("Content-Length", "" + file.length());
OutputStream toClient = new BufferedOutputStream(response.getOutputStream());
response.setContentType("application/octet-stream");
toClient.write(buffer);
toClient.flush();
toClient.close();
response.reset();
InputStream fis = new BufferedInputStream(new FileInputStream(file));
byte[] buffer = new byte[fis.available()];
fis.read(buffer);
fis.close();
response.addHeader("Content-Disposition", "attachment;filename=" + new String(file.getName().getBytes()));
response.addHeader("Content-Length", "" + file.length());
OutputStream toClient = new BufferedOutputStream(response.getOutputStream());
response.setContentType("application/octet-stream");
toClient.write(buffer);
toClient.flush();
toClient.close();
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