頁面:
<a href="servlet/Download" >下載a>
java代碼:
public class Download extends HttpServlet { public Download() { super(); } public void destroy() { super.destroy(); // Just puts "destroy" string in log // Put your code here } public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { this.doPost(request, response); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String path = "D:/upload/哈哈哈.txt"; try { // path是指欲下載的文件的路徑。 File file = new File(path); // 獲得文件名。 String filename = file.getName(); // 獲得文件的后綴名。 String ext = filename.substring(filename.lastIndexOf(".") + 1).toUpperCase(); // 以流的情勢下載文件。 InputStream fis = new BufferedInputStream(new FileInputStream(path)); byte[] buffer = new byte[fis.available()]; fis.read(buffer); fis.close(); // 清空response response.reset(); // 設置response的Header response.addHeader("Content-Disposition", "attachment;filename=" + new String(filename.getBytes("gb2312"),"ISO8859⑴")); response.addHeader("Content-Length", "" + file.length()); OutputStream toClient = new BufferedOutputStream(response.getOutputStream()); response.setContentType("application/octet-stream"); toClient.write(buffer); toClient.flush(); toClient.close(); } catch (IOException ex) { ex.printStackTrace(); } } public void init() throws ServletException { // Put your code here } }
這類下載方式只能下載在程序本地磁盤中的文件。 如果想下載服務器中的(比如通過上傳放置在tomcat服務器下)文件,請看我另外一篇博客:
使用jspsmartupload上傳下載
上一篇 Web開發人員常犯的10個錯誤