用servlet寫的一個簡單的下載檔案功能
阿新 • • 發佈：2019-01-07
檔案目錄
download.html原始碼
DownloadServlet原始碼<span style="font-family:KaiTi_GB2312;font-size:18px;"><strong><!doctype html> <html> <head> <meta charset="gb2312"> <title>下載</title> </head> <body> <form action="" method="post"> mp3檔案 <a href="/DownloadFile/servlet/DownloadServlet?filename=shuizhonghua.mp3">點選下載</a><br/> text檔案 <a href="/DownloadFile/servlet/DownloadServlet?filename=mytest.txt">點選下載</a><br/> <br/> jpg檔案<a href="/DownloadFile/servlet/DownloadServlet?filename=kulou.jpg">點選下載</a><br/> <br/> </form> </body> </html> </strong></span>
<span style="font-family:KaiTi_GB2312;font-size:18px;"><strong>package com.ttf.download; import java.io.File; import java.io.FileInputStream; import java.io.IOException; import java.io.OutputStream; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; public class DownloadServlet extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html; charset = gb2312"); //out.println("hello"); //得到get方式提交的那個filename String fileName = request.getParameter("filename"); System.out.println(fileName); //表明是要下載檔案 response.setHeader("Content-Disposition", "attachment; filename="+fileName); //得到伺服器裡檔案的真是地址 String path = this.getServletContext().getRealPath("/file/"+fileName); //System.out.println(path); //一個二進位制輸入流 FileInputStream fis = new FileInputStream(new File(path)); byte[] b = new byte[1024]; int length; OutputStream out = response.getOutputStream(); while((length = fis.read(b)) > 0) { out.write(b, 0, length);//寫出 } out.flush(); out.close(); fis.close(); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request, response); } }</strong></span>
需要注意的是
<a href="/DownloadFile/servlet/DownloadServlet?filename=shuizhonghua.mp3">
模擬get方式提交的時候=號後面不能有空格！