jsp文件下载功能实现代码
更新时间:2017年10月18日 14:02:50 作者:洛阳融科聂晨
这篇文章主要为大家详细介绍了jsp实现文件下载功能的3种方法,具有一定的参考价值,感兴趣的小伙伴们可以参考一下
本文实例为大家分享了jsp实现文件下载功能的3种方法,供大家参考,具体内容如下
第一种、采用转发的方式:
package cn.jbit.download.servlet; import java.io.IOException; import javax.servlet.RequestDispatcher; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; public class DownloadServlet extends HttpServlet { private static final long serialVersionUID = 6765085208899952414L; public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doPost(request, response); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String filedownload = "/upload/1/10213.jpg";//即将下载的文件的相对路径 String filedisplay = "10213.jpg";//下载文件时显示的文件保存名称 response.setContentType("application/x-download");//设置为下载application/x-download //response.setContentType("application/x-msdownload");//设置为下载application/x-msdownload //response.setContentType("application/octet-stream");//设置为下载application/octet-stream response.addHeader("Content-Disposition", "attachment;filename=" + filedisplay); try { RequestDispatcher rd = request.getRequestDispatcher(filedownload); if(rd != null) { rd.forward(request,response); } response.flushBuffer(); } catch (Exception e) { e.printStackTrace(); } } }
二、通过输出流的方式:
package cn.jbit.download.servlet; import java.io.BufferedInputStream; import java.io.BufferedOutputStream; import java.io.File; import java.io.FileInputStream; import java.io.IOException; import java.io.InputStream; 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 DownloadOfIOServlet extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doPost(request, response); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String basePath = request.getSession().getServletContext().getRealPath("/upload"); String filedisplay = "helloworld.jpg"; String filedownload = basePath + File.separator + "helloworld.jpg"; response.setContentType("applicaiton/x-download"); response.addHeader("Content-Disposition", "attachment;filename="+filedisplay); InputStream is = null; OutputStream os = null; BufferedInputStream bis = null; BufferedOutputStream bos = null; is = new FileInputStream(new File(filedownload)); bis = new BufferedInputStream(is); os = response.getOutputStream(); bos = new BufferedOutputStream(os); byte[] b = new byte[1024]; int len = 0; while((len = bis.read(b)) != -1){ bos.write(b,0,len); } bis.close(); is.close(); bos.close(); os.close(); } }
第三种、通过超链接的方式(注意不推荐,因为会暴露下载文件的位置)
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持脚本之家。
相关文章
详解Spring Controller autowired Request变量
这篇文章主要介绍了详解Spring Controller autowired Request变量的相关资料,通过此文希望能帮助到大家,需要的朋友可以参考下2017-08-08jsp+ajax实现的局部刷新较验验证码(onblur事件触发较验)
这篇文章主要介绍了jsp+ajax实现的局部刷新较验验证码,基于onblur事件触发较验功能,以实例形式详细的分析了前台显示、图片生成及Ajax动态验证等详细技巧,具有一定参考借鉴价值,需要的朋友可以参考下2015-10-10详解Hibernate cascade级联属性的CascadeType的用法
这篇文章主要介绍了详解Hibernate cascade级联属性的CascadeType的用法的相关资料,需要的朋友可以参考下2017-02-02
最新评论