jsp文件下载功能实现代码

概述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

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,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,response);   }      public voID doPost(httpServletRequest request,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,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编程小技巧。

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