excel无法通过jsp打开下载的文件

问题描述：

这是在浏览器上下载excel文件的代码，但是当我打开它时，Excel会抛出错误Excel无法打开文件Location.xlsx，因为文件格式或文件扩展名无效验证文件是否没有损坏，文件扩展名匹配文件的格式，但是当我只是创建这个文件打开只有这个错误即将到来，当我执行下载操作，我正在使用poi jar的Excel文件创建...？

this is the code for download excel file on browser but when i open it excel throw a error "Excel can not open the file 'Location.xlsx' because the file format or file extension is not valid. verify that the file has not been corrupted and that the file extension matches the format of the file" but when i simply create this file its opening only this error is coming when i perform download operation and i am using poi jar for excel file creation...???

<html>

    <body>
        <%
   LocationDownload.downloadLocation();
%>
<% 
  String filename = "Location.xlsx";   
  String filepath = "C:\\Users\\dsingh\\GlassFish_Server\\glassfish\\domains\\domain1\\config\\";   
  response.setContentType("application/vnd.ms-excel");   
  response.setHeader("Content-Disposition","attachment; filename=" + filename);   

  java.io.FileInputStream fileInputStream=new java.io.FileInputStream(filepath + filename);  

  int i;   
  while ((i=fileInputStream.read()) != -1) {  
    out.write(i);   
   }   
  fileInputStream.close();   
%>   

    </body>
</html>

答

首先将您的文件下载编码移到Servlet（don'在JSP文件内部进行）..

First move your File Download coding to Servlet (don't do inside JSP file)..

检查这个代码将会帮助..它正在与我一起工作，因为你需要相同的目的。

Check this code it will help.. It is working with me for the same purpose as u require.

package edu.zukrah.servlets;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;

import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet implementation class FileDownload
 */
@WebServlet("/FileDownload")
public class FileDownload extends HttpServlet {
    private static final long serialVersionUID = 1L;

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
         File f = new File ("E:/pdftest/" + request.getParameter("file") );
         //set the content type(can be excel/word/powerpoint etc..)

         String type = request.getParameter("type");
         response.setContentType (type);

         //set the header and also the Name by which user will be prompted to save
         response.setHeader ("Content-Disposition", "attachment; filename=\""+request.getParameter("file")+"\"");

         //get the file name
         String name = f.getName().substring(f.getName().lastIndexOf("/") + 1, f.getName().length());

         //OPen an input stream to the file and post the file contents thru the 
         //servlet output stream to the client m/c
          InputStream in = new FileInputStream(f);

        try{
              ServletOutputStream outs = response.getOutputStream();

              int bytesRead;
              byte[] buf = new byte[4 * 1024]; // 4K buffer

              try {
                   while ((bytesRead = in.read(buf)) != -1){ 
                       outs.write(buf, 0, bytesRead);
                   }

              } catch (IOException ioe) {
                  ioe.printStackTrace(System.out);
              }

              System.out.printf(name + ",  %.2f kbs downloaded, %.2f mbs downloaded   \n", 
                                (f.length()/((double)(1024))), 
                                (f.length()/((double)(1024*1024))));

              outs.flush();
              outs.close();
              in.close(); 
        }catch(Exception e){
            e.printStackTrace();
        }
    }


}

excel无法通过jsp打开下载的文件

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