用JSP实现文件(excel和text)的下载的代码？

Question

用JSP实现文件(excel和text)的下载的代码？详细的......

Answer 1

//-------下载Excel------------  
File file=null;
        InputStream ins=null;
        String fileName=null;
        int fileSize=0;         
file=new File(path+"\\Excel\\"+excelName);
        ins=new FileInputStream(file);
        fileName=file.getName();
        fileName=new String(fileName.getBytes(),"iso-8859-1");
        fileSize=(int)file.length();
        
        response.setContentType("application/x-msdownload");
        String str = "attachment; filename="+fileName;   //文件名
        response.setHeader("Content-Disposition", str);        
        response.setContentLength(fileSize);//大小
        
        ServletOutputStream sos=response.getOutputStream();
        byte[] data = new byte[2048];
        int len = 0;
        while((len=ins.read(data)) >0)
        {
            sos.write(data,0,len); 
        }        
        ins.close(); 
        sos.close();
        file.delete();        放到servlet中 ..下载excel

Answer 2

try
        {
            //这里你可以做些其他的事情
          response.setContentType("application/vnd.ms-excel");           //  Word  对应的就是 application/msword         
          response.setHeader("Content-disposition","attachment; filename=abc.xls");
             //这里的abc是保存时的默认文件名
          BufferedInputStream bis = null;
          BufferedOutputStream bos = null;
          try {
                // bis = new BufferedInputStream(new FileInputStream(getServletContext().getRealPath("" + filename)));
              bis = new BufferedInputStream(new FileInputStream("D:\\23.xls"));
              bos = new BufferedOutputStream(response.getOutputStream());                 byte[] buff = new byte[2048];
                 int bytesRead;                 while(-1 != (bytesRead = bis.read(buff, 0, buff.length))) {
                     bos.write(buff,0,bytesRead);
                 }             } catch(final IOException e) {
                 System.out.println ( "出现IOException." + e );
             } finally {
                 if (bis != null)
                     bis.close();
                 if (bos != null)
                     bos.close();
             }
             return;        }
        catch (Exception e)
        {
            System.out.println(e);
        }

Answer 3

１　下载txt文件　
代码如下：
OutputStream o=response.getOutputStream();
  byte b[]=new byte[500];
  File fileLoad=new File("e:/test.txt");
   response.setContentType("application/octet-stream");
  response.setHeader("content-disposition","attachment; filename=text.txt");
  long fileLength=fileLoad.length();
  String length1=String.valueOf(fileLength);
  response.setHeader("Content_Length",length1);
  FileInputStream in=new FileInputStream(fileLoad);
  int n;
  while((n=in.read(b))!=-1){
   o.write(b,0,n);
  }  
  in.close();
  out.clear();
  out = pageContext.pushBody();
2  下载excel文件　
<%@page language="java" import="java.sql.*,java.io.*,java.net.URLEncoder,java.util.*" pageEncoding="gb2312"%>
<% 
  OutputStream o=response.getOutputStream();
  byte b[]=new byte[1024];
  File fileLoad=new File("e:/dzl.xls");
  response.reset();
  response.setContentType("application/vnd.ms-excel");
  response.setHeader("content-disposition","attachment; filename=text.xls");
  long fileLength=fileLoad.length();
  String length1=String.valueOf(fileLength);
  response.setHeader("Content_Length",length1);
  FileInputStream in=new FileInputStream(fileLoad);
  int n;
  while((n=in.read(b))!=-1){
   o.write(b,0,n);
  }  
  in.close();
  out.clear();
  out = pageContext.pushBody(); 
%>
在web.xml下配置：
<?xml version="1.0" encoding="ISO-8859-1"?>
<web-app xmlns="http://java.sun.com/xml/ns/j2ee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"
version="2.4">
//配置excel下载    
   <mime-mapping>   
  <extension>xls</extension>   
  <mime-type>application/vnd.ms-excel</mime-type>   
  </mime-mapping>   
  //配置word下载
   <mime-mapping>
    <extension>doc</extension>
    <mime-type>application/vnd.ms-word</mime-type>
   </mime-mapping>
</web-app>