实现文件的上载 _Web前端

实现文件的下载
下载文件。jsp

<%...@ page language="java" pageEncoding="utf-8"%>

<%...@ taglib uri="http://struts.apache.org/tags-bean" prefix="bean" %>
<%...@ taglib uri="http://struts.apache.org/tags-html" prefix="html" %>
<%...@ taglib uri="http://struts.apache.org/tags-logic" prefix="logic" %>
<%...@ taglib uri="http://struts.apache.org/tags-tiles" prefix="tiles" %>


<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html:html lang="true">
  <head>
    <html:base />
    
    <title>下载</title>

  </head>
  
  <body>
    <html:form action="download.do" method="post">
    
        <html:submit value="下载文件"></html:submit>
        
    </html:form>
  </body>
</html:html>

[u][/u]

action

package com.struts.action;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import com.struts.form.DownloadForm;

public class DownloadAction extends Action ...{
        public ActionForward execute(ActionMapping mapping, ActionForm form,
            HttpServletRequest request, HttpServletResponse response) throws UnsupportedEncodingException ...{
        DownloadForm d = (DownloadForm) form;
        
        
        
        InputStream is=null;
        OutputStream os=null;
        String path = "JAVA问题.doc";
        
                String newpath=URLEncoder.encode(path,"utf-8");
        
        byte[] b=new byte[1024];
        int i=0;
        
            try ...{
                
                is = new FileInputStream("d:/"+path);
                os = response.getOutputStream();
                /**//*在页面上弹出一个下在窗口*/
                response.setContentType("application/x-msdownload");
                /**//*设置报头信息，弹出窗口中显示的文件名    newpath*/
                response.setHeader("Content-Disposition", "Disposition; filename="+newpath);
                /**//*具体的输入输出流操作*/
                while((i=is.read(b))!=-1)...{
                    os.write(b, 0, i);
                    i=0;
                }
                os.flush();
            } catch (IOException e) ...{
                // TODO Auto-generated catch block
                e.printStackTrace();
            }finally...{
                try ...{
                    os.close();
                    is.close();
                } catch (IOException e) ...{
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
                
            }
            
            
            
            
        
        
        
        
        return null;
    }
}