当我们在jsp中使用smartUpload实现文件的下载时:会出现response.getOutputstream()重复使用和中文文件不能识别的问题.

当在Jsp文件中要实现文件下载的时候,我建议大家采用下列方法: jsp 文件传递参数, 用单独的Servlet下载文件!

(1)先下载smartUpload.jar放到WEB-INF/lib目录下.

smartUpload下载地址:http://yifanwq.itpub.net/get/12099/10459-jspSmartUpload.jar

(2)在WEB-INF/classes目录下产生cn.com.servlet.Servlet

package cn.com.servlet;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.jspsmart.upload.SmartUpload;

public class SaveAs extends HttpServlet
{
private static final long serialVersionUID = 1L;

public SaveAs()
{
super();
}
public void destroy()
{
super.destroy();
}
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException
{

response.setContentType("text/html");
request.setCharacterEncoding("GBK");
// 新建一个SmartUpload对象
SmartUpload su = new SmartUpload();
String name=new String(request.getParameter("name").getBytes("ISO-8859-1"));
// 初始化
su.initialize(this.getServletConfig(),request,response);
su.setContentDisposition(null);//如果要实现单击在浏览器打开,注释该即可.
// 下载文件
try
{
System.out.print(name);
su.downloadFile("D:/"+name);//目录根据实际改变
}
catch(Exception e)
{
System.out.println(e);
}
}
}
(3)在web.xml中加入

This is the description of my J2EE component
This is the display name of my J2EE component
Imageoutput
cn.com.servlet.Imageoutput


This is the description of my J2EE component
This is the display name of my J2EE component
SaveAs
cn.com.servlet.SaveAs

(4)在jsp页面中建立如下连接即可:(页面的编码一定要是GBK)

<%@ page language="java" import="java.util.*" pageEncoding="GBK"%>

(5)打开页面测试.

总结:此种做法避免了在下载中文文件之前要改名的问题.在打开下载对话框时,会自己变成英文.方便用户的辩认.