jsp文件的上传与下载

需要导入相应的架包： 

创建的上传页面：uploadForm.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>



  
    
    
    
	
	
	    
	
	
	
  
  
  
    文件上传
    

    

        请选择一个文件进行上传：
      
      
    
    ${msg}
  

Servlet：Upload.java：

package com.Servlet;

import java.io.IOException;

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

import com.jspsmart.upload.File;
import com.jspsmart.upload.SmartUpload;
import com.jspsmart.upload.SmartUploadException;
@WebServlet("/UploadServlet")
public class Upload extends HttpServlet {
	@Override
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		//SmartUpload负责文件的上传
		SmartUpload smartUpload=new SmartUpload();
		//初始化
		ServletConfig config=this.getServletConfig();
		smartUpload.initialize(config,request,response);
		try{
			//上传文件
			smartUpload.upload();
			//得到上传文件对象
			File smartFile=smartUpload.getFiles().getFile(0);
			//保存文件，保存到D盘，smartUpload.SAVE_PHYSICAL：表示按照硬盘上的物理路径保存
			smartFile.saveAs("D:/"+smartFile.getFileName(),smartUpload.SAVE_PHYSICAL);
			
		}catch(SmartUploadException e){
			e.printStackTrace();
		}
		//下面代码可以不回传到上个页面，可以新建一个jsp页面显示成功结果
		
		String msg="Upload Sucess!";
		request.setAttribute("msg", msg);
		RequestDispatcher rd=request.getRequestDispatcher("/uploadForm.jsp");
		rd.forward(request, response);
	}

}

结果：

选择文件

 点击上传：

查看D盘：

 文件下载页面：

uploadForm.jsp：

将连接目标执行下载的文件，例如：在本项目中/image下有一张图片：414.jpeg

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>



  
    
    
    
    
	
	
	    
	
	
	

  
  
  
    文件下载：
    

    下载
  

点击下载连接之后出现下载框，需要将连接目标定位到另外一个jsp：down.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>



  
    
    
    
    
	
	
	    
	
	
	

  
  
  
    <%
       String filename=request.getParameter("File");
       //告诉客户出现下载框，并指定下载框中的文件名
       response.setHeader("Content-Disposition","attachment;filename="+filename);
       //指定文件类型
       response.setContentType("image/jpeg");
       //指定文件
       RequestDispatcher rd=request.getRequestDispatcher("/image/"+filename);
       
       rd.forward(request, response);
       
     %>
  

点击下载： 

 点击保存，选择路径：