jsp+servlet实现文件上传与下载源码

上传：

需要导入两个包：commons-fileupload-1.2.1.jar,commons-io-1.4.jar

import java.io.File;

import java.io.IOException;

import java.util.List;

import javax.servlet.ServletException;

import javax.servlet.mons.fileupload.FileItem;

import org.apache.commons.fileupload.disk.DiskFileItemFactory;

import org.apache.commons.fileupload.servlet.ServletFileUpload;

/**

* 上传附件

* @author new

*

*/

public class UploadAnnexServlet extends HttpServlet {

private static String path = "";

public void doGet(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

doPost(request, response);

}

/*

* post处理

* (non-Javadoc)

* @see javax.servlet..URLEncoder;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

/**

* 下载文件

* @author

*

*/

public class DownloadFilesServlet extends HttpServlet {

/**

*

*/

private static final long serialVersionUID = 8594448765428224944L;

public void doGet(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

doPost(request, response);

}

/*

* 处理请求

* (non-Javadoc)

* @see javax.servlet.http.HttpServlet#doPost(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)

*/

public void doPost(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

String name = request.getParameter("fileName");

System.out.print("dddddddddd:" + name);

// web绝对路径

String path = request.getSession().getServletContext().getRealPath("/");

String savePath = path + "upload";

// 设置为下载application/x-download

response.setContentType("application/x-download");

// 即将下载的文件在服务器上的绝对路径

String filenamedownload = savePath + "/" + name;

// 下载文件时显示的文件保存名称

String filenamedisplay = name;

// 中文编码转换

filenamedisplay = URLEncoder.encode(filenamedisplay, "UTF-8");

response.addHeader("Content-Disposition", "attachment;filename="

+ filenamedisplay);

try {

java.io.OutputStream os = response.getOutputStream();

java.io.FileInputStream fis = new java.io.FileInputStream(

filenamedownload);

byte[] b = new byte[1024];

int i = 0;

while ((i = fis.read(b)) > 0) {

os.write(b, 0, i);

}

fis.close();

os.flush();

os.close();

} catch (Exception e) {

}

}

}