关于上传与下载的实现方法总结.doc

现就JAVA中文件上传与下载的实现方法总结如下：一、上传方法1http方式：2）架包mons.fileupload.servlet.ServletFileUpload3）架包com.jspsmart.upload.SmartUpload4）架包jspupload5）传统fileinputstream,fileoutputstream方式6）struts框架支持2FTP方式：1）sun的架包2）架包.ftp.FTPClient 比较好用3）架包.ftp.FTPClient二、下载方法1http方式1）servlet+传统fileinputstream,fileoutputstream2）架包.ftp.FTPClient2FTP方式：1）servlet+架包.ftp.FTPClient 比较好用下面就架包.ftp.FTPClient实现文件上传与下载。代码如下：上传：JSP： 文件上传 文件位置： SERVLET：package com.test;import java.io.FileOutputStream;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class UploadServletA extends HttpServlet private static final long serialVersionUID = 1L;public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException tryrequest.setCharacterEncoding(utf-8);response.setCharacterEncoding(UTF-8); response.setContentType(text/html; charset=UTF-8); String myFile = request.getParameter(mfile); /获取页面提交的文件int indexOf = myFile.lastIndexOf(); /获取最后一个“/”所在的索引位String fileName = myFile.substring(indexOf); /获取文件上传的文件名/创建输出流把指定的文件写入WEB工程的upload目录下(需要在WebRoot目录下创建upload目录)。FileOutputStream fos = new FileOutputStream(d:upload + fileName);/创建输入流读取指定文件java.io.FileInputStream fis = new java.io.FileInputStream(new java.io.File(myFile);byte buffer = new byte256;int len = 0;while (len = fis.read(buffer) 0) /循环读取文件到输出流fos.write(buffer, 0, len); /使用输出流输出文件。fos.flush();fis.close();fos.close(); PrintWriter pw=response.getWriter(); pw.println(); pw.println(); pw.println(); pw.println(); pw.println(alert(上传成功！); pw.println(); pw.println(); pw.println(); pw.println();catch(Exception e)e.printStackTrace();PrintWriter pw=response.getWriter(); pw.println(); pw.println(); pw.println(); pw.println(); pw.println(alert(上传失败！); pw.println(); pw.println(); pw.println(); pw.println();public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException doPost(request, response);下载JSP: base href= 文件下载 !- 请点击文件名下载！ 中文.txt SERVLET:package com.test;import java.io.File;import java.io.IOException;import .URLEncoder;import javax.servlet.ServletException;import javax.servlet.ServletOutputStream;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import .ftp.FTPClient;import .ftp.FTPClientConfig;import .ftp.FTPFile;import .ftp.FTPReply;/* * * author kfzx-zhouy05 */public class FtpDownloadServlet extends HttpServlet private static final long serialVersionUID = 1L;public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException doPost(request, response);public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException request.setCharacterEncoding(utf-8);response.setCharacterEncoding(UTF-8); response.setContentType(text/html; charset=UTF-8);String path = upload;File f2 = new File(upload中文.txt);String filename2 = f2.getName();ServletOutputStream outputStream = response.getOutputStream();downFile(6, 21, zhouyun0243, zhouyun0243, path,filename2, outputStream, response);public void init() throws ServletException public static void downFile(String ip, int port, String username,String password, String remotePath, String fileName,ServletOutputStream outputStream, HttpServletResponse response) FTPClient ftp = new FTPClient();int count = 0;try int reply;ftp.connect(ip, port);/ 下面三行代码必须要，而且不能改变编码格式 ftp.setControlEncoding(UTF-8);FTPClientConfig conf = new FTPClientConfig(FTPClientConfig.SYST_NT);conf.setServerLanguageCode(zh);/ 如果采用默认端口，可以使用ftp.connect(url) 的方式直接连接FTP服务器 ftp.login(username, password);/ 登录 ftp.setFileType(FTPClient.BINARY_FILE_TYPE);reply = ftp.getReplyCode();if (FTPReply.isPositiveCompletion(reply) System.out.println(连接服务器失败);outputStream.println();outputStream.println();outputStream.println(alert(Connect server fail!);outputStream.println(document.location.href=http:/localhost:8080/struts2HibernateSpring/download.jsp);outputStream.println();outputStream.println();outputStream.close();ftp.disconnect();return;System.out.println(登陆成功。);ftp.changeWorkingDirectory(remotePath);/ 转移到FTP服务器目录 FTPFile fs = ftp.listFiles(); / 得到目录的相应文件列表 for (int i = 0; i fs.length; i+) FTPFile ff = fsi;if (ff.getName().equals(fileName) count+;String filename = fileName;/ 这个就就是弹出下载对话框的关键代码 response.setHeader(Content-disposition,attachment;filename=+ URLEncoder.encode(filename, UTF-8);/ 将文件保存到输出流outputStream中 ftp.retrieveFile(new String(ff.getName().getBytes(UTF-8),ISO-8859-1), outputStream);outputStream.flush();if (count = 1) /下载成功outputStream.close();ftp.logout();ftp.disconnect(); else /文件找不到outputStream.println();outputStream.println();outputStream.println(alert(File is not exist!);outputStream.println(document.location.href=http:/localhost:8080/struts2HibernateSpring/download.jsp);outputStream.println();outputStream.println();outputStream.close();ftp.logout();ftp.disconnect(); catch (Exception e) e.printStackTrace();try outputStream.println();outputStream.println();outp