最近做了一个文件上传、下载、与在线打开文件的功能，刚开始对文件上传的界面中含有其它表单（例如输入框、密码等）在上传的过程中遇到了许多问题，，下面我写了一个同时实现文件上传、下载、在线打开文件的测试程序。
首先请看效果图：
核心代码：
package com.jefry;import java.io.File;import java.io.FileInputStream;import java.io.IOException;import java.net.URL;import java.util.ArrayList;import java.util.Iterator;import java.util.List;import javax.servlet.ServletException;import javax.servlet.ServletOutputStream;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.apache.commons.fileupload.FileItem;import org.apache.commons.fileupload.disk.DiskFileItemFactory;import org.apache.commons.fileupload.servlet.ServletFileUpload;/** * Servlet implementation class FileUpload */public class FileUpload extends HttpServlet {private static final long serialVersionUID = 1L;private static final String fileDir = "F:/";/** * Default constructor. */public FileUpload() {}protected void doGet(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {String aFileName = request.getParameter("fileName"); String online = request.getParameter("online");FileInputStream in = null; ServletOutputStream out = null; boolean isOnLine = online != null ? true : false ;try {if(isOnLine){URL u = new URL("file:///"+fileDir + aFileName);response.setContentType(u.openConnection().getContentType());response.setHeader("Content-Disposition", "inline; filename="+aFileName);}else{response.setContentType("application/x-msdownload");response.setHeader("Content-Disposition", "attachment; filename=" + aFileName);}in = new FileInputStream(fileDir + aFileName);out = response.getOutputStream();out.flush();int aRead = 0;while ((aRead = in.read()) != -1 & in != null) {out.write(aRead);}out.flush();} catch (Throwable e) {e.printStackTrace();} finally {try {in.close();out.close();} catch (Throwable e) {e.printStackTrace();}}}protected void doPost(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {try {DiskFileItemFactory fileFactory = new DiskFileItemFactory();ServletFileUpload fu = new ServletFileUpload(fileFactory);List fileItems = fu.parseRequest(request);Iterator iter = fileItems.iterator();String uploader = null;String date = null;List<String> fileNames = new ArrayList<String>();while (iter.hasNext()) {FileItem item = (FileItem) iter.next();if (!item.isFormField()) { // 文件String oldFileName = item.getName();String newFileName = null;int delimiter = oldFileName.lastIndexOf("/");if (delimiter == -1)newFileName = oldFileName.substring(delimiter + 1);elsenewFileName = oldFileName;fileNames.add(newFileName);item.write(new File(fileDir + newFileName));} else { // 表单String fieldName = item.getFieldName();if ("uploader".equals(fieldName)) {uploader = item.getString();} else if ("date".equals(fieldName)) {date = item.getString();}}}request.setAttribute("fileNames",fileNames);request.getRequestDispatcher("download.jsp").forward(request, response);} catch (Exception e) {}}}
index.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"pageEncoding="UTF-8"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" ""><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Insert title here</title></head><body> <form action="FileUpload" method="post" enctype="multipart/form-data"> <br> 文件一：<input type="file" name="file1" /> <br>文件二：<input type="file" name="file2" /> <br> 上传者:<input type="text" name="uploader"/> <br> 日期:<input type="text" name="date"/> <br> <input type="submit" value="提交"/></form></body></html>
download.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"pageEncoding="UTF-8"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" ""><%@page import="java.util.List"%><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Insert title here</title></head><body> <br> ————–直接下载————<br><%List<String> fileNames = (List<String> )request.getAttribute("fileNames");for(String fileName : fileNames) {%><form action="FileUpload" method="get"><input type="hidden" name="fileName" value="<%=fileName %>" /><input type="submit" value="下载:<%=fileName %>" /></form><%}%><br>————–直接打开———<%for(String fileName : fileNames) {%><form action="FileUpload" method="get"><input type="hidden" name="fileName" value="<%=fileName %>" /><input type="hidden" name="online" value="yes" /><input type="submit" value="打开:<%=fileName %>" /></form><%}%></br></body></html>
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走走停停，不要害怕错过什么，
