这篇文章主要介绍了java组件commons-fileupload实现文件上传、下载、在线打开,具有一定的参考价值，感兴趣的小伙伴们可以参考一下
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 fileNames = new ArrayList(); 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 <i style="color:transparent">来源gaodai$ma#com搞$$代**码网</i>+ 1); else newFileName = 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
<title>Insert title here</title> <br> 文件一：<br> 文件二：<br> 上传者:<br> 日期:<br>
download.jsp
<title>Insert title here</title> <br> --------------直接下载------------ <br><% List fileNames = (List )request.getAttribute("fileNames"); for(String fileName : fileNames) { %> <input type="hidden" name="fileName" value=""/><input type="submit" value="下载:"/><br> --------------直接打开--------- <input type="hidden" name="fileName" value=""/><input type="submit" value="打开:"/></br>
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转载请注明原文链接：java组件commons-fileupload实现文件上传、下载、在线打开
转载请注明原文链接：java组件commons-fileupload实现文件上传、下载、在线打开
