O'Reilly cos上传组件的使用(3/3) - 重命名上传后的文件 upload.html:
<form method="post" action="cos_rename.jsp" enctype="multipart/form-data"> 文件1:<input type="file" name="file1" /> 说明:<input type="text" name="file1_desc" /> <br /> 文件2:<input type="file" name="file2" /> 说明:<input type="text" name="file2_desc" /> <input type="submit" value="上传" /> </form>cos_rename.jsp:
<%@page contentType="text/html;charset=GBK"%> <%@page import="com.oreilly.servlet.MultipartRequest"%> <%@page import="java.io.File,javax.servlet.ServletContext"%> <%@page import="java.util.Enumeration,java.io.IOException"%> <%@page import="com.oreilly.servlet.multipart.FileRenamePolicy"%> <%@page import="java.text.SimpleDateFormat"%> O'Reilly cos上传组件的使用(3/3) - 重命名上传后的文件<br /> <%! /** *文件重命名策略类:当前文件名后加上时间和日期,防上重名 */ class MyFileRenamePolicy implements FileRenamePolicy{ public File rename(File file){ String newName = addInNameExt(file.getName() , getDateStr()); File result = new File(file.getParentFile() , newName); return result; } //返回一个当前时间的字符串表示 private String getDateStr(){ String pattern ="yyyy-MM-dd_HH-mm-ss_SSS"; SimpleDateFormat sdf = new SimpleDateFormat(pattern); String dateStr = sdf.format(new java.util.Date()); return dateStr; } //分离完整文件名的文件名和后缀,并在中间加入字符串后返回 private String addInNameExt(String fullName , String add){ String name = "";//文件名 String ext = ""; //后缀 char point = '.'; int index = fullName.lastIndexOf(point); if(index != -1){//如果有后缀 name = fullName.substring(0 , index); ext = fullName.substring(index + 1); } else{ name = fullName; } return name + "_" + add + point + ext; } } %> <% /*设置上传文件路径*/ ServletContext context = getServletContext(); String realPath = context.getRealPath("/"); String saveDir = realPath + "ch9\\fileupload\\upload\\"; //out.println(saveDir + "<br />");//输出实际路径 File dir = new File(saveDir); if(!dir.exists()) dir.mkdirs(); int maxPostSize = 1*1024*1024;//1MB String encoding = "GBK"; FileRenamePolicy rename = new MyFileRenamePolicy(); MultipartRequest multi = null; try{ multi = new MultipartRequest(request , saveDir , maxPostSize , encoding , rename); }catch(IOException e){ //上传大小超过maxPostSize就会出现IOException out.println(e.getMessage()); return; } //至此文件已经上传完成！ //以下为获取上传文件的信息，并不是必需的。 %> <br /><br /> <% //获取文件信息 Enumeration fileNames = multi.getFileNames(); while(fileNames.hasMoreElements()){ //指表单中的name值 String name = (String)fileNames.nextElement(); String original = multi.getOriginalFileName(name); if(original == null)continue; //只上传了一个文件时，另外的文件为null String sysname = multi.getFilesystemName(name); String type = multi.getContentType(name); out.println("Request Name:" + name +"<br />"); out.println("getOriginalFileName:" + original +"<br />"); out.println("getFilesystemName:" + saveDir + sysname +"<br />"); out.println("ContentType:" + type +"<br /><br />"); } %>