首先说下使用的框架和插件：
struts1.3 jQuery1.3 ajaxupload.3.2.js(一个JQuery的插件，实现Ajax上传的效果)
COS(O’relly的一个性能很棒的上传组件)
jsp页面：
<%@ page language="java" pageEncoding="UTF-8"%> <%@ include file="../../common/taglibs.jsp" %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <script type="text/javascript" src="${basePath }/script/jquery.js"></script> <script type="text/javascript" src="${basePath }/script/ajaxupload.3.2.js"></script> <title>Ajax文件上传示例</title> <style type="text/css"> #loading,ol{ font-size:14px; display:none; color:orange; display:none; } ol{ display:block; } </style> <script type="text/javascript"> $(function(){ new AjaxUpload("#fileButton",{ action:"${basePath}/file.do?method=upload", autoSubmit:true, name:"myfile", onSubmit:function(file, extension){ if (extension && /^(pdf|jpg|png|jpeg|gif)$/.test(extension)) { $("#loading").html('<img src="${basePath}/images/loading.gif">'); $("#loading").show(); $("#fileButton").attr("disabled","disabled"); } else { $("#loading").html("你所选择的文件不受系统支持"); $("#loading").show(); return false; } }, onComplete:function(file, extension){ $("#loading").html("文件上传成功"); $("#loading").show(); $("#fileButton").removeAttr("disabled"); } }); new Ajax_upload('#button3', { action: '${basePath}/file.do?method=upload', name: 'myfile', autoSubmit:true, onComplete : function(file, extension){ $('<li></li>').appendTo($('.files')).text(file); } }); }); </script> </head> <body> <input type="button" value="请选择您的照片" id="fileButton"/> <div id="loading"><img src="${basePath}/images/loading.gif"></div> <hr/> <form action="#" method="post"> <input id="button3" type="file" /> <p>上传成功的文件有:</p> <ol class="files"></ol> <p> <input class="submit" type="submit" value="表单提交"/> </p> </form> </body> </html> StrutsAction代码：
package com.kay.crm.web; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.apache.struts.action.ActionForm; import org.apache.struts.action.ActionForward; import org.apache.struts.action.ActionMapping; import org.apache.struts.actions.DispatchAction; import org.springframework.stereotype.Controller; import com.kay.common.util.CosUtil; @Controller("/file") public class FileUploadAction extends DispatchAction { public ActionForward upload(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws Exception { String fileName = CosUtil.upload(request); System.out.println(fileName); return null; } }
Cos的工具类：
package com.kay.common.util; import java.io.File; import java.io.IOException; import java.util.Enumeration; import javax.servlet.http.HttpServletRequest; import com.oreilly.servlet.MultipartRequest; public class CosUtil { @SuppressWarnings({ "deprecation", "unchecked" }) public static String upload(HttpServletRequest request) throws IOException { //存绝对路径 //String filePath = "C://upload"; //存相对路径 String filePath = request.getRealPath("/")+"upload"; File uploadPath = new File(filePath); //检查文件夹是否存在 不存在 创建一个 if(!uploadPath.exists()) { uploadPath.mkdir(); } //文件最大容量 5M int fileMaxSize = 5*1024*1024; //文件名 String fileName = null; //上传文件数 int fileCount = 0; //重命名策略 RandomFileRenamePolicy rfrp=new RandomFileRenamePolicy(); //上传文件 MultipartRequest mulit = new MultipartRequest(request,filePath,fileMaxSize,"UTF-8",rfrp); String userName = mulit.getParameter("userName"); System.out.println(userName); Enumeration filesname = mulit.getFileNames(); while(filesname.hasMoreElements()){ String name = (String)filesname.nextElement(); fileName = mulit.getFilesystemName(name); String contentType = mulit.getContentType(name); if(fileName!=null){ fileCount++; } System.out.println("文件名：" + fileName); System.out.println("文件类型： " + contentType); } System.out.println("共上传" + fileCount + "个文件！"); return fileName; } }
Cos上传组件用到的重命名策略类：
package com.kay.common.util; import java.io.File; import java.util.Date; import com.oreilly.servlet.multipart.FileRenamePolicy; public class RandomFileRenamePolicy implements FileRenamePolicy { public File rename(File file) { String body=""; String ext=""; Date date = new Date(); int pot=file.getName().lastIndexOf("."); if(pot!=-1){ body= date.getTime() +""; ext=file.getName().substring(pot); }else{ body=(new Date()).getTime()+""; ext=""; } String newName=body+ext; file=new File(file.getParent(),newName); return file; } }