common-fileupload上传文件

使用common-fileupload上传文件比较简单，先去 http://commons.apache.org/fileupload/ 下载好相关的jar包，然后准备好上传的页面文件，主要的是一个form,如下：

 

  
  <form action="uploadFile.do" method="post" enctype="multipart/form-data" name="fileUploadForm">   

...

  </form>

 

其中最主要的就是form的enctype属性一定得是"multipart/form-data"。然后就是接受文件的Java类了，这里以Struts的Action为例。

public ActionForward uploadFile(ActionMapping mapping, ActionForm form,HttpServletRequest request, HttpServletResponse response) throws Exception { ActionForward forward = null; HttpSession session = request.getSession(); PrintWriter out = response.getWriter(); //设置上传文件的大小限制 final long MAX_SIZE = 200 * 1024 * 1024; //设置上传文件在服务器的目录 String fileFolder = "../webapps/fileupload"; String fileName=""; String contentType=""; String fileSize=""; //从页面传过来的参数值的数组（File除外） String[] paraArray=new String[3]; int paraNo=0; //判断该请求是否是文件上传的请求 boolean isMultipart = ServletFileUpload.isMultipartContent(request); if (isMultipart) { DiskFileItemFactory factory = new DiskFileItemFactory(); //设置上传文件时用于临时存放文件的内存大小 factory.setSizeThreshold(100 * 1024); //设置存放临时文件的目录，这个目录需要事先建立好 factory.setRepository(new File(fileFolder + "/temp")); ServletFileUpload upload = new ServletFileUpload(factory); upload.setSizeMax(MAX_SIZE); upload.setHeaderEncoding("UTF-8"); try { List filelist = upload.parseRequest(request); for (Iterator it = filelist.iterator(); it.hasNext();) { FileItem item = it.next(); //判断是form表单域还是上传文件file域 if (item.isFormField()) { //处理form表单域 String name = new String(item.getFieldName().getBytes("ISO-8859-1"),"UTF-8"); String value =new String(item.getString().getBytes("ISO-8859-1"),"UTF-8"); paraArray[paraNo]=value; paraNo++; } else { //处理fileUpload if(item.getSize()>=MAX_SIZE) { forward=mapping.findForward("uploadFile"); return forward; }else { int tempSize=(int) (item.getSize()/1024); if(tempSize*1024 { fileSize=tempSize+1+""; }else { fileSize=tempSize+""; } String fieldName = item.getFieldName(); //取得文件类型 contentType = item.getContentType(); //文件的全路径 fileName =item.getName(); //得到去除路径的文件名 int index = fileName.lastIndexOf("//"); fileName = fileName.substring(index + 1); //构建一个文件 File uploadFile = new File(fileFolder, fileName); //保存文件 item.write(uploadFile); } } } out.print("UploadFile Successfully !"); //FileService.saveFile(paraArray); } catch (FileUploadException e) { out.print("File is too large,maxsize is 200MB !"); } catch (Exception e) { logger.debug(e); } } out.flush(); out.close(); return forward; } 

代码是在英文操作系统下运行的，所以需要将传过来的参数转码。