使用commons-fileupload多文件上传例子
准备: commons-fileupload-1.2.1.jar和commons-io-1.4.jarpublic void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {//System.out.println(request.getParameter("test"));request.setCharacterEncoding("utf-8");// 设置字符编码为UTF-8, 统一编码，处理出现乱码问题//response.setContentType("text/html;charset=utf-8");//response.setCharacterEncoding("utf-8");boolean isMultipart = ServletFileUpload.isMultipartContent(request);//检查是否是一个文件上传请求if(isMultipart){// 实例化一个硬盘文件工厂,用来配置上传组件ServletFileUpload DiskFileItemFactory factory = new DiskFileItemFactory();// 设置上传文件时用于临时存放文件的内存大小,这里是2K.多于的部分将临时存在硬盘factory.setSizeThreshold(1024*2);// 设置存放临时文件的目录,web根目录下的ImagesUploadTemp目录factory.setRepository(new File("c:\\file"));//临时文件//以上两项可通过DiskFileItemFactory构参来创建//DiskFileItemFactory factory = new DiskFileItemFactory(yourMaxMemorySize, yourTempDirectory);// 用上面的工厂实例化上传组件，ServletFileUpload upload = new ServletFileUpload(factory);//upload.setFileItemFactory(factory);//如果ServletFileUpload实例中不设置上面的Factory则报java.lang.NullPointerException: No FileItemFactory has been set.// 设置最大上传大小 10Mupload.setSizeMax(1024*1024*10);String name = "";try {Listitems = upload.parseRequest(request); // 得到所有FileItem Iterator iter = items.iterator();// 循环处理所有文件while (iter.hasNext()) { FileItem item = (FileItem) iter.next(); if (!item.isFormField()) {//判断是否是表单元素(<input type="text" />单选，多选等) name = item.getName();// 得到文件的名称 if(name==null || "".equals(name.trim())){// 未选择上传文件 continue; } long size = item.getSize();//文件长度 File file = new File("c:\\file\\"+name);if(file.exists()){file.delete();} item.write(file); }else{ //<input name="test" size="40" type="text"> //String value = item.getString();//表单元素的值,用在非文件上传域中 //String fieldName = item.getFieldName();////表单元素的名称，用在非文件上传域中 **test** System.out.println(item.getFieldName()+""+new String(item.getString().getBytes("ISO-8859-1"),"utf-8"));//处理中文问题 }}} catch (FileUploadException e) {// 处理文件尺寸过大异常e.printStackTrace();} catch (Exception e) {// 处理文件写入时的异常System.out.println("Write Error: "+name);e.printStackTrace();}}request.getRequestDispatcher("/jsp/su.jsp").forward(request, response);}
使用流读取：
//API中提供的按流的形式读取void uploadByStream(HttpServletRequest request) throws FileUploadException, IOException{boolean isMultipart = ServletFileUpload.isMultipartContent(request);String name = "";if (isMultipart) {ServletFileUpload upload = new ServletFileUpload();upload.setSizeMax(1024*1024*10);FileItemIterator fileItemIterator = upload.getItemIterator(request);while(fileItemIterator.hasNext()){FileItemStream stream = fileItemIterator.next();if(!stream.isFormField()){name = stream.getName();// 得到文件的名称 if(name==null || "".equals(name.trim())){ continue; } File file = new File("c:\\file\\"+name);if(file.exists()){file.delete();}InputStream is = stream.openStream();ByteArrayOutputStream bStream = new ByteArrayOutputStream();long size = Streams.copy(is,bStream,true);OutputStream op = new FileOutputStream(file);bStream.writeTo(op);}else{InputStream is = stream.openStream();InputStreamReader isr = new InputStreamReader(is,"utf-8");BufferedReader br = new BufferedReader(isr);char b[] = new char;int len = 0;StringBuffer sb = new StringBuffer();String line = null;while((line=br.readLine())!=null){sb.append(line);}//while((len=isr.read(b))!=-1){//System.out.println("len= "+len);//sb.append(new String(b,0,len));//}System.out.println(stream.getFieldName()+""+sb.toString());}}}}
HTML：
<FORM action="/servlet/FileUpServlet" method="post" enctype="multipart/form-data"> <table border="1" width="450" cellpadding="4" cellspacing="2" bordercolor="#9BD7FF"> <tr><td width="100%" colspan="2"> 文件1：<input name="x" size="40" type="file"> </td></tr> <tr><td width="100%" colspan="2"> 文件2：<input name="y" size="40" type="file"> </td></tr> <tr><td width="100%" colspan="2"> 文件3：<input name="z" size="40" type="file"> </td></tr> <tr><td width="100%" colspan="2"> 文件4：<input name="a" size="40" type="file"> </td></tr> <tr><td width="100%" colspan="2"> 文件5：<input name="b" size="40" type="file"> </td></tr> <tr><td width="100%" colspan="2"> 文件6：<input name="test" size="40" type="text"> </td></tr> </table> <br/><br/> <table> <tr><td align="center"><input name="upload" type="submit" value="开始上传"/></td></tr> </table> </FORM>
页:
[1]