文件上传的源码
1.文件上传的jsp页面
<body><!--multipart/form-data:不对字符编码。在使用包含文件上传控件的表单时，必须使用该值。 --><!-- 所谓不对字符编码：要是是上传文件，就是不对文件内容进行编码 --> <center><form name="fileupload" action="FileAction" method="POST" enctype="multipart/form-data"> 文件上传：<input id="fileup1" name="fileup1" size="30" type="file" /> <p></p> 文件上传：<input id="fileup2" name="fileup2" size="30" type="file" /> <p></p> 文件上传：<input id="fileup3" name="fileup3" size="30" type="file" /> <p></p> <input type="submit" name="file_sub" id="file_sub" value="上传"/> </form> </center></body>
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2.web.xml文件配置
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<servlet> <description></description> <display-name>FileAction</display-name> <servlet-name>FileAction</servlet-name> <servlet-class>testFileup.FileAction</servlet-class> <init-param> <param-name>uploadfilepath</param-name> <param-value>upload</param-value> </init-param> </servlet> <servlet-mapping> <servlet-name>FileAction</servlet-name> <url-pattern>/FileAction</url-pattern> </servlet-mapping> <servlet> <description></description> <display-name>FileDownLoad</display-name> <servlet-name>FileDownLoad</servlet-name> <servlet-class>testFileup.FileDownLoad</servlet-class> <init-param> <param-name>uploadfilepath</param-name> <param-value>upload</param-value> </init-param> </servlet> <servlet-mapping> <servlet-name>FileDownLoad</servlet-name> <url-pattern>/FileDownLoad</url-pattern> </servlet-mapping>
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?3.文件上传部分（用的是org.apache.commons.fileupload）
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protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { //得到servlet配置中文件上传的路径String path=this.getInitParameter("uploadfilepath");path=this.getServletContext().getRealPath("/")+path;//获得文件存放的物理路径//path=request.getContextPath()+"\"+path;System.out.println("文件存放的物理路径："+path);//System.out.println("文件内容："+(String)request.getParameter("fileup1"));//是否上传成功boolean state=false;java.util.List<File> files=new java.util.ArrayList(); try{//创建一个基于磁盘文件的工厂DiskFileItemFactory factory=new DiskFileItemFactory();//setRepository：Sets the directory used to temporarily store files that are larger than the configured size threshold. factory.setRepository(new File(path));//setSizeThreshold:Sets the size threshold beyond which files are written directly to disk. factory.setSizeThreshold(10);//创建一个文件处理器ServletFileUpload upload=new ServletFileUpload(factory);//解析请求 //Processes an RFC 1867 compliant multipart/form-data stream. List items=upload.parseRequest(request);//处理文件上传项//Iterator iter=items.iterator();//while(iter.hasNext()){for(int i=0;i<items.size();i++){//FileItem:This class represents a file or form item that was received within a multipart/form-data POST request. //FileItem item=(FileItem)iter.next();FileItem item=(FileItem)items.get(i);if(item.isFormField()){//true if the instance represents a simple form field;//普通请求，可以接受请求中的其他参数}else{//文件上传请求//获得文件上传名String filename=item.getName();//filename在IE浏览器获得是具体的文件上传的物理地址，如C:\Documents and Settings\lilang\桌面\5单元-javaWEB开发-13\14.实战报表：jFreeChart，cewolf，iText，jExcel.doc//在firefox获得的是文件的名字，如：2.JSTL应用讲解.docSystem.out.println("文件全名："+filename);if(!filename.equals("")){int count=filename.lastIndexOf("\");if(count>0){filename=filename.substring(count);}else{filename="\"+filename;}File temf=new File(path+filename);System.out.println("保存的路径为："+temf.getAbsolutePath());//将文件写入服务器的目录上item.write(temf);files.add(temf);state=true;}}}}catch(Exception ep){ep.printStackTrace();}response.setContentType("text/html;charset=gbk");PrintWriter out=response.getWriter();if(state){while(files.size()>0){File file=files.remove(0);String filePath=file.getParentFile().getName()+"/"+file.getName();System.out.println("连接的文件路径："+filePath);//out.println("<br><a href=""+filePath+"">"+file.getName()+"</a>");//不以io输出流来下载文件，直接在浏览器打开String filename=file.getName();System.out.println("FileAction--文件名："+filename);out.println("<br><a href="FileDownLoad?filename="+filename+"">"+file.getName()+"</a>");}// end while}?4.文件下载部分
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protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {request.setCharacterEncoding("GB2312");String filename=request.getParameter("filename");filename=new String(filename.getBytes("ISO-8859-1"));System.out.println("获得的文件名："+filename);//filename=URLDecoder.decode(filename,"UTF-8");//System.out.println("文件名："+filename);String filePath=this.getServletContext().getRealPath("/")+this.getInitParameter("uploadfilepath")+"\"+filename;System.out.println("要下载的文件物理路径："+filePath); response.reset();//可以加也可以不加 response.setContentType("application/x-download"); String filedownload =filePath;//提供下载的文件的物理路径 String filedisplay = filename;//文件下载路径 filedisplay =URLEncoder.encode(filedisplay,"UTF-8"); response.addHeader("Content-Disposition","attachment;filename=" + filedisplay); ServletOutputStream outp = null; FileInputStream in = null; try { outp = response.getOutputStream(); in = new FileInputStream(filedownload); byte[] b = new byte[in.available()]; int t = 0; while((t= in.read(b)) > 0) { outp.write(b, 0, t); } outp.flush(); } catch(Exception e) { System.out.println("Error!"); e.printStackTrace(); } finally { if(in != null) { in.close(); in = null; } if(outp != null) { outp.close(); outp = null; } }}