引用:http://bbs.csdn.net/topics/390290685?page=1
Java code?
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public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { request.setCharacterEncoding( "utf-8" ); final long MAX_SIZE = 300 * 1024 * 1024 ; // 设置上传文件最大值 //允许上传文件格式的列表 final String[] allowedExt = new String[]{ "jpg" , "jpeg" , "gif" , "txt" , "doc" , "mp3" , "wma" , "m4a" , "rar" , "zip" }; response.setContentType( "text/html" ); // 设置字符编码为UTF-8, 统一编码,处理出现乱码问题 response.setCharacterEncoding( "UTF-8" ); // 实例化一个硬盘文件工厂,用来配置上传组件ServletFileUpload DiskFileItemFactory dfif = new DiskFileItemFactory(); dfif.setSizeThreshold( 4096 ); // 设置上传文件时用于临时存放文件的内存大小,这里是4K.多于的部分将临时存在硬盘 dfif.setRepository( new File(request.getRealPath( "/" )+ "ImagesUploadTemp" )); // 用以上工厂实例化上传组件 ServletFileUpload sfu = new ServletFileUpload(dfif); //设置最大上传大小 sfu.setSizeMax(MAX_SIZE); PrintWriter out = response.getWriter(); //从request得到所有上传域的列表 List fileList = null ; try { fileList = sfu.parseRequest(request); } catch (FileUploadException e){ // 处理文件尺寸过大异常 if (e instanceof SizeLimitExceededException){ out.println( "文件尺寸超过规定大小:" + MAX_SIZE + "字节<p/>" ); out.println( "<a href="#" >返回</a>" ); return ; } e.printStackTrace(); } //没有文件上传 if (fileList == null || fileList.size() == 0 ){ out.println( "请选择上传文件<p/>" ); out.println( "<a href="#" >返回</a>" ); return ; } //得到所有上传的文件 Iterator fileItr = fileList.iterator(); //循环处理所有文件 while (fileItr.hasNext()){ FileItem fileItem = null ; String path = null ; long size = 0 ; //得到当前文件 fileItem = (FileItem) fileItr.next(); // 忽略简单form字段而不是上传域的文件域(<input type="text" />等) if (fileItem == null || fileItem.isFormField()) { continue ; } // 得到文件的完整路径 path = fileItem.getName(); // 得到文件的大小 size = fileItem.getSize(); if ( "" .equals(path) || size == 0 ) { out.println( "请选择上传文件<p />" ); out.println( "<a href="#" >返回</a>" ); return ; } // 得到去除路径的文件名 String t_name = path.substring(path.lastIndexOf( "//" ) + 1 ); // 得到文件的扩展名(无扩展名时将得到全名) String t_ext = t_name.substring(t_name.lastIndexOf( "." ) + 1 ); // 拒绝接受规定文件格式之外的文件类型 int allowFlag = 0 ; int allowedExtCount = allowedExt.length; for (; allowFlag < allowedExtCount; allowFlag++) { if (allowedExt[allowFlag].equals(t_ext)) break ; } if (allowFlag == allowedExtCount) { out.println( "请上传以下类型的文件<p />" ); for (allowFlag = 0 ; allowFlag < allowedExtCount; allowFlag++) out.println( "*." + allowedExt[allowFlag] + " " ); out.println( "<p /><a href="#" >返回</a>" ); return ; } //long now = System.currentTimeMillis(); // 根据系统时间生成上传后保存的文件名 //String prefix = String.valueOf(now); // 保存的最终文件完整路径,保存在web根目录下的ImagesUploaded目录下 // String u_name = request.getRealPath("/") + "ImagesUploaded/" // + prefix + "." + t_ext; String filename = t_name; System.out.println(t_name); try { // 保存文件到C://upload目录下 fileItem.write( new File( "C://upload//" + filename)); //System.out.println(filename); out.println( "文件上传成功. 已保存为: " + filename + " 文件大小: " + size + "字节<p />" ); out.println( "<a href="#" >继续上传</a>" ); } catch (Exception e) { e.printStackTrace(); } } } |