需求： servlet3.0以上，就是tomcat7.0以上,web.xml->web-app->version 3.0以上, 不需要引入其它的jar包
Servlet类需要添加注释@MultipartConfig, 必要， 否则request.getPart()会为null
@MultipartConfig public class FileServlet extends HttpServlet { public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { SimpleDateFormat format = new SimpleDateFormat("yyyyMMddHHmmssSSS"); //文件存放目录 String mypath = this.getClass().getClassLoader().getResource("/../../").getPath() + "upload"; File file = new File(mypath ); if(!file.exists()){ file.mkdir(); } String filename = format.format(new Date()); // multipart/form-data if (ServletFileUpload.isMultipartContent(request)) { Part part = request.getPart("ff"); if(part == null){ return; } String headerfNValue = part.getHeader("content-disposition"); if("".equals(headerfNValue.trim()){ return ; } //headerfNValue = [filename="xxxx.xxx"] String valueKey = "filename=\""; int s = headerfNValue.indexOf(valueKey ); if(s < 0){ return; } String originalfilename = headerfNValue.substring(s + valueKey.length(), headerfNValue.length()-1); ; String suffix = originalfilename.substring(originalfilename.lastIndexOf(".")); if(".jpg|.jpeg|.jpe|.jfif|.png|.gif|.bmp|.dib|.tif|.tiff".indexOf(suffix) < 0){ return; } filename += suffix; InputStream input = part.getInputStream(); file = new File(mypath + filename); if(!file.exists()){ file.createNewFile(); } FileOutputStream fos = new FileOutputStream(file); int size = 0; byte[] buffer = new byte[1024]; while ((size = input.read(buffer)) != -1) { fos.write(buffer, 0, size); } fos.close(); input.close(); } } }
getParts() 就是多个Part ,for出来就可以 关于 @MultipartConfig 注释： @MultipartConfig(location = "/upload", maxFileSize = 1024 * 1024 * 50) 设置了location 就是文件的保存路径 , 确认Part的filename不为空后，可以直接写入, 可以省去后面的文件流操作 ...... filename += suffix; part.write(filename); 前端页面： <form action="" method ="post" enctype="multipart/form-data"> <input type="file" name="ff" /> <input type="submit" value="go" /> </form>
