文件上传问题（急！），下面是我从站点上找到的代码做了一些修改，但是没有成功，请各位大侠帮帮忙,帮我修改一下程序！(300分)

                                  DataInputStream in=null;
                                   FileOutputStream fileOut=null;
                                   String contentType = request.getContentType();
                                   System.out.println("get ContentType:"+contentType);
                                   in = new DataInputStream(request.getInputStream());
                                   int formDataLength = request.getContentLength();
                                   byte dataBytes[] = new byte[formDataLength];
                                   int bytesRead = 0;
                                   String file = new String(dataBytes);
                                   System.out.println("String File:"+file);
                                   int lastIndex = contentType.lastIndexOf("=");
                                   String boundary = contentType.substring(lastIndex+1, contentType.length());
                                   System.out.println("lastIndex:"+lastIndex+"String boundary"+boundary);
                                   String directory="";
                                   if (file.indexOf("name=/"Directory/"") > 0){directory = file.substring(file.indexOf("name=/"Directory/""));
                                   directory = directory.substring(directory.indexOf("/n")+1);
                                   directory = directory.substring(directory.indexOf("/n")+1);
                                   directory = directory.substring(0,directory.indexOf("/n")-1);
                                   
                                    String saveFile = file.substring( file.indexOf("filename=/"")+10);
                                    System.out.println("saveFile:"+saveFile);
                                    if(saveFile.endsWith(".html"))//如果上载的文件是HTML则可以上传
                                    {
                                    saveFile = saveFile.substring(0,saveFile.indexOf("/n"));
                                    saveFile = saveFile.substring(saveFile.lastIndexOf("//")+1,saveFile.indexOf("/""));
                                    String rootPath="c://";
                                    String fileName = new String(rootPath +directory+saveFile);
                                    System.out.println("fileName:"+fileName);
                                    fileOut = new FileOutputStream(fileName);
                                    //write the string to the file as a byte array 
                                    fileOut.write(file.getBytes(),0,file.length());
                                    fileOut.close();
                                     }