利用struts上传头像到文件夹

                fileFileName = new Date().getTime() + fileFileName;
		ServletContext servletContext = ServletActionContext.getServletContext();
		String path = servletContext.getRealPath("/");// 文件最终要上传到的路径
		System.out.println("絕對路徑"+path+"headphoto\"+fileFileName); 
		FileOutputStream out = new FileOutputStream(path+"headphoto\"+fileFileName);
		FileInputStream in = new FileInputStream(file);
		byte[] buffer = new byte[1024];
		int len = 0;
		while ((len = in.read(buffer)) != -1) {
			out.write(buffer, 0, len);
		}
		out.close();
　　　　　　　　　in.clos();

　　1.路径：servletContext.getRealPath("/")+文件夹名+文件名 newy一个fileoutputstream;

　　2.写入文件：是从struts控件里面获取的文件new一个fileinputstream；

　　3.标准写法：

byte[] buffer = new byte[1024];
		int len = 0;
		while ((len = in.read(buffer)) != -1) {
			out.write(buffer, 0, len);
		}