import java.io.*; /** * 阅读流的原始字节数据,如图像数据。 * */ public class FileInputDemo { public static void main(String args[]) { if (args.length == 1) { try { FileInputStream fstream = new FileInputStream(args[0]); DataInputStream in = new DataInputStream(fstream); while (in.available() != 0) { System.out.println(String.valueOf(in.readDouble()));// in的readDouble()方法 } in.close(); } catch (Exception e) { System.out.println("文件输入错误"); } } else System.out.println("参数无效"); } }