数据流

DataOutputStream/DataInputStream

对“流”功能的一个扩展，可以更加方便的读取int，long，字符等类型数据

DataOutputStream

writeInt()/writeDouble()/writeUTF()

输出流

public class DosDemo {
    public static void main(String[] args) throws IOException {
        String file = "demo/dos.dat";
        DataOutputStream dos = new DataOutputStream(new FileOutputStream(file));
        dos.writeInt(10);
        dos.writeInt(-10);
        dos.writeLong(10l);
        dos.writeDouble(10.5);
        //采用utf-8编码写出
        dos.writeUTF("中国");
        //采用utf-16be编码写出
        dos.writeChars("中国");
        dos.close();
        IOUtil.printHex(file);
        
    }
}

 

输入流

public class DisDemo {
    public static void main(String[] args) throws IOException {
        String file = "demo/dos.dat";
        IOUtil.printHex(file);
        DataInputStream dis = new DataInputStream(new  FileInputStream(file));
        int i = dis.readInt();
        System.out.println(i);
        i = dis.readInt();
        System.out.println(i);
        long l = dis.readLong();
        System.out.println(l);
        double d = dis.readDouble();
        System.out.println(d);
        String s = dis.readUTF();
        System.out.println(s);
        
        dis.close();
    }
}