实体准备

public class Arc implements Serializable{
    private Node src;
    private Node dest;
    ......
}

读取

RandomAccessFile randomAccessFile = new RandomAccessFile(fileNodePath, "r");

public Arc read(RandomAccessFile dataInputStream) {
        Arc arc = null;

        ObjectInputStream obj = null;
        ByteArrayInputStream byt = null;
        try {
            Integer length = dataInputStream.readInt();
            byte[] bytes = new byte[length];
            dataInputStream.read(bytes);
            byt = new ByteArrayInputStream(bytes);
            obj = new ObjectInputStream(byt);
            arc = (Arc) obj.readObject();
        } catch (IOException | ClassNotFoundException e) {
            e.printStackTrace();
        } finally {
            try {
                obj.close();
                byt.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return arc;
    }

写入

RandomAccessFile randomAccessFile = new RandomAccessFile(fileNodePath, "rw");

public void write(RandomAccessFile dataOutputStream) {
        ObjectOutputStream obj = null;
        ByteArrayOutputStream byt = null;
        try {
            byt = new ByteArrayOutputStream();
            obj = new ObjectOutputStream(byt);
            obj.writeObject(this);
            dataOutputStream.writeInt(byt.toByteArray().length);
            dataOutputStream.write(byt.toByteArray());
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                obj.close();
                byt.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

    }