标签: bufferunderflowexception

我试图在Scala中编写一些脚本来处理一些日志文件:

scala> import io.Source
import io.Source

scala> import java.io.File
import java.io.File

scala> val f = new File(".")
f: java.io.File = .

scala> for (l <- f.listFiles) {
 |   val src = Source.fromFile(l).getLines
 |   println( (0 /: src) { (i, line) => i + 1 } )
 | }
3658
java.nio.BufferUnderflowException
        at java.nio.Buffer.nextGetIndex(Unknown Source)
        at java.nio.HeapCharBuffer.get(Unknown Source)
        at scala.io.BufferedSource$$anon$2.next(BufferedSource.scala:86)
        at scala.io.BufferedSource$$anon$2.next(BufferedSource.scala:74)
        at scala.io.Source$$anon$6.next(Source.scala:307)
        at scala.io.Source$$anon$6.next(Source.scala:301)
        at scala.Iterator$cla...

为什么我这样做java.nio.BufferUnderflowException？

注意 - 我正在处理10个日志文件,每个文件大小约为1MB

我正在用Java编写一个小型UDP服务器.当服务器收到命令('GET_VIDEO')时,他会读取一个文件('video.raw'),然后将其发送给客户端.

这是我的代码:

public class ServeurBouchon {

    /**
     * @param args
     */
    public static void main(String[] args) throws Exception {

        byte[] buff = new byte[64];
        int port = 8080;
        DatagramPacket packet = new DatagramPacket(buff, buff.length);
        DatagramSocket socket = new DatagramSocket(port);

        System.out.println("Server started at 8080 ...");

        while (true) {
            socket.receive(packet);
            new ThreadVideo(socket, packet).run();
        }

    }

    public static class ThreadVideo extends Thread {

        private DatagramSocket socket;
        private DatagramPacket packet;

        public ThreadVideo(DatagramSocket socket, DatagramPacket packet) {
            this.packet = packet;
            this.socket = socket;
        }

        public …

我正在写一个文件的值.

值写得正确.在另一个应用程序中,我可以无任何例外地读取文件.

但是在我的新应用程序中,我Bufferunderflowexception在尝试读取文件时得到了一个.

我花了好几天来解决这个问题,但我只是不知道如何解决它.

做了很多研究.

该bufferunderflowexception指:

Double X1 = mappedByteBufferOut.getDouble(); //8 byte (double)

这是我读取文件的代码:

 @Override
    public void paintComponent(Graphics g) {

    RandomAccessFile randomAccessFile = null;
    MappedByteBuffer mappedByteBufferOut = null;
    FileChannel fileChannel = null;

    try {
        super.paintComponent(g);

        File file = new File("/home/user/Desktop/File");

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

        fileChannel = randomAccessFile.getChannel();

        mappedByteBufferOut = fileChannel.map(FileChannel.MapMode.READ_ONLY, 0, randomAccessFile.length());

        while (mappedByteBufferOut.hasRemaining()) {

            Double X1 = mappedByteBufferOut.getDouble(); //8 byte (double)
            Double Y1 = mappedByteBufferOut.getDouble();
            Double X2 = mappedByteBufferOut.getDouble();
            Double Y2 = mappedByteBufferOut.getDouble();
            int …