为什么是文件通道.read循环永不结束?

问题是,你忘记重置缓冲区的限制和位置后,内 while 循环。读取第一个1024字符后,缓冲区将满,每次尝试读入缓冲区时,都会尝试读取到 remaining = limit - position 字节,即缓冲区满后为0字节。

另外,您应该始终从 fileChannel.read() . 在你的情况下,它会告诉你,它是不断返回 0 .

byteBuffer.clear()

public static void main(String[] args) throws IOException {
  FileChannel fileChannel = FileChannel.open(Paths.get("JPPFConfiguration.txt"), StandardOpenOption.READ, StandardOpenOption.WRITE);
  ByteBuffer byteBuffer = ByteBuffer.allocate(1024);
  int n;
  long sum = 0L;
  while ((n = fileChannel.read(byteBuffer)) != -1) {
    sum += n;
    byteBuffer.flip();
    while (byteBuffer.hasRemaining()) {
      char c = (char) byteBuffer.get();
      System.out.print(c);
    }
    System.out.println("\n read " + n  + " bytes");
    byteBuffer.clear();
  }
  System.out.println("read " + sum + " bytes total");
}