Nrthugu

Can you show me a simple example to read from a file named example.txt and put all contents into a string in my java program using java NIO?

Following is what I'm using for the moment:

FileChannel inChannel = FileChannel.open(Paths.get(file),StandardOpenOption.READ);

CharBuffer buf=ByteBuffer.allocate(1024).asCharBuffer();

while(inChannel.read(buf)!=-1) {

    buf.flip();

    while(buf.hasRemaining()) {

        //append to a String

        buf.clear();

    }

}

Try this:

public static String readFile(File f, int bufSize) {

    ReadableByteChannel rbc = FileChannel.open(Paths.get(f),StandardOpenOption.READ);

    char ca = new char[bufSize];

    ByteBuffer bb = ByteBuffer.allocate(bufSize);

    StringBuilder sb = new StringBuilder();

    while(rbc.read(bb) > -1) {

        CharBuffer cb = bb.asCharBuffer();

        cb.flip();

        cb.get(ca);

        sb.append(ca);

        cb.clear();

    }

    return sb.toString();

}

You could do without the middle man buffer ca if writing char by char is acceptable performance wise. In which case you could simply sb.append(cb.get()).