Main.java Source code

Introduction

Here is the source code for Main.java

Source

import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.AsynchronousFileChannel;
import java.nio.channels.CompletionHandler;
import java.nio.charset.Charset;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.StandardOpenOption;

public class Main {
    public static void main(String[] args) throws Exception {
        Path path = Paths.get("test.txt");
        AsynchronousFileChannel afc = AsynchronousFileChannel.open(path, StandardOpenOption.WRITE,
                StandardOpenOption.CREATE);
        WriteHandler handler = new WriteHandler();
        ByteBuffer dataBuffer = getDataBuffer();
        Attachment attach = new Attachment();
        attach.asyncChannel = afc;
        attach.buffer = dataBuffer;
        attach.path = path;

        afc.write(dataBuffer, 0, attach, handler);

        System.out.println("Sleeping for 5  seconds...");
        Thread.sleep(5000);
    }

    public static ByteBuffer getDataBuffer() {
        String lineSeparator = System.getProperty("line.separator");
        StringBuilder sb = new StringBuilder();
        sb.append("test");
        sb.append(lineSeparator);
        sb.append("test");
        sb.append(lineSeparator);
        String str = sb.toString();
        Charset cs = Charset.forName("UTF-8");
        ByteBuffer bb = ByteBuffer.wrap(str.getBytes(cs));
        return bb;
    }
}

class Attachment {
    public Path path;
    public ByteBuffer buffer;
    public AsynchronousFileChannel asyncChannel;
}

class WriteHandler implements CompletionHandler<Integer, Attachment> {
    @Override
    public void completed(Integer result, Attachment attach) {
        System.out.format("%s bytes written  to  %s%n", result, attach.path.toAbsolutePath());
        try {
            attach.asyncChannel.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    @Override
    public void failed(Throwable e, Attachment attach) {
        try {
            attach.asyncChannel.close();
        } catch (IOException e1) {
            e1.printStackTrace();
        }
    }
}