使用AsynchronousFileChannel类写入文件

import java.io.IOException;

import java.nio.ByteBuffer;

import java.nio.channels.AsynchronousFileChannel;

import java.nio.channels.CompletionHandler;/** n o w j a v a . c o m - 时代Java 提 供 **/

import java.nio.channels.WritePendingException;

import java.nio.file.Paths;

import java.nio.file.StandardOpenOption;

import java.util.concurrent.ExecutionException;

import java.util.concurrent.Future;


public class Main {


    public static void main(String[] args) {

        try (AsynchronousFileChannel fileChannel =

                        AsynchronousFileChannel.open(Paths.get("/home/docs/asynchronous.txt"),

                        StandardOpenOption.READ, StandardOpenOption.WRITE,

                        StandardOpenOption.CREATE)) {

            CompletionHandler<Integer, Object> handler =

                    new CompletionHandler<Integer, Object>() {/*来 自 时 代 J a v a - N o w J a v a . c o m*/


                        @Override

                        public void completed(Integer result, Object attachment) {

                            System.out.println("Attachment: " + attachment

                                    + " " + result + " bytes written");

                            System.out.println("CompletionHandler Thread ID: "

                                    + Thread.currentThread().getId());

                        }


                        @Override

                        public void failed(Throwable e, Object attachment) {

                            System.err.println("Attachment: "

                                    + attachment + " failed with:");

                            e.printStackTrace();

                        }

                    };


            System.out.println("Main Thread ID: " + Thread.currentThread().getId());

            fileChannel.write(