NIO和IO

1、BIO

Server端

package com.strive.bio;


import java.io.IOException;
import java.io.InputStream;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

/**
 * 作者：程序猿-南巷清风
 * 博客地址：https://blog.csdn.net/weixin_42152604(关注一下下^_^)
 * QQ：1821119445  java开发的朋友们可以加(非诚勿扰好吧！)
 */
public class TcpServer {
    public static void main(String[] args) throws IOException {
        ExecutorService executorService = Executors.newCachedThreadPool();
        ServerSocket serverSocket = new ServerSocket(8888);
        while (true) {
            //接收到一个请求，线程池执行一次线程操作，接下来再次等待请求
            Socket accept = serverSocket.accept();
            executorService.execute(
                    () -> {
                        try {
                            InputStream inputStream = accept.getInputStream();
                            StringBuilder stringBuilder = new StringBuilder();
                            while (true) {
                                byte[] bytes = new byte[1024];
                                int len = inputStream.read(bytes);
                                if (len < 0) {
                                    break;
                                }
                                stringBuilder.append(new String(bytes, 0, len));
                            }
                            System.out.println(stringBuilder.toString());
                        } catch (IOException e) {
                            e.printStackTrace();
                        }
                    });
        }
    }
}

Client端

package com.strive.bio;

import java.io.IOException;
import java.io.OutputStream;
import java.net.Socket;

/**
 * 作者：程序猿-南巷清风
 * 博客地址：https://blog.csdn.net/weixin_42152604(关注一下下^_^)
 * QQ：1821119445  java开发的朋友们可以加(非诚勿扰好吧！)
 */
public class TcpClient {
    public static void main(String[] args) throws IOException {
        Socket socket = new Socket("127.0.0.1",8888);
        OutputStream outputStream = socket.getOutputStream();
        outputStream.write("测试连接".getBytes());
        socket.close();
    }
}

2、NIO

Server端

package com.strive.nio;

import java.io.IOException;
import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.*;
import java.util.Iterator;

/**
 * 作者：程序猿-南巷清风
 * 博客地址：https://blog.csdn.net/weixin_42152604(关注一下下^_^)
 * QQ：1821119445  java开发的朋友们可以加(非诚勿扰好吧！)
 */
public class Server {
    public static void main(String[] args) throws IOException {
        //1、创建通道
        ServerSocketChannel serverSocketChannel = ServerSocketChannel.open();
        //2、设置阻塞模式是非阻塞
        serverSocketChannel.configureBlocking(false);
        //3、绑定连接
        serverSocketChannel.bind(new InetSocketAddress(8888));
        //4、拿取选择器
        Selector selector = Selector.open();
        //5、将通道注册到选择器"并且制定监听接受事件"
        serverSocketChannel.register(selector, SelectionKey.OP_ACCEPT);
        //6、轮训式 获取选择 “已准备就绪”的事件
        while(selector.select()>0){
            //7、获取当前选择器所有注册的“已经就绪的监听事件”
            Iterator<SelectionKey> iterator = selector.selectedKeys().iterator();
            while (iterator.hasNext()){
                //8、获取准备就绪的事件
                SelectionKey selectionKey = iterator.next();
                //9、判断具体是什么事件准备就绪
                if(selectionKey.isAcceptable()){
                    //10、若“接受就绪”，获取客户端连接
                    SocketChannel channel = serverSocketChannel.accept();
                    //11、设置阻塞模式
                    channel.configureBlocking(false);
                    //12、将该通道注册到服务器上
                    channel.register(selector,SelectionKey.OP_READ);
                }else if(selectionKey.isReadable()){
                    //13、获取当前选择器“就绪”状态通道
                    SocketChannel channel = (SocketChannel) selectionKey.channel();
                    //14、读取数据
                    ByteBuffer buffer = ByteBuffer.allocate(1024);
                    int len = 0;
                    while((len = channel.read(buffer))>0){
                        buffer.flip();
                        System.out.println(new String(buffer.array(),0,len));
                        buffer.clear();
                    }
                }
            }
            iterator.remove();
        }

    }
}

Client端

package com.strive.nio;

import java.io.IOException;
import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.SocketChannel;
import java.util.Date;
import java.util.Scanner;

/**
 * 作者：程序猿-南巷清风
 * 博客地址：https://blog.csdn.net/weixin_42152604(关注一下下^_^)
 * QQ：1821119445  java开发的朋友们可以加(非诚勿扰好吧！)
 */
public class Client {
    public static void main(String[] args) throws IOException {
        //1、创建通道
        SocketChannel socketChannel = SocketChannel.open(new InetSocketAddress("127.0.0.1", 8888));
        //2、设置阻塞模式是非阻塞
        socketChannel.configureBlocking(false);
        //3、指定缓冲区大小
        ByteBuffer byteBuffer = ByteBuffer.allocate(1024);
        Scanner scanner = new Scanner(System.in);
        while (scanner.hasNext()){
            String str = scanner.next();
            byteBuffer.put((new Date().toString()+"\n"+str).getBytes());
            //切换读取模式
            byteBuffer.flip();
            socketChannel.write(byteBuffer);
            byteBuffer.clear();
        }
        socketChannel.close();
    }
}