package org.lanqiao.blocking2.demo;

import java.io.IOException;
import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.nio.channels.SocketChannel;
import java.nio.file.Paths;
import java.nio.file.StandardOpenOption;

/*
 *	1. 獲取通道
	2. 分配指定大小的緩衝區
	3. 讀取本地檔案，併發送到服務端
	4. 關閉通道 
 */
public class Client {
	public static void main(String[] args) throws IOException {
		System.out.println("客戶端啟動....");
		//1 獲取通道
		SocketChannel sChannel  = SocketChannel.open(new InetSocketAddress("127.0.0.1", 9898));
		//2 分配指定大小的緩衝區
		ByteBuffer  buf = ByteBuffer.allocate(1024);
		//3 讀取本地檔案，併發送到服務端
		FileChannel fChannel = FileChannel.open(Paths.get("aa.jpg"), StandardOpenOption.READ);
		while((fChannel.read(buf)) != -1) {
			buf.flip();
			sChannel.write(buf);
			buf.clear();
		}
		//告知服務端傳送資料完畢
		sChannel.shutdownOutput();
		//3.1 接收服務端的反饋內容
		while(sChannel.read(buf) != -1) {
			buf.flip();
			
			byte[] b = buf.array();
			
			System.out.println(new String(b,0,buf.limit()));
			
		}
		
		//4 關閉通道
		fChannel.close();
		sChannel.close();
	}
}
 

package org.lanqiao.blocking2.demo;

import java.io.IOException;
import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.nio.channels.ServerSocketChannel;
import java.nio.channels.SocketChannel;
import java.nio.file.Paths;
import java.nio.file.StandardOpenOption;

/**服務端：
	1. 獲取通道
	2. 繫結連線
	3. 獲取客戶端連線的通道
	4. 分配指定大小的緩衝區
	5. 接收客戶端的資料，並儲存到本地
	6. 關閉通道
*/
public class Server {
	public static void main(String[] args) throws IOException {
		System.out.println("服務端啟動...");
		//1 獲取通道
		ServerSocketChannel ssChannel  = ServerSocketChannel.open();
		//2 繫結連結
		ssChannel.bind(new InetSocketAddress( 9898));
		// 3 獲取客戶端的通道
		SocketChannel sChannel = ssChannel.accept();
		//4分配指定大小的緩衝區
		ByteBuffer buf  = ByteBuffer.allocate(1024);
		//5 接收客戶端的資料， 並儲存到本地
		FileChannel fChannel = FileChannel.open(Paths.get("aaCopy.jpg"), StandardOpenOption.WRITE,StandardOpenOption.CREATE);
		
		while((sChannel.read(buf)) != -1) {
			buf.flip();
			fChannel.write(buf);
			buf.clear();
			
		}
		//5.1 向客戶端傳送反饋內容
		buf.put("接收成功".getBytes());
		buf.flip();
		sChannel.write(buf);
		//6 關閉通道
		ssChannel.close();
		fChannel.close();
		sChannel.close();
	}
}