【Java nio】 Blocking nio

 package com.slp.nio;

 import org.junit.Test;

 import java.io.File;
 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;

 /**
  * Created by sanglp on 2017/3/1.
  * 一、使用NIO完成网络通信的三个核心
  * 1、通道：负责连接
  *     |--java.nio.channels.channel接口
  *        |--SelectableChannel
  *           |--SocketChannel
  *           |--ServerSocketChannel
  *           |--DatagramChannel
  *
  *           |--Pipe.SinkChannel
  *           |--Pipe.SourceChannel
  * 2、缓冲区：负责数据的存取
  * 3、选择器：是SelectableChannel的多路复用器，用于监控SelectableChannel的IO状况
  *
  */
 public class TestBlockingNIO {
     //客户端
     @org.junit.Test
     public void client() throws IOException {
       // 1、获取通道
        SocketChannel socketChannel = SocketChannel.open(new InetSocketAddress("127.0.0.1",9898));
         FileChannel inChannel = FileChannel.open(Paths.get("2.jpg"), StandardOpenOption.READ);
         //2、分配指定大小的缓冲区
         ByteBuffer buffer =ByteBuffer.allocate(1024);
         //3、读取本地文件 并发送到服务端
         while (inChannel.read(buffer)!=-1){
             buffer.flip();
             socketChannel.write(buffer);
             buffer.clear();
         }
         //4、关闭通道
         socketChannel.close();
         inChannel.close();
     }
     //服务端
     @Test
     public void server() throws IOException {
         //1、获取通道
         ServerSocketChannel serverSocketChannel = ServerSocketChannel.open();
         FileChannel outChannel = FileChannel.open(Paths.get("3.jpg"),StandardOpenOption.WRITE,StandardOpenOption.CREATE);
         //2、绑定连接
         serverSocketChannel.bind(new InetSocketAddress(9898));
         //3、获取客户端连接
         SocketChannel socketChannel = serverSocketChannel.accept();
         //4、分配指定大小的缓冲区
         ByteBuffer buffer = ByteBuffer.allocate(1024);

         //5、接收客户端的数据，并保存到本地

         while (socketChannel.read(buffer)!=-1){
             buffer.flip();
             outChannel.write(buffer);
             buffer.clear();
         }
         //关闭通道
         socketChannel.close();
         serverSocketChannel.close();

     }
 }