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java nio echo server     所属分类 nio 浏览量 97
telnet 连接测试
telnet 127.0.0.1 8000



NioEchoServer start,port=8000
client socketChannel java.nio.channels.SocketChannel[connected local=/127.0.0.1:8000 remote=/127.0.0.1:56357]
receiveData,len=3,data=a

receiveData,len=3,data=b

receiveData,len=3,data=c

收到的数据 带了 回车换行符 ,因此长度多了2


完整代码 https://gitee.com/dyyx/hellocode/blob/master/src/nio/echo/NioEchoServer.java import java.net.InetSocketAddress; import java.net.ServerSocket; import java.nio.ByteBuffer; import java.nio.channels.SelectionKey; import java.nio.channels.Selector; import java.nio.channels.ServerSocketChannel; import java.nio.channels.SocketChannel; import java.nio.charset.Charset; import java.util.Iterator; public class NioEchoServer{ private static final Charset UTF8 = Charset.forName("UTF-8"); public static void main(String[] args) throws Exception{ //-Dport=8000 int port = getInt(System.getProperty("port")); if(port <= 0) { port=8000; } ServerSocketChannel serverSocketChannel = ServerSocketChannel.open(); serverSocketChannel.configureBlocking(false); ServerSocket serverSocket = serverSocketChannel.socket(); serverSocket.bind(new InetSocketAddress(port)); System.out.println("NioEchoServer start,port="+port); Selector selector = Selector.open(); serverSocketChannel.register(selector, SelectionKey.OP_ACCEPT); while(selector.select()>0){ Iterator< SelectionKey> iterator = selector.selectedKeys().iterator(); while(iterator.hasNext()){ SelectionKey selectionKey = iterator.next(); iterator.remove(); if(selectionKey.isAcceptable()){ ServerSocketChannel server = (ServerSocketChannel)selectionKey.channel(); SocketChannel socketChannel = server.accept(); if(socketChannel==null){ continue; } socketChannel.configureBlocking(false); socketChannel.register(selector, SelectionKey.OP_READ); System.out.println("client socketChannel "+socketChannel); } if(selectionKey.isReadable()){ SocketChannel socketChannel = (SocketChannel)selectionKey.channel(); ByteBuffer readBuffer = ByteBuffer.allocateDirect(1024); socketChannel.read(readBuffer); readBuffer.flip(); String receiveData= UTF8.decode(readBuffer).toString(); System.out.println("receiveData,len="+receiveData.length()+",data="+receiveData); // selectionKey.attach(receiveData); // 直接写 不用注册写事件 ByteBuffer writeBuffer = ByteBuffer.allocateDirect(1024); writeBuffer.put(receiveData.getBytes(UTF8)); writeBuffer.flip(); while(writeBuffer.hasRemaining()){ socketChannel.write(writeBuffer); } } if(selectionKey.isWritable()){ SocketChannel socketChannel = (SocketChannel)selectionKey.channel(); String message = (String) selectionKey.attachment(); if(message==null){ continue; } selectionKey.attach(null); ByteBuffer writeBuffer = ByteBuffer.allocateDirect(1024); writeBuffer.put(message.getBytes()); writeBuffer.flip(); while(writeBuffer.hasRemaining()){ socketChannel.write(writeBuffer); } } } } } private static int getInt(String str) { try { return Integer.parseInt(str); }catch(Throwable e) { return 0; } } }

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