public class EchoServer { private static final int BUFFER_SIZE = 1024; private final static int DEFAULT_PORT = 9090; // The buffer into which we'll read data when it's available private ByteBuffer readBuffer = ByteBuffer.allocate(BUFFER_SIZE); private InetAddress hostAddress = null; private ...
import java.io.BufferedWriter; import java.io.IOException; import java.io.InputStreamReader; import java.io.OutputStreamWriter; import java.io.PrintWriter; import java.net.Socket; import java.net.UnknownHostException; public class EchoClient { public static void main(String args[]){ String hostname...
/* TCPEchoClient.java */importjava.io.*;importjava.net.*;publicclassTCPEchoClient{publicfinalstaticStringserverIP="localhost";publicfinalstaticintserverPort=4347;publicstaticStringuserName=null;publicstaticvoidmain(String[] args){Socketclient=null;BufferedReadersin=null;Writercout=null;BufferedReadercin=...
publicclassDecoderHandlerextendsByteToMessageDecoder{ //最小的数据长度:开头标准位1字节 privatestaticintMIN_DATA_LEN=6; //数据解码协议的开始标志 privatestaticbytePROTOCOL_HEADER=0x58; //数据解码协议的结束标志 privatestaticbytePROTOCOL_TAIL=0x63; privateLoggerlogger=Logger.getLogger(this.getClass()); prot...
本文使用 Wireshark 抓包工具,Windows Telnet 客户端以及 Java 编写的 EchoServer 程序,验证了 TCP 中的三次握手和四次挥手的过程。除此以外,本文还为大家展示了著名的半关闭状态。 简介 想要理解 TCP 的三次握手和四次挥手和 Java Socket,首先需要掌握 TCP 的报头结构(传送门)。如下图所示: ...
The TCP server keeps on listening for message from the machine on which the connection has been established and various actions are performed on the basis of the message name. Every time I execute the code, I get the following error: java.net.BindException: Address already in use: JVM_Bind...
ECHO 程序是网络编程通信交互的一个经典案例,称为回应程序,即客户端输入哪些内容,服务端会在这些内容前加上“ECHO”并将信息发回给客户端。 EchoServer.java import java.io.BufferedReader;import java.io.BufferedWriter;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;impo...
JAVA笔记15__TCP服务端、客户端程序 / ECHO程序 / /*** TCP:传输控制协议,采用三方握手的方式,保证准确的连接操作。 * UDP:数据报协议,发送数据报,例如:手机短信或者是QQ消息。*//*** TCP服务器端程序*/publicclassMain {publicstaticvoidmain(String[] args) {try{...
public class EchoServerHandler extends ChannelInboundHandlerAdapter { @Override public void userEventTriggered(ChannelHandlerContext ctx, Object evt) throws Exception { if (ChannelOutputShutdownEvent.INSTANCE == evt) { ...处理写通道关闭事件... } } } 此时主动关闭方已经关闭了写通道,进入 FIN_WAIT2...
UserEventTriggered 也是一种 Inbound 类事件,在 pipeline 中的传播反向也是从前向后传播。 image.png 我们可以在 ChannelHandler 中这样捕获 ChannelOutputShutdownEvent 写通道关闭事件: public class EchoServerHandler extends ChannelInboundHandlerAdapter { @Override public void userEventTriggered(ChannelHandlerContext...