tcp代码java java tcp keepalive

java如何通过tcp发送指令

以下是一个展示java使用tcp通讯的简单例子，包括服务器和客户端代码：

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/**

*TCPServer

*/

import java.io.*;

import java点虐 .*;

class TCPServer{

public static void main(String[] args)throws IOException{

ServerSocket listen = new ServerSocket(5050);

Socket server = listen.accept();

InputStream in = server.getInputStream();

OutputStream out = server.getOutputStream();

char c = (char)in.read();

System.out.println("收到:" + c);

out.write('s');

out.close();

in.close();

server.close();

listen.close();

}

}

/**

*TCPClient

*/

import java.io.*;

import java点虐 .*;

class TCPClient{

public static void main(String[] args)throws IOException{

Socket client = new Socket("127.0.0.1" , 5050);

InputStream in = client.getInputStream();

OutputStream out = client.getOutputStream();

out.write('c');

char c = (char)in.read();

System.out.println("收到:" + c);

out.close();

in.close();

client.close();

}

}

求TCP/IP client server socket的JAVA代码

我这刚好有一个，给你参考一下：（分客户端和服务器两个小程序）

//客户端程序及聊天室的图形用户界面

import java.awt.event.*;

import javax.swing.*;

import java.io.*;

import java点虐 .InetAddress;

import java点虐 .Socket;

public class ChatTCPSocketJFrame extends JFrame implements ActionListener

{

private String name; //网名

private Socket socket; //TCP Socket对象

private JTextArea text_receiver; //显示对话内容的文本区

private JTextField text_sender; //输入发送内容的文本行

private JButton button_send,button_leave; //发送和离线按钮

private PrintWriter cout; //字符输出流对象

public ChatTCPSocketJFrame(String name, Socket socket) throws IOException//提供图形用户界面

{

super("聊天室 "+name+" "+InetAddress.getLocalHost()+" : "+socket.getLocalPort());

this.setBounds(320,240,400,240);

this.setDefaultCloseOperation(EXIT_ON_CLOSE);

this.text_receiver = new JTextArea();

this.text_receiver.setEditable(false); //文本区不可编辑

this.getContentPane().add(new JScrollPane(this.text_receiver));

JPanel panel = new JPanel();

this.getContentPane().add(panel,"South");

this.text_sender = new JTextField(16);

panel.add(this.text_sender);

button_send = new JButton("发送");

panel.add(button_send);

button_send.addActionListener(this);

button_leave = new JButton("离线");

panel.add(button_leave);

button_leave.addActionListener(this);

this.setVisible(true);

this.name = name;

this.socket = socket;

this.cout = new PrintWriter(socket.getOutputStream(),true);//获得Socket对象的输出流，立即flush

this.cout.println(name); //发送自己网名给对方

BufferedReader cin=new BufferedReader(new InputStreamReader(socket.getInputStream()));

//获得Socket对象的输入流，创建字符输入流

String aline=cin.readLine(); //接收到对方网名

text_receiver.append("连接"+aline+"成功"+"\r\n"); //显示对方发来的内容

aline= cin.readLine();

while (aline!=null !aline.equals("bye")) //从输入流接收对方发来的字符串

{ //"bye"是约定的离线信息

text_receiver.append(aline+"\r\n"); //显示对方发来的内容

aline= cin.readLine();

}

cin.close();

cout.close();

socket.close(); //关闭Socket连接

button_send.setEnabled(false);

button_leave.setEnabled(false);

}

public ChatTCPSocketJFrame(String name, String host, int port) throws IOException //客户端

{

this(name, new Socket(host, port)); //客户端向指定主机的端口发出TCP连接请求

}

public void actionPerformed(ActionEvent e)

{

if (e.getSource()==button_send) //发送按钮

{

this.cout.println(name+" 说："+text_sender.getText()); //通过流发送给对方

text_receiver.append("我说："+text_sender.getText()+"\n");

text_sender.setText("");

}

if (e.getSource()==button_leave) //离线

{

text_receiver.append("我离线\n");

this.cout.println(name+"离线\n"+"bye"); //发送给对方离线约定

button_send.setEnabled(false);

button_leave.setEnabled(false);

}

}

public static void main(String args[]) throws IOException

{

new ChatTCPSocketJFrame("小蜜蜂", "127.0.0.1", 2001);

}

}

//服务端程序

import java点虐 .*;

import java.io.*;

public class ChatTCPServer

{

public ChatTCPServer(int port, String name) throws IOException //约定端口、网名

{ //本机IP地址和指定端口构成服务端的Socket

ServerSocket server = new ServerSocket(port); //ServerSocket提供TCP连接服务

Socket client = server.accept(); //等待接收客户端的连接申请

new ChatTCPSocketJFrame(name,client); //服务端的聊天室，图形用户界面同客户端

server.close();

}

public static void main(String args[]) throws IOException

{

new ChatTCPServer(2001, "花仙子"); //启动服务端，约定端口，指定网名

}

}

用java编写一个能进行简单TCP/IP通信的C/S程序

import java点虐 .ServerSocket;

import java点虐 .Socket;

public class TcpServer

{

public static void main(String[] args) throws Exception

{

// 创建服务器端的socket对象

ServerSocket ss = new ServerSocket(5000);

// 监听连接

Socket socket = ss.accept();

// 直到连接建立好之后代码才会往下执行

System.out.println("Connected Successfully!");

}

}

import java点虐 .Socket;

public class TcpClient

{

public static void main(String[] args) throws Exception

{

Socket socket = new Socket("127.0.0.1", 5000);

}

}