使用Java建立TCP连接并发送数据

 TCP协议：传输控制协议  ，应用于运输层

客户端代码--发送请求：

import java.io.IOException; import java.io.OutputStream; import java.net.Socket; import java.net.UnknownHostException; public class TCPClientDemo { public static void main(String[] args) throws UnknownHostException, IOException { // TODO Auto-generated method stub //1.建立TCP连接 String ip='10.105.53.65'; //服务器端ip地址 int port=10002; //端口号 Socket sck=new Socket(ip,port); //2.传输内容 String content='这是一个java模拟客户端'; byte[] bstream=content.getBytes('GBK'); //转化为字节流 OutputStream os=sck.getOutputStream(); //输出流 os.write(bstream); //3.关闭连接 sck.close(); } }

服务器端---接收请求

import java.io.DataInputStream; import java.io.IOException; import java.net.ServerSocket; import java.net.Socket; public class TCPServerDemo { private ServerSocket serverSocket; private DataInputStream dataInputStream; public void startServer(){ Socket socket =null; try { serverSocket = new ServerSocket(10003); socket = serverSocket.accept(); dataInputStream = new DataInputStream(socket.getInputStream()); GetMessageFromClient(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); }finally{ if(socket!=null){ try{ socket.close(); }catch(IOException e) { e.printStackTrace(); } } } } private void GetMessageFromClient(){ try { //获取消息的长度 int length = dataInputStream.read(); //获取消息 byte[] body = new byte[length]; dataInputStream.read(body); String message = new String(body); System.out.println('客户端说：' message); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } public static void main(String[] args) { // TODO Auto-generated method stub TCPServerDemo server = new TCPServerDemo(); server.startServer(); } }