Java网络编程
TCP和UDP
Socket编程
ServerSocket和Socket
TCPServer .java
import java.net.*;
import java.io.*;
/*
首先启动Server，在启动Client，编写时也是一样
*/
public class TCPServer {
public static void main(String[] args) throws Exception {
//ServerSocket(int port)，指定端口为6666
ServerSocket ss = new ServerSocket(6666);
/*
Socket s = ss.accept();
System.out.println("a client connect!");
*/
while(true) {
//accept()接受,阻塞式的
Socket s = ss.accept();
System.out.println("a client connect!");
//输入流
DataInputStream dis = new DataInputStream(s.getInputStream());
//readUTF,读，阻塞式的
System.out.println(dis.readUTF());
dis.close();
s.close();
}
}
}
TCPClient.java
import java.net.*;
import java.io.*;
public class TCPClient {
public static void main(String[] args) throws Exception {
//Socket(String host, int port),指定主机和端口
Socket s = new Socket("127.0.0.1", 6666);
//输出流
OutputStream os = s.getOutputStream();
DataOutputStream dos = new DataOutputStream(os);
Thread.sleep(3000);
//写
dos.writeUTF("hello server!");
dos.flush();
dos.close();
s.close();
}
}
f:\java\socket>javac TCPServer.java f:\java\socket>java TCPServer a client connect! f:\java\socket>java TCPServer a client connect! f:\java\socket>javac TCPServer.java f:\java\socket>java TCPServer a client connect! hello server! a client connect! hello server! a client connect! hello server!
f:\java\socket>javac TCPClient.java f:\java\socket>java TCPClient f:\java\socket>java TCPClient f:\java\socket>java TCPClient f:\java\socket>