最最简单的客户端与服务端的连接

package cn.xwy.client;

import java.io.BufferedWriter;
import java.io.IOException;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.net.Socket;
import java.net.UnknownHostException;

public class Client {
public static void main(String[] args) throws UnknownHostException, IOException {
Socket s = new Socket("192.168.1.114", 6789);//ipv4地址
OutputStream os = s.getOutputStream();
BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(os));
bw.write("你好，连接上了！！！");
bw.close();
os.close();
s.close();
}
}

package cn.xwy.server;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.ServerSocket;
import java.net.Socket;

public class Server {
public static void main(String[] args) throws IOException {
ServerSocket ss = new ServerSocket(6789);
while (true) {
Socket s = ss.accept();
InputStream is = s.getInputStream();
BufferedReader br = new BufferedReader(new InputStreamReader(is));
String string = br.readLine();
System.out.println("客户端说：" + string);
br.close();
is.close();
s.close();
}

}
}