利用Socket, 在服务器端编程发送数据, 客户端接受该数据

package cn.antraces.NET;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
public class SocketTest implements Runnable{
@Override
public void run() { //由于调用了accept, 所以将服务端放入单独的线程
    try {
        server();
    } catch (IOException e) {
        e.printStackTrace();
    }
}
public SocketTest(){
Thread th = new Thread(this);
th.start();
try {
client();
} catch (IOException e) {
e.printStackTrace();
}
}
public static void server() throws IOException {
ServerSocket serverSocket = new ServerSocket(23333);
Socket socket = serverSocket.accept();  //调用accept阻塞，等待客户端连接。
PrintWriter printWriter = new PrintWriter(socket.getOutputStream(), true);
printWriter.println("Hello, world!"); //向客户端发送 "Hello, world!"
socket.close();
serverSocket.close();
}
public static void client() throws IOException {
Socket socket = new Socket("127.0.0.1",23333);
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(socket.getInputStream()));
System.out.println(bufferedReader.readLine());
bufferedReader.close();
socket.close();
}
public static void main (String[] args){
new SocketTest();
}

}