Java的TCP编程的简单问题

[花果山牛哥哥]

java 的TCP编程，简单地server和client通信，但是先运行server，再运行client以后，控制台并没有打印输出，很奇怪，期望前辈能解惑
这是server的代码

public class Server {

	public static void main(String[] args) throws IOException{
		ServerSocket server = new ServerSocket(9090);	
		Socket socket = server.accept();
		BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
		PrintWriter out = new PrintWriter(socket.getOutputStream());
				
		String line = null;
		while((line = in.readLine()) != null){
			System.out.println("我是服务器端，客户端说："+line);
		}
		
		out.write("欢迎您!");
		out.flush();
		
		in.close();
		out.close();
		socket.close();
		server.close();
	}
				
}

这是client的代码

public class Client {

	public static void main(String[] args) throws UnknownHostException, IOException{
		Socket client = new Socket("127.0.0.1",9090);
				
		PrintWriter out = new PrintWriter(client.getOutputStream());
		out.write("你好~");
		out.flush();
		
		BufferedReader in = new BufferedReader(new InputStreamReader(client.getInputStream()));		
		String line;
		while((line = in.readLine()) != null){
			System.out.println("我是客户端，服务器端说："+line);
		}
		//关闭输出/入流，关闭客户端Socket	
		in.close();
		out.close();
		client.close();
		
	}
}