请求老师帮忙看一下错误：

try {

//1.创建客户端Socket，指定服务器地址和端口

Socket socket=new Socket("localhost", 1280);

//2.获取输出流，向服务器端发送信息

OutputStream os=socket.getOutputStream();//字节输出流

PrintWriter pw=new PrintWriter(os);//将输出流包装为打印流

pw.write("用户名：alice;密码：789");

pw.flush();

// socket.shutdownOutput();//关闭输出流

//3.获取输入流，并读取服务器端的响应信息

InputStream is=socket.getInputStream();

BufferedReader br=new BufferedReader(new InputStreamReader(is));

String info=null;

while((info=br.readLine())!=null){

System.out.println("我是客户端，服务器说："+info);

}

//4.关闭资源

br.close();

is.close();

pw.close();

os.close();

socket.close();

} catch (UnknownHostException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

java.net.ConnectException: Connection timed out: connect

at java.net.DualStackPlainSocketImpl.connect0(Native Method)

at java.net.DualStackPlainSocketImpl.socketConnect(Unknown Source)

at java.net.AbstractPlainSocketImpl.doConnect(Unknown Source)

at java.net.AbstractPlainSocketImpl.connectToAddress(Unknown Source)

at java.net.AbstractPlainSocketImpl.connect(Unknown Source)

at java.net.PlainSocketImpl.connect(Unknown Source)

at java.net.SocksSocketImpl.connect(Unknown Source)

at java.net.Socket.connect(Unknown Source)

at java.net.Socket.connect(Unknown Source)

at java.net.Socket.<init>(Unknown Source)

at java.net.Socket.<init>(Unknown Source)

at com.socket.Client.main(Client.java:49)