套接字编程：java.lang.NumberFormatException：对于输入字符串：“ 1”

Question

I'm sending a message through UDP sockets and packets: The mesajes has the following format:

"MESSAGE" + SEPARATOR + "IDCLIENT"

Here is the code on the Client :

String msg = "MESSAGE" + SEPARATOR + id;
byte[] msgBytes = msg.getBytes();
DatagramPacket p = new DatagramPacket(msgBytes, msgBytes.length, serverIP, SERVER_PORT);

DatagramSocket socket = new DatagramSocket();
socket.send(p);

Here is the code on the Server :

DatagramSocket socket = new DatagramSocket ( SERVER_PORT );
byte[] buffer = new byte[BUFFER_MSG];
DatagramPacket p = new DatagramPacket (buffer, buffer.length);
socket.receive(p);

// Here comes where my problem appears
String msg = new String ( p.getData() );
msg.trim(); //this is suposed to solve my problem, but it doesn't
String[] msgParts = msg.split(SEPARATOR);

if (msgParts.length == 2)
{
    String infoMsg = msgParts[0];
    int id = Integer.parseInt( msgParts[1] ); // Here the get the NumberFormatException
}

// Do more...

I don't understand the error messege: java.lang.NumberFormatException: For input string: "1" . Because the String "1" should be converted to the Integer 1 , as far as I know.

PS: I have ommited the try-catch staments for IOException for clarity.

Answer 1

Change msg.trim(); to msg = msg.trim(); – Elliott Frisch