读写Java套接字而不会阻塞

Question

I have a simple Java IO TCP server/client protoype, where the server is writing heavily to the client, and the client writes occasionally to the server. Writing occurs a while loop, particularly in the run() method of a Worker thread, as is standard:

@Override
public void run() {
    while (true) {
        // Server writes to client
        try {
            socket.getOutputStream.write(writeArray);
        } catch (Exception e) {
            System.exit(1);
        }
}

This is in a while loop, so if I also included a read operation, it would block.

@Override
public void run() {
    while (true) {
        // Server writes to client
        try {
            socket.getOutputStream.write(writeArray);
        } catch (Exception e) {
            System.exit(1);
        }

        // Server reads from client
        try {
            int read = socket.getInputStream.read();
        } catch (Exception e) {
            System.exit(1);
        }
}

Is there a standard pattern on how to allow for occasional reads without blocking or heavily wasting CPU cycles?

Answer 1

Take a look at the available() method: https://docs.oracle.com/javase/8/docs/api/java/io/InputStream.html#available-- . Then you only need to read "if available".