从移动设备打印时验证断点

import java.io.*;
import java.net.*;

public class MobilePrint {
    public static void main(String[] args) {
        String printData = "Hello, World!";
        String checksum = calculateChecksum(printData);

        try {
            Socket socket = new Socket("printer_ip_address", printer_port);
            OutputStream outputStream = socket.getOutputStream();
            PrintWriter writer = new PrintWriter(outputStream, true);

            writer.println(checksum);
            writer.println(printData);

            writer.flush();
            writer.close();
            socket.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private static String calculateChecksum(String data) {
        // 计算校验和的逻辑
        return "checksum_value";
    }
}