小编mic*_*aft的帖子

我的网络中有5个设备具有不同的IP地址.我希望连接到这些设备,并在我的网络中可用时通过TCP/IP套接字从中获取数据.如何检查它们是否在java中可用？

public void setUpConnection() {
    try {
        Socket client = new Socket(hostIp, hostPort);
        socketReader = client.getInputStream();
        socketWriter = new PrintWriter(client.getOutputStream());
    } catch (UnknownHostException e) {
        System.out.println("Error setting up socket connection: unknown host at " +   hostIp);
        System.out.println("host: " + hostIp + "port: " + hostPort);
    } catch (IOException e) {
        System.out.println("Error setting up socket connection: " + e);
        System.out.println("host: " + hostIp + "port:" + hostPort);
    }
}

有没有办法计算两个十六进制值而不将其转换为int？例如:

String sHex = "f7c0";
String bHex = "040000000";