JAVA开启socket从流中读取2进制并转化为16进制_java serversocket 接收请求 二进制转十六进制

public class SocketReceiveUtil {
    public static void main(String[] args) {
        for (int i = 0; i < 5; i++) {
            String rtfNumber = getRtfNumber();
            System.out.println(rtfNumber);
        }
    }

    private static String getRtfNumber() {
        try {
            return getNumber();
        } catch (Exception e) {
            System.out.println("获取数据超时");
            return "";
        }
    }

    public static String getNumber() throws Exception {
        ServerSocket server = new ServerSocket(8888);
        try {
            Socket client = server.accept();
            client.setSoTimeout(1000);
            try {
                InputStream inputStream = client.getInputStream();
                byte[] bytes = new byte[1025];
                int readBytes = 0;
                int len = bytes.length;
                while (readBytes < len) {
                    int read = inputStream.read(bytes, readBytes, len - readBytes);
                    //判断是不是读到了数据流的末尾 ，防止出现死循环。
                    if (read == -1) break;
                    readBytes += read;
                }
                String resultNum = byteArrayToHexString(bytes);
                return StringUtils.isNotBlank(resultNum) ? resultNum : "";
            } finally {
                client.shutdownInput();
                client.close();
            }
        } finally {
            server.close();
        }
    }

    private static String byteArrayToHexString(byte b[]) {
        StringBuffer resultSb = new StringBuffer();
        for (int i = 0; i < b.length; i++)
            resultSb.append(byteToHexString(b[i]));
        return resultSb.toString();
    }

    private static final String hexDigits[] = {"0", "1", "2", "3", "4", "5",
            "6", "7", "8", "9", "A", "B", "C", "D", "E", "F"};

    private static String byteToHexString(byte b) {
        int n = b;
        if (n < 0)
            n += 256;
        int d1 = n / 16;
        int d2 = n % 16;
        return hexDigits[d1] + hexDigits[d2];
    }
}
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