java 兩個byte表示 端口號

//可直接在main方法中運行

	//將8080 端口轉爲2字節byte
    byte[] bytes=new byte[2];
    short port = (short) Integer.parseInt("8080");
    bytes[0] = (byte)((port >> 8) & 0x00ff);
    bytes[1] = (byte)(port & 0x00ff);
	
	//測試結果
	//將byte的值轉string 
   StringBuffer st=new StringBuffer();
    for (int i=0;i<bytes.length;i++){
        String hex = Integer.toHexString(bytes[i] & 0xFF);
        if(hex.length() < 2){
            st.append(0);
        }
        st.append(hex);
    }
     System.out.println("byte值爲："+String.valueOf(st));
    //轉10進制顯示端口號
    System.out.println("端口號爲："+Integer.parseInt(String.valueOf(st),16));
    ![在這裏插入圖片描述](https://img-blog.csdnimg.cn/20200529173548684.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyNzU0MzQ3,size_16,color_FFFFFF,t_70#pic_center)

//ok上圖