public class HexConver
{
	public static void main(String[] args)
	{
		String content = "這是一個測試";
		System.out.println("原字串："+content);
		String hex2Str = conver2HexStr(content.getBytes());
		System.out.println("\n轉換為二進位制的表示形式："+hex2Str);
		byte [] b = conver2HexToByte(hex2Str);
		System.out.println("二進位制字串還原："+new String(b));
		
		String hex16Str = conver16HexStr(content.getBytes());
		System.out.println("\n轉換為十六進位制的表示形式:"+ hex16Str);
		System.out.println("十六進位制字串還原:"+ new String(conver16HexToByte(hex16Str)));
	}
	
	/**
	 * byte陣列轉換為二進位制字串,每個位元組以","隔開
	 * **/
	public static String conver2HexStr(byte [] b)
	{
		StringBuffer result = new StringBuffer();
		for(int i = 0;i<b.length;i++)
		{
			result.append(Long.toString(b[i] & 0xff, 2)+",");
		}
		return result.toString().substring(0, result.length()-1);
	}
	
	/**
	 * 二進位制字串轉換為byte陣列,每個位元組以","隔開
	 * **/
	public static byte[] conver2HexToByte(String hex2Str)
	{
		String [] temp = hex2Str.split(",");
		byte [] b = new byte[temp.length];
		for(int i = 0;i<b.length;i++)
		{
			b[i] = Long.valueOf(temp[i], 2).byteValue();
		}
		return b;
	}
	
	
	/**
	 * byte陣列轉換為十六進位制的字串
	 * **/
	public static String conver16HexStr(byte [] b)
	{
		StringBuffer result = new StringBuffer();
		for(int i = 0;i<b.length;i++)
		{
			if((b[i]&0xff)<0x10) 
				result.append("0");
			result.append(Long.toString(b[i]&0xff, 16));
		}
		return result.toString().toUpperCase();
	}
	
	/**
	 * 十六進位制的字串轉換為byte陣列
	 * **/
	public static byte[] conver16HexToByte(String hex16Str)
	{
		char [] c = hex16Str.toCharArray();
		byte [] b = new byte[c.length/2];
		for(int i = 0;i<b.length;i++)
		{
			int pos = i * 2;
			b[i] = (byte)("0123456789ABCDEF".indexOf(c[pos]) << 4 | "0123456789ABCDEF".indexOf(c[pos+1]));
		}
		return b;
	}
}
 

執行效果：