各种进制转换

byte 转字符串

    public static String hexString(byte b) {

		String hex = Integer.toHexString(b & 0xFF);
		if (hex.length() == 1) {
			hex = '0' + hex;
		}
		return hex;
	}

byte[] 转字符串(这里提供两种方法)

    public static String hexString(byte[] b) {
		StringBuffer sb = new StringBuffer();
		for (int i = 0; i < b.length; i++) {
			String hex = Integer.toHexString(b[i] & 0xFF);
			if (hex.length() == 1) {
				hex = '0' + hex;
			}
			sb.append(hex.toUpperCase());
		}
		return sb.toString();
	}

	public static String bytesToHexString(byte[] src) {
		StringBuilder stringBuilder = new StringBuilder("");
		if ((src == null) || (src.length <= 0)) {
			return null;
		}
		for (int i = 0; i < src.length; ++i) {
			int v = src[i] & 0xFF;
			String hv = Integer.toHexString(v);
			if (hv.length() < 2) {
				stringBuilder.append(0);
			}
			stringBuilder.append(hv);
		}
		return stringBuilder.toString();
	}

转换十六进制编码为字符串

    public static String toStringHex(String s) {  
        if ("0x".equals(s.substring(0, 2))) {  
            s = s.substring(2);  
        }  
        byte[] baKeyword = new byte[s.length() / 2];  
        for (int i = 0; i < baKeyword.length; i++) {  
            try {  
                baKeyword[i] = (byte) (0xff & Integer.parseInt(s.substring(  
                        i * 2, i * 2 + 2), 16));  
            } catch (Exception e) {  
                e.printStackTrace();  
            }  
        }  
        try {  
            s = new String(baKeyword, "utf-8");//UTF-16le:Not  
        } catch (Exception e1) {  
            e1.printStackTrace();  
        }  
        return s;  
    }

String类型转换byte[]

	public static byte[] hexStringToByte(String hex) {
	    int len = (hex.length() / 2);   
	    byte[] result = new byte[len];   
	    char[] achar = hex.toCharArray();   
	    for (int i = 0; i < len; i++) {   
	     int pos = i * 2;   
	     result[i] = (byte) (toByte(achar[pos]) << 4 | toByte(achar[pos + 1]));   
	    }   
	    return result;   
	}

	private static byte toByte(char c) {   
	    byte b = (byte) "0123456789ABCDEF".indexOf(c);   
	    return b;   
	}

16进制转10进制

	String X10 = Integer.valueOf(X16,16).toString();

10进制转2进制

String X2 = Integer.toBinaryString(Integer.parseInt(X10));

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