java 十进制数和十六进制数互相转换，正则等知识总结_java byte数组十进制转16进制数组

一、将 "a"转化为 "10" 的样式

public static String hexStrToIntStr(String hexStr) {
		// 不存在数据时 返回null
		if (hexStr == null || hexStr == "") {
			return null;
		}
		String regexStr = "^[A-Fa-f0-9]+$";
		// 字符串超过十六进制数 返回null
		if (!hexStr.matches(regexStr)) {
			return null;
		}
		// 进行字符的转换
		Integer in = Integer.parseInt(hexStr, 16);
		return String.valueOf(in);
	}

测试代码

System.out.println(hexStrToIntStr("a"));
System.out.println(hexStrToIntStr("Aa"));
 
10
170

二、将 "15" 转化成 "f"的格式

public static String intStrToHexStr(String intStr) {
		// 不存在数据时 返回null
		if (intStr == null || intStr == "") {
			return null;
		}
		//进行转换操作
		StringBuffer Hex=new StringBuffer("");
        String m="0123456789abcdef";
        int i = Integer.parseInt(intStr, 10);
        if(i==0) Hex.append(i);
        while (i!=0) {
            Hex.append(m.charAt(i%16));
            i>>=4;
        }
        return Hex.reverse().toString();
	}

测试代码

System.out.println(intStrToHexStr("15"));
System.out.println(intStrToHexStr("170"));
 
f
aa

三、将 "01" 转化为  "0x01" 的样式

public static byte[] HexString2Bytes(String src) {
	        byte[] ret = new byte[src.length() / 2];
	        byte[] tmp = src.getBytes();
	        for (int i = 0; i < tmp.length / 2; i++) {
	            ret[i] = uniteBytes(tmp[i * 2], tmp[i * 2 + 1]);
	        }
	        return ret;
	    }
public static byte uniteBytes(byte src0, byte src1) {
	        byte _b0 = Byte.decode("0x" + new String(new byte[] { src0 }))
	                .byteValue();
	        _b0 = (byte) (_b0 << 4);
	        byte _b1 = Byte.decode("0x" + new String(new byte[] { src1 }))
	                .byteValue();
	        byte ret = (byte) (_b0 ^ _b1);
	        return ret;
	    }

四、将byte[]{0x01,0x11} 转化为 "0111" 格式输出

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();
		}

五、将byte[]{0,0} 转化为 "00"格式输出

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

六、java正则判断IMEI、MAC、IMSI信息

public static final String imsiRegex = "^[0-9]{15,16}$";
public static final String imeiRegex = "^[0-9]{15,17}$";
public static final String macRegex = "^([A-Fa-f0-9]{2}(-[A-Fa-f0-9]{2}){5})";
 
	/**
	* @param regex
	* 正则表达式字符串
	* @param str
	* 要匹配的字符串
	* @return 如果str 符合 regex的正则表达式格式,返回true, 否则返回 false;
	*/
	public static boolean match(String regex, String str) {
		Pattern pattern = Pattern.compile(regex);
		Matcher matcher = pattern.matcher(str);
		return matcher.matches();
	}