Java類型轉換工具類（十六進制—bytes互轉、十進制—十六進制互轉，String—Double互轉）

/** * 數據類型轉換工具類 * @author cyf * */
public class NumConvertUtil{ /** * bytes 轉16進制字符串 * @param bArray * @return
     */
    public static final String bytesToHexString(byte[] bArray) { StringBuffer sb = new StringBuffer(bArray.length); String sTemp; for (int i = 0; i < bArray.length; i++) { sTemp = Integer.toHexString(0xFF & bArray[i]); if (sTemp.length() < 2) sb.append(0); sb.append(sTemp.toUpperCase()); } return sb.toString(); } /** * 16進制字符串轉bytes * @param hex * @return
     */
    public static byte[] hexStringToByte(String hex) { int len = 0; int num=0; //判斷字符串的長度是不是兩位
        if(hex.length()>=2){ //判斷字符喜歡是不是偶數
            len=(hex.length() / 2); num = (hex.length() % 2); if (num == 1) { hex = "0" + hex; len=len+1; } }else{ hex = "0" + hex; len=1; } 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 int toByte(char c) { if (c >= 'a') return (c - 'a' + 10) & 0x0f; if (c >= 'A') return (c - 'A' + 10) & 0x0f; return (c - '0') & 0x0f; } /** * 16進制字符串轉十進制int * @param HexString * @return
     */
    public static int HexStringToInt(String HexString) { int inJTFingerLockAddress = Integer.valueOf(HexString, 16); return inJTFingerLockAddress; } /** * 十進制int轉16進制字符串 * @param HexString * @return
     */
    public static String IntToHexString(int num) { String hexString = Integer.toHexString(num); return hexString; } /** * 16進制String轉BCD * @param asc * @return
     */
    public static byte[] strToBcd(String asc) { int len = asc.length(); int mod = len % 2; if (mod != 0) { asc = "0" + asc; len = asc.length(); } byte abt[] = new byte[len]; if (len >= 2) { len = len / 2; } byte bbt[] = new byte[len]; abt = asc.getBytes(); int j, k; for (int p = 0; p < asc.length()/2; p++) { if ( (abt[2 * p] >= '0') && (abt[2 * p] <= '9')) { j = abt[2 * p] - '0'; } else if ( (abt[2 * p] >= 'a') && (abt[2 * p] <= 'z')) { j = abt[2 * p] - 'a' + 0x0a; } else { j = abt[2 * p] - 'A' + 0x0a; } if ( (abt[2 * p + 1] >= '0') && (abt[2 * p + 1] <= '9')) { k = abt[2 * p + 1] - '0'; } else if ( (abt[2 * p + 1] >= 'a') && (abt[2 * p + 1] <= 'z')) { k = abt[2 * p + 1] - 'a' + 0x0a; }else { k = abt[2 * p + 1] - 'A' + 0x0a; } int a = (j << 4) + k; byte b = (byte) a; bbt[p] = b; } return bbt; } /** * String 類型數字轉化爲Double 保留置頂小數位(用於顯示金額等。) * @param money * @param type 保留小數點位數 #.00保留兩位 #.0保留一位 #保留整數 * @return
     */
    public static String strToDouble(String money,String type){ String toDouble= new DecimalFormat(type).format(Double.parseDouble(money)); return toDouble; } }

十六進制字符串高低位轉換（「dc45fd45」轉化成「45fd45dc」）

private static String lockAddress(String lockAddress) {
			
			StringBuffer s1 = new StringBuffer(lockAddress);
			int index;
			for (index = 2; index < s1.length(); index += 3) {
				s1.insert(index, ',');
			}
			String[] array = s1.toString().split(",");
			String[] swapOrder = swapOrder(array);
			StringBuffer s2 = new StringBuffer();
			for (String string :swapOrder ) {
				s2.append(string);
		}
		    return s2.toString();
			
		}
		
		
		 public static String[] swapOrder(String[] arr){ 
			 int length = arr.length;
			 for(int i=0;i<length/2;i++){ //只需一個循環，數組的一半就能夠，第一個和最後一個交換，第二個和倒數第二個交換。。。
				 String temp = arr[i];
				 arr[i] = arr[length-1-i];
				 arr[length-1-i] = temp;
				 } 
			 return arr;
			 }
	
		

	public static void main(String[] args) throws Exception {
		
		
		System.out.println(ServerDoor.lockAddress("dc45fd45"));
		//輸出結果：45fd45dc

	}

 

 

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