java中16进制互转 ByteUtil.java

﹏ヽ暗。殇╰゛Y 2022-07-24 03:25 259阅读 0赞

/** * 字节处理工具类 * * @author sun.jun * @serial * @since 2012-8-15 上午10:31:24 */
    	public class ByteUtil { 
    	
    		/** * 字节数组转16进制字符串 * * @param b * 字节数组 * @return 16进制字符串 */
    		public static String byte2hex(byte[] b) { 
    			StringBuffer hs = new StringBuffer();
    			String stmp;
    			for (int i = 0; i < b.length; i++) { 
    				stmp = Integer.toHexString(b[i] & 0xFF);
    				if (stmp.length() == 1) { 
    					hs.append("0").append(stmp);
    				} else { 
    					hs.append(stmp);
    				}
    			}
    			return hs.toString();
    		}
    	
    		/** * 16进制字符串转字节数组 * * @param hex * 16进制字符串 * @return 字节数组 */
    		public static byte[] hex2byte(String hex) { 
    			if (!isHexString(hex)) { 
    				return null;
    			}
    			char[] arr = hex.toCharArray();
    			byte[] b = new byte[hex.length() / 2];
    			for (int i = 0, j = 0, l = hex.length(); i < l; i++, j++) { 
    				String swap = "" + arr[i++] + arr[i];
    				int byteint = Integer.parseInt(swap, 16) & 0xFF;
    				b[j] = new Integer(byteint).byteValue();
    			}
    			return b;
    		}
    	
    		/** * 校验是否是16进制字符串 * * @param hex * @return */
    		public static boolean isHexString(String hex) { 
    			if (hex == null || hex.length() % 2 != 0) { 
    				return false;
    			}
    			for (int i = 0; i < hex.length(); i++) { 
    				char c = hex.charAt(i);
    				if (!isHexChar(c)) { 
    					return false;
    				}
    			}
    			return true;
    		}
    	
    		/** * 校验是否是16进制字符 * * @param c * @return */
    		private static boolean isHexChar(char c) { 
    			return (c >= '0' && c <= '9') || (c >= 'A' && c <= 'F') || (c >= 'a' && c <= 'f');
    		}
    	
    	}