J2SE进制间互相转换

最新推荐文章于 2022-02-25 19:38:17 发布

转载最新推荐文章于 2022-02-25 19:38:17 发布 · 841 阅读

文章标签：

#j2se #byte #string #hex #c #class

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1.byte16进制数转换10进制

	byte[] b = new byte[]{(byte)Integer.parseInt("af", 16),(byte)Integer.parseInt("03", 16),
			      (byte)Integer.parseInt("f2", 16),(byte)Integer.parseInt("03", 16)};
	int s = 0;
	s = (b[0] & 0xff);
	System.out.println(s);

2.字符串16进制数组转换int10进制数组

public class Test {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		 String[] number = new String[] { "01", "02", "04", "0f", "ff", "af" };
		 int[] con = new Test().convert(number);
		 for (int i : con) {
		 System.out.print(i + ",");
	}	

	}

	private int[] convert(String[] num) {
		int[] number = new int[num.length];

		for (int z = 0; z < num.length; z++) {
			String str = num[z];
			String myStr[] = { "a", "b", "c", "d", "e", "f" };
			int result = 0;
			int n = 1;
			for (int i = str.length() - 1; i >= 0; i--) {
				String param = str.substring(i, i + 1);
				for (int j = 0; j < myStr.length; j++) {
					if (param.equalsIgnoreCase(myStr[j])) {
						param = "1" + String.valueOf(j);
					}
				}
				result += Integer.parseInt(param) * n;
				n *= 16;
			}
			number[z] = result;
		}
		return number;
	}

}

3.java二进制,字节数组,字符,十六进制,BCD编码转换

// 整数到字节数组转换 
 public static byte[] int2bytes(int n) { 
  byte[] ab = new byte[4]; 
  ab[0] = (byte) (0xff & n); 
  ab[1] = (byte) ((0xff00 & n) >> 8); 
  ab[2] = (byte) ((0xff0000 & n) >> 16); 
  ab[3] = (byte) ((0xff000000 & n) >> 24); 
  return ab; 
 } 

 // 字节数组到整数的转换 
 public static int bytes2int(byte b[]) { 
  int s = 0; 
  s = ((((b[0] & 0xff) << 8 | (b[1] & 0xff)) << 8) | (b[2] & 0xff)) << 8 
    | (b[3] & 0xff); 
  return s; 
 } 

 // 字节转换到字符 
 public static char byte2char(byte b) { 
  return (char) b; 
 } 

 private final static byte[] hex = "0123456789ABCDEF".getBytes(); 

 private static int parse(char c) { 
  if (c >= 'a') 
   return (c - 'a' + 10) & 0x0f; 
  if (c >= 'A') 
   return (c - 'A' + 10) & 0x0f; 
  return (c - '0') & 0x0f; 
 } 

 // 从字节数组到十六进制字符串转换 
 public static String Bytes2HexString(byte[] b) { 
  byte[] buff = new byte[2 * b.length]; 
  for (int i = 0; i < b.length; i++) { 
   buff[2 * i] = hex[(b[i] >> 4) & 0x0f]; 
   buff[2 * i + 1] = hex[b[i] & 0x0f]; 
  } 
  return new String(buff); 
 } 

 // 从十六进制字符串到字节数组转换 
 public static byte[] HexString2Bytes(String hexstr) { 
  byte[] b = new byte[hexstr.length() / 2]; 
  int j = 0; 
  for (int i = 0; i < b.length; i++) { 
   char c0 = hexstr.charAt(j++); 
   char c1 = hexstr.charAt(j++); 
   b[i] = (byte) ((parse(c0) << 4) | parse(c1)); 
  } 
  return b; 
 }