java对二进制与字符串转换

先记录下，以后要用，直接取

 

package test;

import java.util.StringTokenizer;

public class StrToByte {
public static String byte2hex(byte[] b) // 二进制转字符串
{
   String hs = "";
   String stmp = "";
   for (int n = 0; n < b.length; n++) {
    stmp = (java.lang.Integer.toHexString(b[n] & 0XFF));
    if (stmp.length() == 1)
     hs = hs + "0" + stmp;
    else
     hs = hs + stmp;
   }
   return hs;
}

public static byte[] hex2byte(String str) { // 字符串转二进制
   if (str == null)
    return null;
   str = str.trim();
   int len = str.length();
   if (len == 0 || len % 2 == 1)
    return null;

   byte[] b = new byte[len / 2];
   try {
    for (int i = 0; i < str.length(); i += 2) {
     b[i / 2] = (byte) Integer
       .decode("0x" + str.substring(i, i + 2)).intValue();
    }
    return b;
   } catch (Exception e) {
    return null;
   }
}

public static void main(String[] args) {
   String str = "absadfawegsdcd";
   String result = "";
   result = byte2hex(str.getBytes());
   System.out.println(result);
   System.out.println(new String(hex2byte(result)));
}
}