java中两个16进制字符串异或

java中，两个16进制的字符串异或，经常用于加密机加解密当中 ，具体异或的方法如下：
package com.foxconn;
import java.text.ParseException;


public class Aa {
private static String hexStr = "0123456789ABCDEF";
public static void main(String args[]) throws ParseException{

String code1 = encode("9CE00K00781065");
String code2 = encode("TOX$123FTOX$321");
System.out.println(code1);
System.out.println(code2);
System.out.println("7F0C1D14017903767F6814010203");

String result ="";
for(int i=0; i char c1 = code1.charAt(i);
char c2 = code2.charAt(i);
String a = convertHexToBinary(c1+"");
String b = convertHexToBinary(c2+"");
byte [] aa = a.getBytes();
byte [] bb = b.getBytes();
String cc ="";
for( int j = 0;j cc += aa[j]^bb[j];
}
String tmp =Integer.toHexString(Integer.valueOf(cc,2).intValue()).toString();

result +=tmp;
}
}

public static String convertHexToBinary(String hexString){
long l = Long.parseLong(hexString, 16);
String binaryString = Long.toBinaryString(l);
int shouldBinaryLen = hexString.length()*4;
StringBuffer addZero = new StringBuffer();
int addZeroNum = shouldBinaryLen-binaryString.length();
for(int i=1;i<=addZeroNum;i++){
addZero.append("0");
}
return addZero.toString()+binaryString;
}

public static String encode(String str) {
// 根据默认编码获取字节数组
byte[] bytes = str.getBytes();
String strs = "";
// 将字节数组中每个字节拆解成2位16进制整数
for (int i = 0; i < bytes.length; i++) {
//取得高四位
strs += hexStr.charAt((bytes[i] & 0xf0) >> 4);
// System.out.println(i+"--"+bytes[i]+"----"+(bytes[i] & 0xf0)+"----"+hexString.charAt((bytes[i] & 0xf0) >> 4)+"---"+hexString.charAt((bytes[i] & 0x0f) >> 0));
//取得低四位
strs += hexStr.charAt((bytes[i] & 0x0f) >> 0);
}
return strs;
}
}