private static String setString(byte[] bytes_str) {
String new_str;
try {
new_str = new String(bytes_str, "UTF-8");
}
catch(Exception e) {
new_str = new String(bytes_str);
}
return new_str;
}
public static String decStr(byte[] enStrBytes, int decFlag, int encode) {
byte[] decstrArray;
int enstrLen;
if(enStrBytes == null) {
return "decode error";
}
if (decFlag == 0 || enStrBytes.length == 0) {
return setString(enStrBytes);
}
if(decFlag == 1) {
enstrLen = enStrBytes.length;
decstrArray = new byte[enstrLen];
byte bEncode = ((byte)encode);
for (int i = 0;i < enstrLen;i++) {
decstrArray[i] = ((byte)(bEncode ^ enStrBytes[i]));
bEncode = decstrArray[i];
}
return setString(decstrArray);
}
if(decFlag == 2) {
enstrLen = enStrBytes.length;
decstrArray = new byte[enstrLen];
String coprightString = "Copyright (c) 1993, 2015, Oracle and/or its affiliates. All rights reserved. ";
int index = 0;
for (int i = 0;i < enstrLen;i++) {
decstrArray[i] = ((byte)(enStrBytes[i] ^ (((byte)coprightString.charAt(index)))));
index = (index + 1) % coprightString.length();
}
return setString(decstrArray);
}
return "decode error";
} 
