import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException;public class MyFileUtils {    public static void xorDec(File srcfile,File desfile,byte xorchar) throws IOException{        FileInputStream fis = new FileInputStream(srcfile);        FileOutputStream fos = new FileOutputStream(desfile);                byte[] bs = new byte[1024];                int len = 0;        while((len = fis.read(bs))!= -1){                        for(int i = 0 ;i < len ;i++){                                bs[i]^=xorchar;                            }            fos.write(bs,0,len);                    }        fis.close();        fos.close();                    }    }