js java escape和unescape函数
class? EscapeUnescape{?public static String? escape (String src)?{??int i;??char j;??StringBuffer tmp = new StringBuffer();??tmp.ensureCapacity(src.length()*6);
??for (i=0;i<src.length() ;i++ )??{
???j = src.charAt(i);
???if (Character.isDigit(j) || Character.isLowerCase(j) || Character.isUpperCase(j))????tmp.append(j);???else????if (j<256)????{????tmp.append( "%" );????if (j<16)?????tmp.append( "0" );????tmp.append( Integer.toString(j,16) );????}????else????{????tmp.append( "%u" );????tmp.append( Integer.toString(j,16) );????}??}??return tmp.toString();?}
?public static String? unescape (String src)?{??StringBuffer tmp = new StringBuffer();??tmp.ensureCapacity(src.length());??int? lastPos=0,pos=0;??char ch;??while (lastPos<src.length())??{???pos = src.indexOf("%",lastPos);???if (pos == lastPos)????{????if (src.charAt(pos+1)=='u')?????{?????ch = (char)Integer.parseInt(src.substring(pos+2,pos+6),16);?????tmp.append(ch);?????lastPos = pos+6;?????}????else?????{?????ch = (char)Integer.parseInt(src.substring(pos+1,pos+3),16);?????tmp.append(ch);?????lastPos = pos+3;?????}????}???else????{????if (pos == -1)?????{?????tmp.append(src.substring(lastPos));?????lastPos=src.length();?????}????else?????{?????tmp.append(src.substring(lastPos,pos));?????lastPos=pos;?????}????}??}??return tmp.toString();?}
?public static void main(String[] args) ?{??String tmp="~!@#$%^&*()_+|\\=-,./?><;'][{}"";??System.out.println("testing escape : "+tmp);??tmp =escape(tmp);??System.out.println(tmp);??System.out.println("testing unescape :"+tmp);??System.out.println(unescape(tmp));?}}
