正则表达式的问题
<%@ page contentType= "text/html;charset=utf-8 "%>
<%@ page import= "java.util.regex.Matcher "%>
<%@ page import= "java.util.regex.Pattern "%>
<%
String url = "/xp/admin.do;session=234234?p=init ";
Pattern p = Pattern.compile( "xp ");
Matcher m = p.matcher(url);
if(m.find()){
m.replaceAll( "# ");
}
out.println( " <br> "+url);
%>
以上是小弟的代码～想把url中的xp替换成#，为什么替换不了？请大大不吝指教

[解决办法]
if(m.find()){
url = m.replaceAll( "# ");
}