升级Tomcat版本 apache-tomcat-7.0.77
diff --git a/tomcat-cas/webapps/examples/servlets/sessions.html b/tomcat-cas/webapps/examples/servlets/sessions.html
index 65fc7fd..febef83 100644
--- a/tomcat-cas/webapps/examples/servlets/sessions.html
+++ b/tomcat-cas/webapps/examples/servlets/sessions.html
@@ -24,7 +24,7 @@
 <p><font color="#0000FF"><a href="servlet/SessionExample"><img src="images/execute.gif" align="right" border="0"></a><a href="index.html"><img src="images/return.gif" width="24" height="24" align="right" border="0"></a></font></p>
 <h3>Source Code for Session Example<font color="#0000FF"><br>
   </font> </h3>
-<font color="#0000FF"></font> 
+<font color="#0000FF"></font>
 <pre><font color="#0000FF">import</font> java.io.*;
 <font color="#0000FF">import</font> java.util.*;
 <font color="#0000FF">import</font> javax.servlet.*;
@@ -37,7 +37,7 @@
     {
         response.setContentType("<font color="#009900">text/html</font>");
         PrintWriter out = response.getWriter();
-        
+
         HttpSession session = request.getSession(true);
 
         <font color="#CC0000">// print session info</font>