integrated oOo's memory usage patch (the % shown is unfortunately % of peak, not % of max) [thanks oOo!]

cleaned up build script to make sure we always build fresh JSPs and xml [thanks oOo^2!]

apps/routerconsole/java/build.xml

@@ -28,10 +28,13 @@
     </target>
     <target name="war" depends="precompilejsp">
         <war destfile="build/routerconsole.war" webxml="../jsp/web-out.xml"
-             basedir="../jsp/" excludes="web.xml, *.java, *.jsp">
+             basedir="../jsp/" excludes="web.xml, *.java, *.jsp, web-fragment.xml">
         </war>
     </target>
     <target name="precompilejsp">
+        <delete dir="../jsp/WEB-INF/" />
+        <delete dir="../jsp/web-fragment.xml" />
+        <delete dir="../jsp/web-out.xml" />
         <mkdir dir="../jsp/WEB-INF/" />
         <mkdir dir="../jsp/WEB-INF/classes" />
         <!-- there are various jspc ant tasks, but they all seem a bit flakey -->

apps/routerconsole/java/src/net/i2p/router/web/SummaryHelper.java

@@ -64,6 +64,17 @@ public class SummaryHelper {
         else
             return DataHelper.formatDuration(router.getUptime());
     }
+
+        
+    /**
+     * Retrieve amount of used memory.
+     *
+     */
+    public String getMemory() {
+        long used = (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory())/1024;
+        long usedPc = 100 - ((Runtime.getRuntime().freeMemory() * 100) / Runtime.getRuntime().totalMemory());
+        return used + "KB (" + usedPc + "%)"; 
+    }
     
     /**
      * How many active peers the router has.

apps/routerconsole/jsp/summary.jsp

@@ -7,6 +7,7 @@
  <b>Ident:</b> <jsp:getProperty name="helper" property="ident" /><br />
  <b>Version:</b> <jsp:getProperty name="helper" property="version" /><br />
  <b>Uptime:</b> <jsp:getProperty name="helper" property="uptime" /><br />
+ <b>Memory:</b> <jsp:getProperty name="helper" property="memory" /><br />
  <hr />
  
  <u><b>Peers</b></u><br />