jvm의 힙(heap)사이즈 출력

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<meta http-equiv="Refresh" content="1;url=heap.jsp">
<%Runtime rt = Runtime.getRuntime();%>
JVM의 메모리<br>Runtime class 의 heap이용 </br>
<table border='1'>
    <tr><td>Total size</td>
    <td><%=rt.totalMemory()%></td></tr>
    <tr><td>free size</td>
    <td><%=rt.freeMemory()%></td></tr>
    <tr><td>Heap size</td>
    <td><%=rt.totalMemory()-rt.freeMemory()%></td></tr>
</table>