JVM虚拟机内存量详细显示--JSP网页版

来源：互联网发布：java阿里在线编程题编辑：程序博客网时间：2024/04/29 01:39
<%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>JVM memory</title></head><body><%double total = (Runtime.getRuntime().totalMemory()) / (1024.0 * 1024);double max = (Runtime.getRuntime().maxMemory()) / (1024.0 * 1024);double free = (Runtime.getRuntime().freeMemory()) / (1024.0 * 1024);int totalInt = (int)total;int maxInt = (int)max;int freeInt = (int)free;int realnum = (int)(max - total + free);out.println("Java 虚拟机试图使用的最大内存量(当前JVM的最大可用内存)maxMemory():  <span style='font-size:24px;color:red'>" + maxInt + "</span>  MB<br/><br/>");out.println("Java 虚拟机中的内存总量(当前JVM占用的内存总数)totalMemory():  <span style='font-size:24px;color:red'>" + totalInt + "</span>  MB<br/><br/>");out.println("Java 虚拟机中的空闲内存量(当前JVM空闲内存)freeMemory():  <span style='font-size:24px;color:red'>" + freeInt + "</span>  MB<br/><br/>");out.println("因为JVM只有在需要内存时才占用物理内存使用，所以freeMemory()的值一般情况下都很小，<br/><br/>而JVM实际可用内存并不等于freeMemory()，而应该等于 maxMemory()-totalMemory()+freeMemory()。<br/><br/>");out.println("JVM实际可用内存:  <span style='font-size:24px;color:red'>" + realnum + "</span>  MB");%></body></html>
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