📄 cache_jvm.jsp
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<%@ page contentType="text/html; charset=utf-8" language="java" import="java.sql.*" errorPage="" %>
<%@ page import="java.util.*,
java.text.*"
%>
<jsp:useBean id="StrUtil" scope="page" class="cn.js.fan.util.StrUtil"/>
<!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">
<link href="../common.css" rel="stylesheet" type="text/css">
<link href="default.css" rel="stylesheet" type="text/css">
<title>查看java虚拟机内存</title>
</head>
<body>
<table cellSpacing="0" cellPadding="0" width="100%">
<tbody>
<tr>
<td align="left" class="head">系统信息</td>
</tr>
</tbody>
</table>
<jsp:useBean id="privilege" scope="page" class="cn.js.fan.module.pvg.Privilege"/>
<%
if (!privilege.isUserPrivValid(request, "forum.plugin"))
{
out.print(cn.js.fan.web.SkinUtil.makeErrMsg(request, cn.js.fan.web.SkinUtil.LoadString(request, "pvg_invalid")));
return;
}
%>
<br>
<TABLE
style="BORDER-RIGHT: #a6a398 1px solid; BORDER-TOP: #a6a398 1px solid; BORDER-LEFT: #a6a398 1px solid; BORDER-BOTTOM: #a6a398 1px solid"
cellSpacing=0 cellPadding=3 width="95%" align=center>
<!-- Table Head Start-->
<TBODY>
<TR>
<TD width="70%" align="left" noWrap class=thead style="PADDING-LEFT: 10px"><font size="-1"><b>Java VM （Java虚拟机）内存</b></font> </TD>
</TR>
<TR class=row style="BACKGROUND-COLOR: #fafafa">
<TD height="175" align="center" style="PADDING-LEFT: 10px"><p>
<p>
<%!
static final DecimalFormat mbFormat = new DecimalFormat("#0.00");
static final DecimalFormat percentFormat = new DecimalFormat("#0.0");
static final int NUM_BLOCKS = 50;
%>
<%
String op = request.getParameter("op");
if (op==null)
op = "";
// The java runtime
Runtime runtime = Runtime.getRuntime();
if (op.equals("gc")) {
runtime.gc();
out.println("<p><font size=-1 color=red> 垃圾已收集</font></p>");
}
double freeMemory = (double)runtime.freeMemory()/(1024*1024);
double totalMemory = (double)runtime.totalMemory()/(1024*1024);
double maxMemory = Runtime.getRuntime().maxMemory()/(1024*1024);
double usedMemory = totalMemory - freeMemory;
double percentFree = ((double)freeMemory/(double)totalMemory)*100.0;
int free = 100-(int)Math.round(percentFree);
%>
<ul><table width="277" border=0>
<tr>
<td width="135"><font size="-1">已用内存:</font></td>
<td width="132"><font size="-1"><%= mbFormat.format(usedMemory) %> MB</font></td>
</tr>
<tr>
<td><font size="-1">内存总量:</font></td>
<td><font size="-1"><%= mbFormat.format(totalMemory) %> MB</font></td>
</tr>
<tr>
<td><font size="-1">最大内存</font></td>
<td><font size="-1"><%= mbFormat.format(maxMemory) %> MB</font></td>
</tr>
<tr>
<td><font size="-1">处理器数</font></td>
<td><font size="-1"><%=runtime.availableProcessors()%> 个</font></td>
</tr>
</table>
<br>
<table border=0>
<td><table bgcolor="#000000" cellpadding="1" cellspacing="0" border="0" width="200" align=left>
<td><table bgcolor="#000000" cellpadding="1" cellspacing="1" border="0" width="100%">
<% for (int i=0; i<NUM_BLOCKS; i++) {
if ((i*(100/NUM_BLOCKS)) < free) {
%>
<td bgcolor="#00ff00" width="<%= (100/NUM_BLOCKS) %>%"><img src="images/blank.gif" width="1" height="15" border="0"></td>
<% } else { %>
<td bgcolor="#006600" width="<%= (100/NUM_BLOCKS) %>%"><img src="images/blank.gif" width="1" height="15" border="0"></td>
<% }
}
%>
</table></td>
</table></td>
<td><font size="-1"> <b><%= percentFormat.format(percentFree) %>% 空闲</b> </font> </td>
</table>
<br>
<table width="200" border="0" cellspacing="0" cellpadding="0">
<tr>
<td align="center">>> <font size="-1"><a href="cache_jvm.jsp?op=gc">垃圾收集</a></font> <font size="-1"><a href="cache_jvm.jsp">刷新</a></font> <<</td>
</tr>
<tr>
<td height="48" align="center"><font size="-1">注意垃圾收集器是低线程级的，不能被强制执行</font></td>
</tr>
</table>
</ul>
<% // Destroy the runtime reference
runtime = null;
%>
</TD>
</TR>
<!-- Table Body End -->
<!-- Table Foot -->
<TR>
<TD class=tfoot align=right><DIV align=right> </DIV></TD>
</TR>
<!-- Table Foot -->
</TBODY>
</TABLE>
<p>
</body>
</html>
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