查看内存堆栈

这个页面放在tomcat/webapps/ROOT/下可以查看内存堆栈，对于分析定位性能问题，很有效果

<%@ page contentType="text/html;charset=UTF-8" language="java" pageEncoding="UTF-8"%>
<%@ page import="java.util.Set"%>
<%@ page import="java.util.Map"%>
<%@ page import="java.util.Iterator"%>
<%
	if("127.0.0.1".equals(request.getRemoteHost()))
	{
		Map<Thread,StackTraceElement[]> threads = Thread.getAllStackTraces();
		Set keys = threads.keySet();
		Iterator iter = keys.iterator();
		while (iter.hasNext())
		{
			Thread t = (Thread)iter.next();
%>
=======================================================================
ID: <%=t.getId()%>
State: <%=t.getState()%>
<%= "\n"%>
<%
			StackTraceElement[] trace = threads.get(t);
			for(int i = 0 ;i < trace.length;i++)
			{
%>
<%= trace[i].toString()%>
<%= "\n"%>
<%
			}
		}
	}
%>

如果不是本地测试，请将 if("127.0.0.1".equals(request.getRemoteHost()))分支去掉，使用浏览器访问该页面，然后通过查看源文件查看内存堆栈情况