sigar使用：在web中应用sigar取得系统信息

最新推荐文章于 2019-01-07 09:23:55 发布

最新推荐文章于 2019-01-07 09:23:55 发布 · 288 阅读

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#Web #Java #Servlet #JSP #XML

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本文介绍了一个使用Sigar库的Servlet应用，该应用能够实时获取并显示系统的CPU使用率、内存使用情况及交换分区信息。通过部署SigarServlet，可以在浏览器中直接查看服务器的资源占用状态。

直接看代码：


import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.hyperic.sigar.Cpu;
import org.hyperic.sigar.CpuPerc;
import org.hyperic.sigar.Mem;
import org.hyperic.sigar.Sigar;
import org.hyperic.sigar.Swap;

public class SigarServlet extends HttpServlet {

	public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

		try {
			Sigar sigar = new Sigar();
			CpuPerc perc = sigar.getCpuPerc();
			Mem mem = sigar.getMem();
			Swap swap = sigar.getSwap();

			int cpuUsage = (int)perc.getCombined();
			int memFree = (int)(mem.getFree()/(1024l*1024l));
			int memTotal = (int)(mem.getTotal()/(1024l*1024l));

			int pageFileFree = (int)(swap.getPageOut()/(1024l*1024l));
			int pageFileTotal = (int)(swap.getPageIn()/(1024l*1024l));
			int swapFree = (int)(swap.getFree()/(1024l*1024l));
			int swapTotal = (int)(swap.getTotal()/(1024l*1024l));


			response.setContentType("text/html;charset=GB2312");
			PrintWriter out = response.getWriter();

			Cpu cpu = sigar.getCpu();

			out.println("CPU Usage："+perc.getCombined());
			out.println("<br/>");
			out.println("Memory Free："+memFree);
			out.println("<br/>");
			out.println("Memory Total："+memTotal);
			out.println("<br/>");
			out.println("Swap Free："+swapFree);
			out.println("<br/>");
			out.println("Swap Total："+swapTotal);
			out.println("<br/>");
			out.println("Page Free："+pageFileFree);
			out.println("<br/>");
			out.println("Page Total："+pageFileTotal);

			out.close();

		} catch (Exception e) {

		}
	}

}

配置：


<?xml version="1.0" encoding="UTF-8"?>
<web-app id="WebApp_ID" version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
	<display-name>sigar</display-name>
	<servlet>
	   <servlet-name>sigarServlet</servlet-name>
	   <servlet-class>sigar.SigarServlet</servlet-class>
	</servlet>

	<servlet-mapping>
	    <servlet-name>sigarServlet</servlet-name>
	    <url-pattern>/sigar</url-pattern>
	</servlet-mapping>

	<welcome-file-list>
		<welcome-file>index.html</welcome-file>
		<welcome-file>index.htm</welcome-file>
		<welcome-file>index.jsp</welcome-file>
		<welcome-file>default.html</welcome-file>
		<welcome-file>default.htm</welcome-file>
		<welcome-file>default.jsp</welcome-file>
	</welcome-file-list>
</web-app>

需要的jar：
.sigar_shellrc
pdh.dll
sigar-1.5.0.1.jar
sigar-x86-winnt.dll
sigar-x86-winnt.lib

测试结果：

访问http://127.0.0.1:8080/sigar/sigar

CPU Usage：0.22815533980582525
Memory Free：863
Memory Total：2046
Swap Free：2048
Swap Total：4330
Page Free：0
Page Total：0

测试系统：windows Vista

注意其他系统需要引入sigar相关的库文件，具体看看sigar的网站：[url]http://hyperic-hq.sourceforge.net/[/url]