在jsp页面中调用Java类
我需要你们的帮助,伙计们,我有一个JAVA类,它允许监控来自中央处理器(CPU)的数据,我需要调用或显示JAVA类的输出到JSP或SERVLET网页中在jsp页面中调用Java类,java,jsp,Java,Jsp,我需要你们的帮助,伙计们,我有一个JAVA类,它允许监控来自中央处理器(CPU)的数据,我需要调用或显示JAVA类的输出到JSP或SERVLET网页中 package cpudata; import java.math.BigInteger; import java.util.Random; import org.hyperic.sigar.CpuInfo; import org.hyperic.sigar.Cpu
package cpudata;
import java.math.BigInteger;
import java.util.Random;
import org.hyperic.sigar.CpuInfo;
import org.hyperic.sigar.CpuPerc;
import org.hyperic.sigar.ProcCpu;
import org.hyperic.sigar.Sigar;
import org.hyperic.sigar.SigarException;
/**
*
* @author alsadig
*/
public class CpuData {
private static Sigar sigar;
public CpuData(Sigar s) throws SigarException {
sigar = s;
System.out.println(cpuInfo());
}
public static void main(String[] args) throws InterruptedException, SigarException {
new CpuData(new Sigar());
CpuData.startMetricTest();
}
private static void startMetricTest() throws InterruptedException, SigarException {
new Thread() {
public void run() {
while(true)
BigInteger.probablePrime(MAX_PRIORITY, new Random());
};
}.start();
while(true) {
String pid = ""+sigar.getPid();
System.out.print(getMetric(pid));
for(Double d:getMetric()){
System.out.print("\t"+d);
}
System.out.println();
Thread.sleep(1000);
}
}
public String cpuInfo() throws SigarException {
CpuInfo[] infos = sigar.getCpuInfoList();
CpuInfo info = infos[0];
String infoString = info.toString();
if ((info.getTotalCores() != info.getTotalSockets())
|| (info.getCoresPerSocket() > info.getTotalCores())) {
infoString+=" Physical CPUs: " + info.getTotalSockets();
infoString+=" Cores per CPU: " + info.getCoresPerSocket();
}
long cacheSize = info.getCacheSize();
if (cacheSize != Sigar.FIELD_NOTIMPL) {
infoString+="Cache size...." + cacheSize;
}
return infoString;
}
public static Double[] getMetric() throws SigarException {
CpuPerc cpu = sigar.getCpuPerc();
double system = cpu.getSys();
double user = cpu.getUser();
double idle = cpu.getIdle();
return new Double[] {system, user, idle};
}
public static double getMetric(String pid) throws SigarException {
ProcCpu cpu = sigar.getProcCpu(pid);
return cpu.getPercent();
}
}
从JSP调用Java代码的方法有很多: 首先:从Scriptlet调用方法(不是好方法): 在yourJSP.jsp中:
${yourData}
Third:使用page指令在JSP上导入类,并实例化它并调用方法,如下所示:
<%@page import="com.example.MyUtility"%>
<%
MyUtility obj = new MyUtility ();
obj.methodToCall();
%>
您可以创建对象并调用此类的适当方法。
${yourData}
<%@page import="com.example.MyUtility"%>
<%
MyUtility obj = new MyUtility ();
obj.methodToCall();
%>