java 获取进程ID 物理内存 cpu使用百分比（linux环境）
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import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;import java.math.BigDecimal;import org.apache.log4j.Logger;import sun.management.ManagementFactory;import com.ailk.ts.message.bean.MonitorInfoBean;public class SystemInfoTools {final static boolean isNotWindows = System.getProperties().getProperty("os.name").toLowerCase().indexOf("windows") < 0;final static BigDecimal DIVISOR = BigDecimal.valueOf(1024);private final static Logger logger = Logger.getLogger(SystemInfoTools.class);public static int getPid(){return Integer.parseInt(ManagementFactory.getRuntimeMXBean().getName().split("@")[0]);}public static MonitorInfoBean getMonitorInfoBean() {MonitorInfoBean monitorInfo = new MonitorInfoBean();if(!isNotWindows){monitorInfo.setMemUsage(500);return monitorInfo;}Runtime rt = Runtime.getRuntime();BufferedReader in = null;try {int pid = getPid();String[] cmd = {"/bin/sh","-c","top -b -n 1 | grep " + pid};Process p = rt.exec(cmd);in = new BufferedReader(new InputStreamReader(p.getInputStream()));String str = null;String[] strArray = null;while ((str = in.readLine()) != null) {logger.debug("top: " + str);int m = 0;strArray = str.split(" ");for (int i = 0; i < strArray.length; i++) {String info = strArray[i];if (info.trim().length() == 0){continue;}if(m == 5) {//第5列为进程占用的物理内存值String unit = info.substring(info.length() - 1);if(unit.equalsIgnoreCase("g")) {monitorInfo.setMemUseSize(Double.parseDouble(info));} else if(unit.equalsIgnoreCase("m")) {BigDecimal memUseSize = new BigDecimal(info.substring(0, info.length() - 1));monitorInfo.setMemUseSize(memUseSize.divide(DIVISOR, 2, BigDecimal.ROUND_HALF_UP).doubleValue());} else {BigDecimal memUseSize = new BigDecimal(info).divide(DIVISOR);monitorInfo.setMemUseSize(memUseSize.divide(DIVISOR, 2, BigDecimal.ROUND_HALF_UP).doubleValue());}}if(m == 8) {//第9列为CPU的使用百分比monitorInfo.setCpuUsage(Double.parseDouble(info));}if(m == 9) {//第10列为内存的使用百分比monitorInfo.setMemUsage(Double.parseDouble(info));}m++;}}} catch (IOException e) {e.printStackTrace();} finally {try {in.close();} catch (IOException e) {e.printStackTrace();}} return monitorInfo;}}?
MonitorInfoBean.java
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public class MonitorInfoBean {/** cpu使用率 */private double cpuUsage;/** 内存使用率 */private double memUsage;/** 内存使用的大小 */private double memUseSize;public double getCpuUsage() {return cpuUsage;}public void setCpuUsage(double cpuUsage) {this.cpuUsage = cpuUsage;}public double getMemUsage() {return memUsage;}public void setMemUsage(double memUsage) {this.memUsage = memUsage;}public double getMemUseSize() {return memUseSize;}public void setMemUseSize(double memUseSize) {this.memUseSize = memUseSize;}}