得到指定進程的運行時間

【前言】被某個網上的人噁心了一下，希望他已經不要到此處，更不要留下什麼污言雜語。不歡迎！

 

【正文】實現要點

 

1. java調用shell命令（ps），並處理命令的返回結果

 

2. ps -ef | grep manager | grep -v grep | awk '{print $2}'  可以得到manager進程的PID

 

注意，這裏會有一個問題，grep manager會將一些帶有manager關鍵字的其他進程也找出來，導致錯誤，稍微正確一些的是：

 

ps -ef | grep 'manager$' | grep -v grep | awk '{print $2}' 

 

用正則表達式限制一下要以manager結尾

 

3. ps -o etime -p [pid] 可以得到指定pid的進程的已經運行的時間

 

注意，在HP和HPAT機型上，需要設置環境變量UNIX95=1才能使用ps -o選項。其他（Linux、SUN、IBM）上不需要設置該環境變量。

 

package org.snmp4j.agent.uvcagent; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; public class ScpState { private static Log agentLog = Log.getInstance(); /** * 調用GetScpPid判斷manager的pid是否存在 * */ public static boolean isScpRun() { //調用GetScpState得到SCP的pid String scpPid = GetScpPid(); if (scpPid.compareToIgnoreCase("") != 0) { //如果pid不爲空，說明manager在運行 //true表示SCP運行 agentLog.getLog().debug("Manager is running"); return true; } //false表示SCP不運行 agentLog.getLog().debug("Manager is not running"); return false; } /** * 通過ps -ef | grep manager | awk '{print $2}' * 得到manager的pid * * 如果pid不爲空，說明manager是在運行的 */ public static String GetScpPid() { String scpPid = ""; Runtime rt = Runtime.getRuntime(); //shell命令 String str[] = {"/bin/sh", "-c","ps -ef | grep manager | grep -v grep |awk '{print $2}'"}; //String str[] = {""}; Process pcs; try { agentLog.getLog() .debug("Run shell: ps -ef | grep manager | grep -v grep |awk '{print $2}'"); pcs = rt.exec(str); BufferedReader br = new BufferedReader(new InputStreamReader( pcs.getInputStream())); //得到shell的執行結果 scpPid = br.readLine(); //當manager沒有運行時，得到shell的返回值的，所以這裏要特殊處理一下 if(scpPid == null) { scpPid = ""; } agentLog.getLog().debug("Get Pid of Manager: " + scpPid); try { pcs.waitFor(); } catch (InterruptedException e) { agentLog.getLog() .error("Get InterruptedException: processes was interrupted"); } br.close(); pcs.exitValue(); } catch (IOException e1) { agentLog.getLog().debug("Get IOException!"); // TODO Auto-generated catch block e1.printStackTrace(); } return scpPid; } /** * 通過ps -o etime -p [mangaer pid] * 得到magager的運行時間 * * 重點在etime * * HP和HPAT上需要先設置環境變量 UNIX95=1才能使用-o選項。 */ public static long GetScpRunTime(String Pid) { String str2[] = {"/bin/sh", "-c", "ps -o etime -p " + Pid}; String scpRunTime = ""; Runtime rt = Runtime.getRuntime(); Process pcs2; try { System.out.println("ps -o etime -p " + Pid); agentLog.getLog().debug("Run shell: ps -o etime -p " + Pid); pcs2 = rt.exec(str2); BufferedReader br = new BufferedReader(new InputStreamReader( pcs2.getInputStream())); //當manager進程只有一個時，該命令應該返回兩行，第二行是etime的時間 String line = new String(); while ((line = br.readLine()) != null) { scpRunTime = line.trim(); } agentLog.getLog().debug("Get RunTime of Manager: " + scpRunTime); try { pcs2.waitFor(); } catch (InterruptedException e) { agentLog.getLog() .error("Get InterruptedException: processes was interrupted"); } br.close(); pcs2.exitValue(); } catch (IOException e1) { agentLog.getLog().debug("Get IOException!"); // TODO Auto-generated catch block e1.printStackTrace(); } //轉換etime的時間格式，爲毫秒 return ChangeTimeFormat(scpRunTime); } /** * 轉換etime的時間格式[[dd-]hh:]mm:ss * 爲毫秒 */ public static long ChangeTimeFormat(String etimeFormat) { String day = ""; String hour = ""; String minuter = ""; String second = ""; String tempEtimeFormat = etimeFormat; if (etimeFormat.indexOf("-") != -1) { day = etimeFormat.substring(0, etimeFormat.indexOf("-")); //tempEtimeFormat爲[hh:]mm:ss tempEtimeFormat = etimeFormat.substring(etimeFormat.indexOf("-") + 1, etimeFormat.length()); } //從etimeFormat中得到秒 second = tempEtimeFormat.substring(tempEtimeFormat.lastIndexOf(":") + 1, tempEtimeFormat.length()); tempEtimeFormat = tempEtimeFormat.substring(0, tempEtimeFormat.lastIndexOf(":")); minuter = tempEtimeFormat.substring(tempEtimeFormat.lastIndexOf(":") + 1, tempEtimeFormat.length()); if (tempEtimeFormat.lastIndexOf(":") != -1) { tempEtimeFormat = tempEtimeFormat.substring(0, tempEtimeFormat.lastIndexOf(":")); hour = tempEtimeFormat; } Long dayLong = new Long(0); Long hourLong = new Long(0); Long mimuterLong = new Long(0); Long secondLong = new Long(0); if (day.compareTo("") != 0) { dayLong = Long.valueOf(day); } if (hour.compareTo("") != 0) { hourLong = Long.valueOf(hour); } mimuterLong = Long.valueOf(minuter); secondLong = Long.valueOf(second); //以毫秒爲單位 long scpRunTime = dayLong.longValue() * 24 * 60 * 60 * 1000 + hourLong.longValue() * 60 * 60 * 1000 + mimuterLong.longValue() * 60 * 1000 + secondLong.longValue() * 1000; agentLog.getLog().debug("Change time to millisecond: " + scpRunTime); return scpRunTime; } public static void main(String args[]) { if(isScpRun()) { System.out.println("Manger is running"); String pid = GetScpPid(); System.out.println("Pid is: " + pid); long time = GetScpRunTime(pid); System.out.println("Time is: " + time); } else { System.out.println("Manger is not running"); } } }