得到指定进程的运行时间

http://blog.csdn.net/j00152685/archive/2010/11/25/6036169.aspx

 

【正文】实现要点

1. java调用shell命令（ps），并处理命令的返回结果

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

注意，这里会有一个问题，grep manager会将一些带有manager关键字的其他进程也找出来，导致错误，稍微正确一些的是：

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

用正则表达式限制一下要以manager结尾

3. ps -o etime -p [pid] 可以得到指定pid的进程的已经运行的时间

注意，在HP和HPAT机型上，需要设置环境变量UNIX95=1才能使用ps -o选项。其他（Linux、SUN、IBM）上不需要设置该环境变量。

 

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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();            /**      * 调用GetScpPid判断manager的pid是否存在      *       */      public static boolean isScpRun()      {          //调用GetScpState得到SCP的pid          String scpPid = GetScpPid();                    if (scpPid.compareToIgnoreCase("") != 0)          {              //如果pid不为空，说明manager在运行              //true表示SCP运行                            agentLog.getLog().debug("Manager is running");              return true;          }                    //false表示SCP不运行          agentLog.getLog().debug("Manager is not running");                    return false;      }            /**      * 通过ps -ef | grep manager | awk '{print $2}'      * 得到manager的pid      *       * 如果pid不为空，说明manager是在运行的      */      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的执行结果              scpPid = br.readLine();                            //当manager没有运行时，得到shell的返回值的，所以这里要特殊处理一下              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;                }            /**      * 通过ps -o etime -p [mangaer pid]      * 得到magager的运行时间      *       * 重点在etime      *       * HP和HPAT上需要先设置环境变量 UNIX95=1才能使用-o选项。      */      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()));                            //当manager进程只有一个时，该命令应该返回两行，第二行是etime的时间              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();          }                    //转换etime的时间格式，为毫秒          return ChangeTimeFormat(scpRunTime);      }            /**      * 转换etime的时间格式[[dd-]hh:]mm:ss      * 为毫秒      */      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为[hh:]mm:ss              tempEtimeFormat = etimeFormat.substring(etimeFormat.indexOf("-") + 1,                      etimeFormat.length());                        }                    //从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);                    //以毫秒为单位          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");          }                                    }  }