定時cronjob調用Java程序

一個部署在Linux環境的Java企業應用後台經常會在大半夜運行很多定時的任務，本篇文章總結下如何使用shell腳本調用Java程序，以備忘。

什麼時候Linux才能完美？ http://www.linuxidc.com/Linux/2014-09/107098.htm

1. setupenv.sh

export APP_HOME=`pwd`

if [ -z "$JAVA_HOME" ] ; then
  JAVA=`which java`
  if [ -z "$JAVA" ] ; then
    echo "Cannot find JAVA. Please set your PATH."
    exit 1
  fi
  JAVA_BIN=`dirname $JAVA`
  JAVA_HOME=$JAVA_BIN/..
fi

PATH_SEPARATOR=':'
if [ $OSTYPE = "cygwin32" ] ; then
  PATH_SEPARATOR=';'
fi
if [ $OSTYPE = "cygwin" ] ; then
  PATH_SEPARATOR=';'
fi
JAVA=$JAVA_HOME/bin/java

CLASSPATH=$JAVA_HOME/lib/tools.jar
CLASSPATH=`echo ${APP_HOME}/lib/*.jar | tr ' ' ${PATH_SEPARATOR}`${PATH_SEPARATOR}${CLASSPATH}
CLASSPATH=`echo ${APP_HOME}/lib/*.zip | tr ' ' ${PATH_SEPARATOR}`${PATH_SEPARATOR}${CLASSPATH}
CLASSPATH=`echo ${ANT_HOME}/lib/*.jar | tr ' ' ${PATH_SEPARATOR}`${PATH_SEPARATOR}${CLASSPATH}
CLASSPATH=`echo ${ANT_HOME}/lib/*.zip | tr ' ' ${PATH_SEPARATOR}`${PATH_SEPARATOR}${CLASSPATH}
CLASSPATH=${APP_HOME}/build/classes${PATH_SEPARATOR}${CLASSPATH}
export CLASSPATH

### load other variables from profile
source /etc/profile #set all env

2. app.sh

#!/bin/sh
# -----------------------------------------------------------------------------
# app.sh - Script to run applications
#
# Environment Variable Prequisites
#
#  APP_HOME (Optional) May point at your APP "build" directory.
#                If not present, the current working directory is assumed.
#  APP_OPTS (Optional) Java runtime options used when the "start",
#                "stop", or "run" command is executed.
#  JAVA_HOME    Must point at your Java Development Kit installation.
# -----------------------------------------------------------------------------

# ----- Checking JVM variables -------------------------
export JAVA_PARAM=$1
if [ "$JAVA_PARAM" = "-javaMax" ]
then
    shift
    export memoryX=$1
    shift
else
    export memoryX="1024"
fi

export JAVA_PARAM=$1
if [ "$JAVA_PARAM" = "-jmxHost" ]
then
    shift
    jmxHost=$1
    shift
fi

export JAVA_PARAM=$1
if [ "$JAVA_PARAM" = "-jmxPort" ]
then
    shift
    jmxPort=$1
    shift
fi

# fix env. issues
source /etc/profile

# ----- Verify and Set Required Environment Variables -------------------------
export LANG="en_US.UTF8"

    if [ -z "$APP_HOME" ] ; then
    ## resolve links - $0 may be a link to  home
    PRG=$0
    progname=`basename $0`
 
    while [ -h "$PRG" ] ; do
 ls=`ls -ld "$PRG"`
 link=`expr "$ls" : '.*-> \(.*\)$'`
    if expr "$link" : '.*/.*' > /dev/null; then
    PRG="$link"
 else
    PRG="`dirname $PRG`/$link"
 fi
    done
   
    APP_HOME_1=`dirname "$PRG"`/../..
    echo "Guessing APP_HOME from app.sh to ${APP_HOME_1}"
    if [ -d ${APP_HOME_1}/properties ] ; then
    APP_HOME=${APP_HOME_1}
    echo "Setting APP_HOME to $APP_HOME"
 fi
    fi
   
 if [ -z "$APP_OPTS" ] ; then
    APP_OPTS=""
    fi
   
 if [ -z "$JPDA_OPTS" ] ; then
    JPDA_OPTS="-Xdebug -Xnoagent -Xrunjdwp:transport=dt_socket,address=8000,server=y,suspend=n"
    fi
   
 if [ -z "$JAVA_HOME" ] ; then
 echo You must set JAVA_HOME to point at your Java Development Kit installation
    exit 1
fi
 

# ----- Cygwin Unix Paths Setup -----------------------------------------------

# Cygwin support.  $cygwin _must_ be set to either true or false.
case "`uname`" in
  CYGWIN*) cygwin=true ;;
  *) cygwin=false ;;
esac
 
# For Cygwin, ensure paths are in UNIX format before anything is touched
if $cygwin ; then
  [ -n "$APP_HOME" ] &&
    APP_HOME=`cygpath --unix "$APP_HOME"`
    [ -n "$JAVA_HOME" ] &&
    JAVA_HOME=`cygpath --unix "$JAVA_HOME"`
fi

# ----- Set Up The Classpath -------------------------------------------

CP=${APP_HOME}/build/classes

CP=`echo ${APP_HOME}/lib/*.jar | tr ' ' :`:${CP}
CP=`echo ${APP_HOME}/lib/*.zip | tr ' ' :`:${CP}
if [ -f "$JAVA_HOME/lib/tools.jar" ] ; then
  CP=$CP:"$JAVA_HOME/lib/tools.jar"
fi

# ----- Cygwin Windows Paths Setup --------------------------------------------

# convert the existing path to windows
if $cygwin ; then
  CP=`cygpath --path --windows "$CP"`
  APP_HOME=`cygpath --path --windows "$APP_HOME"`
  JAVA_HOME=`cygpath --path --windows "$JAVA_HOME"`
fi

# ----- Execute The Requested Command -----------------------------------------

echo "Using CLASSPATH:    $CP"
echo "Using APP_HOME: $APP_HOME"
echo "Using JAVA_HOME:    $JAVA_HOME"

JMX_OPTS=""

if [ "$jmxHost" != "" ]
then
    JMX_OPTS=" -Dcom.sun.management.jmxremote.authenticate=false -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote -Djava.rmi.server.hostname="$jmxHost
fi

if [ "$jmxPort" != "" ]
then
    JMX_OPTS=$JMX_OPTS" -Dcom.sun.management.jmxremote.port="$jmxPort
fi

export JAVA_OPTS="-verbosegc -XX:+PrintGCDetails -XX:+PrintTenuringDistribution"

JAVA_OPTS=$JAVA_OPTS" "-server" "-Xms256M" "-Xmx$memoryX"M "-XX:NewSize=128m" "-XX:MaxNewSize=128m" "-XX:+UseConcMarkSweepGC" "-Xconcurrentio" "-Xnoclassgc""
JAVA_OPTS=$JAVA_OPTS" "$JMX_OPTS

JAVA_OPTS=$JAVA_OPTS" "-DOracle.jdbc.V8Compatible=true

$JAVA_HOME/bin/java ${JAVA_OPTS} $APP_OPTS -classpath $CP -Dapp.base=$APP_BASE  -Dapp.home=$APP_HOME -Djava.library.path=$HOME/JMagick/lib $@

3. runMyJob.sh

#!/bin/sh
#=============================================================================
# Desc  : MyJob
# 00 03 * * * /home/app/src/scripts/runMyJob.sh 0 >> /home/app/runMyJob0.log 2>&1
#=============================================================================

export APP_HOME=$HOME/app
cd $HOME
. .bashrc
cd $APP_HOME
. setupenv.sh

LOCKFILE="$HOME/MyJob$1.lock";
CONCURRENT_WARNING="MyJob lock file found: $LOCKFILE \n Probably a previous job is still executing, please wait for a while and try again later. \n";
init_day=`date +%Y%m%d%H%M`;

logfile="$HOME/MyJob$1_$init_day.log";

if [ -f $LOCKFILE ]
then
    echo "$CONCURRENT_WARNING";
    exit 1;
fi

#create a lock file to prevent concurrent job requests
touch $LOCKFILE

echo ">>>>>START at `date`"
echo ">>> execute the business ...."
$APP_HOME/src/scripts/app.sh -javaMax 2049 com.zdp.MyJob $1 >> $logfile 2>&1
echo ">>> $1 ....  "

#gzip log file
gzip $logfile;

#move the log to the logs directory
cd $HOME
mv $logfile.gz $HOME/logs/

# remove lock file
rm -rf $LOCKFILE

echo ">>>>> END at `date`"

4. Java程序：MyJob.java

package com.zdp;

public class MyJob {
    private static String MODE = "0";
 public static void main(String args[]) throws Exception {
  try {
   System.out.println("----------------- START -----------------");
   long begin = System.currentTimeMillis();
   if (args.length > 0) {
    MODE = args[0];
   }
   
   // main logic
   
   long end = System.currentTimeMillis();
   System.out.println("<<<<<<<<<<<<<<<<<<<<  Total spent time: " + (end - begin) / 1000 + "s  >>>>>>>>>>>>>>>>>>>>");
   System.out.println("----------------- END -------------------");
  } catch (Exception e) {
   logger.error(e.getMessage(), e);
   System.exit(1);
  } finally{
   System.exit(0);
  }
 }
 
}