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);
}
}

}