【经验篇】Java WEB应用如何重启Tomcat

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前言

Java Web应用中如何执行脚本重启Tomcat服务，包含两部分：启停脚本、调用Java代码。

启停脚本

tomcat.sh

#!/bin/sh
#
# -----------------------------------------------------------------------------
# description: Auto-starts tomcat
# Author: ZCQ
# -----------------------------------------------------------------------------
#
# -----------------------------------------------------------------------------
# Environment Variable Prerequisites
#
#   TOMCAT_HOME   May point at your Catalina "build" directory.
#
#   JAVA_HOME       Must point at your Java Development Kit installation.
#                   Required to run the with the "debug" argument.
# -----------------------------------------------------------------------------

# The Return Value
RETVAL=0
# The Operator
user=`whoami`
# SHUTDOWN_WAIT is wait time in seconds for java process to stop
SHUTDOWN_WAIT=5
# The Key Word
key_word="org.apache.catalina.startup.Bootstrap"

# 取出脚本名
cmd="`echo $0 | sed -e 's/^.*\///'`"
echo "**$cmd executed by $user"

# -----------------------------------------------------------------------------
# Check The Enviroment Vair TOMCAT_HOME
# -----------------------------------------------------------------------------
function check_env()
{
    if [ -z $TOMCAT_HOME ];then
    	echo -e "\n\e[31;1;5mThe Enviroment Vair TOMCAT_HOME is not exists.\e[0m\n"
	return 1
    fi
    return 0
}

# -----------------------------------------------------------------------------
# Get PID Of Tomcat
# -----------------------------------------------------------------------------
tomcat_pid()
{
    echo $(ps -fu $user | grep $key_word | grep $user | grep -v grep | awk '{print $2}')
}

# -----------------------------------------------------------------------------
# Start Script for the CATALINA Server
# -----------------------------------------------------------------------------
start()
{
    # Get The PID Of Tomcat
    pid=$(tomcat_pid)
    # The Process is already exists.
    if [ -n "$pid" ];
    then
	echo -e "\n\e[31;1;5mTomcat is running now (pid: $pid)\e[0m\n"
	echo -e "\e[32;1mPlease Stop Servers and try again!\e[0m\n"
	RETVAL=5
    else
	[ -z $TOMCAT_HOME ] || RETVAL=5
    	[ -f $TOMCAT_HOME/bin/startup.sh ] || RETVAL=5
	[ -x $TOMCAT_HOME/bin/startup.sh ] || RETVAL=5

	echo -e "\e[35;1m-------------------------------  Starting Tomcat Server  -----------------------------------\e[0m\n"
	$TOMCAT_HOME/bin/startup.sh
	RETVAL=$?
	echo -e "\e[35;1m--------------------------------------------------------------------------------------------\e[0m\n"
    fi

    return $RETVAL
}

# -----------------------------------------------------------------------------
# Stop script for the CATALINA Server
# -----------------------------------------------------------------------------
stop()
{
    [ -z $TOMCAT_HOME ] || RETVAL=5
    [ -f $TOMCAT_HOME/bin/shutdown.sh ] || RETVAL=5
    [ -x $TOMCAT_HOME/bin/shutdown.sh ] || RETVAL=5

    # Get The PID Of Tomcat
    pid=$(tomcat_pid)
    if [ -n "$pid" ];
    then
	echo -e "\e[35;1m---------------------------  Stoping Tomcat Server  --------------------------------\e[0m\n"
        $TOMCAT_HOME/bin/shutdown.sh
        RETVAL=$?

	let kwait=$SHUTDOWN_WAIT
	count=0
	until [ `ps -p $pid | grep -c $pid` = '0' ] || [ $count -gt $kwait ]
	do
	    echo -n -e "\e[00;31mWaiting for Processes to exit..\e[00m\n"
	    sleep 1
	    let count=$count+1
	done

	if [ $count -gt $kwait ]
	then
	    echo -e "\n\e[00;31mForce killing processes with 'kill -9 $pid' after $SHUTDOWN_WAIT seonds\e[00m\n"
	    kill -9 $pid
	fi
	echo -e "\e[35;1m-------------------------------------------------------------------------------------\e[0m\n"
    else
        echo -e "\n\e[00;31mTomcat is not running!\e[00m\n"
    fi

    return $RETVAL
}

# -----------------------------------------------------------------------------
# View the CATALINA Server Status
# -----------------------------------------------------------------------------
status()
{
    # Get The PID Of Tomcat
    pid=$(tomcat_pid)
    if [ -n "$pid" ];
    then
	echo -e "\n\e[32;1mTomcat is running with pid: $pid\e[0m\n"
    else
        echo -e "\n\e[00;31mTomcat is not running!\e[00m\n"
    fi
}

# 命令使用方式回显
function usage {
	if [ -n "$*" ]; then
		echo -e "\n\033[35m Unkown command: \033[0m \033[41;30m $* \033[0m\n"
	else
		echo -e "\n\033[35m The $cmd Lack Of Parameter.\033[0m\n"
	fi
	echo "[usage]: $cmd -v      : for System Version Info."
	echo "[usage]: $cmd start   : for Start System."
	echo "[usage]: $cmd stop    : for Stop System."
	echo "[usage]: $cmd status  : for System Status"
	echo "[usage]: $cmd restart : for Restart System."
	echo "[usage]: $cmd blank/? : for help"
	echo ""
	exit 0
}

case "$1" in
  start)
    start
    ;;
  stop)
    stop
    ;;
  status)
    status
    ;;
  restart)
    # fork 以子进程的方式执行
    exec $TOMCAT_HOME/bin/restart.sh &> restart_tomcat.log 2>&1 &
    ;;
  *)
    usage $*
esac

RETVAL=$?
echo "$0 execute successfully on `hostname` at `date '+%Y-%m-%d %H:%M:%S'`."
exit $RETVAL

子脚本

restart.sh

#!/bin/sh
sh $TOMCAT_HOME/bin/tomcat.sh stop
sh $TOMCAT_HOME/bin/tomcat.sh start

Java代码

LinuxServerUtil.java

public static void restartTomcatServer() {
		// 获取Tomcat路径
		String tomcatHome = getTomcatHome(LinuxServerUtil.class.getResource("/").getFile());
		
		// 重启tomcat指令
		final String restartSh = "sh " + tomcatHome + "/bin/tomcat.sh restart";
		logger.info("调用指令【{}】进行Tomcat重启", restartSh);
		new Thread(new Runnable() {
			
			@Override
			public void run() {
				try {
					Runtime.getRuntime().exec(restartSh);
				} catch (IOException e) {
					logger.error("执行重启tomcat服务出现异常。",e);
				}
			}
		}).start();
	}

使用方式

• 将tomcat.sh、restart.sh放入$TOMCAT_HOME/bin目录下
• 配置环境变量$TOMCAT_HOME