利用shell脚本个性化运行jar任务

利用shell脚本可以个性化运行jar任务，废话不多说，直接上代码：

#!/bin/bash
APP_PATH=/root/bigdata/jars/data_migration_from_sqlserver
APP_NAME=data_migration_from_sqlserver.jar

usage() {
    echo "case: sh run.sh [start|stop|restart|status]"
    exit 1
}

# 判断当前服务是否已经启动的函数
is_exist(){
	#根据ps命令查询当前服务的进程号赋值给pid"
    pid=`ps -ef|grep $APP_NAME|grep -v grep|awk '{print $2}' `
    if [ -z "${pid}" ]; then
        # pid等于null
        return 1
    else
        # pid不等于null
        return 0
    fi
}

start(){
    is_exist
	# [$? -eq "0"] 说明pid不等于空,说明服务正在运行中,将进程号打印出来
    if [ $? -eq "0" ]; then
        echo "${APP_NAME} is running. Pid=${pid}"
    else
	cd ${APP_PATH}
        # nohup java -jar $APP_NAME > log.file 2>log.error &  # 说明pid为空 执行java -jar 命令启动服务
	nohup java -jar $APP_NAME >/dev/null 2>./log/log.error &
	is_exist
	echo "${APP_NAME} started. Pid=${pid}"
    fi
}

stop(){
    is_exist
	# [$? -eq "0"] 说明pid不等于空 说明服务正在运行中,将进程号杀死
    if [ $? -eq "0" ]; then
        kill -9 $pid
        echo "${APP_NAME} stopped. Pid=${pid}"
    else
        echo "${APP_NAME} is not running"
    fi
}

status(){
    is_exist
    if [ $? -eq "0" ]; then
        echo "${APP_NAME} is running. Pid is ${pid}"
    else
        echo "${APP_NAME} is not running"
    fi
}

# 重启命令其实就是先执行关闭命令,再执行重启命令
restart(){
    stop
    start
}

# 这里的$1取的是当前输入命令的第二个参数start(sh start.sh start)
case "$1" in
    "start")
        start
        ;;
    "stop")
        stop
        ;;
    "status")
        status
        ;;
    "restart")
        restart
        ;;
    *)
    usage
    ;;
esac