A Linux Java program startup script __linux

#!/bin/sh
### BEGIN INIT INFO
# Provides:dastask
# Required-start: $ALL
# Required-stop: $ALL
# Default-start:2 3 4 5
# default-stop:0 1 6
# Short-description:start and Stop ORS
# Description:dastask ORS SERVER
### End INIT INFO
#该脚本为Linux下启动java程序的通用脚本. That can be invoked as a boot from service script,
#也可以作为启动java程序的独立脚本来使用.
#
#Author: Wuzhenzhong, DATE:2011/7/26
#
#警告!!! : The script Stop section uses the System Kill command to force the termination of the specified Java program process.
#在杀死进程前, no condition checks were made. In some cases, such as when a program is doing a file or database write operation,
#可能会造成数据丢失或数据不完整. If you have to consider this kind of situation, you need to overwrite this script,
#增加在执行kill命令前的一系列检查.
#
#
###################################
#环境变量及程序执行参数
#需要根据实际环境以及Java程序名称来修改这些参数
###################################
#JDK所在路径
Java_home= "/home/yuntest1/data/jdk16"

#执行程序启动所使用的系统用户, it is recommended that you do not use the root account for security reasons
Running_user=yuntest1

#Java程序所在的目录 (previous level of classes)
App_home=/home/yuntest1/data/agent

Export App_home
#需要启动的Java主程序 (Main method Class)
App_mainclass=com.talkyun.azalea.agent.startup

#拼凑完整的classpath参数, including all jars under the specified Lib directory
Classpath= $APP _home/bin
For i in "$APP _home"/lib/*.jar; Todo
Classpath= "$CLASSPATH": "$i"
Done


#java虚拟机启动参数
Java_opts= ""

###################################
# (function) to determine whether a program has been started
#
#说明:
#使用JDK自带的JPS命令及grep命令组合, accurate lookup pid
#jps plus l parameter to show the full package path for Java
#使用awk, split out PID (parts), and Java program name ($ part)
###################################
#初始化psid变量 (Global)
Psid=0

Checkpid () {
javaps= ' $JAVA _home/bin/jps-l | grep $APP _mainclass '

If [-N "$javaps"]; Then
Psid= ' echo $javaps | awk ' {print '} '
Else
Psid=0
Fi
}

###################################
# (function) Start program
#
#说明:
#1. First call the Checkpid function to refresh the $PSID global variable
#2. If the program is started ($psid is not equal to 0), the prompt program is started
#3. If the program is not started, execute the start command line
#4. Call the Checkpid function again after starting the command execution
#5. If the result of step 4 can confirm the PID of the program, print [OK], otherwise print [Failed]
#注意: Echo-n indicates that after printing characters, do not wrap lines
#注意: Use of "Nohup >/dev/null 2>&1 &"
###################################
Start () {
Checkpid

If [$psid-ne 0]; Then
echo "================================"
echo "warn: $APP _mainclass already started! (pid= $psid) "
echo "================================"
Else
Echo-n "Starting $APP _mainclass ..."
java_cmd= "Nohup $JAVA _home/bin/java $JAVA _opts-dapp_home= $APP _home-classpath $CLASSPATH $APP _mainclass >/dev/ Null 2>&1 & "
su-$RUNNING _user-c "$JAVA _cmd"
Checkpid
If [$psid-ne 0]; Then
echo "(pid= $psid) [OK]"
Else
echo "[Failed]"
Fi
Fi
}

###################################
# (function) Stop program
#
#说明:
#1. First call the Checkpid function to refresh the $PSID global variable
#2. If the program is started ($psid is not equal to 0), start the execution stop, otherwise the prompt program is not running
#3. Using the kill-9 PID command to force the kill process
#4. Follow the KILL command line immediately thereafter, and immediately view the return value of the previous command: $?
#5. If the result of step 4 is equal to 0, print [OK], otherwise print [Failed]
#6. To prevent Java programs from being started more than once, this increases the process of repeatedly checking, and repeatedly kills the processing (recursive call stop).
#注意: Echo-n indicates that after printing characters, do not wrap lines
#注意: In Shell programming, "$?" represents the return value of the previous command or a function
###################################
Stop () {
Checkpid

If [$psid-ne 0]; Then
Echo-n "Stopping $APP _mainclass ... (pid= $psid) "
su-$RUNNING _user-c "Kill-9 $psid"
If [$?-eq 0]; Then
echo "[OK]"
Else
echo "[Failed]"
Fi

Checkpid
If [$psid-ne 0]; Then
Stop
Fi
Else
echo "================================"
echo "warn: $APP _mainclass is not running"
echo "================================"
Fi
}

###################################
# (function) Check program running status
#
#说明:
#1. First call the Checkpid function to refresh the $PSID global variable
#2. If the program is started ($psid is not equal to 0), the prompt is running and represents the PID
#3. Otherwise, the prompt program is not running
###################################
Status () {
Checkpid

If [$psid-ne 0]; Then
echo "$APP _mainclass is running! (pid= $psid) "
Else
echo "$APP _mainclass is not running"
Fi
}

###################################
# (function) print system environment parameters
###################################
Info () {
echo "System Information:"
echo "****************************"
Echo ' Head-n 1/etc/issue '
Echo ' Uname-a '
Echo
echo "Java_home= $JAVA _home"
Echo ' $JAVA _home/bin/java-version '
Echo
echo "App_home= $APP _home"
echo "app_mainclass= $APP _mainclass"
echo "****************************"
}

###################################
#读取脚本的第一个参数 ($) to make a judgment
#参数取值范围: {Start|stop|restart|status|info}
#如参数不在指定范围之内, print help information
###################################
Case "$" in
' Start ')
Start
;;
' Stop ')
Stop
;;
' Restart ')
Stop
Start
;;
' Status ')
Status
;;
' Info ')
Info
;;
*)
echo "Usage: $ {Start|stop|restart|status|info}"
Exit 1
Esac
Exit 0