startup

if "%OS%" == "Windows_NT" setlocal //判断当前系统是否是window系统

rem --------------------------------------------------------------------------- //rem 是注释（下同）

rem Start script for the CATALINA Server

rem

rem $Id: startup.bat 302918 2004-05-27 18:25:11Z yoavs $

rem ---------------------------------------------------------------------------

rem Guess CATALINA_HOME if not defined

set CURRENT_DIR=%cd% //设置当前目录

if not "%CATALINA_HOME%" == "" gotogotHome //如果设置了CATALINA_HOME环境变量 ，就直接到下面的gotHome处

set CATALINA_HOME=%CURRENT_DIR% //如果没有设置CATALINA_HOME，就设置CATALINA_HOME为当前目录（其实这里她假设你进入tomcat的安装目录）

if exist "%CATALINA_HOME%incatalina.bat" gotookHome//判断一下catalina.bat是否找到了，找到了就直接到下面的gotHome处

cd .. //这里他是假设你开始已经进入到了tomcat的bin目录，所以就退到上一级目录

set CATALINA_HOME=%cd%//现在再设置CATALINA_HOME为tomcat的安装目录

cd %CURRENT_DIR% //这里是进入dos的当前目录

:gotHome

if exist "%CATALINA_HOME%incatalina.bat" gotookHome //再次判断catalina.bat是否找到了，找到了就直接到下面的okHome处，没有的话，就只能提示你啦！

echo The CATALINA_HOME environment variable is not defined correctly

echo This environment variable is needed to run this program

goto end

:okHome

set EXECUTABLE=%CATALINA_HOME%incatalina.bat //设置要执行的文件

rem Check that target executable exists

if exist "%EXECUTABLE%" gotookExec //再次判断catalina.bat是否找到了，找到了就直接到下面的okExec处，没有的话，就提示。

echo Cannot find %EXECUTABLE%

echo This file is needed to run this program

goto end

:okExec

rem Get remaining unshifted command line arguments and save them in the

set CMD_LINE_ARGS= //这里是设置参数

:setArgs

if ""%1""=="""" gotodoneSetArgs //判断参数是否加入完成

set CMD_LINE_ARGS=%CMD_LINE_ARGS% %1 //将参数组成一行，接在后面

shift

gotosetArgs

:doneSetArgs

call "%EXECUTABLE%" start %CMD_LINE_ARGS% //执行catalina.bat，最好将这行改为:echo "%EXECUTABLE%" start %CMD_LINE_ARGS% 以便阅读、理解本文件的作用

:end