windows环境解决tomcat一闪而过的问题

1.首先，在cmd下，切换到startup.bat所在目录，然后命令行执行startup.bat，dos界面会给出错误提示

2.查看错误提示

3.根据错误提示，进行debug

4.例如，下面是我解决问题的思路：

a.我的报错信息为：

The JAVA_HOME environment variable is not defined correctly
This environment variable is needed to run this program（系统环境变量配置问题）

The CATALINA_HOME environment variable is not defined correctly
This environment variable is needed to run this program

b.找出为何会报这样的错误（我百度过，但是百度到的问题并不像是我所遇到的问题，虽然报错信息是一样的，但是出错的细节也许并不一定和你自己的完全一致，这就是为何无脑用百度的答案无法解决自己的问题的原因）

c.查看startup.bat文件内容（通过百度，尝试学习bat批处理命令是什么意思，逐渐理解startup.bat文件代码的意思）

    @echo off
    rem Licensed to the Apache Software Foundation (ASF) under one or more
    rem contributor license agreements.  See the NOTICE file distributed with
    rem this work for additional information regarding copyright ownership.
    rem The ASF licenses this file to You under the Apache License, Version 2.0
    rem (the "License"); you may not use this file except in compliance with
    rem the License.  You may obtain a copy of the License at
    rem
    rem     http://www.apache.org/licenses/LICENSE-2.0
    rem
    rem Unless required by applicable law or agreed to in writing, software
    rem distributed under the License is distributed on an "AS IS" BASIS,
    rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    rem See the License for the specific language governing permissions and
    rem limitations under the License.
     
    rem ---------------------------------------------------------------------------
    rem Start script for the CATALINA Server
    rem ---------------------------------------------------------------------------
     
    setlocal
     
    rem Guess CATALINA_HOME if not defined
    set "CURRENT_DIR=%cd%"
    if not "%CATALINA_HOME%" == "" goto gotHome
    set "CATALINA_HOME=%CURRENT_DIR%"
    if exist "%CATALINA_HOME%\bin\catalina.bat" goto okHome
    cd ..
    set "CATALINA_HOME=%cd%"
    cd "%CURRENT_DIR%"
    :gotHome
    rem 查看CATALINA_HOME变量
    echo %CATALINA_HOME%
    rem 查看当前目录
    echo %CURRENT_DIR%
    if exist "%CATALINA_HOME%\bin\catalina.bat" goto okHome
    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%\bin\catalina.bat"
     
    rem Check that target executable exists
    if exist "%EXECUTABLE%" goto okExec
    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=
    :setArgs
    if ""%1""=="""" goto doneSetArgs
    set CMD_LINE_ARGS=%CMD_LINE_ARGS% %1
    shift
    goto setArgs
    :doneSetArgs
     
    call "%EXECUTABLE%" start %CMD_LINE_ARGS%
     
    :end

通过打印变量，可以看到自己环境中的CATALINA_HOME

rem 查看CATALINA_HOME变量
echo %CATALINA_HOME%
rem 查看当前目录
echo %CURRENT_DIR%

如上图所示，现在出错原因很明了了。我很早以前在环境变量中配过CATALINA_HOME，后来忘掉了。重新配置一下即可。