小編也是被網上一堆配置JDK環境變量給坑了，環境變量幹嘛的？我的理解就是給系統一個路徑在Dos窗口執行命令時讓系統知道該去什麼地方搜索對應的命令文件。具體查看百度“環境變量”
我說說我的環境變量配置如下我安裝的jdk9.0.1在jdk目錄下沒有jre目錄而是分開在同一個目錄下的，我的JDK，JRE安裝目錄都是默認的文件位子如下：
我在系統環境變量中分別配置了JAVA_HOME和JRE_HOME
JAVA_HOME C:\Program Files\Java\jdk-9.0.1 //jdk的目錄
JRE_HOME C:\Program Files\Java\jre-9.0.1 //jre的目錄
CLASSPATH .;%JAVA_HOME%\lib //可執行包所在目錄
path中增加兩條 %JAVA_HOME%\bin; 和 %JRE_HOME%\bin; //可執行文件搜索目錄
讀者可以自己查詢百度瞭解JAVA_HOME、JRE_HOME、CLASSPATH、path的具體作用。
之後我們回到Tomcat自啓動配置我們在cmd命令行執行Service.bat
（1）在cmd中進入Tomcat目錄bin目錄，執行service.bat install Tomcat
很多人在此處會遇到錯誤如下:
The JAVA_HOME environment variable is not defined correctly
This environment variable is needed to run this program
NB: JAVA_HOME should point to a JDK not a JRE
我們打開service.bat查看，修改以下特殊標註幾處“這網站有毒標紅幾處變成了web的<span style="color:#009900;">這個玩意兒，我和客服反映過幾次了沒什麼卵用~~~~”
@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 NT Service Install/Uninstall script
rem
rem Options
rem install Install the service using Tomcat9 as service name.
rem Service is installed using default settings.
rem remove Remove the service from the System.
rem
rem name (optional) If the second argument is present it is considered
rem to be new service name
rem ---------------------------------------------------------------------------
rem set JRE_HOME=C:\Program Files\Java\jre-9.0.1 //可選修改，如果沒有在環境變量添加JRE_HOME可在此處設置，同時還有設置setclasspath.bat裏面
//做相應的修改，去掉修改前的"rem"註釋的意思
setlocal
set "SELF=%~dp0%service.bat"
rem Guess CATALINA_HOME if not defined
set "CURRENT_DIR=%cd%"
if not "%CATALINA_HOME%" == "" goto gotHome
set "CATALINA_HOME=%cd%"
if exist "%CATALINA_HOME%\bin\tomcat9.exe" goto okHome
rem CD to the upper dir
cd ..
set "CATALINA_HOME=%cd%"
:gotHome
if exist "%CATALINA_HOME%\bin\tomcat9.exe" goto okHome
echo The tomcat9.exe was not found...
echo The CATALINA_HOME environment variable is not defined correctly.
echo This environment variable is needed to run this program
goto end
:okHome
rem Make sure prerequisite environment variables are set
if not "%JAVA_HOME%" == "" goto gotJdkHome
if not "%JRE_HOME%" == "" goto gotJreHome
echo Neither the JAVA_HOME nor the JRE_HOME environment variable is defined
echo Service will try to guess them from the registry.
goto okJavaHome
:gotJreHome
if not exist "%JRE_HOME%\bin\java.exe" goto noJavaHome //檢查此處是否正確
if not exist "%JRE_HOME%\bin\javaw.exe" goto noJavaHome //檢查此處是否正確
goto okJavaHome
:gotJdkHome
rem if not exist "%JAVA_HOME%\bin\java.exe" goto noJavaHome //檢查此處是否正確
rem if not exist "%JAVA_HOME%\bin\javaw.exe" goto noJavaHome //檢查此處是否正確
rem if not exist "%JAVA_HOME%\javac.exe" goto noJavaHome //檢查此處是否正確
if not "%JRE_HOME%" == "" goto okJavaHome
set "JRE_HOME=%JRE_HOME%"
goto okJavaHom
:noJavaHome
echo The JAVA_HOME environment variable is not defined correctly
echo This environment variable is needed to run this program
echo NB: JAVA_HOME should point to a JDK not a JRE
goto end
:okJavaHome
if not "%CATALINA_BASE%" == "" goto gotBase
set "CATALINA_BASE=%CATALINA_HOME%"
:gotBase
set "EXECUTABLE=%CATALINA_HOME%\bin\tomcat9.exe"
rem Set default Service name
set SERVICE_NAME=Tomcat9
set DISPLAYNAME=Apache Tomcat 9.0 %SERVICE_NAME%
if "x%1x" == "xx" goto displayUsage
set SERVICE_CMD=%1
shift
if "x%1x" == "xx" goto checkServiceCmd
:checkUser
if "x%1x" == "x/userx" goto runAsUser
if "x%1x" == "x--userx" goto runAsUser
set SERVICE_NAME=%1
set DISPLAYNAME=Apache Tomcat 9.0 %1
shift
if "x%1x" == "xx" goto checkServiceCmd
goto checkUser
:runAsUser
shift
if "x%1x" == "xx" goto displayUsage
set SERVICE_USER=%1
shift
runas /env /savecred /user:%SERVICE_USER% "%COMSPEC% /K \"%SELF%\" %SERVICE_CMD% %SERVICE_NAME%"
goto end
:checkServiceCmd
if /i %SERVICE_CMD% == install goto doInstall
if /i %SERVICE_CMD% == remove goto doRemove
if /i %SERVICE_CMD% == uninstall goto doRemove
echo Unknown parameter "%SERVICE_CMD%"
:displayUsage
echo.
echo Usage: service.bat install/remove [service_name] [/user username]
goto end
:doRemove
rem Remove the service
echo Removing the service '%SERVICE_NAME%' ...
echo Using CATALINA_BASE: "%CATALINA_BASE%"
"%EXECUTABLE%" //DS//%SERVICE_NAME% ^
--LogPath "%CATALINA_BASE%\logs"
if not errorlevel 1 goto removed
echo Failed removing '%SERVICE_NAME%' service
goto end
:removed
echo The service '%SERVICE_NAME%' has been removed
goto end
:doInstall
rem Install the service
echo Installing the service '%SERVICE_NAME%' ...
echo Using CATALINA_HOME: "%CATALINA_HOME%"
echo Using CATALINA_BASE: "%CATALINA_BASE%"
echo Using JAVA_HOME: "%JAVA_HOME%"
echo Using JRE_HOME: "%JRE_HOME%"
rem Try to use the server jvm
set "JVM=%JRE_HOME%\bin\server\jvm.dll"
if exist "%JVM%" goto foundJvm
rem Try to use the client jvm
set "JVM=%JRE_HOME%\bin\client\jvm.dll"
if exist "%JVM%" goto foundJvm
echo Warning: Neither 'server' nor 'client' jvm.dll was found at JRE_HOME.
set JVM=auto
:foundJvm
echo Using JVM: "%JVM%"
set "CLASSPATH=%CATALINA_HOME%\bin\bootstrap.jar;%CATALINA_BASE%\bin\tomcat-juli.jar"
if not "%CATALINA_HOME%" == "%CATALINA_BASE%" set "CLASSPATH=%CLASSPATH%;%CATALINA_HOME%\bin\tomcat-juli.jar"
if "%SERVICE_STARTUP_MODE%" == "" set SERVICE_STARTUP_MODE=manual
if "%JvmMs%" == "" set JvmMs=128
if "%JvmMx%" == "" set JvmMx=256
"%EXECUTABLE%" //IS//%SERVICE_NAME% ^
--Description "Apache Tomcat 9.0.1 Server - http://tomcat.apache.org/" ^
--DisplayName "%DISPLAYNAME%" ^
--Install "%EXECUTABLE%" ^
--LogPath "%CATALINA_BASE%\logs" ^
--StdOutput auto ^
--StdError auto ^
--Classpath "%CLASSPATH%" ^
--Jvm "%JVM%" ^
--StartMode jvm ^
--StopMode jvm ^
--StartPath "%CATALINA_HOME%" ^
--StopPath "%CATALINA_HOME%" ^
--StartClass org.apache.catalina.startup.Bootstrap ^
--StopClass org.apache.catalina.startup.Bootstrap ^
--StartParams start ^
--StopParams stop ^
--JvmOptions "-Dcatalina.home=%CATALINA_HOME%;-Dcatalina.base=%CATALINA_BASE%;-Djava.io.tmpdir=%CATALINA_BASE%\temp;-Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager;-Djava.util.logging.config.file=%CATALINA_BASE%\conf\logging.properties;%JvmArgs%" ^
--Startup "%SERVICE_STARTUP_MODE%" ^
--JvmMs "%JvmMs%" ^
--JvmMx "%JvmMx%"
if not errorlevel 1 goto installed
echo Failed installing '%SERVICE_NAME%' service
goto end
:installed
echo The service '%SERVICE_NAME%' has been installed.
:end
cd "%CURRENT_DIR%"
教程有不完善之處希望大家指正。