深入刨析tomcat 之---第12篇 how tomcat works( 第17章 ) 解析catalina.bat 梳理启动流程
我们如何启动tomcat呢? 答案是双击startup.bat文件,这个文件在bin目录下
@echo off 不显示批处理命令
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
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rem
rem http://www.apache.org/licenses/LICENSE-2.0
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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.
if "%OS%" == "Windows_NT" setlocal
rem ---------------------------------------------------------------------------
rem Start script for the CATALINA Server
rem
rem $Id: startup.bat 743401 2009-02-11 17:01:58Z markt $
rem ---------------------------------------------------------------------------
rem Guess CATALINA_HOME if not defined
if not "%CATALINA_HOME%" == "" goto gotHome
set CATALINA_HOME=.
if exist "%CATALINA_HOME%incatalina.bat" goto okHome
set CATALINA_HOME=..
:gotHome
if exist "%CATALINA_HOME%incatalina.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%incatalina.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 //如果第一个参数为" ",就是 在命令行敲入startup 命令;如果让%1不得"""" ,那么就这样输入 startup start
set CMD_LINE_ARGS=%CMD_LINE_ARGS% %1 如果有参数CMD_LINE_ARGS 变量的值为 参数1的值
shift
goto setArgs
:doneSetArgs
call "%EXECUTABLE%" start %CMD_LINE_ARGS% 最终的命令为 bincatalina.bat start
:end
以上批处理文件执行完成就变为了一句话,就是 在cmd 窗口中打 bincatalina.bat start
那么接着执行catalina 批处理
set CATALINA_OPTS=%CATALINA_OPTS% -Dsun.io.useCanonCaches=false
rem Guess CATALINA_HOME if not defined
if not "%CATALINA_HOME%" == "" goto gotHome
set CATALINA_HOME=.
if exist "%CATALINA_HOME%incatalina.bat" goto okHome
set CATALINA_HOME=..
:gotHome
if exist "%CATALINA_HOME%incatalina.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
rem Get standard environment variables
if exist "%CATALINA_HOME%insetenv.bat" call "%CATALINA_HOME%insetenv.bat"
rem Get standard Java environment variables
if exist "%CATALINA_HOME%insetclasspath.bat" goto okSetclasspath
echo Cannot find %CATALINA_HOME%insetclasspath.bat
echo This file is needed to run this program
goto end
:okSetclasspath
set BASEDIR=%CATALINA_HOME%
call "%CATALINA_HOME%insetclasspath.bat"
rem Add on extra jar files to CLASSPATH
if "%JSSE_HOME%" == "" goto noJsse
set CLASSPATH=%CLASSPATH%;%JSSE_HOME%libjcert.jar;%JSSE_HOME%libjnet.jar;%JSSE_HOME%libjsse.jar
:noJsse
set CLASSPATH=%CLASSPATH%;%CATALINA_HOME%inootstrap.jar
if not "%CATALINA_BASE%" == "" goto gotBase
set CATALINA_BASE=%CATALINA_HOME%
:gotBase
if not "%CATALINA_TMPDIR%" == "" goto gotTmpdir
set CATALINA_TMPDIR=%CATALINA_BASE% emp
:gotTmpdir
rem ----- Execute The Requested Command ---------------------------------------
echo Using CATALINA_BASE: %CATALINA_BASE%
echo Using CATALINA_HOME: %CATALINA_HOME%
echo Using CATALINA_TMPDIR: %CATALINA_TMPDIR%
echo Using JAVA_HOME: %JAVA_HOME%
set _EXECJAVA=%_RUNJAVA%
set MAINCLASS=org.apache.catalina.startup.Bootstrap
set ACTION=start
set SECURITY_POLICY_FILE=
set DEBUG_OPTS=
set JPDA=
echo Using _EXECJAVA %_EXECJAVA%
if not ""%1"" == ""jpda"" goto noJpda
set JPDA=jpda
if not "%JPDA_TRANSPORT%" == "" goto gotJpdaTransport
set JPDA_TRANSPORT=dt_shmem
:gotJpdaTransport
if not "%JPDA_ADDRESS%" == "" goto gotJpdaAddress
set JPDA_ADDRESS=jdbconn
:gotJpdaAddress
shift
:noJpda
echo print 参数1 ""%1""
if ""%1"" == ""debug"" goto doDebug
if ""%1"" == ""embedded"" goto doEmbedded
if ""%1"" == ""run"" goto doRun
if ""%1"" == ""start"" goto doStart
if ""%1"" == ""stop"" goto doStop
echo Usage: catalina ( commands ... )
echo commands:
echo debug Start Catalina in a debugger
echo debug -security Debug Catalina with a security manager
echo embedded Start Catalina in embedded mode
echo jpda start Start Catalina under JPDA debugger
echo run Start Catalina in the current window
echo run -security Start in the current window with security manager
echo start Start Catalina in a separate window
echo start -security Start in a separate window with security manager
echo stop Stop Catalina
goto end
:doDebug
shift
set _EXECJAVA=%_RUNJDB%
set DEBUG_OPTS=-sourcepath "%CATALINA_HOME%....jakarta-tomcat-4.0catalinasrcshare"
if not ""%1"" == ""-security"" goto execCmd
shift
echo Using Security Manager
set SECURITY_POLICY_FILE=%CATALINA_BASE%confcatalina.policy
goto execCmd
:doEmbedded
shift
set MAINCLASS=org.apache.catalina.startup.Embedded
goto execCmd
:doRun
shift
if not ""%1"" == ""-security"" goto execCmd
shift
echo Using Security Manager
set SECURITY_POLICY_FILE=%CATALINA_BASE%confcatalina.policy
goto execCmd
:doStart
shift
if not "%OS%" == "Windows_NT" goto noTitle
set _EXECJAVA=start "Tomcat" %_RUNJAVA%
echo Print _EXECJAVA %_EXECJAVA%
goto gotTitle
:noTitle
set _EXECJAVA=start %_RUNJAVA%
:gotTitle
if not ""%1"" == ""-security"" goto execCmd
shift
echo Using Security Manager
set SECURITY_POLICY_FILE=%CATALINA_BASE%confcatalina.policy
goto execCmd
:doStop
shift
set ACTION=stop
goto execCmd
:execCmd
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
rem Execute Java with the applicable properties
if not "%JPDA%" == "" goto doJpda
if not "%SECURITY_POLICY_FILE%" == "" goto doSecurity
%_EXECJAVA% %JAVA_OPTS% %CATALINA_OPTS% %DEBUG_OPTS% -Djava.endorsed.dirs="%JAVA_ENDORSED_DIRS%" -classpath "%CLASSPATH%" -Dcatalina.base="%CATALINA_BASE%" -Dcatalina.home="%CATALINA_HOME%" -Djava.io.tmpdir="%CATALINA_TMPDIR%" %MAINCLASS% %CMD_LINE_ARGS% %ACTION%
echo lastword %_EXECJAVA% %JAVA_OPTS% %CATALINA_OPTS% %DEBUG_OPTS% -Djava.endorsed.dirs="%JAVA_ENDORSED_DIRS%" -classpath "%CLASSPATH%" -Dcatalina.base="%CATALINA_BASE%" -Dcatalina.home="%CATALINA_HOME%" -Djava.io.tmpdir="%CATALINA_TMPDIR%" %MAINCLASS% %CMD_LINE_ARGS% %ACTION%
goto end
:doSecurity
%_EXECJAVA% %JAVA_OPTS% %CATALINA_OPTS% %DEBUG_OPTS% -Djava.endorsed.dirs="%JAVA_ENDORSED_DIRS%" -classpath "%CLASSPATH%" -Djava.security.manager -Djava.security.policy=="%SECURITY_POLICY_FILE%" -Dcatalina.base="%CATALINA_BASE%" -Dcatalina.home="%CATALINA_HOME%" -Djava.io.tmpdir="%CATALINA_TMPDIR%" %MAINCLASS% %CMD_LINE_ARGS% %ACTION%
goto end
:doJpda
if not "%SECURITY_POLICY_FILE%" == "" goto doSecurityJpda
%_EXECJAVA% %JAVA_OPTS% %CATALINA_OPTS% -Xdebug -Xrunjdwp:transport=%JPDA_TRANSPORT%,address=%JPDA_ADDRESS%,server=y,suspend=n %DEBUG_OPTS% -Djava.endorsed.dirs="%JAVA_ENDORSED_DIRS%" -classpath "%CLASSPATH%" -Dcatalina.base="%CATALINA_BASE%" -Dcatalina.home="%CATALINA_HOME%" -Djava.io.tmpdir="%CATALINA_TMPDIR%" %MAINCLASS% %CMD_LINE_ARGS% %ACTION%
goto end
:doSecurityJpda
%_EXECJAVA% %JAVA_OPTS% %CATALINA_OPTS% -Xrunjdwp:transport=%JPDA_TRANSPORT%,address=%JPDA_ADDRESS%,server=y,suspend=n %DEBUG_OPTS% -Djava.endorsed.dirs="%JAVA_ENDORSED_DIRS%" -classpath "%CLASSPATH%" -Djava.security.manager -Djava.security.policy=="%SECURITY_POLICY_FILE%" -Dcatalina.base="%CATALINA_BASE%" -Dcatalina.home="%CATALINA_HOME%" -Djava.io.tmpdir="%CATALINA_TMPDIR%" %MAINCLASS% %CMD_LINE_ARGS% %ACTION%
goto end
:end
最后打印的内容为
D:devapache-tomcat-4.1.40in>catalina.bat start
Using CATALINA_BASE: ..
Using CATALINA_HOME: ..
Using CATALINA_TMPDIR: .. emp
Using JAVA_HOME: D:devJDK8
Using _EXECJAVA "D:devJDK8injava"
print 鍙傛暟1 ""start""
Print _EXECJAVA start "Tomcat" "D:devJDK8injava"
最终指令::==> start "Tomcat" "D:devJDK8injava" -Dsun.io.useCanonCaches=false -Djava.endorsed.dirs="..commonendorsed" -classpath "D:devJDK8lib ools.jar;..inootstrap.jar" -Dcatalina.base=".." -Dcatalina.home=".." -Djava.io.tmpdir=".. emp" org.apache.catalina.startup.Bootstrap start
start "Tomcat" 是启动一个新cmd 窗口命名为"Tomcat",那么最后的只看指令就是java -classpath ..inootstrap.jar" org.apache.catalina.startup.Bootstrap start
那么类路径在bin下面有一个 bootstrap.jar文件,如果你打开看就是
org.apache.catalina.startup.Bootstrap类
public static void main(String args[]) { // Set the debug flag appropriately for (int i = 0; i < args.length; i++) { if ("-debug".equals(args[i])) debug = 1; } // Configure catalina.base from catalina.home if not yet set if (System.getProperty("catalina.base") == null) System.setProperty("catalina.base", getCatalinaHome()); // Construct the class loaders we will need ClassLoader commonLoader = null; ClassLoader catalinaLoader = null; ClassLoader sharedLoader = null; try { File unpacked[] = new File[1]; File packed[] = new File[1]; File packed2[] = new File[2]; ClassLoaderFactory.setDebug(debug); unpacked[0] = new File(getCatalinaHome(), "common" + File.separator + "classes"); packed2[0] = new File(getCatalinaHome(), "common" + File.separator + "endorsed"); packed2[1] = new File(getCatalinaHome(), "common" + File.separator + "lib"); commonLoader = ClassLoaderFactory.createClassLoader(unpacked, packed2, null); unpacked[0] = new File(getCatalinaHome(), "server" + File.separator + "classes"); packed[0] = new File(getCatalinaHome(), "server" + File.separator + "lib"); catalinaLoader = ClassLoaderFactory.createClassLoader(unpacked, packed, commonLoader); unpacked[0] = new File(getCatalinaBase(), "shared" + File.separator + "classes"); packed[0] = new File(getCatalinaBase(), "shared" + File.separator + "lib"); sharedLoader = ClassLoaderFactory.createClassLoader(unpacked, packed, commonLoader); } catch (Throwable t) { log("Class loader creation threw exception", t); System.exit(1); } Thread.currentThread().setContextClassLoader(catalinaLoader); // Load our startup class and call its process() method try { SecurityClassLoad.securityClassLoad(catalinaLoader); // Instantiate a startup class instance if (debug >= 1) log("Loading startup class"); Class startupClass = catalinaLoader.loadClass ("org.apache.catalina.startup.Catalina"); Object startupInstance = startupClass.newInstance(); // Set the shared extensions class loader if (debug >= 1) log("Setting startup class properties"); String methodName = "setParentClassLoader"; Class paramTypes[] = new Class[1]; paramTypes[0] = Class.forName("java.lang.ClassLoader"); Object paramValues[] = new Object[1]; paramValues[0] = sharedLoader; Method method = startupInstance.getClass().getMethod(methodName, paramTypes); method.invoke(startupInstance, paramValues); // Call the process() method if (debug >= 1) log("Calling startup class process() method"); methodName = "process"; paramTypes = new Class[1]; paramTypes[0] = args.getClass(); paramValues = new Object[1]; paramValues[0] = args; method = startupInstance.getClass().getMethod(methodName, paramTypes); method.invoke(startupInstance, paramValues); } catch (Exception e) { System.out.println("Exception during startup processing"); e.printStackTrace(System.out); System.exit(2); } }
那么执行这个mian 方法,那么tomcat 的源码在哪里呢?
具体为什么在这里,那么就要分析他的编译过程,下一篇就写下这个吧