本文是Tomcat源码阅读系列的第一篇文章，该系列文章更多的是参考了网络上其他博主的博客和《How tomcat works》这本书。本文作为开篇，将描述一下，如何将Tomcat源码在Idea环境中运行起来。
1. 下载Tomcat6源码
到http://tomcat.apache.org/download-60.cgi处下载源码，如下图。
2. 创建聚合模块pom.xml
需要通过Maven组织文件，因此需要在apache-tomcat-6.0.44-src根目录下创建pom.xml文件，如下，
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>org.apache.tomcat</groupId>
<artifactId>Tomcat6.0</artifactId>
<name>Tomcat6.0</name>
<version>6.0</version>
<build>
<finalName>Tomcat6.0</finalName>
<sourceDirectory>java</sourceDirectory>
<testSourceDirectory>test</testSourceDirectory>
<resources>
<resource>
<directory>java</directory>
</resource>
</resources>
<testResources>
<testResource>
<directory>test</directory>
</testResource>
</testResources>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.0.2</version>
<configuration>
<encoding>UTF-8</encoding>
<source>1.6</source>
<target>1.6</target>
</configuration>
</plugin>
</plugins>
</build>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.5</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>ant</groupId>
<artifactId>ant</artifactId>
<version>1.7.0</version>
</dependency>
<dependency>
<groupId>wsdl4j</groupId>
<artifactId>wsdl4j</artifactId>
<version>1.6.2</version>
</dependency>
<dependency>
<groupId>javax.xml</groupId>
<artifactId>jaxrpc</artifactId>
<version>1.1</version>
</dependency>
<dependency>
<groupId>org.eclipse.jdt.core.compiler</groupId>
<artifactId>ecj</artifactId>
<version>4.2.2</version>
</dependency>
</dependencies>
</project>
如下：
3. 创建项目根目录的pom.xml
- 创建apache-tomcat-6.0.44-study文件夹
- 将包含pom.xml文件的apache-tomcat-6.0.44-src文件夹复制到apache-tomcat-6.0.44-study文件夹下
- apache-tomcat-6.0.44-study文件夹下创建catalina-home文件家
- 将D:\javaee_workspace\apache-tomcat-6.0.44-study\apache-tomcat-6.0.44-src\conf复制到D:\javaee_workspace\apache-tomcat-6.0.44-study\catalina-home\conf文件夹下
- 在apache-tomcat-6.0.44-study文件夹下创建pom.xml文件，内容如下：
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.yang</groupId>
<artifactId>apache-tomcat-study</artifactId>
<name>Tomcat 6.0 Study</name>
<version>1.0</version>
<packaging>pom</packaging>
<modules>
<module>apache-tomcat-6.0.44-src</module>
</modules>
</project>整体架构如下：
4. 使用Idea打开apache-tomcat-6.0.44-study项目
- 标记java文件夹为source root
- 设置Main class为：org.apache.catalina.startup.Bootstrap
- 设置VM options为：
-Dcatalina.home=catalina-home -Dcatalina.base=catalina-home -Djava.endorsed.dirs=catalina-home/endorsed -Djava.io.tmpdir=catalina-home/temp -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -Djava.util.logging.config.file=catalina-home/conf/logging.properties如图：
在Bootstrap的main方法当中加入测试代码：
System.out.println("======================Tomcat Study======================");
启动项目打印
======================Tomcat Study====================== 2015-6-15 21:16:55 org.apache.catalina.startup.ClassLoaderFactory validateFile 警告: Problem with directory [D:\javaee_workspace\apache-tomcat-6.0.44-study\catalina-home\lib], exists: [false], isDirectory: [false], canRead: [false] 2015-6-15 21:16:55 org.apache.catalina.startup.ClassLoaderFactory validateFile 警告: Problem with directory [D:\javaee_workspace\apache-tomcat-6.0.44-study\catalina-home\lib], exists: [false], isDirectory: [false], canRead: [false] 2015-6-15 21:16:55 org.apache.catalina.startup.ClassLoaderFactory validateFile 警告: Problem with directory [D:\javaee_workspace\apache-tomcat-6.0.44-study\catalina-home\lib], exists: [false], isDirectory: [false], canRead: [false] 2015-6-15 21:16:55 org.apache.catalina.startup.ClassLoaderFactory validateFile 警告: Problem with directory [D:\javaee_workspace\apache-tomcat-6.0.44-study\catalina-home\lib], exists: [false], isDirectory: [false], canRead: [false] 2015-6-15 21:16:55 org.apache.catalina.startup.Embedded initDirs 严重: Cannot find specified temporary folder at catalina-home/temp 2015-6-15 21:16:55 org.apache.catalina.core.AprLifecycleListener init 信息: The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: C:\Program Files (x86)\Java\jdk1.6.0_37\bin;C:\windows\Sun\Java\bin;C:\windows\system32;C:\windows;C:\Program Files (x86)\Common Files\NetSarang;C:\windows\system32;C:\windows;C:\windows\System32\Wbem;C:\windows\System32\WindowsPowerShell\v1.0\;C:\Program Files\Java\jdk1.6.0_45\bin;C:\Program Files\Java\jdk1.6.0_45\jre\bin;C:\Program Files\TortoiseSVN\bin;C:\Program Files\TortoiseSVN\bin;C:\Program Files (x86)\Common Files\lenovo\easyplussdk\bin;. 2015-6-15 21:16:55 org.apache.coyote.http11.Http11Protocol init 信息: Initializing Coyote HTTP/1.1 on http-8080 2015-6-15 21:16:55 org.apache.catalina.startup.Catalina load 信息: Initialization processed in 195 ms 2015-6-15 21:16:55 org.apache.catalina.core.StandardService start 信息: Starting service Catalina 2015-6-15 21:16:55 org.apache.catalina.core.StandardEngine start 信息: Starting Servlet Engine: Apache Tomcat/@VERSION@ 2015-6-15 21:16:55 org.apache.coyote.http11.Http11Protocol start 信息: Starting Coyote HTTP/1.1 on http-8080 2015-6-15 21:16:55 org.apache.jk.common.ChannelSocket init 信息: JK: ajp13 listening on /0.0.0.0:8009 2015-6-15 21:16:55 org.apache.jk.server.JkMain start 信息: Jk running ID=0 time=0/8 config=null 2015-6-15 21:16:55 org.apache.catalina.startup.Catalina start 信息: Server startup in 47 ms
Tomcat源码成功运行。