目录
前言
一、准备工作
二、缺失文件引入
1.pom.xml
2.指定catalina-home
3.新建CookieFilter.java文件
三、构建项目
四、启动项目
前言
作为Java后端程序员，相信有很多人很想了解Tomcat的运行原理。Tomcat的构建是基于Ant和Eclipse的，然而现在很多人都喜欢IDEA+Maven的项目构建方式，本文描述了在Mac的环境下，使用IDEA导入Tomcat 8.5.66源码，并运行tomcat源码。
一、准备工作
- 下载tomcat源码：https://tomcat.apache.org/download-80.cgi#8.5.66
- 安装MAVEN：http://maven.apache.org/download.cgi
- 安装JDK1.8，较为简单，自行安装。
本地使用maven版本为3.8.1，JDK版本为1.8.0.181，IDE是2020.1（ulimate edition）
以上环境准备好之后，就可以将下载的tomcat源码解压并导入到ide中。
二、缺失文件引入
1.pom.xml
在根目录新建pom.xml文件，并将如下内容复制粘贴，并在pom.xml 文件上右键 Add as Maven Project
<?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>Tomcat8.5</artifactId>
<name>Tomcat8.5</name>
<version>8.5</version>
<build>
<finalName>Tomcat8.0</finalName>
<!-- 指定源文件为java 、test -->
<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>2.3</version>
<configuration>
<encoding>UTF-8</encoding>
<!-- 指定jdk 编译 版本 ，没装jdk 1.7的可以变更为1.6 -->
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
</plugins>
</build>
<!-- 添加tomcat8 所需jar包依赖 -->
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</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.easymock</groupId>
<artifactId>easymock</artifactId>
<version>4.0</version>
</dependency>
<dependency>
<groupId>org.eclipse.jdt.core.compiler</groupId>
<artifactId>ecj</artifactId>
<version>4.6.1</version>
</dependency>
<dependency>
<groupId>com.unboundid</groupId>
<artifactId>unboundid-ldapsdk</artifactId>
<version>3.2.0</version>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency>
</dependencies>
</project>2.指定catalina-home
新建catalina-home目录，并将conf和webapps目录拷贝到catalina-home目录中。并新建logs、work、temp、lib目录，初始都为空。
3.新建CookieFilter.java文件
因为具体编译阶段，会提示找不到此java文件，所以需要在test\util目录下新建CookieFilter.java文件，并将以下内容复制粘贴到文件中。
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package util;
import java.util.Locale;
import java.util.StringTokenizer;
/**
* Processes a cookie header and attempts to obfuscate any cookie values that
* represent session IDs from other web applications. Since session cookie names
* are configurable, as are session ID lengths, this filter is not expected to
* be 100% effective.
*
* It is required that the examples web application is removed in security
* conscious environments as documented in the Security How-To. This filter is
* intended to reduce the impact of failing to follow that advice. A failure by
* this filter to obfuscate a session ID or similar value is not a security
* vulnerability. In such instances the vulnerability is the failure to remove
* the examples web application.
*/
public class CookieFilter {
private static final String OBFUSCATED = "[obfuscated]";
private CookieFilter() {
// Hide default constructor
}
public static String filter(String cookieHeader, String sessionId) {
StringBuilder sb = new StringBuilder(cookieHeader.length());
// Cookie name value pairs are ';' separated.
// Session IDs don't use ; in the value so don't worry about quoted
// values that contain ;
StringTokenizer st = new StringTokenizer(cookieHeader, ";");
boolean first = true;
while (st.hasMoreTokens()) {
if (first) {
first = false;
} else {
sb.append(';');
}
sb.append(filterNameValuePair(st.nextToken(), sessionId));
}
return sb.toString();
}
private static String filterNameValuePair(String input, String sessionId) {
int i = input.indexOf('=');
if (i == -1) {
return input;
}
String name = input.substring(0, i);
String value = input.substring(i + 1, input.length());
return name + "=" + filter(name, value, sessionId);
}
public static String filter(String cookieName, String cookieValue, String sessionId) {
if (cookieName.toLowerCase(Locale.ENGLISH).contains("jsessionid") &&
(sessionId == null || !cookieValue.contains(sessionId))) {
cookieValue = OBFUSCATED;
}
return cookieValue;
}
}三、构建项目
Main class设置为org.apache.catalina.startup.Bootstrap
添加VM options （不要有回车换行，如直接拷贝，请仔细检查）
-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
// 控制台启动中文乱码，简单处理使用默认使用英文模式。
-Duser.language=
四、启动项目
上面工作完成后，点击run或debug进行启动。
项目启动完毕我们可以测试了，在浏览器访问http://localhost:8080/ 发现打不开我们看到的经典欢迎页面了，页面报了一个错。
原因是我们直接启动org.apache.catalina.startup.Bootstrap的时候没有加载org.apache.jasper.servlet.JasperInitializer，从而无法编译JSP。解决办法是在tomcat的源码org.apache.catalina.startup.ContextConfig中手动将JSP解析器初始化：
context.addServletContainerInitializer(new JasperInitializer(), null);
修改完后，项目再启动，我们再在浏览器访问http://localhost:8080/ ，就可以看到我们所熟悉的经典欢迎页面了
启动成功后，会出现访问具体app时出现中文乱码，可以参考如下文章解决：
