1.源码下载

下载链接：https://tomcat.apache.org/download-80.cgi#8.5.35

2.源码构建

2.1配置

解压缩：首先idea编译器创建空项目tomcat_original，然后将源代码压缩包解答到该项目当前目录中;

配置：

进入解压缩文件目录下即D:JetBrainsworksapcetomcat_original，创建文件夹home，并将conf,wappers目录移到该文件夹中；

在tomcat源码目录下即D:JetBrainsworksapcetomcat_originalapache-tomcat-8.5.55-src，创建 pom.xml文件，引入tomcat依赖；
pom文件中具体内容如下：注意改变artifactId标签的值

<?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>apache-tomcat-8.5.55-src</artifactId>
    <name>Tomcat8.5</name>
    <version>8.5</version>
 
    <build>
        <finalName>Tomcat8.5</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>2.3</version>
                <configuration>
                    <encoding>UTF-8</encoding>
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
            </plugin>
        </plugins>
    </build>
 
    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.easymock</groupId>
            <artifactId>easymock</artifactId>
            <version>3.4</version>
        </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>4.5.1</version>
        </dependency>
       
    </dependencies>
</project>

2.2源码导入

2.3启动源码

主启动类即main方法，路径：tomcat_originalapache-tomcat-8.5.55-srcjavaorgapachecatalinastartupBootstrap.java

配置启动类：

Vm options参数配置

-Dcatalina.home=D:/JetBrains/worksapce/tomcat_original/apache-tomcat-8.5.55-src/home
-Dcatalina.base=D:/JetBrains/worksapce/tomcat_original/apache-tomcat-8.5.55-src/home
-Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager
-Djava.util.logging.config.file=D:/JetBrains/worksapce/tomcat_original/apache-tomcat-8.5.55-src/home/conf/logging.properties

启动过程中如果控制台日志存在乱码现象，则VM options中加入以下配置：

-Duser.language=en -Duser.region=US -Dfile.encoding=UTF-8

配置org.apache.jasper.servlet.JasperInitializer：在tomcat的源码org.apache.catalina.startup.ContextConfig中的configureStart函数中手动将JSP解析器初始化： context.addServletContainerInitializer(new JasperInitializer(), null);

 protected synchronized void configureStart() {
        // Called from StandardContext.start()

        if (log.isDebugEnabled()) {
            log.debug(sm.getString("contextConfig.start"));
        }

        if (log.isDebugEnabled()) {
            log.debug(sm.getString("contextConfig.xmlSettings",
                    context.getName(),
                    Boolean.valueOf(context.getXmlValidation()),
                    Boolean.valueOf(context.getXmlNamespaceAware())));
        }

        webConfig();
        
        //初始化，引入下面一行代码
        context.addServletContainerInitializer(new JasperInitializer(), null);

        if (!context.getIgnoreAnnotations()) {
            applicationAnnotationsConfig();
        }
        if (ok) {
            validateSecurityRoles();
        }
        。。。。
        }

运行

将源码构建运行后，在浏览器输入http://localhost:8080，则成功进入tomcat的欢迎页面。

轻松构建Tomcat源码

1.源码下载

2.源码构建

2.1配置

2.2源码导入

2.3启动源码

运行