Tomcat源码魔改maven项目进行debug

1、下载源码(Tomcat-9.0.46)

源码地址如下

https://mirrors.tuna.tsinghua.edu.cn/apache/tomcat/tomcat-9/v9.0.46/src/apache-tomcat-9.0.46-src.zip

2、改造为maven工程

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<!-- pom.xml -->
<?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>tomcat9</artifactId>
    <name>tomcat-9.0.46</name>
    <version>9.0.46</version>
    <build>
        <finalName>tomcat-9.0.46</finalName>
        <sourceDirectory>java</sourceDirectory>
        <!--<testSourceDirectory>test</testSourceDirectory>  test 下的有些文件报错，因此将test文件夹去掉了-->
        <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>3.6.0</version>
                <configuration>
                    <encoding>UTF-8</encoding>
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-jar-plugin</artifactId>
                <version>3.0.2</version>
            </plugin>
        </plugins>
    </build>
     <dependencies>
        <dependency>
            <groupId>org.apache.ant</groupId>
            <artifactId>ant</artifactId>
            <version>1.9.5</version>
        </dependency>
         <!-- https://mvnrepository.com/artifact/biz.aQute.bnd/annotation -->
         <!-- https://mvnrepository.com/artifact/biz.aQute.bnd/biz.aQute.bndlib -->
         <dependency>
             <groupId>biz.aQute.bnd</groupId>
             <artifactId>biz.aQute.bndlib</artifactId>
             <version>5.2.0</version>
             <scope>provided</scope>
         </dependency>

         <!-- https://mvnrepository.com/artifact/org.apache.jasper/org.apache.jasper -->
         <!-- https://mvnrepository.com/artifact/org.apache.tomcat/tomcat-jasper -->
         <dependency>
             <groupId>org.apache.tomcat</groupId>
             <artifactId>tomcat-jasper</artifactId>
             <version>9.0.44</version>
         </dependency>
         <dependency>
            <groupId>org.apache.ant</groupId>
            <artifactId>ant-apache-log4j</artifactId>
            <version>1.9.5</version>
        </dependency>
        <dependency>
            <groupId>org.apache.ant</groupId>
            <artifactId>ant-commons-logging</artifactId>
            <version>1.9.5</version>
        </dependency>
        <dependency>
            <groupId>javax.xml.rpc</groupId>
            <artifactId>javax.xml.rpc-api</artifactId>
            <version>1.1</version>
        </dependency>
        <dependency>
            <groupId>wsdl4j</groupId>
            <artifactId>wsdl4j</artifactId>
            <version>1.6.2</version>
        </dependency>
        <dependency>
            <groupId>org.eclipse.jdt.core.compiler</groupId>
            <artifactId>ecj</artifactId>
            <version>4.6.1</version>
        </dependency>
    </dependencies>
</project>

3、导入idea

将java/org/apache/jasper/compiler/JDTCompiler.java文件中的CompilerOptions.VERSION_15全部替换为CompilerOptions.VERSION_1_8，不然会报错，15版本的Tomcat代码貌似还没写，并将设置项目结构中的JDK版本设为1.8

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4、创建启动类

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5、添加vm-options避免乱码

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

5.启动项目

使用浏览器打开

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编译成功