Tomcat 源码阅读（一）源码项目构建

作者: 会飞的花生米 | 来源:发表于2020-09-14 22:31 被阅读0次

Tomcat 源码阅读（一）源码项目构建
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源码下载：

git clone https://gitee.com/mirrors/tomcat.git
# 通过切换分支切换Tomcat版本
cd tomcat/
git checkout -b "tomcat8.5" origin/8.5.x

导入IDEA：

在根目录下新建pom.xml

1600136938938.png

<?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>
    <version>8.5</version>

    <build>
        <finalName>Tomcat8.5</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>
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
            </plugin>
        </plugins>
    </build>
    <!-- 添加tomcat8所需的依赖包 -->
    <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>3.3</version>
        </dependency>
        <dependency>
            <groupId>org.eclipse.jdt.core.compiler</groupId>
            <artifactId>ecj</artifactId>
            <version>4.6.1</version>
        </dependency>
    </dependencies>


</project>

File -> New ->Project From Existing Sources..

1600137003422.png

选中tomcat目录下的pom.xml

1600137057728.png

生成maven project

1600137103190.png

1600137111607.png

1600137120274.png

1600137128802.png

让Maven飞一会儿，拉取dependencies，导入成功

1600137186778.png

添加CookieFilter.java

在\tomcat\test\util目录下添加CookieFilter.java

/*
 * 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;
    }
}

修改MANIFEST.MF

找到 modules/jdbc-pool/resources/MANIFEST.MF

并修改文件中所有@VERSION@ 为1.1

启动项VM参数配置

配置路径为Tomcat绝对路径

-Dcatalina.home=D:/tomcat/tomcat
-Dcatalina.base=D:/tomcat/tomcat
-Djava.endorsed.dirs=D:/tomcat/tomcat
-Djava.io.tmpdir=D:/tomcat/tomcat/temp
-Djava.util.loging.manager=org.apache.juli.ClassLoaderLogManager
-Djava.util.loging.config.file=D:/tomcat/tomcat/conf/logging.properties

解决 JSP NullPointerException

浏览器访问http://localhost:8080/

返回500 并打印出以下错误信息


org.apache.jasper.JasperException: java.lang.NullPointerException
    org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:598)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:514)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:386)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:330)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:733)
java.lang.NullPointerException
    org.apache.jsp.index_jsp._jspService(index_jsp.java:424)
    org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:71)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:733)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:476)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:386)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:330)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:733)

解决：

找到 org.apache.catalina.startup.ContextConfig 中 init()方法

protected synchronized void init() {
        // Called from StandardContext.init()

        Digester contextDigester = createContextDigester();
        contextDigester.getParser();

        if (log.isDebugEnabled()) {
            log.debug(sm.getString("contextConfig.init"));
        }
        context.setConfigured(false);
        ok = true;

        contextConfig(contextDigester);
        //添加以下代码
        context.addServletContainerInitializer(new JasperInitializer(),null);
    }

启动Bootstrap

启动 org.apache.catalina.startup.Bootstrap.main(String args[])

打开浏览器输入

http://localhost:8080/

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