源码调试tomcat

1.直接通过github搜索tomcat，正好找到一位有部分翻译内容的版本，直接fork并下载

git clone https://github.com/codefollower/Tomcat-Research.git

2.转换成eclipse项目工程，如果没有安装maven，可以先配置maven环境变量

sudo  mvn eclipse:eclipse 

3.在eclipse中导入
File->Import->General->Existing Projects into Workspace

4.导入后的效果如图所示

5.Eclipse中右击start-tomcat.launch这个文件，点Run As启动Tomcat，点Debug As可以调试Tomcat

6.效果如图所示

7.启动后通过地址http://127.0.0.1:8080/访问

8.这时候通过上文的类似Manager App打开无法访问(http://www.cnblogs.com/lixiaojiao-hit/p/5095180.html)

9.直接webapp目录下的manager host-manager docs目录放到launch/webapps目录下

10.并按照上文中的配置进行修改，在tomcat-users.xml中进行相关配置

　　 <role rolename="tomcat" />
    <role rolename="role1" />
    <user username="tomcat" password="tomcat"
        roles="tomcat,admin,manager,manager-gui,manager-script,manager-jax,manager-status,admin-gui" />
    <user username="both" password="tomcat" roles="tomcat,role1" />
    <user username="role1" password="tomcat" roles="role1" />

11.这时候访问查看manager app页面就可以访问了

12.随便点击按钮，调试一下源码，比如stop应用，审查一下源代码

13.发现访问路径为/manager/html/stop?path=/docs&org.apache.catalina.filters.CSRF_NONCE=95AC2B2A81FB328CA52AF996C7F02EB4

14.查看下后台日志，切换到apache-tomcat-8.0.30/logs目录下看下日志，tail -f 10000 localhost_access_log.2016-01-03.txt

15.那么找到web.xml中找到相关配置文件

<servlet>
    <servlet-name>Manager</servlet-name>
    <servlet-class>org.apache.catalina.manager.ManagerServlet</servlet-class>
    <init-param>
      <param-name>debug</param-name>
      <param-value>2</param-value>
    </init-param>
 </servlet>

16.发现相关servlet为ManagerServlet，打开ManagerServlet.java文件后发现相关代码

17.找到stop代码，直接停止到相对应的context也就是web应用

 protected void stop(PrintWriter writer, ContextName cn,
            StringManager smClient) {

        if (debug >= 1)
            log("stop: Stopping web application '" + cn + "'");

        if (!validateContextName(cn, writer, smClient)) {
            return;
        }

        String displayPath = cn.getDisplayName();

        try {
            Context context = (Context) host.findChild(cn.getName());
            if (context == null) {
                writer.println(smClient.getString("managerServlet.noContext",
                        RequestUtil.filter(displayPath)));
                return;
            }
            // It isn't possible for the manager to stop itself
            if (context.getName().equals(this.context.getName())) {
                writer.println(smClient.getString("managerServlet.noSelf"));
                return;
            }
            context.stop();
            writer.println(smClient.getString(
                    "managerServlet.stopped", displayPath));
        } catch (Throwable t) {
            ExceptionUtils.handleThrowable(t);
            log("ManagerServlet.stop[" + displayPath + "]", t);
            writer.println(smClient.getString("managerServlet.exception",
                    t.toString()));
        }

    }