Tomcat 7 - 在运行时获取应用程序名称，无需通过java-agent / aspectj登录 [英] Tomcat 7 - Get the application name during runtime without login via java-agent/aspectj

问题描述

我正在尝试获取所有已部署应用程序的列表，特别是映射到tomcat root 的应用程序的名称。
我希望能够在运行时使用收集tomcat服务器上的信息的java代理来完成它。
我尝试使用此代码示例：

I'm trying to get a list of all deployed applications, and specifically the name of the application mapped to tomcat root. I want to be able to do it during runtime, using a java agent that collects information on the tomcat server. I tried using this code sample:

private Iterable<String> collectAllDeployedApps() {
    try {
        final Set<String> result = new HashSet<>();
        final Set<ObjectName> instances = findServer()
                .queryNames(new ObjectName("Tomcat:j2eeType=WebModule,*"), null);
        for (ObjectName each : instances) {
            result.add(substringAfterLast(each.getKeyProperty("name"), "/")); //it will be in format like //localhost/appname 
        }
        return result;
    } catch (MalformedObjectNameException e) {
         //handle
    }
}

取自类似问题，但自我没有登录经理应用程序，我没有正确的权限，所以我得到一个空列表。

taken from a similar question but since I'm not logged into the manager app, I don't have the right permissions, so I get an empty list.

我真正想要的是什么 - 我有一个java代理（基于aspectJ），我希望在运行时/部署时间等能够获得所有已部署应用程序的列表，而无需自己实际登录管理器。
我该怎么办？我不介意检测tomcat的部署代码（由于我已经在使用代码，因此我不需要从我这边登录），但是我不确定要使用哪种功能。

What I actually want - I have a java agent (based on aspectJ), and I'd like during runtime/deployment time etc. to be able to get the list of all deployed apps without actually logging in to the manager myself. How can I do this? I don't mind instrumenting tomcat's deployment code (which doesn't require any login from my side as I'm already instrumenting the code), but I'm not sure which function to instrument.

谢谢，
林

推荐答案

问题包括两部分：

• 获取所有部署的应用程序的列表 - 在查看Tomcat的API之后，我发现了几个可以检测的相关部署代码部分：
  WarWatcher .java（允许检测更改），我们还可以看到以下应用程序 - UserConfig.java （可以在setDirectory名称上进行检测等），当然还有 HostConfig.java ：

• Get a list of all deployed applications - After reviewing Tomcat's API, I found several relevant deployment code parts which can be instrumented: WarWatcher.java (allows to detect changes), and we can also see the apps from - UserConfig.java which is called on startup (instrumentation can be done on setDirectory name etc.), and of course HostConfig.java that is called on stratup:

protected void org.apache.catalina.startup.HostConfig.deployWARs(java.io.File, java.lang.String[])

protected void org.apache.catalina.startup.HostConfig.deployApps()

protected void org.apache.catalina.startup.HostConfig.deployWAR(org.apache.catalina.util.ContextName, java.io.File)

此外 - 您可以检查参数：

In addition - you can check the argument for:

protected boolean org.apache.catalina.startup.HostConfig.deploymentExists(java.lang.String)

它包含war /文件夹名称（通常表示应用程序名称+ - ）。

It includes the war/folder name (which usually means the application name+-).

获取根应用程序名称 - 这可以通过使用 ServletContext.getRealPath（） - 它返回文件夹名称，从中战争名称可以是extr行动（并且可以在我的情况下至少作为应用名称使用）。

Get the root application name - This can be done by using ServletContext.getRealPath() - It returns the folder name, from which the war name can be extracted (and can be used, in my case at least as the app name).

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