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如何在tomcat或jetty下更改Java webapp'WEB-INF路径'约定

[英]How to change the Java webapp 'WEB-INF path' convention under tomcat or jetty

原文 2013-08-26 04:17:46 1 2 java/ java-ee/ tomcat/ jetty

under a Java Webapp, 在Java Webapp下，

I want to set /WEB-INF/lib to D:/somepath/lib 我想将/ WEB-INF / lib设置为D：/ somepath / lib

and /WEB-INF/classes to E:/somepath/classes 和/ WEB-INF / classes到E：/ somepath / classes

and web.xml to F:/somepath/config.xml 和web.xml到F：/somepath/config.xml

how to config these under tomcat or jetty to change the convention? 如何在tomcat或jetty下配置这些来改变约定？

2 个解决方案

The specification (Java™ Servlet Specification Version 2.3) only mentions standard folders: 规范（Java™Servlet规范版本2.3）仅提到标准文件夹：

The web application classloader must load classes from the WEB-INF/classes directory first, and then from library JARs in the WEB-INF/lib directory. Web应用程序类加载器必须首先从WEB-INF / classes目录加载类，然后从WEB-INF / lib目录中的库JAR加载类。

With Tomcat or Jetty you cannot do it with "out-of-box" provided functionality: 使用Tomcat或Jetty，您无法使用“开箱即用”提供的功能：

Tomcat : Tomcat ：

WebappX — A class loader is created for each web application that is deployed in a single Tomcat instance. WebappX - 为部署在单个Tomcat实例中的每个Web应用程序创建一个类加载器。 All unpacked classes and resources in the /WEB-INF/classes directory of your web application, plus classes and resources in JAR files under the /WEB-INF/lib directory of your web application, are made visible to this web application, but not to other ones. Web应用程序的/ WEB-INF / classes目录中的所有解压缩的类和资源，以及Web应用程序的/ WEB-INF / lib目录下的JAR文件中的类和资源，都对此Web应用程序可见，但不是到其他人。

Jetty : 码头：

The normal configuration is for each web context (web application or war file) is given it's own classloader, which has the system classloader as it's parent. 正常配置是为每个Web上下文（Web应用程序或war文件）提供它自己的类加载器，它具有系统类加载器作为它的父级。 Such a classloader hierarchy is normal in Java, however the servlet specification complicates the hierarchy by requiring that: 这样的类加载器层次结构在Java中是正常的，但是servlet规范通过要求以下内容使层次结构复杂化：

Classes contained within WEB-INF/lib or WEB-INF/classes have priority over classes on the parent class loader. WEB-INF / lib或WEB-INF / classes中包含的类优先于父类加载器上的类。 This is the opposite of the normal behaviour of a java 2 class loader. 这与java 2类加载器的正常行为相反。

However, you can: 但是，您可以：

Cheers 干杯

On a Unix system you could do this manually by setting up soft links from the expected places to the locations on the other disks. 在Unix系统上，您可以通过设置从预期位置到其他磁盘上的位置的软链接来手动执行此操作。

Both application servers you mention are open source, so you could write your own version of them. 您提到的两个应用程序服务器都是开源的，因此您可以编写自己的版本。 I guess the part that implements the classloader for a web app is what you would have to change. 我想实现Web应用程序的类加载器的部分是您必须更改的部分。

But if you must engage in such shenanigans, you should suspect that you have made a wrong decision earlier. 但是，如果你必须参与这样的诡计，你应该怀疑你早些时候做出了错误的决定。 I can think of no good reason to do what you want to do. 我认为没有理由去做你想做的事。