类路径问题，Head First servlet 书籍
我正在通过 Head First 的 Servlet 和 JSP 进行学习，并完成第三章的作业。
在第 81 页，有一个 javac 调用：
> %javac -classpath /Users/bert/Applications2/tomcat/common/lib/
servlet-api.jar:classes:. -d classes src/com/example/web/BeerSelect.java
我不明白它想要做什么。书上说，common 之前的路径上的所有内容都应该适合我的特定系统，但我没有 common/lib 路径（据我所知）。我正在 ubuntu 9 上工作，我创建了以下目录结构来部署和开发本章讨论的 Web 应用程序，它们都没有 common/lib/ 路径。我在我的机器上哪里可以找到这个？
I'm studying via Head First's Servlets and JSPs, and doing the assignment on the third chapter.
On page 81, there's this javac call:
> %javac -classpath /Users/bert/Applications2/tomcat/common/lib/
servlet-api.jar:classes:. -d classes src/com/example/web/BeerSelect.java
I don't get what it's trying to do. The book says that everything on the path before common should be suited for my specific system, but I don't have a common/lib path (not that I know of). I'm working on ubuntu 9 and I have created the following directory structures for deployment and developing of the web app that the chapter talks about, neither of them has a common/lib/ path on them. Where can I find this on my machine?
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您使用的是哪一版本的书？
/common/lib在 Tomcat 5.5 (Servlet 2.4) 中一直有效。从 Tomcat 6.x (Servlet 2.5) 开始，Servlet API 库就可以在/lib文件夹中找到。Which edition of the book are you using? The
/common/libis true for until with Tomcat 5.5 (Servlet 2.4). Since Tomcat 6.x (Servlet 2.5) and on the Servlet API libraries are available in/libfolder.如果跟踪路径的其余部分，您将看到 common/lib 属于 Tomcat，在编译和打包 servlet 时，您将在该引擎上部署和运行 servlet。
我假设您已经下载并安装了 Tomcat。
既然你说这本书调用了“common/lib”，那就告诉我这些例子是基于Tomcat 5.5的。 Tomcat 6.x（最新版本）使用“lib”而不是“common/lib”。
关键是您需要 servlet API JAR 才能成功编译。
If you trace the rest of the path, you'll see that common/lib belongs to Tomcat, the engine on which you'll deploy and run your servlet when it's compiled and packaged.
I'm assuming that you've downloaded and installed Tomcat.
Since you said the book called for "common/lib", that tells me that the examples are based on Tomcat 5.5. Tomcat 6.x, the latest version, uses "lib" instead of "common/lib".
The point is that you need the servlet API JAR in order to compile successfully.
如果您安装了 Tomcat 的打包版本，则应为：
/usr/share/tomcat5.5/common/lib/servlet-api.jar/usr/share/tomcat6 Tomcat 6 的 /lib/servlet-api.jar但我的建议是从 官网（如果你想坚持看书，就获取这本书的版本）并将其解压到你的主文件夹中（我把这种东西放在
~/opt）If you installed a packaged version of tomcat, it should be:
/usr/share/tomcat5.5/common/lib/servlet-api.jarfor Tomcat 5.5/usr/share/tomcat6/lib/servlet-api.jarfor Tomcat 6But my recommendation would be to get a binary distribution of Tomcat from the official website (get the version of the book if you want to stick to the book) and to uncompress it in your home folder (I put this kind of stuff in
~/opt)