是否可以将 Java Servlet 部署到 GAE? [英] Is it possible to deploy a Java Servlet to GAE?

问题描述

是否可以将 Java Servlet 部署到 GAE，或者服务器是否需要托管在其他地方?

Is it possible to deploy a Java Servlet to GAE, or does the server need to be hosted elsewhere?

推荐答案

简短回答:是

答案稍长:

App Engine 使用 Jetty servlet 容器来托管应用程序并支持 Java Servlet API 2.4 版.请记住，您必须遵守一些限制(source):

App Engine uses the Jetty servlet container to host applications and supports the Java Servlet API version 2.4. Keep in mind though that there are quite a few restrictions in place that you have to respect (source):

• App Engine 运行 Java 6 版本，但不提供所有 Java 类，例如 Swing 和大多数 AWT 类不受支持.
• 您不能使用线程或使用线程的框架.
• 您不能写入文件系统.
• 您只能读取属于您的应用程序的文件.
• 某些java.lang.System"操作，例如gc() 或 exit() 什么也不做.
• 您不能调用 JNI 代码.
• 反射可以用于您自己的类和标准 Java 类，但您不能使用反射来访问应用程序之外的其他类.
• servlet 必须在 30 秒内回复，否则会抛出 com.google.apphosting.api.DeadlineExceededException.
• 请参阅此处，了解列入白名单的 Java 类.

• App Engine runs a version of Java 6 but does not provide all Java classes, for example Swing and most AWT classes are not supported.
• You cannot use Threads or frameworks which use Threads.
• You may not write to the filesystem.
• You may only read files which are part of your application.
• Certain "java.lang.System" actions, e.g. gc() or exit() will do nothing.
• You can not call JNI code.
• Reflection is possible for your own classes and standard Java classes, but your cannot use reflection to access other classes outside your application.
• A servlet must reply within 30 seconds or a com.google.apphosting.api.DeadlineExceededException is thrown.
• See here for the Java classes that are white-listed.

请务必同时阅读沙盒查看什么可行和不可行的示例.

Be sure to also read up on The Sandbox to see examples of what will and will not work.

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