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Java：如何在JVM加载类时拦截类

[英]Java: How to intercept classes as they are being loaded by the JVM

原文 2012-04-17 22:26:40 7 1 java/ class/ runtime/ classloader/ instrumentation

In my program I want to intercept classes as they are being loaded by their ClassLoader and do some stuff with them eg. 在我的程序中，我想拦截类，因为它们被ClassLoader加载并用它们做一些事情，例如。 check for certain annotations etc. How do I do this? 检查某些注释等。我该怎么做？

I have already done a lot of research online but have not gotten my answer. 我已经在网上做了很多研究，但没有得到我的答案。 Should I perhaps override ClassLoader? 我应该覆盖ClassLoader吗？ The problem with that is that the parent ClassLoader gets to load the class in most cases, so I won't be able to get ALL classes. 问题在于，在大多数情况下，父ClassLoader可以加载类，因此我将无法获得所有类。 On a couple questions on this site I've seen Instrumentation get mentioned, but I don't know if that is relevant to my problem. 关于这个网站上的一些问题我已经看到了Instrumentation被提及，但我不知道这是否与我的问题有关。

1 个解决方案

You can use java agents to monitor this: 您可以使用Java代理来监控：

API doc: http://docs.oracle.com/javase/6/docs/api/java/lang/instrument/ClassFileTransformer.html API doc： http ： //docs.oracle.com/javase/6/docs/api/java/lang/instrument/ClassFileTransformer.html

Example: 例：

http://www.informit.com/guides/content.aspx?g=java&seqNum=589 http://www.informit.com/guides/content.aspx?g=java&seqNum=589

Java - 获取 JVM 中加载的所有类的列表 - Java - Get a list of all Classes loaded in the JVM

由jvm加载的类 - classes loaded by jvm

我如何获取 Java JVM 中加载的所有类的名称和 package - how can i get the name and package of all the classes loaded in the Java JVM

JVM加载哪些类而不是类加载器？ - Which classes are loaded by JVM but not a classloader?

JVM如何在Java中加载父类 - How JVM loads parent classes in Java

如何从JVM获取有关加载哪些类以及所有已加载类的规范的信息？ - How can I get information from JVM about what classes are loaded along with the specs of all the loaded class?

我的程序在运行时加载了哪些Java类？ - which java classes are being loaded by my program at run-time?

在ANOTHER JVM中获取已加载的类 - Get loaded classes within ANOTHER JVM

Groovy GroovyClassLoader JVM缓存和更新加载的类 - Groovy GroovyClassLoader JVM Caching and Updating Loaded Classes

从JVM清除所有已加载的类 - Clearing all loaded classes from the JVM

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