java 如何在java中创建代理
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How to create proxy in java
提问by javaguy
How do they create proxy of a classin java. Do they create the proxy on as needed basis or they create it and have it around forever.
他们如何class在java中创建a的代理。他们是根据需要创建代理，还是创建并永久使用它。
回答by Bozho
You can create proxies in two basic ways:
您可以通过两种基本方式创建代理：
- using the JDK mechanism, by interface. Take a look at
java.lang.reflect.Proxy. - using some byte-code generation/manipulation library, on a concrete class. Take a look at cgliband javassist
- 使用JDK机制，通过接口。看看
java.lang.reflect.Proxy。 - 在具体类上使用一些字节码生成/操作库。看看cglib和javassist
Apache has a nice utility: commons-proxy. It wraps many mechanisms and frameworks for creating proxies.
Apache 有一个很好的实用程序：commons-proxy。它包装了许多用于创建代理的机制和框架。
This is all about dynamic proxies - i.e. those created at runtime. For static proxies - see wikipedia about the proxy pattern
这都是关于动态代理——即那些在运行时创建的。对于静态代理 - 请参阅有关代理模式的维基百科
Note that you are not making a proxy of a class - you are making a proxy of an object.
请注意，您不是在制作类的代理 - 您正在制作对象的代理。
回答by drekka
I agree with the comments that the question is a little vague. However, I'd suggest you look at some of the mocking frameworks such as easymock and mockito. Their source code is available and their core functionality is creating proxies of class and interfaces. So they are good concrete examples of how to go about creating proxies.
我同意这个问题有点含糊的评论。但是，我建议您查看一些模拟框架，例如 easymock 和 mockito。他们的源代码是可用的，他们的核心功能是创建类和接口的代理。所以它们是如何创建代理的很好的具体例子。
