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了解Eclipse的Plugin Framework需要对ClassLoader(类装载器)有比较深入的了解,建议读读JDK的源代码,会很有帮助。


ClassLoader Buy Cipro Without Prescription, - 顾名思义,就是Java中用来装载类的部分,要将一个类的名字装载为JVM中实际的二进制类数据。在JVM中,任何一个类被加载,都是通过ClassLoader来实现的,同时,每个Class对象也都有一个引用指向装载他的ClassLoader,你可以通过getClassLoader()方法得到它。


ClassLoader只是一个抽象类,你可以定义自己的ClassLoader来实现特定的Load的功能。Eclipse Plugin Framework就实现了自己的ClassLoader。


ClassLoader使用所谓的"Delegation Model"(“双亲委托模型”)来查找、定位类资源,每一个ClassLoader都有自己一个父ClassLoader实例,当这个ClassLoader被要求加载一个类时,它首先会询问自己的父ClassLoader,看看他是否能加载,如果不能的话,才自己加载。


Java ClassLoader的体系结构是


Bootstrap ClassLoader <- Standard Extensions ClassLoader <- Class Path Class Loader


最后来看一下代码:


[code lang="java"]
protected synchronized Class loadClass(String name, boolean resolve)
throws ClassNotFoundException
{
// First, check if the class has already been loaded
Class c = findLoadedClass(name);
if (c == null) {
try {
if (parent != null) {
c = parent.loadClass(name, false);
} else {
c = findBootstrapClass0(name);
}
} catch (ClassNotFoundException e) {
// If still not found, then invoke findClass in order
// to find the class.
c = findClass(name);
}
}
if (resolve) {
resolveClass(c);
}
return c;
}
[/code]

可见,ClassLoader首先会查找该类是否已经被装载,如果没有,就询问自己的父ClassLoader,如果还不能装载,就调用findClass()方法来装载类。所以,一般简单的自定义ClassLoader只需要重写findClass方法就可以了。


如果你的类不是文件,比如说是序列化在数据库中的二进制流或者网络上的Bit流,就需要重写defineClass()方法,来将二进制数据映射到运行时的数据结构。另外一种需求也可能是你需要对类文件进行某种操作(比如按位取反?),也需要定义自己的defineClass()方法。


还需要注意的是资源的加载和系统Native库的加载,这个可以留在以后再作讨论。

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