在前两篇文章中
java 的三种代理模式
jdk动态代理与cglib优势劣势以及jdk动态代理为什么要interface
讨论了jdk的动态代理
本文从源码级别了解一下，在源代码的基础上，加上
System.setProperty("sun.misc.ProxyGenerator.saveGeneratedFiles", "true");
在注解的本质（yet）中，我们也曾经这么干，将代理类弄出来
Proxy0.class
public final class $Proxy0 extends Proxy implements IUserDao {
private static Method m1;
private static Method m3;
private static Method m2;
private static Method m0;
public $Proxy0(InvocationHandler var1) throws {
super(var1);
}
public final boolean equals(Object var1) throws {
try {
return ((Boolean)super.h.invoke(this, m1, new Object[]{var1})).booleanValue();
} catch (RuntimeException | Error var3) {
throw var3;
} catch (Throwable var4) {
throw new UndeclaredThrowableException(var4);
}
}
public final void save() throws {
try {
super.h.invoke(this, m3, (Object[])null);
} catch (RuntimeException | Error var2) {
throw var2;
} catch (Throwable var3) {
throw new UndeclaredThrowableException(var3);
}
}
h:
public class ProxyFactory implements InvocationHandler {
//维护一个目标对象
private Object target;
public ProxyFactory(Object target){
this.target = target;
}
@Override
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
Object returnValue = method.invoke(target, args);
return returnValue;
}
//给目标对象生成代理对象
public Object getProxyInstance(){
return Proxy.newProxyInstance(target.getClass().getClassLoader(), target.getClass().getInterfaces(), this);
}
}
