标签:DynamicProxy throw java var3 Object 代理 生成 catch public
资料
JDK动态代理生成的class文件保存到本地失败问题(sun.misc.ProxyGenerator.saveGeneratedFiles)
将JDK动态代理生成的类保存为 .class文件System.setProperty(“sun.misc.ProxyGenerator.saveGeneratedFiles“, “true“)无效
https://www.cnblogs.com/qinggege/p/5288182.html
从代理模式再出发!Proxy.newProxyInstance的秘密
JDK动态代理之 字节码生成流程
JAVA动态代理
Java 动态代理作用是什么?
代码
package com.proxy;
import java.lang.reflect.*;
public class ProxyTest {
public interface HelloInterface {
void sayHello();
}
public static void main(String[] args)
throws NoSuchMethodException, IllegalAccessException, InvocationTargetException, InstantiationException {
System.out.println("Hello World!");
System.setProperty("sun.misc.ProxyGenerator.saveGeneratedFiles", "true");
//System.getProperties().put("sun.misc.ProxyGenerator.saveGeneratedFiles", "true");
System.getProperties().put("jdk.proxy.ProxyGenerator.saveGeneratedFiles", "true");
System.setProperty("jdk.proxy.ProxyGenerator.saveGeneratedFiles", "true");
//jdk.proxy.ProxyGenerator.saveGeneratedFiles
// 得到代理
Class<?> hi = Proxy.getProxyClass(HelloInterface.class.getClassLoader(), HelloInterface.class);
// 得到Proxy0
Constructor constructor = hi.getConstructor(InvocationHandler.class);
// 反射创建代理实例
HelloInterface hiImpl = (HelloInterface) constructor.newInstance(new InvocationHandler() {
@Override
public Object invoke(Object o, Method method, Object[] objects) throws Throwable {
return null;
}
});
hiImpl.sayHello();
}
}
自动生成的代码
//
// Source code recreated from a .class file by IntelliJ IDEA
// (powered by FernFlower decompiler)
//
package com.sun.proxy;
import com.proxy.ProxyTest.HelloInterface;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.lang.reflect.UndeclaredThrowableException;
public final class $Proxy0 extends Proxy implements HelloInterface {
private static Method m1;
private static Method m3;
private static Method m2;
private static Method m0;
public $Proxy0(InvocationHandler var1) throws {
super(var1);
}
public final boolean equals(Object var1) throws {
try {
return (Boolean)super.h.invoke(this, m1, new Object[]{var1});
} catch (RuntimeException | Error var3) {
throw var3;
} catch (Throwable var4) {
throw new UndeclaredThrowableException(var4);
}
}
public final void sayHello() throws {
try {
super.h.invoke(this, m3, (Object[])null);
} catch (RuntimeException | Error var2) {
throw var2;
} catch (Throwable var3) {
throw new UndeclaredThrowableException(var3);
}
}
public final String toString() throws {
try {
return (String)super.h.invoke(this, m2, (Object[])null);
} catch (RuntimeException | Error var2) {
throw var2;
} catch (Throwable var3) {
throw new UndeclaredThrowableException(var3);
}
}
public final int hashCode() throws {
try {
return (Integer)super.h.invoke(this, m0, (Object[])null);
} catch (RuntimeException | Error var2) {
throw var2;
} catch (Throwable var3) {
throw new UndeclaredThrowableException(var3);
}
}
static {
try {
m1 = Class.forName("java.lang.Object").getMethod("equals", Class.forName("java.lang.Object"));
m3 = Class.forName("com.proxy.ProxyTest$HelloInterface").getMethod("sayHello");
m2 = Class.forName("java.lang.Object").getMethod("toString");
m0 = Class.forName("java.lang.Object").getMethod("hashCode");
} catch (NoSuchMethodException var2) {
throw new NoSuchMethodError(var2.getMessage());
} catch (ClassNotFoundException var3) {
throw new NoClassDefFoundError(var3.getMessage());
}
}
}
标签:DynamicProxy,throw,java,var3,Object,代理,生成,catch,public 来源: https://blog.csdn.net/AdrianAndroid/article/details/121630373
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