Java代理运用-根据方法名输出结果

运行结果：

参考代码：

package com.cus;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;


interface IA {
    String getHelloname();
}

public class ShowMeBug {

    public static void main(String[] args) throws Exception{
        String first = IA.class.getName()+"$getHelloname=Abc";
        IA ia = (IA) createObject(first);
        System.out.println(first);
        System.out.println(ia.getHelloname()); //方法名匹配的时候，输出“Abc”
        first = IA.class.getName()+"$getTest=Bcd";
        ia = (IA) createObject(first);
        System.out.println(first);
        System.out.println(ia.getHelloname()); //方法名不匹配的时候，输出null
    }

    public static Object createObject(String str) throws Exception {
        String[] classMethodNameAndParaArray = str.split("\$");
        String className = classMethodNameAndParaArray[0];
        String methodNameAndPara = classMethodNameAndParaArray[1];
        String[] splitArray = methodNameAndPara.split("=");
        String name = splitArray[0];
        String value = splitArray[1];
        Class classObj = Class.forName(className);
        //自定义的方法调用事件处理器
        InvocationHandler invocationHandler = new InvocationHandler() {
            @Override
            public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
                if(name.equals(method.getName())){
                    return value;
                }
                return null;
            }
        };
        Class [] interfaceArray = new Class[1];
        interfaceArray[0] = classObj;
        Object object = Proxy.newProxyInstance(ClassLoader.getSystemClassLoader(),
                interfaceArray, invocationHandler);
        return object;
    }

}