转载：动态代理实现

最新推荐文章于 2025-07-06 17:11:54 发布

转载最新推荐文章于 2025-07-06 17:11:54 发布 · 213 阅读

java 专栏收录该内容

39 篇文章

订阅专栏

1，基于接口的动态代理必须首先要定义接口：

代码如下：

package com.tong.qiu.proxy;
 
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
 
/**
 * Created by ywb
 */
public interface Subject {
    void doSomething();
    void somethingElse(String arg);
}
 
class DynamicProxyHandler implements InvocationHandler {
    private Object proxied;
    public DynamicProxyHandler(Object proxied) {
        this.proxied = proxied;
    }
    public Object
    invoke(Object proxy, Method method, Object[] args)
            throws Throwable {
        System.out.println("**** proxy: " + proxy.getClass() +
                ", method: " + method + ", args: " + args);
        if(args != null)
            for(Object arg : args)
                System.out.println("  " + arg);
        return method.invoke(proxied, args);
    }
}
 
class RealObject implements Subject {
    public void doSomething() {
        System.out.println("doSomething");
    }
    public void somethingElse(String arg) {
        System.out.println("somethingElse " + arg);
    }
}
 
class SimpleDynamicProxy {
    public static void consumer(Subject iface) {
        iface.doSomething();
        iface.somethingElse("bonobo");
    }
    public static void main(String[] args) {
        RealObject real = new RealObject();
        consumer(real);
 
        Subject proxy = (Subject) Proxy.newProxyInstance(//此处生成代理对象
                Subject.class.getClassLoader(),
                new Class[]{ Subject.class },
                new DynamicProxyHandler(real));
        consumer(proxy);
    }
}

1，基于接口的动态代理必须首先要定义接口：

代码如下：

package com.tong.qiu.proxy;
 
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
 
/**
 * Created by ywb
 */
public interface Subject {
    void doSomething();
    void somethingElse(String arg);
}
 
class DynamicProxyHandler implements InvocationHandler {
    private Object proxied;
    public DynamicProxyHandler(Object proxied) {
        this.proxied = proxied;
    }
    public Object
    invoke(Object proxy, Method method, Object[] args)
            throws Throwable {
        System.out.println("**** proxy: " + proxy.getClass() +
                ", method: " + method + ", args: " + args);
        if(args != null)
            for(Object arg : args)
                System.out.println("  " + arg);
        return method.invoke(proxied, args);
    }
}
 
class RealObject implements Subject {
    public void doSomething() {
        System.out.println("doSomething");
    }
    public void somethingElse(String arg) {
        System.out.println("somethingElse " + arg);
    }
}
 
class SimpleDynamicProxy {
    public static void consumer(Subject iface) {
        iface.doSomething();
        iface.somethingElse("bonobo");
    }
    public static void main(String[] args) {
        RealObject real = new RealObject();
        consumer(real);
 
        Subject proxy = (Subject) Proxy.newProxyInstance(//此处生成代理对象
                Subject.class.getClassLoader(),
                new Class[]{ Subject.class },
                new DynamicProxyHandler(real));
        consumer(proxy);
    }
}