string(14) "127.0.0.1:9200" URL: http://127.0.0.1:9200/likecs_art_db/_search
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RESPONSE:
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string(14) "127.0.0.1:9200" URL: http://127.0.0.1:9200/likecs_art_db/_search
REQUEST:
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RESPONSE:
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java-动态代理 - 爱码网

java-动态代理

zhh19981104

一、Java自带的动态代理

1、概述： 

JDK动态代理主要涉及java.lang.reflect包下的Proxy类和InvocationHandler接口。 JDK代理实现的三个要点：

　　通过java.lang.reflect.Proxy类来动态生成代理类
　　代理类要实现InvocationHandler接口
　　JDK代理只能基于接口进行动态代理

2、代码结构

　　　　　　　　　　　　　　　　　　　　　　　　　　　　

 

 

3、Jdk_ProxyService

package com.turtle.jdk;

public interface Jdk_ProxyService {

    public void doUpdate();

    public void doSave(String name);

    public String doFind();

}

 

 

4、Jdk_ProxyServiceImpl

package com.turtle.jdk;

/**
 * JDk的动态代理一定要满足实现接口的步骤
 */
public class Jdk_ProxyServiceImpl implements Jdk_ProxyService {

    @Override
    public void doUpdate() {
        System.out.println("进行更新操作");
    }

    @Override
    public void doSave(String name) {
        System.out.println("进行保存操作==="+name);
    }

    @Override
    public String doFind() {
        System.out.println("进行查询操作");
        return "SUCCESS";
    }
}

 

 

5、Jdk_MyInvocationHandler

package com.turtle.jdk;

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

// 代理类
public class Jdk_MyInvocationHandler implements InvocationHandler {

    // 这个就是我们要代理的真实对象
    private Object target;
    // 构造方法，给我们要代理的真实对象赋初值
    public Jdk_MyInvocationHandler(Object target) {
        this.target = target;
    }

    /*
     *invoke方法方法参数解析
     *Object proxy：指被代理的对象。
     *Method method：要调用的方法
     *Object[] args：方法调用时所需要的参数
     *InvocationHandler接口的子类可以看成代理的最终操作类。
     */
    @Override
    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {

        System.out.println("开始进行代理的增强");
        Object result= null;
        try{
            // 利用反射动态的来反射方法，这就是动态代理和静态代理的区别
            result = method.invoke(target,args);
        }catch (Exception e){
            e.printStackTrace();
        }finally {
            System.out.println("代理的增强完毕了");
        }
        return result;
    }
}

 

 

6、TestJdk

package com.turtle.jdk;

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

public class TestJdk {
    public static void main(String[] args) {

        // 我们要代理的真实对象
        Jdk_ProxyService jdkProxyService = new Jdk_ProxyServiceImpl();
        // 我们要代理哪个真实对象，就将该对象传进去
        InvocationHandler invocationHandler = new Jdk_MyInvocationHandler(jdkProxyService);

        /*
         *newProxyInstance方法参数解析
         *ClassLoader loader：类加载器
         *Class<?>[] interfaces：得到全部的接口
         *InvocationHandler h：得到InvocationHandler接口的子类实例
         */
        Jdk_ProxyService jdkProxyServiceProxy = (Jdk_ProxyService)Proxy.newProxyInstance(jdkProxyService.getClass().getClassLoader(),jdkProxyService.getClass().getInterfaces(),invocationHandler);

        //jdkProxyServiceProxy.doFind();
        // jdkProxyServiceProxy.doSave("测试");
        jdkProxyServiceProxy.doUpdate();

    }
}

 

二、使用CgliB来完成动态代理

1、概述：

        使用CGLib实现动态代理，完全不受代理类必须实现接口的限制，而且CGLib底层采用ASM字节码生成框架，使用字节码技术生成代理类，比使用Java反射效率要高。唯一需要注意的是，CGLib不能对声明为final的方法进行代理，因为CGLib原理是动态生成被代理类的子类。

2、代码结构、Jar包：

                                                                               

 

3、Cglib_ProxyService，被代理对象

package com.turtle.cglib;

public class Cglib_ProxyService {

    /**
     * 该方法不能被子类覆盖,Cglib是无法代理final修饰的方法的
     */
    public final void doDel(){
        System.out.println("正在进行删除操作");
    }

    /**
     * 有返回值、无参数
     * @return
     */
    public String doFind(){
        System.out.println("正在进行查询操作");
        return "SUCCESS";
    }

    /**
     * 有参数、有返回值
     * @param name
     * @return
     */
    public String doSave(String name){
        System.out.println("正在进行保存操作"+name);
        return "SUCCESS";
    }

    /**
     * 无参数、无返回值
     */
    public void doUpdate(){
        System.out.println("正在进行修改操作");
    }
}

 

4、Cglib_MyMethodInterceptor，我们自定义的代理，对对象做增强操作

package com.turtle.cglib;

import net.sf.cglib.proxy.MethodInterceptor;
import net.sf.cglib.proxy.MethodProxy;

import java.lang.reflect.Method;

/**
 * 自己建立的AOP注入
 */
public class Cglib_MyMethodInterceptor implements MethodInterceptor {

    /**
     * @param o cglib生成的代理对象
     * @param method 被代理对象方法
     * @param objects 方法入参
     * @param methodProxy 代理方法
     * @return
     * @throws Throwable
     */
    @Override
    public Object intercept(Object o, Method method, Object[] objects, MethodProxy methodProxy) throws Throwable {
        String result = null;
        // 通过方法签名来确定我们需要对哪些方法做增强操作
        if(methodProxy.getSignature().getName() == "doUpdate"){
            System.out.println("对doUpdate方法做前置增强");
            methodProxy.invokeSuper(o,objects);
            System.out.println("对doUpdate方法做后置增强");
        }
        if(methodProxy.getSignature().getName() == "doSave"){
            System.out.println("对doSave方法做前置增强");
            methodProxy.invokeSuper(o,objects);
            System.out.println("对doSave方法做后置增强");
        }
        if(methodProxy.getSignature().getName() == "doDel"){
            System.out.println("对doDel方法做前置增强");
            methodProxy.invokeSuper(o,objects);
            System.out.println("对doDel方法做后置增强");
        }
        if(methodProxy.getSignature().getName() == "doFind"){
            System.out.println("对doFind方法做前置增强");
            result = methodProxy.invokeSuper(o,objects).toString();
            System.out.println("对doFind方法做后置增强");
        }
        return result;
    }
}

 

5、Cglib_ProxyFactory，创建一个工厂来实例化我们的代理。

package com.turtle.cglib;

import net.sf.cglib.proxy.Enhancer;

/**
 * 将用来创建代理对象的操作放到简单工厂里面来实现
 */
public class Cglib_ProxyFactory<T> {

    public T createProxyObj(T obj){
        // 通过CGLIB动态代理获取代理对象的过程
        Enhancer enhancer = new Enhancer();
        // 设置enhancer对象的父类
        enhancer.setSuperclass(obj.getClass());
        // 设置enhancer的回调对象
        enhancer.setCallback(new Cglib_MyMethodInterceptor());
        // 创建代理对象
        return (T)enhancer.create();
    }
}

 

6、TestCglib，测试结果。

package com.turtle.cglib;

public class TestCglib {
    public static void main(String[] args) {
        // 取得工厂对象
        Cglib_ProxyFactory<Cglib_ProxyService> cglibProxyFactory = new Cglib_ProxyFactory<>();
        // 利用工厂来创建代理对象
        Cglib_ProxyService cglibProxyService = cglibProxyFactory.createProxyObj(new Cglib_ProxyService());

        // 通过代理对象调用目标方法

        // 无参数、无返回值的方法
        // cglibProxyService.doUpdate();

        // 有参数的方法
        // cglibProxyService.doSave("保存");

        // 有返回值的方法
        // String result = cglibProxyService.doFind();
        // System.out.println(result);

        // 被final修饰的方法
        cglibProxyService.doDel();
    }
}

 

三、总结

 

分类：

技术点：

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