(尚硅谷)21 反射的应用-动态代理-AOP代理的实现

<span style="font-size:18px;">复习//了解体会反射package com.atguigu.review;import java.lang.reflect.Constructor;import org.junit.Test;/* *java.lang.Class反射的源头  * 1)人和一个java源文件经过编译后(java.exe) * 声明为一个活多个字节码文件(.class) * .class文件经过java.exe解释运行,需要使用JVM的类的加载器加载到缓存(运行时类) * 那么加载到缓存中的.class文件就对应这一个Class实例 * 2)任何一个运行时类之加载一次，生成唯一的Class对象 * 3)如何获取运行时类对应的大的Class 实例*(三种方法) */public class REFLECT {@Testpublic void Test1(){//第一种方法,直接调用运行时类的.class属性Class clazz1 = person.class;System.out.println(clazz1);clazz1 = com.atguigu.review.person.class;System.out.println(clazz1);}@Testpublic void Test2(){//第二种方法,通过运行时类的getClass()person p = new person();Class clazz2 = p.getClass();System.out.println(clazz2);}@Testpublic void Test3() throws Exception{//第三种,调用class的静态方法forName(String className)报异常String className  = "com.atguigu.review.person";Class clazz3 = Class.forName(className);System.out.println(clazz3);}@Testpublic void Test4() throws Exception{//第四种,通过类的加载器调用String className  = "com.atguigu.review.person";ClassLoader loader = this.getClass().getClassLoader();Class clazz = loader.loadClass(className);System.out.println(clazz);}public Object getObject(String str)throws Exception{return Class.forName(str).newInstance();}@Testpublic void Test5()throws Exception{String className  = "com.atguigu.review.person"; Object obj = getObject(className);}/* * 有了Class类后 * 1)用来调用运行时类的对象①调用Class的newInstance()②调用制定的构造器 * 2)可以获取运行时类的完整的结构 * 3)可以调用云翔时类的属性方法构造器.. */@Testpublic void Test()throws Exception {String className  = "com.atguigu.review.person"; Class clazz = Class.forName(className);//newInstance()调用的是空参的构造器//大家创建一个类时，通常提供方一个空参的构造器Object obj = clazz.newInstance();person p = (person)obj;System.out.println(p);}@Testpublic void Test12()throws Exception {String className  = "com.atguigu.review.person"; Class clazz = Class.forName(className);Constructor con = clazz.getDeclaredConstructor(String.class , int.class);con.setAccessible(true);Object obj = con.newInstance("王琪",90);person p = (person)obj;System.out.println(p);}/* * 可以获取对应运行时类的运行中声明的所有类的结构：属性，方法，构造器，内部类 * 父类，接口，包，异常，注解.. * File[] getFields():可以获取运行时类中及其父类中所有的public属性 * File[] getDeclaredFields():可以获取运行时类本身定义的声明为任何权限的属性 */}复习实例反射调用---package com.atguigu.review;public class Animal {public String name ;private int id ;  private static String desc ;public String getName(){return name;}public void setName(String name){this.name = name ;}public int getId(){return id;}public static String getDesc() {return desc;}public static void setDesc(String desc) {Animal.desc = desc;}public void setId(int id) {this.id = id;}public Animal() {super();}public Animal(String name, int id) {super();this.name = name;this.id = id;}public void show(){System.out.println("我是一个动物");}public static String display(){return desc;}public String info(String style){return "我是动物:"+style;}public String toString (){return "Animal"+name+"id "+id;}}package com.atguigu.review;import java.lang.reflect.Constructor;import java.lang.reflect.Field;import java.lang.reflect.Method;import org.junit.Test;public class TestCLazz {@Testpublic void Test1() throws Exception{//1.获取Class实例Class clazz = Animal.class;//2.创建对应的运行时类//方法一:newInstance();Object obj = clazz.newInstance();Animal a = (Animal)obj ;System.out.println(a);//3.调用制定的运行时类的属性Field name = clazz.getDeclaredField("name");name.setAccessible(true);name.set(a, "Tom猫");Field id = clazz.getDeclaredField("id");id.setAccessible(true);id.set(a, 10);System.out.println(a);Field desc = clazz.getDeclaredField("desc");desc.setAccessible(true);desc.set(a, "可爱");System.out.println(desc.get(a));System.out.println(desc.get(Animal.class));}@Testpublic void Test2() throws Exception{Class clazz = Animal.class;//方法二：获取对应的运行时的类对象Object returnVal = null;Constructor cons = null;Animal a =null;try {cons = clazz.getDeclaredConstructor(String.class , int.class);cons.setAccessible(true);a= (Animal)cons.newInstance("jerry老鼠",12);//获取运行时类中制定的方法Method method1 = clazz.getDeclaredMethod("show");returnVal = method1.invoke(a);} catch (Exception e) {e.printStackTrace();}System.out.println(returnVal);Method method2 = clazz.getDeclaredMethod("info", String.class);method2.setAccessible(true);Object obj1 = method2.invoke(a, "老鼠");System.out.println(obj1);Method method3 = clazz.getDeclaredMethod("display");method3 .setAccessible(true);Object return2 = method3 .invoke(Animal.class);System.out.println(return2);}}package com.atguigu.review;import java.lang.reflect.Field;import java.lang.reflect.Method;import org.junit.Test;public class REFLECT2 {@Testpublic void Test1()throws Exception{//获取Class实例//1.直接调用//Class clazz = Animal.class;//Class clazz = com.atguigu.review.Animal.class//2.调用类对象的实例//Animal animal = new Animal();//Class clazz = animal.getClass();//3调用Class的讲台方法加载器//Class clazz = Class.forName(new String("com.atguigu.review.Animal"));//4.调用类的加载器ClassLoader loader = this.getClass().getClassLoader();Class clazz = loader.loadClass(new String("com.atguigu.review.Animal"));System.out.println(clazz);//2-1创建对应运行时类的对象Object obj = clazz.newInstance();Animal animal = (Animal)obj;System.out.println(animal);//3-1调用制定运行时类的属性 Field name = clazz.getDeclaredField("name");name.setAccessible(true);name.set(animal, "王琪");System.out.println(name.get(animal));Field id = clazz.getDeclaredField("id");id.setAccessible(true);id.setInt(animal, 12);System.out.println(animal);//调用静态的属性Field desc = clazz.getDeclaredField("desc");desc.setAccessible(true);desc.set(animal, "王琪琪");//通过类来调用System.out.println(desc.get(Animal.class));}@Testpublic void Test2()throws Exception{ClassLoader loader = this.getClass().getClassLoader();Class clazz = loader.loadClass("com.atguigu.review.Animal");//调用运行时类的对象的方法Object obj = clazz.newInstance();Animal animal = (Animal)obj;Field name = clazz.getDeclaredField("name");name.setAccessible(true);name.set(animal, "小老鼠");Field age = clazz.getDeclaredField("id");age.setAccessible(true);age.set(animal, 12);System.out.println(animal);Method method = clazz.getMethod("info" , String.class);method.setAccessible(true);System.out.println(method.invoke(animal, "我实际上我没有电话"));Field desc = clazz.getDeclaredField("desc");desc.setAccessible(true);desc.set(Animal.class, "年后回家");Method display = clazz.getDeclaredMethod("display");display.setAccessible(true);System.out.println(display.invoke(Animal.class));}}Java的代理方法—静态代理—反射代理 <img src="http://img.blog.csdn.net/20140825203634586?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvdTAxMjY1MTM4OQ==/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/SouthEast" width="300" height="300" alt="" />1.静态代理方法package com.atguigu.teacher;public class NikeClothFactory implements ClothFactory{@Overridepublic void produceCloth() {System.out.println("Nike工厂生产");}}package com.atguigu.teacher;//经态代理public class TestFactory {public static void main(String[] args) {ClothFactory w = new NikeClothFactory();ProxyClothFactory cf = new ProxyClothFactory(w);cf.produceCloth();}}interface ClothFactory{void produceCloth();}class ProxyClothFactory implements ClothFactory{ClothFactory cf ;public ProxyClothFactory (ClothFactory cf){this.cf = cf ;}@Overridepublic void produceCloth() {System.out.println("代理类获取中介费1000");cf.produceCloth();}}1.动态代理的方法一动态代理是指客户通过代理类来调用其它对象的方法，并且是在程序运行时根据需要动态创建目标类的代理对象。 动态代理使用场合:调试 远程方法调用 代理设计模式的原理:       使用一个代理将对象包装起来, 然后用该代理对象取代原始对象. 任何对原始对象的调用都要通过代理. 代理对象决定是否以及何时将方法调用转到原始对象上 package com.atguigu.teacher;import java.lang.reflect.InvocationHandler;import java.lang.reflect.Method;import java.lang.reflect.Proxy;public class TestActiveFactory {public static void main(String[] args) {MyInvocationHannder handler = new MyInvocationHannder();RealSubject real = new RealSubject();Object obj  = handler.blind(real);//obj即为代理类的对象Subject proxy = (Subject) obj;proxy.action();//使用代理类的对象调用的被重写的抽象方法System.out.println("***********");NikeClothFactory nike = new NikeClothFactory();Object obj1 = handler.blind(nike);ClothFactory proxy1 = (ClothFactory) obj1 ;//Obj1 就是代理类的对象proxy1.produceCloth();}}interface Subject {void action();}//代理类class RealSubject implements Subject {@Overridepublic void action() {System.out.println("QI工厂生产");}}//创建一个实现了InvocationHandler接口的类class MyInvocationHannder implements InvocationHandler {Object obj;//声明的被代理的变量public Object blind(Object obj) {this.obj = obj;//实例化被代理的变量//返回一个与Object 实现了同样的接口的类(即为代理类)return Proxy.newProxyInstance(obj.getClass().getClassLoader(), obj.getClass().getInterfaces(), this);}/*凡是通过代理类的对象调用其实际接口的被重写的抽象方法时 * 都会转换为对如下的Invoke方法的调用 * 此invoke()方法返回值即为被重写的抽象方法的返回值 */@Overridepublic Object invoke(Object proxy, Method method, Object[] args)throws Throwable {Object returnVal = method.invoke(obj, args);return returnVal;}}</span>

<span style="font-size:18px;">package com.atguigu.reflect;import java.lang.reflect.InvocationHandler;import java.lang.reflect.Method;import java.lang.reflect.Proxy;interface Human {void info();void fly();}public class TestAop {public static void main(String[] args) {SuperMan su = new SuperMan();Object obj = MyProxy.getProxyInstance(su);Human h = (Human)obj;h.info();h.fly();}}class SuperMan implements Human {@Overridepublic void info() {System.out.println("我是超人我怕人");}@Overridepublic void fly() {System.out.println("我要飞！！");}}class HumanUtil {public void method1() {System.out.println("-----通用方法1-----");}public void method2() {System.out.println("-----通用方法2-----");}}class MyInvocationHandler2 implements InvocationHandler {Object obj;public void setObject(Object obj) {this.obj = obj;}@Overridepublic Object invoke(Object proxy, Method method, Object[] args)throws Throwable {HumanUtil util =new HumanUtil();util.method1();Object ret = method.invoke(obj, args);util.method2();return ret;}}// 分离class MyProxy {public static Object getProxyInstance(Object obj) {MyInvocationHandler2 handler = new MyInvocationHandler2();handler.setObject(obj);return Proxy.newProxyInstance(obj.getClass().getClassLoader(), obj.getClass().getInterfaces(), handler);}}</span>

<span style="font-size:18px;">1．网络通信package com.atguigu.Net;import java.net.InetAddress;import java.net.UnknownHostException;/* * 1.网络编程中的两个主要问题 * >如何尊却定位网络上的一台或多台主机 *  >找到主机后如何可靠高效的进行数据传输 * 2.实现网络通信的两个要素：①IP地址 ,端口号 ②传输协议 * 3.如何创建一个InetAdress类对象 *  ①调用静态的getByName(String hostName)    *      ①域名 ②分配了一串数值：IP地址 *  ②getLocalHost () 获取本地的地址 *  4.getAdress的常用方法 : getHostName() ; getHostAdress() *  */public class InetAddressTest {public static void main(String[] args) {//实例化InetAddress对象,getByName();InetAddress inet = null;try {inet = InetAddress.getByName("www.atguigu.com");} catch (UnknownHostException e) {e.printStackTrace();}//两个方法的使用：getHostName() getHostAdress()System.out.println(inet);System.out.println(inet.getHostAddress());System.out.println(inet.getHostName());/*******************************/InetAddress inte1  = null;try {inte1 = InetAddress.getByName("42.121.6.2");} catch (UnknownHostException e1) {e1.printStackTrace();}System.out.println(inte1);System.out.println(inte1.getHostAddress());System.out.println(inte1.getHostName());/**********************************/InetAddress inet2 = null;try {inet2 = inet.getLocalHost();} catch (UnknownHostException e) {e.printStackTrace();}System.out.println(inet2);System.out.println(inet2.getHostAddress());System.out.println(inet2.getHostName());}}/*************************************************/package com.atguigu.Net;import java.io.BufferedReader;import java.io.BufferedWriter;import java.io.IOException;import java.io.InputStreamReader;import java.io.OutputStreamWriter;import java.net.InetAddress;import java.net.ServerSocket;import java.net.Socket;import java.net.UnknownHostException;public class TestNet {public static void main(String[] args) {Thread p1 = new Thread(new test1());Thread p2 = new Thread(new test2());Thread p3 = new Thread(new test2());p2.setName("kehu1");p3.setName("kehu2");p1.start();try {Thread.sleep(100);} catch (InterruptedException e) {e.printStackTrace();}p2.start();}}class test1 implements Runnable{public void run(){Server s = new Server(9012);s.read();System.out.println("3333");}}class test2 implements Runnable{public void run(){Client c =null;try {c =new Client(InetAddress.getByName("192.168.0.105") ,9012 );} catch (UnknownHostException e) {e.printStackTrace();}c.getConnect();c.talk();}}class Client{private InetAddress inet ; private int port ; private Socket socket ; public Client (InetAddress inet , int port){this.inet = inet ;this.port = port;System.out.println("客户端 目的地加载完成："+inet+" "+port);}public void getConnect(){try {System.out.println("客户端启动..");socket = new Socket(inet, port);System.out.println("客户端启动完成!");} catch (IOException e) {e.printStackTrace();}System.out.println("连接成功"+inet.getHostName());}public void talk(){BufferedReader bin  = new BufferedReader(new InputStreamReader(System.in)); String str = "";BufferedWriter bw = null;try {bw = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream())); System.out.println("开始通话..");while((str = bin.readLine())!=null){System.out.println(Thread.currentThread().getName());if(str.equalsIgnoreCase("by")){socket.shutdownOutput();break;}bw.write(str);bw.newLine();bw.flush();}} catch (IOException e) {e.printStackTrace();}finally{if(bin!=null){try {bin.close();} catch (IOException e) {e.printStackTrace();}}if(bw!=null){try {bw.close();} catch (IOException e) {e.printStackTrace();}}if(socket!=null){try {socket.close();} catch (IOException e) {e.printStackTrace();}}}}}class Server{ServerSocket serverSocket =null ;Socket socket = null;public Server (int doc){try {System.out.println("服务器加载..");serverSocket =new ServerSocket(9012);socket =serverSocket.accept();} catch (IOException e) {e.printStackTrace();}    System.out.println("waiting..");}public void read(){BufferedReader bin =null;try {bin = new BufferedReader(new InputStreamReader(socket.getInputStream()));} catch (IOException e1) {e1.printStackTrace();}String str = null;try {while((str = bin.readLine())!=null){System.out.println(str+"-->"+socket.getInetAddress().getHostName());}} catch (IOException e) {e.printStackTrace();}finally{if(bin!=null){try {bin.close();} catch (IOException e) {e.printStackTrace();}}if(socket!=null){try {socket.close();} catch (IOException e) {e.printStackTrace();}}if(serverSocket!=null){try {serverSocket.close();} catch (IOException e) {e.printStackTrace();}}}}}/******************************************************************/package com.atguigu.Net;import java.net.Socket;public interface Writer {Socket getSocket();}package com.atguigu.Net;import java.net.Socket;public interface Lisener {Socket getSocket();}package com.atguigu.Net;import java.io.IOException;import java.io.OutputStream;import java.net.InetAddress;import java.net.Socket;public class Clinet2 implements Lisener , Writer{private Socket socket = null;private InetAddress inet = null;private int code ;public Clinet2(InetAddress inet , int codde){this.inet = inet;this.code = codde;try {socket = new Socket(inet , code);} catch (IOException e) {e.printStackTrace();}System.out.println("建立客户端...");}public Socket getSocket() {return socket;}public void setSocket(Socket socket) {this.socket = socket;}public InetAddress getInet() {return inet;}public void setInet(InetAddress inet) {this.inet = inet;}public int getCode() {return code;}public void setCode(int code) {this.code = code;}}package com.atguigu.Net;import java.io.IOException;import java.io.InputStream;import java.net.ServerSocket;import java.net.Socket;public class Server2 implements Lisener , Writer{ServerSocket serverSocket2 =null ;int codde ; Socket socket ;public Server2( int codde){this.codde = codde ;try {serverSocket2 = new ServerSocket( codde );} catch (IOException e) {e.printStackTrace();}System.out.println("建立服务器..");try {socket = serverSocket2.accept();} catch (IOException e) {e.printStackTrace();}System.out.println("建立服务器完成..");}public ServerSocket getServerSocket2() {return serverSocket2;}public void setServerSocket2(ServerSocket serverSocket2) {this.serverSocket2 = serverSocket2;}public int getCodde() {return codde;}public void setCodde(int codde) {this.codde = codde;}@Overridepublic Socket getSocket() {return socket;}}package com.atguigu.Net;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.net.Socket;public class ClentReadThread implements Runnable{private Lisener client =null;private InputStream in =null ;private BufferedReader bn = null;private Socket socket;public ClentReadThread (Lisener client){this.client = client;socket = client.getSocket();System.out.println("listener waiting..");}public void run(){try {in =socket.getInputStream();} catch (IOException e) {e.printStackTrace();}   listener();}public synchronized void listener(){try {in =socket.getInputStream();} catch (IOException e) {e.printStackTrace();}bn = new BufferedReader(new InputStreamReader(in));String str = null;System.out.println(Thread.currentThread().getName()+" listen..");try {while(true){str = bn.readLine();if(str.equalsIgnoreCase("by")){socket.shutdownInput();break;}System.out.println(Thread.currentThread().getName()+":"+str);}} catch (IOException e) {}}}package com.atguigu.Net;import java.io.BufferedReader;import java.io.BufferedWriter;import java.io.IOException;import java.io.InputStreamReader;import java.io.OutputStream;import java.io.OutputStreamWriter;import java.net.Socket;public class ClentWriterThread implements Runnable{private Writer client =null;private OutputStream out =null ;private BufferedWriter bn = null;private Socket socket;public ClentWriterThread (Writer client){this.client = client;socket = client.getSocket();System.out.println("Socket联接");}public void run(){System.out.println("开..");try {out =socket.getOutputStream();} catch (IOException e) {e.printStackTrace();} writer();}public synchronized void writer(){System.out.println("开..");try {out =socket.getOutputStream();} catch (IOException e) {e.printStackTrace();}BufferedReader bin = new BufferedReader(new InputStreamReader(System.in));bn = new BufferedWriter(new OutputStreamWriter(out));String str = "hehe!!";try {while((str = bin.readLine())!=null){if(str.equalsIgnoreCase("by")){socket.shutdownOutput();break;}try {bn.write(str);bn.newLine();bn.flush();} catch (IOException e) {e.printStackTrace();}}} catch (IOException e) {e.printStackTrace();}}}package com.atguigu.Net;import java.net.InetAddress;import java.net.UnknownHostException;import org.junit.Test;//2.客户端给服务端发送信息，服务端收到信息打印到控制台，public class TestNet2 {Server2 server ;@Testpublic void Servered() { server = new Server2(9090);new ClentReadThread(server).listener();//Thread serverlisenner = new Thread(new ClentReadThread(server));//serverlisenner.setName("serverlisenner");//serverlisenner.start();//System.out.println("serverlisenner..begin");}@Testpublic void Clindered(){Clinet2 clinder = null ;try {clinder = new Clinet2(InetAddress.getLocalHost(),9090);} catch (UnknownHostException e) {e.printStackTrace();}new ClentWriterThread(clinder).writer();//Thread ClinderWriter = new Thread(new ClentWriterThread(clinder));//ClinderWriter.setName("ClinderWriter");//ClinderWriter.start();//System.out.println("ClinderWriter..begin");}}</span>