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YunaiV
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java 各种 proxy 示例
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‎README.md

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如下是草稿目录，未来需要整理下
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# lab-9
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记录阅读极客时间《数据结构与算法之美》的题目。
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# lab-50
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Email 示例
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# lab-69-proxy
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动态代理

‎lab-69-proxy/lab-69-proxy-cglib/pom.xml

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<parent>
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<artifactId>lab-69</artifactId>
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<groupId>cn.iocoder.springboot.labs</groupId>
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<version>1.0-SNAPSHOT</version>
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</parent>
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<modelVersion>4.0.0</modelVersion>
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<artifactId>lab-69-proxy-cglib</artifactId>
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<dependencies>
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<dependency>
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<groupId>cglib</groupId>
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<artifactId>cglib</artifactId>
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<version>3.3.0</version>
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</dependency>
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</dependencies>
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</project>

‎lab-69-proxy/lab-69-proxy-cglib/src/main/java/cn/iocoder/springboot/labs/lab69/TestProxyMain.java

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package cn.iocoder.springboot.labs.lab69;
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import cn.iocoder.springboot.labs.lab69.intercept.UserServiceMethodInterceptor;
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import cn.iocoder.springboot.labs.lab69.service.UserServiceImpl;
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import net.sf.cglib.proxy.Enhancer;
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public class TestProxyMain {
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public static void main(String[] args) {
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// 创建 cglib 增强对象
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Enhancer enhancer = new Enhancer();
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enhancer.setSuperclass(UserServiceImpl.class); // 设置父类
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enhancer.setCallback(new UserServiceMethodInterceptor());
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// 创建代理
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UserServiceImpl userService = (UserServiceImpl) enhancer.create();
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userService.create("yunai", "buzhidao");
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}
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}

‎lab-69-proxy/lab-69-proxy-cglib/src/main/java/cn/iocoder/springboot/labs/lab69/intercept/UserServiceMethodInterceptor.java

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package cn.iocoder.springboot.labs.lab69.intercept;
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import net.sf.cglib.proxy.MethodInterceptor;
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import net.sf.cglib.proxy.MethodProxy;
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import java.lang.reflect.Method;
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public class UserServiceMethodInterceptor implements MethodInterceptor {
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public Object intercept(Object object, Method method, Object[] args, MethodProxy methodProxy) throws Throwable {
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System.out.println("before invoke");
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Object ret = methodProxy.invokeSuper(object, args);
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System.out.println("after invoke");
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return ret;
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}
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}

‎lab-69-proxy/lab-69-proxy-cglib/src/main/java/cn/iocoder/springboot/labs/lab69/service/UserServiceImpl.java

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package cn.iocoder.springboot.labs.lab69.service;
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public class UserServiceImpl {
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public void create(String username, String password) {
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System.out.println(String.format("登陆的用户名(%s) 密码(%s)", username, password));
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}
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}

‎lab-69-proxy/lab-69-proxy-jdk/pom.xml

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<parent>
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<artifactId>lab-69</artifactId>
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<groupId>cn.iocoder.springboot.labs</groupId>
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<version>1.0-SNAPSHOT</version>
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</parent>
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<modelVersion>4.0.0</modelVersion>
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<artifactId>lab-69-proxy-jdk</artifactId>
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<dependencies>
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<dependency>
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<groupId>commons-io</groupId>
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<artifactId>commons-io</artifactId>
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<version>2.7</version>
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</dependency>
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</dependencies>
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</project>

‎lab-69-proxy/lab-69-proxy-jdk/src/main/java/cn/iocoder/springboot/labs/lab69/GenerateProxyMain.java

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package cn.iocoder.springboot.labs.lab69;
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import cn.iocoder.springboot.labs.lab69.service.UserServiceImpl;
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import org.apache.commons.io.IOUtils;
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import sun.misc.ProxyGenerator;
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import java.io.FileOutputStream;
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import java.io.IOException;
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import java.lang.reflect.Proxy;
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/**
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* 生成 JDK {@link Proxy} 的示例代码
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*
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* 生成后，我们可以反编译查看具体的类
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*/
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public class GenerateProxyMain {
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public static void main(String[] args) throws IOException {
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// 生成字节码
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byte[] classFile = ProxyGenerator.generateProxyClass("$Proxy11", UserServiceImpl.class.getInterfaces());
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// 写入到磁盘
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IOUtils.write(classFile, new FileOutputStream("/Users/yunai/ls/$Proxy11.class"));
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}
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}

‎lab-69-proxy/lab-69-proxy-jdk/src/main/java/cn/iocoder/springboot/labs/lab69/TestProxyMain.java

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package cn.iocoder.springboot.labs.lab69;
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import cn.iocoder.springboot.labs.lab69.handler.UserServiceHandler;
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import cn.iocoder.springboot.labs.lab69.service.UserService;
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import cn.iocoder.springboot.labs.lab69.service.UserServiceImpl;
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import java.lang.reflect.InvocationHandler;
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import java.lang.reflect.Proxy;
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/**
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* 使用 JDK {@link Proxy} 实现一个动态代理的示例
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*/
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public class TestProxyMain {
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public static void main(String[] args) {
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// 创建 UserService 对象
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UserService userService = new UserServiceImpl();
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// JDK 处理器
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InvocationHandler handler = new UserServiceHandler(userService);
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// 创建代理
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UserService userServiceProxy = (UserService) Proxy.newProxyInstance(TestProxyMain.class.getClassLoader(), userService.getClass().getInterfaces(), handler);
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// 执行
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userServiceProxy.create("yunai", "buzhidao");
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}
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}

‎lab-69-proxy/lab-69-proxy-jdk/src/main/java/cn/iocoder/springboot/labs/lab69/handler/UserServiceHandler.java

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package cn.iocoder.springboot.labs.lab69.handler;
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import java.lang.reflect.InvocationHandler;
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import java.lang.reflect.Method;
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public class UserServiceHandler implements InvocationHandler {
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/**
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* 被代理的对象
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*/
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private final Object object;
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public UserServiceHandler(Object object) {
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this.object = object;
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}
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public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
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System.out.println("before invoke");
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Object ret = method.invoke(object, args);
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System.out.println("after invoke");
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return ret;
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}
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}

‎lab-69-proxy/lab-69-proxy-jdk/src/main/java/cn/iocoder/springboot/labs/lab69/service/UserService.java

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package cn.iocoder.springboot.labs.lab69.service;
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public interface UserService {
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void create(String username, String password);
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}

‎lab-69-proxy/lab-69-proxy-jdk/src/main/java/cn/iocoder/springboot/labs/lab69/service/UserServiceImpl.java

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package cn.iocoder.springboot.labs.lab69.service;
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public class UserServiceImpl implements UserService {
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public void create(String username, String password) {
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System.out.println(String.format("登陆的用户名(%s) 密码(%s)", username, password));
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}
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}

‎lab-69-proxy/pom.xml

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<parent>
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<artifactId>labs-parent</artifactId>
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<groupId>cn.iocoder.springboot.labs</groupId>
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<version>1.0-SNAPSHOT</version>
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</parent>
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<modelVersion>4.0.0</modelVersion>
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<artifactId>lab-69</artifactId>
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<packaging>pom</packaging>
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<modules>
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<module>lab-69-proxy-jdk</module>
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<module>lab-69-proxy-cglib</module>
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</modules>
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</project>

‎pom.xml

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<!-- <module>lab-66</module>-->
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<!-- <module>lab-67</module>-->
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<!-- <module>lab-68-spring-security-oauth</module>-->
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<module>lab-69-proxy</module>
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<!-- Spring Cloud 示例 -->
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<!-- <module>labx-01-spring-cloud-alibaba-nacos-discovery</module>-->

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