first commit

.gitignore

@@ -1,3 +1,4 @@
+/.idea/
 # ---> Java
 # Compiled class file
 *.class

dynamic-proxy/pom.xml

@@ -0,0 +1,27 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <parent>
+        <artifactId>JavaBasiceDemo</artifactId>
+        <groupId>com.wyl.example</groupId>
+        <version>1.0-SNAPSHOT</version>
+        <relativePath>../pom.xml</relativePath>
+
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>dynamic-proxy</artifactId>
+
+    <properties>
+        <maven.compiler.source>8</maven.compiler.source>
+        <maven.compiler.target>8</maven.compiler.target>
+    </properties>
+    <dependencies>
+        <dependency>
+            <groupId>cglib</groupId>
+            <artifactId>cglib</artifactId>
+        </dependency>
+    </dependencies>
+
+</project>

dynamic-proxy/src/main/java/com/wyl/demo/proxy/cglib/CglibProxyFactory.java

@@ -0,0 +1,19 @@
+package com.wyl.demo.proxy.cglib;
+
+import net.sf.cglib.proxy.Enhancer;
+
+public class CglibProxyFactory {
+
+    public static Object getProxy(Class<?> clazz) {
+        // 创建动态代理增强类
+        Enhancer enhancer = new Enhancer();
+        // 设置类加载器
+        enhancer.setClassLoader(clazz.getClassLoader());
+        // 设置被代理类
+        enhancer.setSuperclass(clazz);
+        // 设置方法拦截器
+        enhancer.setCallback(new DebugMethodInterceptor());
+        // 创建代理类
+        return enhancer.create();
+    }
+}

dynamic-proxy/src/main/java/com/wyl/demo/proxy/cglib/DebugMethodInterceptor.java

@@ -0,0 +1,23 @@
+package com.wyl.demo.proxy.cglib;
+
+import net.sf.cglib.proxy.MethodInterceptor;
+import net.sf.cglib.proxy.MethodProxy;
+
+import java.lang.reflect.Method;
+
+/**
+ * 自定义MethodInterceptor
+ */
+public class DebugMethodInterceptor implements MethodInterceptor {
+    @Override
+    public Object intercept(Object o, Method method, Object[] args, MethodProxy methodProxy) throws Throwable {
+        //调用方法之前，我们可以添加自己的操作
+        System.out.println("cglib before method " + method.getName());
+        // 调用被代理类的原有方法
+        Object object = methodProxy.invokeSuper(o, args);
+        //调用方法之后，我们同样可以添加自己的操作
+        System.out.println("cglib after method " + method.getName());
+        return object;
+    }
+
+}

dynamic-proxy/src/main/java/com/wyl/demo/proxy/cglib/Main.java

@@ -0,0 +1,17 @@
+package com.wyl.demo.proxy.cglib;
+
+import net.sf.cglib.proxy.Enhancer;
+
+public class Main {
+    public static void main(String[] args) {
+        Enhancer enhancer = new Enhancer();
+        // 设置类加载器
+        enhancer.setClassLoader(MessageService.class.getClassLoader());
+        // 设置被代理类
+        enhancer.setSuperclass(MessageService.class);
+        // 设置方法拦截器
+        enhancer.setCallback(new DebugMethodInterceptor());
+        MessageService messageService = (MessageService) enhancer.create();
+        messageService.send("wyl");
+    }
+}

dynamic-proxy/src/main/java/com/wyl/demo/proxy/cglib/MessageService.java

@@ -0,0 +1,8 @@
+package com.wyl.demo.proxy.cglib;
+
+public class MessageService {
+    public String send(String message) {
+        System.out.println("send message:" + message);
+        return message;
+    }
+}

dynamic-proxy/src/main/java/com/wyl/demo/proxy/java/DebugInvocationHandler.java

@@ -0,0 +1,27 @@
+package com.wyl.demo.proxy.java;
+
+import java.lang.reflect.InvocationHandler;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+
+public class DebugInvocationHandler implements InvocationHandler {
+    /**
+     * 代理类中的真实对象
+     */
+    private final Object target;
+
+    public DebugInvocationHandler(Object target) {
+        this.target = target;
+    }
+
+    @Override
+    public Object invoke(Object proxy, Method method, Object[] args) throws InvocationTargetException, IllegalAccessException {
+        //调用方法之前，我们可以添加自己的操作
+        System.out.println("java before method " + method.getName());
+        // 调用被代理类的原有方法
+        Object result = method.invoke(target, args);
+        //调用方法之后，我们同样可以添加自己的操作
+        System.out.println("java after method " + method.getName());
+        return result;
+    }
+}

dynamic-proxy/src/main/java/com/wyl/demo/proxy/java/Main.java

@@ -0,0 +1,15 @@
+package com.wyl.demo.proxy.java;
+
+import java.lang.reflect.Proxy;
+
+public class Main {
+    public static void main(String[] args) {
+        MessageServiceImpl messageServiceImpl = new MessageServiceImpl();
+        MessageService messageServiceProxy = (MessageService) Proxy.newProxyInstance(messageServiceImpl.getClass()
+                                                                                                       .getClassLoader(), // 目标类的类加载
+                messageServiceImpl.getClass()
+                                  .getInterfaces(),  // 代理需要实现的接口，可指定多个
+                new DebugInvocationHandler(messageServiceImpl));
+        messageServiceProxy.send("java");
+    }
+}

dynamic-proxy/src/main/java/com/wyl/demo/proxy/java/MessageService.java

@@ -0,0 +1,5 @@
+package com.wyl.demo.proxy.java;
+
+public interface MessageService {
+    String send(String message);
+}

dynamic-proxy/src/main/java/com/wyl/demo/proxy/java/MessageServiceImpl.java

@@ -0,0 +1,8 @@
+package com.wyl.demo.proxy.java;
+
+public class MessageServiceImpl implements MessageService {
+    public String send(String message) {
+        System.out.println("send message:" + message);
+        return message;
+    }
+}

pom.xml

@@ -0,0 +1,28 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>com.wyl.example</groupId>
+    <artifactId>JavaBasiceDemo</artifactId>
+    <version>1.0-SNAPSHOT</version>
+    <modules>
+        <module>dynamic-proxy</module>
+    </modules>
+    <packaging>pom</packaging>
+    <properties>
+        <maven.compiler.source>8</maven.compiler.source>
+        <maven.compiler.target>8</maven.compiler.target>
+    </properties>
+    <dependencyManagement>
+        <dependencies>
+            <dependency>
+                <groupId>cglib</groupId>
+                <artifactId>cglib</artifactId>
+                <version>3.3.0</version>
+            </dependency>
+        </dependencies>
+    </dependencyManagement>
+
+</project>