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java 各种 proxy 示例

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YunaiV
2020-09-09 22:08:09 +08:00
parent c85002f18b
commit 69a9807e81
13 changed files with 206 additions and 4 deletions
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8
README.md
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@@ -397,10 +397,10 @@
如下是草稿目录，未来需要整理下
# lab-9
记录阅读极客时间《数据结构与算法之美》的题目。
# lab-50
Email 示例
# lab-69-proxy
动态代理

22
lab-69-proxy/lab-69-proxy-cglib/pom.xml Normal file
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<?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>lab-69</artifactId>
<groupId>cn.iocoder.springboot.labs</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>lab-69-proxy-cglib</artifactId>
<dependencies>
<dependency>
<groupId>cglib</groupId>
<artifactId>cglib</artifactId>
<version>3.3.0</version>
</dependency>
</dependencies>
</project>

19
lab-69-proxy/lab-69-proxy-cglib/src/main/java/cn/iocoder/springboot/labs/lab69/TestProxyMain.java Normal file
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package cn.iocoder.springboot.labs.lab69;
import cn.iocoder.springboot.labs.lab69.intercept.UserServiceMethodInterceptor;
import cn.iocoder.springboot.labs.lab69.service.UserServiceImpl;
import net.sf.cglib.proxy.Enhancer;
public class TestProxyMain {
public static void main(String[] args) {
// 创建 cglib 增强对象
Enhancer enhancer = new Enhancer();
enhancer.setSuperclass(UserServiceImpl.class); // 设置父类
enhancer.setCallback(new UserServiceMethodInterceptor());
// 创建代理
UserServiceImpl userService = (UserServiceImpl) enhancer.create();
userService.create("yunai", "buzhidao");
}
}

17
lab-69-proxy/lab-69-proxy-cglib/src/main/java/cn/iocoder/springboot/labs/lab69/intercept/UserServiceMethodInterceptor.java Normal file
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package cn.iocoder.springboot.labs.lab69.intercept;
import net.sf.cglib.proxy.MethodInterceptor;
import net.sf.cglib.proxy.MethodProxy;
import java.lang.reflect.Method;
public class UserServiceMethodInterceptor implements MethodInterceptor {
public Object intercept(Object object, Method method, Object[] args, MethodProxy methodProxy) throws Throwable {
System.out.println("before invoke");
Object ret = methodProxy.invokeSuper(object, args);
System.out.println("after invoke");
return ret;
}
}

9
lab-69-proxy/lab-69-proxy-cglib/src/main/java/cn/iocoder/springboot/labs/lab69/service/UserServiceImpl.java Normal file
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package cn.iocoder.springboot.labs.lab69.service;
public class UserServiceImpl {
public void create(String username, String password) {
System.out.println(String.format("登陆的用户名(%s) 密码(%s)", username, password));
}
}

22
lab-69-proxy/lab-69-proxy-jdk/pom.xml Normal file
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<?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>lab-69</artifactId>
<groupId>cn.iocoder.springboot.labs</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>lab-69-proxy-jdk</artifactId>
<dependencies>
<dependency>
<groupId>commons-io</groupId>
<artifactId>commons-io</artifactId>
<version>2.7</version>
</dependency>
</dependencies>
</project>

25
lab-69-proxy/lab-69-proxy-jdk/src/main/java/cn/iocoder/springboot/labs/lab69/GenerateProxyMain.java Normal file
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package cn.iocoder.springboot.labs.lab69;
import cn.iocoder.springboot.labs.lab69.service.UserServiceImpl;
import org.apache.commons.io.IOUtils;
import sun.misc.ProxyGenerator;
import java.io.FileOutputStream;
import java.io.IOException;
import java.lang.reflect.Proxy;
/**
* 生成 JDK {@link Proxy} 的示例代码
*
* 生成后，我们可以反编译查看具体的类
*/
public class GenerateProxyMain {
public static void main(String[] args) throws IOException {
// 生成字节码
byte[] classFile = ProxyGenerator.generateProxyClass("$Proxy11", UserServiceImpl.class.getInterfaces());
// 写入到磁盘
IOUtils.write(classFile, new FileOutputStream("/Users/yunai/ls/$Proxy11.class"));
}
}

26
lab-69-proxy/lab-69-proxy-jdk/src/main/java/cn/iocoder/springboot/labs/lab69/TestProxyMain.java Normal file
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package cn.iocoder.springboot.labs.lab69;
import cn.iocoder.springboot.labs.lab69.handler.UserServiceHandler;
import cn.iocoder.springboot.labs.lab69.service.UserService;
import cn.iocoder.springboot.labs.lab69.service.UserServiceImpl;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Proxy;
/**
* 使用 JDK {@link Proxy} 实现一个动态代理的示例
*/
public class TestProxyMain {
public static void main(String[] args) {
// 创建 UserService 对象
UserService userService = new UserServiceImpl();
// JDK 处理器
InvocationHandler handler = new UserServiceHandler(userService);
// 创建代理
UserService userServiceProxy = (UserService) Proxy.newProxyInstance(TestProxyMain.class.getClassLoader(), userService.getClass().getInterfaces(), handler);
// 执行
userServiceProxy.create("yunai", "buzhidao");
}
}

24
lab-69-proxy/lab-69-proxy-jdk/src/main/java/cn/iocoder/springboot/labs/lab69/handler/UserServiceHandler.java Normal file
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package cn.iocoder.springboot.labs.lab69.handler;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
public class UserServiceHandler implements InvocationHandler {
/**
* 被代理的对象
*/
private final Object object;
public UserServiceHandler(Object object) {
this.object = object;
}
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
System.out.println("before invoke");
Object ret = method.invoke(object, args);
System.out.println("after invoke");
return ret;
}
}

7
lab-69-proxy/lab-69-proxy-jdk/src/main/java/cn/iocoder/springboot/labs/lab69/service/UserService.java Normal file
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package cn.iocoder.springboot.labs.lab69.service;
public interface UserService {
void create(String username, String password);
}

9
lab-69-proxy/lab-69-proxy-jdk/src/main/java/cn/iocoder/springboot/labs/lab69/service/UserServiceImpl.java Normal file
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package cn.iocoder.springboot.labs.lab69.service;
public class UserServiceImpl implements UserService {
public void create(String username, String password) {
System.out.println(String.format("登陆的用户名(%s) 密码(%s)", username, password));
}
}

20
lab-69-proxy/pom.xml Normal file
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<?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>labs-parent</artifactId>
<groupId>cn.iocoder.springboot.labs</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>lab-69</artifactId>
<packaging>pom</packaging>
<modules>
<module>lab-69-proxy-jdk</module>
<module>lab-69-proxy-cglib</module>
</modules>
</project>

2
pom.xml
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@@ -76,6 +76,8 @@
<!-- <module>lab-66</module>-->
<!-- <module>lab-67</module>-->
<!-- <module>lab-68-spring-security-oauth</module>-->
<module>lab-69-proxy</module>
<!-- Spring Cloud 示例 -->
<!-- <module>labx-01-spring-cloud-alibaba-nacos-discovery</module>-->