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Java内容重新整理删除过期的东西
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estom
83
Java/JavaDemo/jdk-demo/DynamicProxy/pom.xml
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83
Java/JavaDemo/jdk-demo/DynamicProxy/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" 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>JdkDemo</artifactId>
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<groupId>org.example</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>DynamicProxy</artifactId>
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<name>DynamicProxy</name>
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<!-- FIXME change it to the project's website -->
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<url>http://www.example.com</url>
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<properties>
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<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
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<maven.compiler.source>1.7</maven.compiler.source>
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<maven.compiler.target>1.7</maven.compiler.target>
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</properties>
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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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<dependency>
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<groupId>junit</groupId>
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<artifactId>junit</artifactId>
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<version>4.11</version>
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<scope>test</scope>
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</dependency>
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</dependencies>
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<build>
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<pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
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<plugins>
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<!-- clean lifecycle, see https://maven.apache.org/ref/current/maven-core/lifecycles.html#clean_Lifecycle -->
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<plugin>
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<artifactId>maven-clean-plugin</artifactId>
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<version>3.1.0</version>
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</plugin>
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<!-- default lifecycle, jar packaging: see https://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_jar_packaging -->
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<plugin>
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<artifactId>maven-resources-plugin</artifactId>
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<version>3.0.2</version>
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</plugin>
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<plugin>
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<artifactId>maven-compiler-plugin</artifactId>
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<version>3.8.0</version>
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</plugin>
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<plugin>
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<artifactId>maven-surefire-plugin</artifactId>
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<version>2.22.1</version>
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</plugin>
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<plugin>
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<artifactId>maven-jar-plugin</artifactId>
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<version>3.0.2</version>
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</plugin>
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<plugin>
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<artifactId>maven-install-plugin</artifactId>
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<version>2.5.2</version>
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</plugin>
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<plugin>
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<artifactId>maven-deploy-plugin</artifactId>
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<version>2.8.2</version>
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</plugin>
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<!-- site lifecycle, see https://maven.apache.org/ref/current/maven-core/lifecycles.html#site_Lifecycle -->
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<plugin>
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<artifactId>maven-site-plugin</artifactId>
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<version>3.7.1</version>
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</plugin>
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<plugin>
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<artifactId>maven-project-info-reports-plugin</artifactId>
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<version>3.0.0</version>
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</plugin>
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</plugins>
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</pluginManagement>
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</build>
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</project>
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package com.ykl.proxy;
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import com.ykl.proxy.handler.LogInterceptor;
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import com.ykl.proxy.service.UserService;
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import net.sf.cglib.proxy.Enhancer;
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public class CglibDynamicProxy {
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public static void main(String[] args) {
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LogInterceptor logInterceptor = new LogInterceptor();
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Enhancer enhancer = new Enhancer();
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enhancer.setSuperclass(UserService.class); // 设置超类，cglib是通过继承来实现的
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enhancer.setCallback(logInterceptor);
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UserService userService = (UserService)enhancer.create(); // 创建代理类
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userService.update();
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userService.select();
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}
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}
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package com.ykl.proxy;
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import com.ykl.proxy.handler.LogHandler;
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import com.ykl.proxy.service.UserService;
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import com.ykl.proxy.service.UserServiceImpl;
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import java.lang.reflect.InvocationHandler;
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import java.lang.reflect.Proxy;
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public class DynamicProxy {
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public static void main(String[] args) throws IllegalAccessException, InstantiationException {
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// 设置变量可以保存动态代理类，默认名称以 $Proxy0 格式命名
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// System.getProperties().setProperty("sun.misc.ProxyGenerator.saveGeneratedFiles", "true");
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// 1. 创建被代理的对象，UserService接口的实现类
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UserServiceImpl userServiceImpl = new UserServiceImpl();
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// 2. 获取对应的 ClassLoader
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ClassLoader classLoader = userServiceImpl.getClass().getClassLoader();
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// 3. 获取所有接口的Class，这里的UserServiceImpl只实现了一个接口UserService，
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Class[] interfaces = userServiceImpl.getClass().getInterfaces();
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// 4. 创建一个将传给代理类的调用请求处理器，处理所有的代理对象上的方法调用
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// 这里创建的是一个自定义的日志处理器，须传入实际的执行对象 userServiceImpl
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InvocationHandler logHandler = new LogHandler(userServiceImpl);
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/*
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5.根据上面提供的信息，创建代理对象 在这个过程中，
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a.JDK会通过根据传入的参数信息动态地在内存中创建和.class 文件等同的字节码
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b.然后根据相应的字节码转换成对应的class，
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c.然后调用newInstance()创建代理实例
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*/
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UserService proxy = (UserService) Proxy.newProxyInstance(classLoader, interfaces, logHandler);
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// 调用代理的方法
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proxy.select();
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proxy.update();
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// 保存JDK动态代理生成的代理类，类名保存为 UserServiceProxy
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// ProxyUtils.generateClassFile(userServiceImpl.getClass(), "UserServiceProxy");
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}
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}
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package com.ykl.proxy.handler;
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import java.lang.reflect.InvocationHandler;
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import java.lang.reflect.Method;
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import java.util.Date;
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public class LogHandler implements InvocationHandler {
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Object target; // 被代理的对象，实际的方法执行者
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public LogHandler(Object target) {
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this.target = target;
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}
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@Override
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public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
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before();
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Object result = method.invoke(target, args); // 调用 target 的 method 方法
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after();
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return result; // 返回方法的执行结果
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}
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// 调用invoke方法之前执行
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private void before() {
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System.out.println(String.format("log start time [%s] ", new Date()));
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}
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// 调用invoke方法之后执行
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private void after() {
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System.out.println(String.format("log end time [%s] ", new Date()));
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}
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}
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package com.ykl.proxy.handler;
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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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import java.util.Date;
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public class LogInterceptor implements MethodInterceptor {
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/**
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* @param object 表示要进行增强的对象
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* @param method 表示拦截的方法
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* @param objects 数组表示参数列表，基本数据类型需要传入其包装类型，如int-->Integer、long-Long、double-->Double
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* @param methodProxy 表示对方法的代理，invokeSuper方法表示对被代理对象方法的调用
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* @return 执行结果
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* @throws Throwable
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*/
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@Override
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public Object intercept(Object object, Method method, Object[] objects, MethodProxy methodProxy) throws Throwable {
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before();
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Object result = methodProxy.invokeSuper(object, objects); // 注意这里是调用 invokeSuper 而不是 invoke，否则死循环，methodProxy.invokesuper执行的是原始类的方法，method.invoke执行的是子类的方法
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after();
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return result;
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}
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private void before() {
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System.out.println(String.format("log start time [%s] ", new Date()));
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}
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private void after() {
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System.out.println(String.format("log end time [%s] ", new Date()));
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}
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}
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package com.ykl.proxy.service;
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public interface UserService {
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void select();
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void update();
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}
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package com.ykl.proxy.service;
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public class UserServiceImpl implements UserService {
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@Override
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public void select() {
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System.out.println("selecting");
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}
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@Override
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public void update() {
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System.out.println("updating");
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}
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}
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package org.example;
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import static org.junit.Assert.assertTrue;
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import org.junit.Test;
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/**
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* Unit test for simple App.
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*/
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public class AppTest
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{
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/**
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* Rigorous Test :-)
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*/
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@Test
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public void shouldAnswerWithTrue()
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{
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assertTrue( true );
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}
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}
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79
Java/JavaDemo/jdk-demo/pom.xml
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79
Java/JavaDemo/jdk-demo/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" 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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<modelVersion>4.0.0</modelVersion>
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<groupId>org.example</groupId>
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<artifactId>JdkDemo</artifactId>
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<packaging>pom</packaging>
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<version>1.0-SNAPSHOT</version>
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<modules>
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<module>DynamicProxy</module>
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</modules>
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<name>JdkDemo</name>
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<!-- FIXME change it to the project's website -->
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<url>http://www.example.com</url>
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<properties>
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<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
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<maven.compiler.source>1.7</maven.compiler.source>
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<maven.compiler.target>1.7</maven.compiler.target>
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</properties>
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<dependencies>
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<dependency>
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<groupId>junit</groupId>
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<artifactId>junit</artifactId>
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<version>4.11</version>
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<scope>test</scope>
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</dependency>
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</dependencies>
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<build>
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<pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
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<plugins>
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<!-- clean lifecycle, see https://maven.apache.org/ref/current/maven-core/lifecycles.html#clean_Lifecycle -->
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<plugin>
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<artifactId>maven-clean-plugin</artifactId>
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<version>3.1.0</version>
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</plugin>
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<!-- default lifecycle, jar packaging: see https://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_jar_packaging -->
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<plugin>
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<artifactId>maven-resources-plugin</artifactId>
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<version>3.0.2</version>
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</plugin>
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<plugin>
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<artifactId>maven-compiler-plugin</artifactId>
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<version>3.8.0</version>
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</plugin>
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<plugin>
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<artifactId>maven-surefire-plugin</artifactId>
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<version>2.22.1</version>
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</plugin>
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<plugin>
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<artifactId>maven-jar-plugin</artifactId>
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<version>3.0.2</version>
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</plugin>
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<plugin>
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<artifactId>maven-install-plugin</artifactId>
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<version>2.5.2</version>
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</plugin>
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<plugin>
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<artifactId>maven-deploy-plugin</artifactId>
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<version>2.8.2</version>
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</plugin>
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<!-- site lifecycle, see https://maven.apache.org/ref/current/maven-core/lifecycles.html#site_Lifecycle -->
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<plugin>
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<artifactId>maven-site-plugin</artifactId>
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<version>3.7.1</version>
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</plugin>
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<plugin>
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<artifactId>maven-project-info-reports-plugin</artifactId>
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<version>3.0.0</version>
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</plugin>
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</plugins>
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</pluginManagement>
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</build>
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</project>
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13
Java/JavaDemo/jdk-demo/src/main/java/org/example/App.java
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13
Java/JavaDemo/jdk-demo/src/main/java/org/example/App.java
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package org.example;
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/**
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* Hello world!
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*
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*/
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public class App
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{
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public static void main( String[] args )
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{
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System.out.println( "Hello World!" );
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}
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}
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@@ -0,0 +1,20 @@
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package org.example;
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import static org.junit.Assert.assertTrue;
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import org.junit.Test;
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/**
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* Unit test for simple App.
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*/
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public class AppTest
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{
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/**
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* Rigorous Test :-)
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*/
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@Test
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public void shouldAnswerWithTrue()
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{
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assertTrue( true );
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}
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}
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