jdk动态代理和cglib动态代理
2、CountImpl.java
package net.battier.dao.impl;import net.battier.dao.Count;/*** 委托类(包含业务逻辑)** @author Administrator**/public class CountImpl implements Count {@Overridepublic void queryCount() {System.out.println("查看账户方法...");}@Overridepublic void updateCount() {System.out.println("修改账户方法...");}}、CountProxy.javapackage net.battier.dao.impl;import net.battier.dao.Count;/*** 这是一个代理类（增强CountImpl实现类）** @author Administrator**/public class CountProxy implements Count {private CountImpl countImpl;/*** 覆盖默认构造器** @param countImpl*/public CountProxy(CountImpl countImpl) {this.countImpl = countImpl;}@Overridepublic void queryCount() {System.out.println("事务处理之前");// 调用委托类的方法;countImpl.queryCount();System.out.println("事务处理之后");}@Overridepublic void updateCount() {System.out.println("事务处理之前");// 调用委托类的方法;countImpl.updateCount();System.out.println("事务处理之后");}}
3、TestCount.java
package net.battier.test;import net.battier.dao.impl.CountImpl;import net.battier.dao.impl.CountProxy;/***测试Count类** @author Administrator**/public class TestCount {public static void main(String[] args) {CountImpl countImpl = new CountImpl();CountProxy countProxy = new CountProxy(countImpl);countProxy.updateCount();countProxy.queryCount();}}
package net.battier.dao.impl;import net.battier.dao.BookFacade;public class BookFacadeImpl implements BookFacade {@Overridepublic void addBook() {System.out.println("增加图书方法。。。");}}、BookFacadeProxy.javapackage net.battier.proxy;import java.lang.reflect.InvocationHandler;import java.lang.reflect.Method;import java.lang.reflect.Proxy;/*** JDK动态代理代理类** @author student**/public class BookFacadeProxy implements InvocationHandler {private Object target;/*** 绑定委托对象并返回一个代理类* @param target* @return*/public Object bind(Object target) {this.target = target;//取得代理对象return Proxy.newProxyInstance(target.getClass().getClassLoader(),target.getClass().getInterfaces(), this); //要绑定接口(这是一个缺陷，cglib弥补了这一缺陷)}@Override/*** 调用方法*/public Object invoke(Object proxy, Method method, Object[] args)throws Throwable {Object result=null;System.out.println("事物开始");//执行方法result=method.invoke(target, args);System.out.println("事物结束");return result;}}
3、BookFacadeProxy.java
package net.battier.proxy;import java.lang.reflect.Method;import net.sf.cglib.proxy.Enhancer;import net.sf.cglib.proxy.MethodInterceptor;import net.sf.cglib.proxy.MethodProxy;/*** 使用cglib动态代理** @author student**/public class BookFacadeCglib implements MethodInterceptor {private Object target;/*** 创建代理对象** @param target* @return*/public Object getInstance(Object target) {this.target = target;Enhancer enhancer = new Enhancer();enhancer.setSuperclass(this.target.getClass());// 回调方法enhancer.setCallback(this);// 创建代理对象return enhancer.create();}@Override// 回调方法public Object intercept(Object obj, Method method, Object[] args,MethodProxy proxy) throws Throwable {System.out.println("事物开始");proxy.invokeSuper(obj, args);System.out.println("事物结束");return null;}}
偏执的太偏执、
亦凉
小灰灰
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