struts2学习-简单的拦截器

第一个接口：

package com.struts2.interceptorDemo;

/**

* @author Administrator

*

*/

public interface Dog {

//两个方法的声明

public void info();

public void run();

}

接口的实现类

package com.struts2.interceptorDemo;

/**

* @author Administrator

*

*/

public class DogImpl implements Dog{

public void info() {

System.out.println("INFO");

}

public void run() {

System.out.println("RUN");

}

}

拦截器的定义

package com.struts2.interceptorDemo;

public class DogInterceptor {

//第一个拦截器

public void method1(){

System.out.println("模拟方法1");

}

//第二个拦截器

public void method2(){

System.out.println("模拟方法1");

}

}

代理工厂

package com.struts2.interceptorDemo;

import java.lang.reflect.Proxy;

public class MyProxyFactory {

public static Object getProxy(Object o){



ProxyHandle handle=new ProxyHandle();



handle.setTarget(o);



return Proxy.newProxyInstance(DogImpl.class.getClassLoader(), o.getClass().getInterfaces(), handle);

}

}

handle类

/**

*

*/

package com.struts2.interceptorDemo;

import java.lang.reflect.InvocationHandler;

import java.lang.reflect.Method;

/**

* @author Administrator

*

*/

public class ProxyHandle implements InvocationHandler {

private Object target;

DogInterceptor dogInterceptor=new DogInterceptor();

public Object invoke(Object proxy, Method method, Object[] args)

throws Throwable {

Object result=null;

if(method.getName().equals("INFO")){

dogInterceptor.method1();

result=method.invoke(target, args);

dogInterceptor.method2();

}else{

result=method.invoke(target, args);

}

return result;

}

public void setTarget(Object o) {

this.target = o;

}

}

测试类

/**

*

*/

package com.struts2.interceptorDemo;

/**

* @author Administrator

*

*/

public class TestDog {

/**

* @param args

*/

public static void main(String[] args) {

//创建一个实例

Dog dogProxy=new DogImpl();

Dog dog=null;

Object proxy=MyProxyFactory.getProxy(dogProxy);

if(proxy instanceof Dog){

dog=(Dog)proxy;

}

dog.info();

dog.run();

}

}