Java代理模式
那电脑来做例子
把公共的特有的方法提出来，定义成一个interface
public interface ComputerDAO {
public void usb();//USB接口的个数
public void price();//电脑价格
public void brand();//电脑型号
}
实现类
宏基电脑配置
public class Acer implements ComputerDAO {
public void brand() {
System.out.println("宏基3340");
}
public void price() {
System.out.println("5000");
}
public void usb() {
System.out.println("4个USB接口");
}
}
华硕电脑配置
public class ASUS implements ComputerDAO{
public void brand() {
System.out.println("华硕A42");
}
public void price() {
System.out.println("4500");
}
public void usb() {
System.out.println("3个USB接口");
}
}
代理类
public class ComputerProxy implements ComputerDAO{
private ComputerDAO com;
public ComputerDAO getCom() {
return com;
}
public void setCom(ComputerDAO com) {
this.com = com;
}
public ComputerProxy(){
}
public ComputerProxy(ComputerDAO info){
this.com=info;
}
public void brand() {
System.out.println("在哪里买的");
com.brand();
System.out.println("售后在哪里？");
}
public void price() {
System.out.println("在哪里买的");
com.price();
System.out.println("售后在哪里？");
}
public void usb() {
System.out.println("在哪里买的");
com.usb();
System.out.println("售后在哪里？");
}
}
业务层
public class ComputerService {
private ComputerProxy com;
public ComputerProxy getCom() {
return com;
}
public void setCom(ComputerProxy com) {
this.com = com;
}
public void brand(){
com.brand();
}
public void price(){
com.price();
}
public void usb(){
com.usb();
}
}
Spring配置文件配置
<?xml version="1.0" encoding="UTF-8"?>
<beans
xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:p="http://www.springframework.org/schema/p"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">
<bean id="asus" class="impl.ASUS"></bean>
<bean id="acer" class="impl.Acer"></bean>
<bean id="hp" class="impl.HP"></bean>
<bean id="comproxy" class="proxy.ComputerProxy">
<property name="com" ref="hp"></property>
</bean>
<bean id="service" class="service.ComputerService">
<property name="com" ref="comproxy"></property>
</bean>
</beans>
测试类
public class Test {
public static void main(String[] args) {
ApplicationContext app=new ClassPathXmlApplicationContext("applicationContext.xml");
ComputerService se=(ComputerService)app.getBean("service");
se.brand();
System.out.println("-----------------");
se.price();
System.out.println("-----------------");
se.usb();
}
}