I tried to find the source code of static proxy in JDK, Android SDK and some well-known libraries, but couldn't find it. If any readers find it, please comment or send me a private message.
Contents of this article
Example of static proxy
1. Ticketing agent
Ticketing service
public interface TicketService {
//售票
public void sellTicket();
//问询
public void inquire();
//退票
public void withdraw();
}
Site ticket sales
public class Station implements TicketService {
@Override
public void sellTicket() {
System.out.println("\n\t售票.....\n");
}
@Override
public void inquire() {
System.out.println("\n\t问询。。。。\n");
}
@Override
public void withdraw() {
System.out.println("\n\t退票......\n");
}
}
Agent outlet ticket sales
public class StationProxy implements TicketService {
private Station station;
public StationProxy(Station station){
this.station = station;
}
@Override
public void sellTicket() {
// 1.做真正业务前，提示信息
this.showAlertInfo("××××您正在使用车票代售点进行购票，每张票将会收取5元手续费！××××");
// 2.调用真实业务逻辑
station.sellTicket();
// 3.后处理
this.takeHandlingFee();
this.showAlertInfo("××××欢迎您的光临，再见！××××\n");
}
@Override
public void inquire() {
// 1.做真正业务前，提示信息
this.showAlertInfo("××××欢迎光临本代售点，问询服务不会收取任何费用，本问询信息仅供参考，具体信息以车站真实数据为准！××××");
// 2.调用真实逻辑
station.inquire();
// 3。后处理
this.showAlertInfo("××××欢迎您的光临，再见！××××\n");
}
@Override
public void withdraw() {
// 1.真正业务前处理
this.showAlertInfo("××××欢迎光临本代售点，退票除了扣除票额的20%外，本代理处额外加收2元手续费！××××");
// 2.调用真正业务逻辑
station.withdraw();
// 3.后处理
this.takeHandlingFee();
}
/*
* 展示额外信息
*/
private void showAlertInfo(String info) {
System.out.println(info);
}
/*
* 收取手续费
*/
private void takeHandlingFee() {
System.out.println("收取手续费，打印发票。。。。。\n");
}
}
2. Star agent
public interface IStar {
public abstract void sing(double money);
}
public class StarImpl implements IStar {
public void sing(double money) {
System.out.println("唱歌，收入" + money + "元");
}
}
//经纪人
public class StarProxy implements IStar {
private StarImpl star = new StarImpl();
public void sing(double money) {
System.out.println("请先预约时间");
System.out.println("沟通出场费用");
if (money < 100000) {
System.out.println("对不起，出场费10w万以内不受理");
return;
}
System.out.println("经纪人抽取了" + money * 0.2 + "元代理费用");
star.sing(money * 0.8);
}
}
//测试
public class ProxyDemo {
public static void main(String[] args) {
StarProxy sg = new StarProxy();
sg.sing(200000);
}
}