深入探索Java设计模式：责任链模式解析与实践
// 抽象处理者
public abstract class Handler {
protected Handler successor;
public void setSuccessor(Handler successor) {
this.successor = successor;
}
public abstract void handleRequest(Request request);
}
// 具体处理者
public class ConcreteHandler1 extends Handler {
@Override
public void handleRequest(Request request) {
if (request.getType().equals("Type1")) {
System.out.println("ConcreteHandler1 handles the request");
} else if (successor != null) {
successor.handleRequest(request);
}
}
}
public class ConcreteHandler2 extends Handler {
@Override
public void handleRequest(Request request) {
if (request.getType().equals("Type2")) {
System.out.println("ConcreteHandler2 handles the request");
} else if (successor != null) {
successor.handleRequest(request);
}
}
}
// 客户端
public class Client {
public static void main(String[] args) {
Handler handler1 = new ConcreteHandler1();
Handler handler2 = new ConcreteHandler2();
handler1.setSuccessor(handler2);
Request request1 = new Request("Type1");
Request request2 = new Request("Type2");
handler1.handleRequest(request1);
handler1.handleRequest(request2);
}
}