Java设计模式之责任链模式详解

// 处理请求的抽象接口
public interface Handler {
    void handleRequest(Request request);
}
// 具体处理者1
public class ConcreteHandler1 implements Handler {
    private Handler nextHandler;
    public void setNextHandler(Handler nextHandler) {
        this.nextHandler = nextHandler;
    }
    @Override
    public void handleRequest(Request request) {
        // 处理请求的逻辑
        if (shouldHandle(request)) {
            System.out.println("ConcreteHandler1 is handling the request.");
        } else if (nextHandler != null) {
            // 将请求传递给下一个处理者
            nextHandler.handleRequest(request);
        }
    }
    private boolean shouldHandle(Request request) {
        // 判断是否能够处理请求的条件
        // 实际应用中，可以根据业务逻辑进行判断
        return true;
    }
}
// 具体处理者2
public class ConcreteHandler2 implements Handler {
    // 类似ConcreteHandler1的实现，略去不表
}

// 创建责任链
Handler handler1 = new ConcreteHandler1();
Handler handler2 = new ConcreteHandler2();
handler1.setNextHandler(handler2);
// 发起请求
Request request = new Request();
handler1.handleRequest(request);