写某马旅游网抽取BaseServlet遇到的问题

980041382

java.lang.NoSuchMethodException: cn.itcast.travel.web.servlet.UserServlet.add(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletRequest)
        at java.lang.Class.getDeclaredMethod(Class.java:2158)
        at cn.itcast.travel.web.servlet.BaseServlet.service(BaseServlet.java:28)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)

这是BaseServlet

[Java] 纯文本查看 复制代码

package cn.itcast.travel.web.servlet;

import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.annotation.*;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;


public class BaseServlet extends HttpServlet {
    @Override
    protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //System.out.println("baseServlet的service方法被执行了...");

        //完成方法分发
        //1.获取请求路径
        String uri = req.getRequestURI();  //  返回/travel/user/add
        System.out.println("请求uri："+uri);  // /user/add
        //2.获取方法名称
        String methodName = uri.substring(uri.lastIndexOf('/') + 1);
        System.out.println("方法名称："+methodName);
        //3.获取方法对象Method
        //this 谁调用我？我代表谁
        System.out.println(this);//UserServlet的对象cn.itcast.travel.web.servlet.UserServlet@16dc326f
        try {
            //忽略访问权限修饰符，获取方法
            Method method = this.getClass().getDeclaredMethod(methodName, HttpServletRequest.class, HttpServletRequest.class);
            //4.执行方法
            //暴力反射
            //method.setAccessible(true);
            method.invoke(this,req,resp);
        } catch (NoSuchMethodException | IllegalAccessException | InvocationTargetException e) {
            e.printStackTrace();
        }
    }
}

这是UserServlet

[Java] 纯文本查看 复制代码

package cn.itcast.travel.web.servlet;

import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.annotation.*;
import java.io.IOException;

@WebServlet("/user/*")
public class UserServlet extends BaseServlet {

    public void add(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        System.out.println("userServlet的add方法");
    }

    public void find(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        System.out.println("userServlet的find方法");
    }
}

无论是使用getDeclaredMethod（）还是getMethod（）都会报这个错误，把Protected设置成Public也还是会报错



求助！


是自己太粗心了。。。

hujachin

Method method = this.getClass().getMethod(methodName, HttpServletRequest.class, HttpServletResponse.class);

980041382

hujachin 发表于 2021-10-16 21:39
Method method = this.getClass().getMethod(methodName, HttpServletRequest.class, HttpServletResponse. ...

对 我就是粗心了
大佬写过这个黑马旅游网吗
它那个跳转到最后一页是怎么写的你知道嘛！

hujachin

980041382 发表于 2021-10-17 00:34
对 我就是粗心了
大佬写过这个黑马旅游网吗
它那个跳转到最后一页是怎么写的你知道嘛！

什么意思

980041382

hujachin 发表于 2021-10-17 08:14
什么意思

这个  计算下一页