写某马旅游网抽取BaseServlet遇到的问题

980041382 发表于 2021-10-16 18:18

本帖最后由 980041382 于 2021-10-16 18:28 编辑

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
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
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 发表于 2021-10-16 21:39

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

980041382 发表于 2021-10-17 00:34

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 发表于 2021-10-17 08:14

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 发表于 2021-10-17 14:50

hujachin 发表于 2021-10-17 08:14
什么意思
这个计算下一页

页: [1]

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写某马旅游网抽取BaseServlet遇到的问题