[Java知识库]通过反射的方式来简化Servlet的分发处理请求

通过反射的方式来简化Servlet的分发处理请求

一个Servlet可以处理多个请求

主要是通过设置请求参数进行分发的使用

话不多说看代码

package com.zhanghan.web;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

/**
 * @author zhanghan
 * @create 2022-02-03 17:17
 */
public abstract class BaseServlet extends HttpServlet {

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doPost(req,resp);
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

        String action = req.getParameter("action");
        System.out.println("我执行了");
//        通过反射调用对应的业务方法
        try {
//
            Method method = this.getClass().getDeclaredMethod(action,HttpServletRequest.class,HttpServletResponse.class);

//            调用目标业务方法
            method.invoke(this,req,resp);
        } catch (NoSuchMethodException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            e.printStackTrace();
        }
//        if("login".equals(action)){
//            System.out.println("处理登录的需求");
//            login(req,resp);
//        }else if("regist".equals(action)){
//            System.out.println("处理注册的需求");
//            regist(req,resp);
//        }

    }
}