?1、DispatcherServlet

package com.csdn.mymvc.core;
import jakarta.servlet.RequestDispatcher;
import jakarta.servlet.ServletException;
import jakarta.servlet.annotation.WebServlet;
import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.Arrays;
@WebServlet("/*")
public class DispatcherServlet extends HttpServlet {
    @Override
    protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        String[] staticResourceSuffixes = {".html", ".jsp", ".jpg", ".png", ".gif", ".css", ".js", ".ico"};
        String uri = req.getRequestURI();
        if (Arrays.stream(staticResourceSuffixes).anyMatch(uri::endsWith)) {
            RequestDispatcher defaultDispatcher = req.getServletContext().getNamedDispatcher("default");
            defaultDispatcher.forward(req,resp);
        }
    }
}

?2、web.xml

文章來(lái)源地址http://www.zghlxwxcb.cn/news/detail-745568.html

The default servlet for all web applications, that serves static  
resources.  It processes all requests that are not mapped to other
servlets with servlet mappings (defined either here or in your own
web.xml file).
默認(rèn)servlet是所有Web應(yīng)用程序的默認(rèn)servlet，用于提供靜態(tài)資源。
它處理所有未映射到其他servlet的請(qǐng)求，
這些servlet映射（在此處或您自己的web.xml文件中定義）。

    <servlet>
        <servlet-name>default</servlet-name>
        <servlet-class>org.apache.catalina.servlets.DefaultServlet</servlet-class>
        <init-param>
            <param-name>debug</param-name>
            <param-value>0</param-value>
        </init-param>
        <init-param>
            <param-name>listings</param-name>
            <param-value>false</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>

2、FruitServlet?

package com.csdn.fruit.servlet;
import com.csdn.fruit.dto.PageInfo;
import com.csdn.fruit.dto.PageQueryParam;
import com.csdn.fruit.dto.Result;
import com.csdn.fruit.pojo.Fruit;
import com.csdn.fruit.service.FruitService;
import com.csdn.fruit.service.impl.FruitServiceImpl;
import com.csdn.fruit.util.RequestUtil;
import com.csdn.fruit.util.ResponseUtil;
import jakarta.servlet.ServletException;
import jakarta.servlet.annotation.WebServlet;
import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import java.io.IOException;
@WebServlet("/fruit/*")
public class FruitServlet extends HttpServlet {
    private FruitService fruitService = new FruitServiceImpl();
    @Override
    protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //     /fruit/index
        String uri = req.getRequestURI();
        uri = uri.substring(1);
        String[] split = uri.split("/");
        String methodName = split[1];
        switch (methodName) {
            case "index" ->index(req,resp);
            case "add"-> add(req, resp);
            case "del"->del(req,resp);
            case "edit"->edit(req,resp);
            case "getFname"-> getFname(req, resp);
            case "update"  -> update(req, resp);
        }
    }

    protected void index(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        Integer pageNo = 1;
        String pageNoStr = req.getParameter("pageNo");
        if (pageNoStr != null && !"".equals(pageNoStr)) {
            pageNo = Integer.parseInt(pageNoStr);
        }

        String keyword = "";
        String keywordStr = req.getParameter("keyword");
        if (keywordStr != null) {
            keyword = keywordStr;
        }
        PageQueryParam pageQueryParam = new PageQueryParam(pageNo, 5, keyword);
        PageInfo<Fruit> pageInfo = fruitService.getFruitPageInfo(pageQueryParam);

        Result result = Result.OK(pageInfo);

        ResponseUtil.print(resp, result);
    }

    protected void add(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        Fruit fruit = (Fruit) RequestUtil.readObject(req, Fruit.class);
        fruitService.addFruit(fruit);
        ResponseUtil.print(resp, Result.OK());
    }

    protected void del(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        Integer fid = Integer.parseInt(req.getParameter("fid"));
        fruitService.delFruit(fid);
        ResponseUtil.print(resp, Result.OK());
    }

    protected void edit(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        Integer fid = Integer.parseInt(req.getParameter("fid"));
        Fruit fruit = fruitService.getFruitById(fid);
        ResponseUtil.print(resp, Result.OK(fruit));
    }

    public void getFname(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        String fname = req.getParameter("fname");
        Fruit fruit = fruitService.getFruitByFname(fname);
        ResponseUtil.print(resp, fruit == null ? Result.OK() : Result.Fail());
    }

    protected void update(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        Fruit fruit = (Fruit) RequestUtil.readObject(req, Fruit.class);
        fruitService.updateFruit(fruit);
        ResponseUtil.print(resp, Result.OK());
    }
}

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