1、@Controller

package com.csdn.mymvc.annotation;
import java.lang.annotation.*;
@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
@Inherited
public @interface Controller {
}

2、@Service

package com.csdn.mymvc.annotation;
import java.lang.annotation.*;
@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
@Inherited
public @interface Service {
}

3、@Repository

package com.csdn.mymvc.annotation;
import java.lang.annotation.*;
@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
@Inherited
public @interface Repository {
}

4、@Autowire

package com.csdn.mymvc.annotation;
import java.lang.annotation.*;
@Target(ElementType.FIELD)
@Retention(RetentionPolicy.RUNTIME)
@Inherited
public @interface Autowire {
}

 1、FruitController

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.util.RequestUtil;
import com.csdn.fruit.util.ResponseUtil;
import com.csdn.mymvc.annotation.*;
import jakarta.servlet.ServletException;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import java.io.IOException;
@Controller
@RequestMapping("/fruit")
public class FruitController {
    @Autowire
    private FruitService fruitService;

    @GetMapping("/index")
    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);
    }

    @PostMapping("/add")
    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());
    }

    @GetMapping("/del")
    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());
    }

    @GetMapping("/edit")
    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));
    }

    @GetMapping("/getFname")
    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());
    }

    @PostMapping("/update")
    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());
    }
}

2、FruitServiceImpl

package com.csdn.fruit.service.impl;
import com.csdn.fruit.dao.FruitDao;
import com.csdn.fruit.dto.PageInfo;
import com.csdn.fruit.dto.PageQueryParam;
import com.csdn.fruit.pojo.Fruit;
import com.csdn.fruit.service.FruitService;
import com.csdn.mymvc.annotation.Autowire;
import com.csdn.mymvc.annotation.Service;
import java.util.List;
@Service
public class FruitServiceImpl implements FruitService {

    @Autowire
    private FruitDao fruitDao ;

    @Override
    public PageInfo<Fruit> getFruitPageInfo(PageQueryParam pageQueryParam) {
        Integer pageNo = pageQueryParam.getPageNo();
        Integer pageSize = pageQueryParam.getPageSize();
        String keyword = pageQueryParam.getKeyword();
        List<Fruit> fruitList = fruitDao.getFruitList(pageNo, pageSize, keyword);
        Integer recordCount = fruitDao.getRecordCount(pageQueryParam.getKeyword());
        PageInfo<Fruit> fruitPageInfo = new PageInfo<>(fruitList, pageNo, recordCount);
        return fruitPageInfo;
    }

    @Override
    public void addFruit(Fruit fruit) {
        if (fruitDao.getFruitByFname(fruit.getFname()) == null) {
            fruitDao.addFruit(fruit);
        }
    }

    @Override
    public void updateFruit(Fruit fruit) {
            fruitDao.updateFruit(fruit);
    }

    @Override
    public void delFruit(Integer fid) {
            fruitDao.delFruitByFid(fid);
    }

    @Override
    public Fruit getFruitById(Integer fid) {
        return fruitDao.getFruitByFid(fid);
    }

    @Override
    public Fruit getFruitByFname(String fname) {
        return fruitDao.getFruitByFname(fname);
    }
}

3、FruitDaoImpl

package com.csdn.fruit.dao.impl;
import com.csdn.fruit.dao.FruitDao;
import com.csdn.fruit.pojo.Fruit;
import com.csdn.mymvc.annotation.Repository;
import com.csdn.mymvc.dao.BaseDao;
import java.util.List;
@Repository
public class FruitDaoImpl extends BaseDao<Fruit> implements FruitDao {
    @Override
    public void addFruit(Fruit fruit) {
        String sql = "insert into t_fruit values (0,?,?,?,?)";
        super.executeUpdate(sql, fruit.getFname(), fruit.getPrice(), fruit.getFcount(), fruit.getRemark());
    }

    @Override
    public void delFruit(String fname) {
        String sql = "delete from t_fruit where fname=?";
        super.executeUpdate(sql, fname);
    }

    //通过 fid 删除水果库存记录
    @Override
    public void delFruitByFid(Integer fid) {
        super.executeUpdate("delete from t_fruit where fid = ? ", fid);
    }

    //通过 fid 可以修改所有的属性值
    @Override
    public void updateFruit(Fruit fruit) {
        String sql = "update  t_fruit set fname=?,price=?,fcount=?,remark=? where fid = ?";
        super.executeUpdate(sql, fruit.getFname(), fruit.getPrice(), fruit.getFcount(), fruit.getRemark(), fruit.getFid());
    }

    @Override
    public List<Fruit> getFruitList() {
        return super.executeQuery("select * from t_fruit");
    }

    @Override
    public List<Fruit> getFruitList(Integer pageNo, Integer pageSize) {
        return super.executeQuery("select * from t_fruit limit ?,?", (pageNo - 1) * pageSize, pageSize);
    }

    @Override
    public List<Fruit> getFruitList(Integer pageNo, Integer pageSize, String keyword) {
        return super.executeQuery("select * from t_fruit where fname like ? or remark like?  limit ?,?", "%" + keyword + "%", "%" + keyword + "%", (pageNo - 1) * pageSize, pageSize);
    }

    @Override
    public Fruit getFruitByFname(String fname) {
        return load("select * from t_fruit where fname = ?", fname);
    }

    @Override
    public Fruit getFruitByFid(Integer fid) {
        return load("select * from t_fruit where fid=?", fid);
    }

    @Override
    public Integer getRecordCount() {
        String sql = "select count(*) from t_fruit";
        return ((Long) executeComplexQuery(sql).get(0)[0]).intValue();
    }

    @Override
    public Integer getRecordCount(String keyword) {
        String sql = "select count(*) from t_fruit where fname like ? or remark like ? ";
        return ((Long) executeComplexQuery(sql, "%" + keyword + "%", "%" + keyword + "%").get(0)[0]).intValue();
    }
}