Utilice la arquitectura de tres niveles de MVC para realizar las operaciones de adición, eliminación, modificación y consulta de las tablas de la base de datos (todos los códigos)

Enterprise 2023-05-05 21:11:32 views: null

Utilice la arquitectura de tres niveles de MVC para realizar las operaciones de adición, eliminación, modificación y consulta de las tablas de la base de datos (todos los códigos)

1. Medio ambiente:

1.idea：2021
2.jdk：1.8
3.maven：apache-maven-3.6.1
4.tomcat：tomcat 8.5.4

2. Estructura del proyecto

inserte la descripción de la imagen aquí
inserte la descripción de la imagen aquíinserte la descripción de la imagen aquí

3. Escribir ideas

1. Trabajo preparatorio:
inserte la descripción de la imagen aquí
2. Ideas para agregar, eliminar, modificar y verificar:
inserte la descripción de la imagen aquí
inserte la descripción de la imagen aquí

inserte la descripción de la imagen aquí
inserte la descripción de la imagen aquí
3: Proporcione una idea comprensible
(1) Cree un proyecto/módulo (aplicación web);
(2) Prepare una base de datos db1, que tenga una marca de tabla (como se muestra en la imagen de arriba);
(3) Cree un paquete de arquitectura de tres niveles estructura: mapeador (dao)
servicio de base de datos
web
y paquete de clase de entidad (pojo) y paquete de clase de herramienta (util), y copie el código en él (código fuente a continuación) (
4) Configure el entorno de mybatis (hay una imagen arriba)
(5) Inicie la operación de consulta: hay un hipervínculo "Consultar todo" en la página, y después de hacer clic en él, la tabla consultada se mostrará en el formulario de otra interfaz.¿Cómo escribirlo
?
La idea es la siguiente:
1. Escriba el método de consulta en BrandMapper, usando anotaciones,
2. Implemente este método en BrandService,
3. Use el servicio para llamar al método de consulta en SelectAllServlet y vaya a la interfaz después de la consulta (incluidas varias páginas jsp datos La recepción)
otra lógica es un poco más complicada que eso, ¡no está mal!
(6) Partes que necesitan atención:
1. Manejo de caracteres ilegibles,
2. Estructura de nombres inconsistente,
3. A excepción de las consultas, se deben enviar otras transacciones,
(7) Efecto: (póngalo al final)
(8) Si no lo entiendes: contáctame! ! !

Cuatro Código

Mapeador de marca

package com.itheima.mapper;

import com.itheima.pojo.Brand;
import org.apache.ibatis.annotations.*;

import java.util.List;

public interface BrandMapper {
    
    
    /**
     * 查询所有
     * @return
     */
    @Select("select * from tb_brand")
    @ResultMap("brandResultMap")//解决不同名问题
    List<Brand> selectAll();

    /**
     * 插入
     * @param brand
     */
    @Insert("insert into tb_brand values(null,#{brandName},#{companyName},#{ordered},#{description},#{status})")
    void add( Brand brand);

    /**
     * 根据id查
     * @param id
     * @return
     */
    @Select("select * from tb_brand where id=#{id}")
    @ResultMap("brandResultMap")//解决不同名问题
    Brand selectById(int id);

    /**
     * 修改
     * @param brand
     */
    @Update("update tb_brand set brand_name = #{brandName},company_name = #{companyName},ordered = #{ordered},description = #{description},status = #{status} where id = #{id}")
    void update(Brand brand);

    /**
     * 根据id删除
     */
    @Delete("delete from tb_brand where id=#{id}")
    void  deleteById(int id);
}

**Marca **

package com.itheima.pojo;
/**
 * 品牌实体类
 */
public class Brand {
    
    
    // id 主键
    private Integer id;
    // 品牌名称
    private String brandName;
    // 企业名称
    private String companyName;
    // 排序字段
    private Integer ordered;
    // 描述信息
    private String description;
    // 状态：0：禁用  1：启用
    private Integer status;


    public Brand() {
    
    
    }

    public Brand(Integer id, String brandName, String companyName, String description) {
    
    
        this.id = id;
        this.brandName = brandName;
        this.companyName = companyName;
        this.description = description;
    }

    public Brand(Integer id, String brandName, String companyName, Integer ordered, String description, Integer status) {
    
    
        this.id = id;
        this.brandName = brandName;
        this.companyName = companyName;
        this.ordered = ordered;
        this.description = description;
        this.status = status;
    }

    public Integer getId() {
    
    
        return id;
    }

    public void setId(Integer id) {
    
    
        this.id = id;
    }

    public String getBrandName() {
    
    
        return brandName;
    }

    public void setBrandName(String brandName) {
    
    
        this.brandName = brandName;
    }

    public String getCompanyName() {
    
    
        return companyName;
    }

    public void setCompanyName(String companyName) {
    
    
        this.companyName = companyName;
    }

    public Integer getOrdered() {
    
    
        return ordered;
    }

    public void setOrdered(Integer ordered) {
    
    
        this.ordered = ordered;
    }

    public String getDescription() {
    
    
        return description;
    }

    public void setDescription(String description) {
    
    
        this.description = description;
    }

    public Integer getStatus() {
    
    
        return status;
    }

    public void setStatus(Integer status) {
    
    
        this.status = status;
    }

    @Override
    public String toString() {
    
    
        return "Brand{" +
                "id=" + id +
                ", brandName='" + brandName + '\'' +
                ", companyName='" + companyName + '\'' +
                ", ordered=" + ordered +
                ", description='" + description + '\'' +
                ", status=" + status +
                '}';
    }
}

**MarcaServicio**

package com.itheima.service;

import com.itheima.mapper.BrandMapper;
import com.itheima.pojo.Brand;
import com.itheima.util.SqlSessionFactoryUtils;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;

import java.util.List;

public class BrandService {
    
    
    SqlSessionFactory factory= SqlSessionFactoryUtils.getSqlSessionFactory();

    /**
     * 查询所有
     * @return
     */
    public List<Brand> selectAll(){
    
    
        //调用BrandMapper的selectAll()

        //2.获取 sqlSession对象
        SqlSession sqlSession=factory.openSession();
        //3.获取BrandMapper
        BrandMapper mapper = sqlSession.getMapper(BrandMapper.class);
        //4.调用方法
        List<Brand> brands = mapper.selectAll();

        sqlSession.close();

        return brands;

    }

    /**
     * 新增
     * @param brand
     */
    public void add(Brand brand){
    
    
        SqlSession sqlSession = factory.openSession();

        BrandMapper mapper=sqlSession.getMapper(BrandMapper.class);

        mapper.add(brand);
        sqlSession.commit();

        sqlSession.close();

    }

    /**
     * 根据id查
     * @param id
     * @return
     */
    public Brand selectById(int id){
    
    
        SqlSession sqlSession = factory.openSession();
        BrandMapper mapper = sqlSession.getMapper(BrandMapper.class);
        Brand brand = mapper.selectById(id);
        sqlSession.close();
        return brand;
    }

    /**
     * 修改
     * @param brand
     */
    public void update(Brand brand){
    
    
        SqlSession sqlSession = factory.openSession();
        BrandMapper mapper = sqlSession.getMapper(BrandMapper.class);
        mapper.update(brand);
        sqlSession.commit();
        sqlSession.close();
    }

    public void deleteById(int id){
    
    
        SqlSession sqlSession = factory.openSession();
        BrandMapper mapper = sqlSession.getMapper(BrandMapper.class);
        mapper.deleteById(id);
        sqlSession.commit();
        sqlSession.close();
    }
}

**SqlSessionFactoryUtils**

package com.itheima.util;

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

import java.io.IOException;
import java.io.InputStream;

public class SqlSessionFactoryUtils {
    
    

    private static SqlSessionFactory sqlSessionFactory;

    static {
    
    
        //静态代码块会随着类的加载而自动执行，且只执行一次

        try {
    
    
            String resource = "mybatis-config.xml";
            InputStream inputStream = Resources.getResourceAsStream(resource);
            sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
        } catch (IOException e) {
    
    
            e.printStackTrace();
        }
    }


    public static SqlSessionFactory getSqlSessionFactory(){
    
    
        return sqlSessionFactory;
    }
}

**AñadirServlet**

package com.itheima.web;

import com.itheima.pojo.Brand;
import com.itheima.service.BrandService;

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

@WebServlet("/addServlet")
public class AddServlet extends HttpServlet {
    
    
    private BrandService service=new BrandService();
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    
    
        //处理post请求乱码问题
        request.setCharacterEncoding("utf-8");

        //1.接收表单提交的数据
        String brandName = request.getParameter("brandName");
        String companyName = request.getParameter("companyName");
        String ordered = request.getParameter("ordered");
        String description = request.getParameter("description");
        String status = request.getParameter("status");

        Brand brand=new Brand();
        brand.setBrandName(brandName);
        brand.setCompanyName(companyName);
        brand.setOrdered(Integer.parseInt(ordered));
        brand.setDescription(description);
        brand.setStatus(Integer.parseInt(status));
        //2.调用service完成添加
        service.add(brand);

        //3.转发到查询所有的servlet
        request.getRequestDispatcher("/selectAllServlet").forward(request,response);


    }

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    
    
        this.doGet(request, response);
    }
}

**Eliminar por IdServlet **

package com.itheima.web;

import com.itheima.pojo.Brand;
import com.itheima.service.BrandService;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.List;

@WebServlet("/deleteByIdServlet")
public class DeleteByIdServlet extends HttpServlet {
    
    
    private BrandService service=new BrandService();
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    
    
        //1.接收数据id
        String id = request.getParameter("id");
        //2.调用service方法
        service.deleteById(Integer.parseInt(id));

        List<Brand> brands = service.selectAll();

        request.setAttribute("brands",brands);
        request.getRequestDispatcher("/brand.jsp").forward(request,response);


    }

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    
    
        this.doGet(request, response);
    }
}

**SeleccionarTodoServlet**

package com.itheima.web;

import com.itheima.pojo.Brand;
import com.itheima.service.BrandService;

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

@WebServlet("/selectAllServlet")
public class SelectAllServlet extends HttpServlet {
    
    
    BrandService service = new BrandService();
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    
    
        //1.调用BrandService完成查询

        List<Brand> brands = service.selectAll();

        //2.存入request中
        request.setAttribute("brands",brands);

        //3.转发到brands.jsp
        request.getRequestDispatcher("/brand.jsp").forward(request,response);

    }

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    
    
        this.doGet(request, response);
    }
}

**SelectByIdServlet**

package com.itheima.web;

import com.itheima.pojo.Brand;
import com.itheima.service.BrandService;

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

@WebServlet("/selectByIdServlet")
public class SelectByIdServlet extends HttpServlet {
    
    
    private BrandService service=new BrandService();
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    
    
        //1.接收数据id
        String id = request.getParameter("id");
        //2.调用service方法查询
        Brand brand = service.selectById(Integer.parseInt(id));
        //3.存到request域里
        request.setAttribute("brand",brand);
        //转发到一个表单update,jsp
        request.getRequestDispatcher("/brand.jsp").forward(request,response);
    }

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    
    
        this.doGet(request, response);
    }
}

**ActualizarServlet**

package com.itheima.web;

import com.itheima.pojo.Brand;
import com.itheima.service.BrandService;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebServlet("/updateServlet")
public class UpdateServlet extends HttpServlet {
    
    
    private BrandService service=new BrandService();
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    
    
        //处理post请求乱码问题
        request.setCharacterEncoding("utf-8");

        //1.接收表单提交的数据
        String id=request.getParameter("id");
        String brandName = request.getParameter("brandName");
        String companyName = request.getParameter("companyName");
        String ordered = request.getParameter("ordered");
        String description = request.getParameter("description");
        String status = request.getParameter("status");

        Brand brand=new Brand();
        brand.setId(Integer.parseInt(id));
        brand.setBrandName(brandName);
        brand.setCompanyName(companyName);
        brand.setOrdered(Integer.parseInt(ordered));
        brand.setDescription(description);
        brand.setStatus(Integer.parseInt(status));
        //2.调用service完成修改
        service.update(brand);

        //3.转发到查询所有的servlet
       request.getRequestDispatcher("/selectAllServlet").forward(request,response);
    }

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    
    
        this.doGet(request, response);
    }
}

BrandMapper.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.itheima.mapper.BrandMapper">


<!--解决属性名和数据库名字不一样查不出来的问题-->
    <resultMap id="brandResultMap" type="brand">
        <result column="brand_name" property="brandName"></result>
        <result column="company_name" property="companyName"></result>
    </resultMap>
</mapper>

mybatis-config.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <!--起别名-->
    <typeAliases>
        <package name="com.itheima.pojo"/>
    </typeAliases>

    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC"/>
            <dataSource type="POOLED">
                <property name="driver" value="com.mysql.jdbc.Driver"/>
                <property name="url" value="jdbc:mysql:///db1?useSSL=false&amp;useServerPrepStmts=true"/>
                <property name="username" value="root"/>
                <property name="password" value="1234"/>
            </dataSource>
        </environment>
    </environments>
    <mappers>
        <!--扫描mapper-->
        <package name="com.itheima.mapper"/>
    </mappers>
</configuration>

agregarMarca.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <title>添加品牌</title>
</head>
<body>
<h3>添加品牌</h3>
<form action="/brand-demo1/addServlet" method="post">
    品牌名称：<input name="brandName"><br>
    企业名称：<input name="companyName"><br>
    排序：<input name="ordered"><br>
    描述信息：<textarea rows="5" cols="20" name="description"></textarea><br>
    状态：
    <input type="radio" name="status" value="0">禁用
    <input type="radio" name="status" value="1">启用<br>

    <input type="submit" value="提交">
</form>
</body>
</html>

marca.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<input type="button" value="新增" id="add"><br>
<hr>
<table border="1" cellspacing="0" width="80%">
    <tr>
        <th>序号</th>
        <th>品牌名称</th>
        <th>企业名称</th>
        <th>排序</th>
        <th>品牌介绍</th>
        <th>状态</th>
        <th>操作</th>

    </tr>


    <c:forEach items="${brands}" var="brand" varStatus="status">
        <tr align="center">
            <%--<td>${
    
    brand.id}</td>--%>
            <td>${
    
    status.count}</td>
            <td>${
    
    brand.brandName}</td>
            <td>${
    
    brand.companyName}</td>
            <td>${
    
    brand.ordered}</td>
            <td>${
    
    brand.description}</td>
            <c:if test="${brand.status == 1}">
                <td>启用</td>
            </c:if>
            <c:if test="${brand.status != 1}">
                <td>禁用</td>
            </c:if>

            <td><a href="/brand-demo1/selectByIdServlet?id=${brand.id}">修改</a> <a href="/brand-demo1/deleteByIdServlet?id=${brand.id}">删除</a></td>
        </tr>

    </c:forEach>

</table>

<script>
    document.getElementById("add").onclick=function (){
    
    
        location.href="/brand-demo1/addBrand.jsp";
    }
</script>
</body>
</html>

actualizar.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <title>修改品牌</title>
</head>
<body>
<h3>修改品牌</h3>
<form action="/brand-demo1/updateServlet" method="post">

    <%--隐藏域，提交id--%>
    <input type="hidden" name="id" value="${brand.id}">

    品牌名称：<input name="brandName" value="${brand.brandName}"><br>
    企业名称：<input name="companyName" value="${brand.companyName}"><br>
    排序：<input name="ordered" value="${brand.ordered}"><br>
    描述信息：<textarea rows="5" cols="20" name="description">${
    
    brand.description} </textarea><br>
    状态：
    <c:if test="${brand.status == 0}">

        <input type="radio" name="status" value="0" checked>禁用
        <input type="radio" name="status" value="1">启用<br>
    </c:if>

    <c:if test="${brand.status == 1}">

        <input type="radio" name="status" value="0" >禁用
        <input type="radio" name="status" value="1" checked>启用<br>
    </c:if>
    <input type="submit" value="提交">
</form>
</body>
</html>

pom.xml

<?xml version="1.0" encoding="UTF-8"?>

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <groupId>org.example</groupId>
  <artifactId>brand-demo1</artifactId>
  <version>1.0-SNAPSHOT</version>
  <packaging>war</packaging>

  <name>brand-demo1 Maven Webapp</name>
  <!-- FIXME change it to the project's website -->
  <url>http://www.example.com</url>

  <properties>
    <maven.compiler.source>8</maven.compiler.source>
    <maven.compiler.target>8</maven.compiler.target>
  </properties>
  <dependencies>
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>3.5.5</version>
    </dependency>
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>5.1.34</version>
    </dependency>
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>javax.servlet-api</artifactId>
      <version>3.1.0</version>
      <scope>provided</scope>
    </dependency>
    <dependency>
      <groupId>javax.servlet.jsp</groupId>
      <artifactId>jsp-api</artifactId>
      <version>2.2</version>
      <scope>provided</scope>
    </dependency>
    <dependency>
      <groupId>jstl</groupId>
      <artifactId>jstl</artifactId>
      <version>1.2</version>
    </dependency>
    <dependency>
      <groupId>taglibs</groupId>
      <artifactId>standard</artifactId>
      <version>1.1.2</version>
    </dependency>

  </dependencies>
  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.tomcat.maven</groupId>
        <artifactId>tomcat7-maven-plugin</artifactId>
        <version>2.2</version>
      </plugin>
    </plugins>
  </build>

</project>

Efecto:

inserte la descripción de la imagen aquí
Haga clic en Consultar todo ------>
inserte la descripción de la imagen aquí
Haga clic en Modificar----->
inserte la descripción de la imagen aquí
Enviar después de la modificación----->
inserte la descripción de la imagen aquí
Haga clic en el botón Agregar en la esquina superior izquierda ----->
inserte la descripción de la imagen aquí
Haga clic en Enviar------ >
inserte la descripción de la imagen aquí
Haga clic en Eliminar ------->
inserte la descripción de la imagen aquí

Supongo que te gusta

Origin blog.csdn.net/qq_46026355/article/details/127634604
Recomendado
Clasificación
Diario
Más
2024-05-17(4)
2024-05-16(22)
2024-05-15(5)
2024-05-14(10)
2024-05-13(7)
2024-05-12(22)
2024-05-11(31)
2024-05-10(32)
2024-05-09(31)
2024-05-08(18)

Code World

© 2018 codetd.com