[Java知识库] MyBatis快速入门——第五章、maven整合Mybatis&Servlet

开发: C++知识库 Java知识库 JavaScript Python PHP知识库人工智能区块链大数据移动开发嵌入式开发工具数据结构与算法开发测试游戏开发网络协议系统运维
教程: HTML教程 CSS教程 JavaScript教程 Go语言教程 JQuery教程 VUE教程 VUE3教程 Bootstrap教程 SQL数据库教程 C语言教程 C++教程 Java教程 Python教程 Python3教程 C#教程
数码: 电脑笔记本显卡显示器固态硬盘硬盘耳机手机 iphone vivo oppo 小米华为单反装机图拉丁

-> Java知识库 -> MyBatis快速入门——第五章、maven整合Mybatis&Servlet_tomcat -> 正文阅读

[Java知识库]MyBatis快速入门——第五章、maven整合Mybatis&Servlet_tomcat

MyBatis快速入门——第五章、maven整合Mybatis&Servlet_tomcat

创建maven项目并引入mybatis、tomcat、servlet、

MyBatis快速入门——第五章、maven整合Mybatis&Servlet_tomcat

创建maven项目并引入mybatis、tomcat、servlet、

1、创建maven病引入mybatis的包

3、配置tomcat

4、引入servlet包

5、配置mybatis-config.xml

6、配置ProductMapper.xml文件 7、创建【com.item.model.Product.java】文件

8、创建【com.item.mapper.ProductMapper.java】文件

9、创建【com.item.common】下的【JDBC】常用工具类

10、创建【com.item.dao】下的【ProductDAO.java】文件

11、完成【servlet】访问层的【GetInfoServlet.java】接口文件

可以添加【UpdateByIdServlet】接口

12、编辑视图文件【GetInfo.jsp】

查询效果:?

1、创建maven病引入mybatis的包

2、引入【mybaits】【log4j】【mysql】的【maven】包

<dependency>
  <groupId>org.mybatis</groupId>
  <artifactId>mybatis</artifactId>
  <version>3.5.1</version>
</dependency>
<dependency>
  <groupId>org.slf4j</groupId>
  <artifactId>slf4j-log4j12</artifactId>
  <version>1.7.10</version>
</dependency>
<dependency>
  <groupId>mysql</groupId>
  <artifactId>mysql-connector-java</artifactId>
  <version>5.1.6</version>
</dependency>

如果不刷新maven则会报错。

加载完成

当前包数量【5】，缺少【servlet】的包?

3、配置tomcat

?如果端口号8080有冲突自行更换即可。

4、引入servlet包

添加点测试代码，执行【tomcat】测试一下

创建【com.item.servlet】包，并创建【GetInfoServlet】文件。

package com.item.servlet;

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("/GetInfo")
public class GetInfoServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        System.out.println("访问测试");
    }

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

访问接口：

为了操作方便，将默认浏览器改为谷歌。

5、配置mybatis-config.xml

基础配置，这里用到的表是【product】表，sql语句看下方。

<?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>
    <settings>
        <setting name="logImpl" value="LOG4J"/>
    </settings>
    <typeAliases>
        <package name="com.item.model"/>
    </typeAliases>
    <environments default="dev">
        <environment id="dev">
            <transactionManager type="JDBC"></transactionManager>
            <dataSource type="POOLED">
                <property name="driver" value="com.mysql.jdbc.Driver"/>
                <property name="url" value="jdbc:mysql://localhost:3306/mytest?characterEncoding=utf-8"/>
                <property name="username" value="root"/>
                <property name="password" value="12345678"/>
            </dataSource>
        </environment>
    </environments>
    <mappers>
        <mapper resource="com/item/mapper/ProductMapper.xml"></mapper>
    </mappers>
</configuration>

配置ProductMapper.xml文件

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC ".//mybaits.org/DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.item.mapper.ProductMapper">
    <select id="GetInfo" resultType="Product">
        select * from product
    </select>
    <delete id="DeleteById" parameterType="java.lang.Integer">
        delete from product where id="${id}"
    </delete>
</mapper>

数据库名称【mytest】，编码类型【utf8】

DROP TABLE IF EXISTS `product`;
CREATE TABLE `product`  (
  `id` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL,
  `createDate` datetime(0) NOT NULL,
  `modifyDate` datetime(0) NOT NULL,
  `productName` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL,
  `productTitle` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL,
  `productPrice` decimal(10, 2) NOT NULL,
  `productCount` int(8) NOT NULL,
  `productType` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL,
  `productColor` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  `productWeight` double NULL DEFAULT NULL,
  `productStatus` int(1) NOT NULL,
  PRIMARY KEY (`id`) USING BTREE
) ENGINE = InnoDB CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Compact;
 
INSERT INTO `product` VALUES ('b383581fd20211ec84b500e070bfdb54', '2022-05-12 22:49:18', '2022-05-12 22:49:18', '外星人M15', '高端外星人', 13499.00, 299, '外星人', 'black', 3300, 1);
INSERT INTO `product` VALUES ('b3839547d20211ec84b500e070bfdb54', '2022-05-12 22:49:18', '2022-05-12 22:49:18', 'ThinkBook', '联想', 4599.00, 159, '联想', 'gray', 2250, 1);
INSERT INTO `product` VALUES ('b383d49dd20211ec84b500e070bfdb54', '2022-05-12 22:49:18', '2022-05-12 22:49:18', '戴尔G15', '戴尔', 7499.00, 179, '戴尔', 'gray', 2270, 1);
INSERT INTO `product` VALUES ('b384180cd20211ec84b500e070bfdb54', '2022-05-12 22:49:18', '2022-05-12 22:49:18', 'RedmiBook Pro15', '小米', 4499.00, 699, '小米', 'black', 2500, 1);
INSERT INTO `product` VALUES ('b38457bed20211ec84b500e070bfdb54', '2022-05-12 22:49:18', '2022-05-12 22:49:18', '华硕a豆', '华硕', 3699.00, 799, '华硕', 'pink', 2100, 1);
INSERT INTO `product` VALUES ('f6715eb2d20111ec84b500e070bfdb54', '2022-05-12 22:44:01', '2022-05-12 22:44:01', '拯救者Y7700P', '2022新品拯救者', 7399.00, 199, '联想', 'gray', 2200, 1);

6、配置ProductMapper.xml文件 7、创建【com.item.model.Product.java】文件

写入一下编码，【Getter】【Setter】【toString()】

package com.item.model;

import java.math.BigDecimal;
import java.util.Date;

public class Product {
    private String id;
    private Date createDate;
    private Date modifyDate;
    private String productName;
    private String productTitle;
    private BigDecimal productPrice;
    private int productCount;
    private String productType;
    private String productColor;
    private double productWeight;
    private int productStatus;

    @Override
    public String toString() {
        return "Product{" +
                "id='" + id + '\'' +
                ", createDate=" + createDate +
                ", modifyDate=" + modifyDate +
                ", productName='" + productName + '\'' +
                ", productTitle='" + productTitle + '\'' +
                ", productPrice=" + productPrice +
                ", productCount=" + productCount +
                ", productType='" + productType + '\'' +
                ", productColor='" + productColor + '\'' +
                ", productWeight=" + productWeight +
                ", productStatus=" + productStatus +
                '}';
    }

    public String getId() {
        return id;
    }

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

    public Date getCreateDate() {
        return createDate;
    }

    public void setCreateDate(Date createDate) {
        this.createDate = createDate;
    }

    public Date getModifyDate() {
        return modifyDate;
    }

    public void setModifyDate(Date modifyDate) {
        this.modifyDate = modifyDate;
    }

    public String getProductName() {
        return productName;
    }

    public void setProductName(String productName) {
        this.productName = productName;
    }

    public String getProductTitle() {
        return productTitle;
    }

    public void setProductTitle(String productTitle) {
        this.productTitle = productTitle;
    }

    public BigDecimal getProductPrice() {
        return productPrice;
    }

    public void setProductPrice(BigDecimal productPrice) {
        this.productPrice = productPrice;
    }

    public int getProductCount() {
        return productCount;
    }

    public void setProductCount(int productCount) {
        this.productCount = productCount;
    }

    public String getProductType() {
        return productType;
    }

    public void setProductType(String productType) {
        this.productType = productType;
    }

    public String getProductColor() {
        return productColor;
    }

    public void setProductColor(String productColor) {
        this.productColor = productColor;
    }

    public double getProductWeight() {
        return productWeight;
    }

    public void setProductWeight(double productWeight) {
        this.productWeight = productWeight;
    }

    public int getProductStatus() {
        return productStatus;
    }

    public void setProductStatus(int productStatus) {
        this.productStatus = productStatus;
    }
}

8、创建【com.item.mapper.ProductMapper.java】文件

这里用的是【interface】来修饰类

package com.item.mapper;

import com.item.model.Product;
import org.apache.ibatis.annotations.Param;

import java.util.List;

public interface ProductMapper {
    /**
     * 查询所有的接口
     * @return
     */
    List<Product> GetInfo();

    /**
     * 删除
     * @param id
     * @return
     */
    int DeleteById(@Param("id") String id);
}

9、创建【com.item.common】下的【JDBC】常用工具类

编码如下：

package com.item.common;

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.Reader;

public class JDBC {
    public static SqlSessionFactory GetConn() {
        Reader reader = null;
        try {
            reader = Resources.getResourceAsReader("mybatis-config.xml");
            return new SqlSessionFactoryBuilder().build(reader);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }
}

10、创建【com.item.dao】下的【ProductDAO.java】文件

package com.item.dao;

import com.item.common.JDBC;
import com.item.mapper.ProductMapper;
import com.item.model.Product;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;

import java.util.List;

public class ProductDAO {
    /**
     * 获取所有查询信息
     * @return
     */
    public static List<Product> GetInfo(){
        SqlSessionFactory factory = JDBC.GetConn();
        SqlSession session = factory.openSession();
        ProductMapper db = session.getMapper(ProductMapper.class);
        List<Product> list = db.GetInfo();
        session.close();
        return list;
    }

    /**
     * 删除
     * @param id
     * @return
     */
    public static boolean DeleteById(String id){
        SqlSessionFactory factory = JDBC.GetConn();
        SqlSession session = factory.openSession();
        ProductMapper db = session.getMapper(ProductMapper.class);
        int rows = db.DeleteById(id);
        session.commit();
        session.close();
        return rows>0;
    }
}

11、完成【servlet】访问层的【GetInfoServlet.java】接口文件

package com.item.servlet;

import com.item.dao.ProductDAO;
import com.item.model.Product;
import sun.misc.CharacterEncoder;

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("/GetInfo")
public class GetInfoServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        List<Product> list = ProductDAO.GetInfo();
        //发送至前台
        request.setAttribute("lists",list);
        request.getRequestDispatcher("GetInfo.jsp").forward(request,response);
    }

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

可以添加【DeleteByIdServlet】接口

package com.item.servlet;

import com.item.dao.ProductDAO;

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("/DeleteById")
public class DeleteByIdServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String id = request.getParameter("id");
        ProductDAO.DeleteById(id);
        response.sendRedirect("GetInfo");
    }

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

12、编辑视图文件【GetInfo.jsp】

<%@ page import="java.util.List" %>
<%@ page import="com.item.model.Product" %><%--
  Created by IntelliJ IDEA.
  User: Administrator
  Date: 2022/5/15 0015
  Time: 10:22
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>mybatis与servlet整合</title>
    <link rel="stylesheet" href="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/css/bootstrap.min.css">
</head>
<body>
<% List<Product> lists = (List<Product>) request.getAttribute("lists");%>
<table class="table table-bordered table-hover">
    <tr class="info">
        <th>编号</th>
        <th>创建时间</th>
        <th>修改时间</th>
        <th>产品名称</th>
        <th>产品标题</th>
        <th>产品价格</th>
        <th>产品数量</th>
        <th>产品厂家</th>
        <th>产品颜色</th>
        <th>产品重量</th>
        <th>产品状态</th>
        <th>操作</th>
    </tr>
    <% for (Product p : lists) {
    %>
    <tr>
        <td><%=p.getId()%>
        </td>
        <td><%=p.getCreateDate()%>
        </td>
        <td><%=p.getModifyDate()%>
        </td>
        <td><%=p.getProductName()%>
        </td>
        <td><%=p.getProductTitle()%>
        </td>
        <td><%=p.getProductPrice()%>
        </td>
        <td><%=p.getProductCount()%>
        </td>
        <td><%=p.getProductType()%>
        </td>
        <td><%=p.getProductColor()%>
        </td>
        <td><%=p.getProductWeight()%>
        </td>
        <td><%=p.getProductStatus()%>
        </td>
        <td>
            <a href="/DeleteById?id=<%=p.getId()%>" onclick="return confirm('是否删除此行？')" class="btn btn-primary">删除</a>
        </td>
    </tr>
    <%
        }%>
</table>
</body>
</html>