需求：

通过html+Servlet+MyBatis，完成站点信息的添加功能。

以下是站点表的建表语句：

CREATE TABLE `websites` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` char(20) NOT NULL DEFAULT '' COMMENT '站点名称',
  `url` varchar(255) NOT NULL DEFAULT '',
  `alexa` int(11) NOT NULL DEFAULT '0' COMMENT 'Alexa 排名',
  `country` char(10) NOT NULL DEFAULT '' COMMENT '国家',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=10 DEFAULT CHARSET=utf8;

步骤：

RegisterServlet：

package com.ambow.controller;

import com.ambow.dao.UserDao;
import com.ambow.pojo.User;
import com.ambow.util.MyBatisUtil;
import org.apache.ibatis.session.SqlSession;

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

@WebServlet("/doRegister")
public class RegisterServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        this.doPost(request, response);
    }

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //1.修改编码
        request.setCharacterEncoding("utf-8");
        response.setContentType("text/html;charset=utf-8");
        //2.获取参数
        String name = request.getParameter("name");
        String url = request.getParameter("url");
        Integer alexa = Integer.valueOf(request.getParameter("alexa"));
        String country = request.getParameter("country");
        //3.构建对象
        User user = new User(name, url, alexa, country);
        //4.获取代理对象
        SqlSession sqlSession = MyBatisUtil.getSqlSession();
        UserDao mapper = sqlSession.getMapper(UserDao.class);
        //5.执行添加
        PrintWriter out = response.getWriter();

        int row = mapper.insertUser(user);
        sqlSession.commit();
        if (row != 0) {
            out.println("<h1 align='center'>添加成功！！！</h1>");
        } else {
            out.println("<h1 align='center'>添加失败！！！</h1>");

        }

    }
}

UserDao：

package com.ambow.dao;

import com.ambow.pojo.User;

public interface UserDao {
    int insertUser(User user);
}

User：

package com.ambow.pojo;

import lombok.Data;
import lombok.NoArgsConstructor;

@Data
@NoArgsConstructor
public class User {
    private int id;
    private String name;
    private String url;
    private int alexa;
    private String country;

    public User(String name, String url, int alexa, String country) {
        this.name = name;
        this.url = url;
        this.alexa = alexa;
        this.country = country;
    }
}

MyBatisUtil：

package com.ambow.util;

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

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

public class MyBatisUtil {
    //获取数据库链接
    public static SqlSession getSqlSession(){
        SqlSession sqlSession = null;
        //读取主配置文件
        String resource = "mybatis-config.xml";
        InputStream inputStream = null;
        try {
            inputStream = Resources.getResourceAsStream(resource);
            //获取SqlSessionFactory - 工厂对象
            SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);

            //获取SqlSession - 连接对象
            sqlSession = sqlSessionFactory.openSession();
        } catch (IOException e) {
            e.printStackTrace();
        }

        return sqlSession;
    }
}

UserDao.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.ambow.dao.UserDao">

    <insert id="insertUser">
        insert into websites values(null,#{name},#{url},#{alexa},#{country})
    </insert>
</mapper>

jdbc.properties：

driver=com.mysql.jdbc.Driver
url=jdbc:mysql://192.168.2.111:3306/db1
username=root
password=Mysql666!

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>
    <properties resource="jdbc.properties" />

    <settings>
        <!--开启数据库日志检测-->
        <setting name="logImpl" value="STDOUT_LOGGING"/>
    </settings>

    <typeAliases>
        <!--<typeAlias type="com.ambow.pojo.User" alias="user"></typeAlias>-->
        <package name="com.ambow.pojo"/>
    </typeAliases>

    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC"/>
            <dataSource type="POOLED">
                <property name="driver" value="${driver}"/>
                <property name="url" value="${url}"/>
                <property name="username" value="${username}"/>
                <property name="password" value="${password}"/>
            </dataSource>
        </environment>
    </environments>
    <mappers>
        <package name="com.ambow.dao"/>
    </mappers>


</configuration>

web.xml：

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
         version="4.0">
</web-app>

<!DOCTYPE html>
<html>
<head>
    <title>站点信息</title>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link href="https://cdn.staticfile.org/twitter-bootstrap/5.1.1/css/bootstrap.min.css" rel="stylesheet">
    <script src="https://cdn.staticfile.org/twitter-bootstrap/5.1.1/js/bootstrap.bundle.min.js"></script>
</head>
<body>

<div class="container mt-2">
    <h1><b>新增站点</b></h1>
    <br>
    <form action="doRegister" method="post">
        <div class="mb-2 mt-2">
            <label for="webname" class="form-label">站点名称：</label>
            <input type="text" class="form-control" id="webname" placeholder="请输入站点名称" name="webname">
        </div>
        <br>
        <div class="mb-2">
            <label for="url" class="form-label">站点网址：</label>
            <input type="text" class="form-control" id="url" placeholder="请输入站点网址" name="url">
        </div>
        <br>
        <div class="mb-2 mt-2">
            <label for="alexa" class="form-label">站点排名：</label>
            <input type="text" class="form-control" id="alexa" placeholder="输入站点的名次" name="alexa">
        </div>
        <br>
        <div class="mb-2 mt-2">
            <label for="country" class="form-label">所在国家：</label>
            <select class="form-select" id="country" name="country">
                <option value="中国">中国</option>
                <option value="美国">美国</option>
                <option value="印度">印度</option>
                <option value="日本">日本</option>
                <option value="德国">德国</option>
            </select>
        </div>
        <br>
        <div class="mb-4 mt-4">
            <label for="sign" class="form-label">简要介绍：</label>
            <br/>
            <textarea cols="40" rows="10" id="sign" name="sign"></textarea>
        </div>
        <button type="submit" class="btn btn-primary">添加</button>
    </form>
</div>

</body>
</html>

RegTest：

package com.ambow.test;

import com.ambow.dao.UserDao;
import com.ambow.pojo.User;
import com.ambow.util.MyBatisUtil;
import org.apache.ibatis.session.SqlSession;
import org.junit.Test;

public class RegTest {
    @Test
    public void test01(){
        SqlSession sqlSession = MyBatisUtil.getSqlSession();
        UserDao userDao = sqlSession.getMapper(UserDao.class);
        User user = new User();
        user.setName("淘宝");
        user.setUrl("http://taobao.com");
        user.setAlexa(20);
        user.setCountry("中国");
        int i = userDao.insertUser(user);
        sqlSession.commit();
        System.out.println(i);
    }
}