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 {@Overrideprotected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {this.doPost(request, response);}@Overrideprotected 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 mapperPUBLIC "-//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 configurationPUBLIC "-//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 {@Testpublic 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);}
}