MyBatis(登录)

<?xml version="1.0" encoding="UTF-8"?>
<!-- xml文件的头文件，起到对文件的约束作用(例如:必须存在哪些节点) -->
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration><!--核心配置-->
    <!--引入jdbc配置，数据库核心的四要素-->
    <properties resource="jdbc.properties"/>
    <!--集成log4j配置-->
    <settings>
        <setting name="logImpl" value="LOG4J"/>
    </settings>
    <!--配置别名-->
    <typeAliases>
        <!--方式一：单个别名-->
        <!--<typeAlias type="com.wdksoft.entity.user" alias="user"></typeAlias>-->
        <!--方式二：全局别名-->
        <package name="com.wdksuper.entity"></package><!--这个包下的所有实体类的别名都是简写的类名-->
        <!--com.wdksoft.entity.user 别名为 user-->
    </typeAliases>
    <environments default="development">
        <environment id="development">
            <!--设置事务管理 采用JDBC事务 后续会将事务管理转移到Spring-->
            <transactionManager type="JDBC" />
            <!-- 配置数据库连接信息 MyBatis自带的数据源 其它取值为UNPOOLED和JNDI -->
            <dataSource type="POOLED">
                <property name="driver" value="${jdbc.driver}" />
                <property name="url" value="${jdbc.url}" />
                <property name="username" value="${jdbc.username}" />
                <property name="password" value="${jdbc.password}" />
            </dataSource>
        </environment>
    </environments>
    <mappers><!--管理我们配置的映射文件-->
        <mapper resource="com/wdksuper/dao/smbms_userMapper.xml"></mapper>
    </mappers>
</configuration>

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/smbms?useUniCode=true&characterEncoding=utf-8
jdbc.username=root
jdbc.password=123

### direct log messages to stdout 记录日志信息到控制台###
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.out
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n

### direct messages to file log.txt 记录日志信息到硬盘上的文件中 ###
log4j.appender.file=org.apache.log4j.FileAppender
log4j.appender.file.File=d:/log.txt
log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n
### set log levels - for more verbose logging change ‘info‘ to ‘debug‘ ###
log4j.rootLogger=debug, stdout,file

<?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">
<!--namespace需要指向接口全路径-->
<mapper namespace="com.wdksuper.dao.userDao">
    <!--id代表当前命名空间下（接口下）的唯一方法名   resultType代表返回值类型-->
    <select id="selectpwd" resultType="smbms_user">
       select * from smbms_user where userCode=#{userCode}
    </select>
</mapper>

package com.wdksuper.dao;

import com.wdksuper.entity.smbms_user;

public interface userDao {
    //登录（根据用户名查密码）
    public smbms_user selectpwd(String userCode);
}

package com.wdksuper.entity;

public class smbms_user {
    private Integer id;
    private String userCode;
    private String userName;
    private String userPassword;
    private Integer gender;

    public Integer getId() {
        return id;
    }

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

    public String getUserCode() {
        return userCode;
    }

    public void setUserCode(String userCode) {
        this.userCode = userCode;
    }

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

    public String getUserPassword() {
        return userPassword;
    }

    public void setUserPassword(String userPassword) {
        this.userPassword = userPassword;
    }

    public Integer getGender() {
        return gender;
    }

    public void setGender(Integer gender) {
        this.gender = gender;
    }
}

package com.wdksuper.service;

import com.wdksuper.entity.smbms_user;

public interface userservice {
    //登录（根据用户名查密码）
    public smbms_user selectpwd(String userCode,String userPassword);
}

import com.wdksuper.dao.userDao;
import com.wdksuper.entity.smbms_user;
import com.wdksuper.service.userservice;
import com.wdksuper.util.MyBatisUtil;
import org.apache.ibatis.session.SqlSession;

public class userserviceimpl implements userservice {

    SqlSession session= MyBatisUtil.getSession();

    @Override
    public smbms_user selectpwd(String userCode, String userPassword) {
        smbms_user selectpwd = session.getMapper(userDao.class).selectpwd(userCode);
        if(selectpwd!=null&&selectpwd.getUserPassword().equals(userPassword)){
            return selectpwd;
        }else{
            return null;
        }
    }
}

package com.wdksuper.servlet;

import com.wdksuper.entity.smbms_user;
import com.wdksuper.service.impl.userserviceimpl;
import com.wdksuper.service.userservice;

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("/userServlet")
public class userServlet extends HttpServlet {

    userservice userss=new userserviceimpl();

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String name=request.getParameter("username");
        String pwd=request.getParameter("password");
        smbms_user selectpwd = userss.selectpwd(name, pwd);
        if(selectpwd!=null){
            request.getRequestDispatcher("welcome.jsp").forward(request,response);
        }else{
            response.sendRedirect("login.jsp");
        }
    }

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

package com.wdksuper.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;

/**
 * 获取SqlSession对象的
 */
public class MyBatisUtil {
    //01.创建需要单例的静态对象
    private  static SqlSessionFactory sessionFactory;

    //02.私有化构造
    private MyBatisUtil(){}

    //03.提供对外访问的接口
    public static synchronized SqlSession getSession() {
        try {
            //把xml文件读取到内存中 并且返回一个输入流对象
            InputStream stream = Resources.getResourceAsStream("mybatis-config.xml");
            if (sessionFactory == null) {
                //创建SqlSessionFactory
                sessionFactory = new SqlSessionFactoryBuilder().build(stream);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        return sessionFactory.openSession();
    }

}