上一章我们已经集成struts2，本章我们主要将mybatis集成进来，方便我们持久层代码的编写。

首先添加相应的包：mybatis-3.1.1.jar，oracle驱动包：ojdbc14.jar

创建管理员用户存储表，用来查询登录页选择管理员的用户，数据稍后再插入。

CREATE TABLE admin(Admin_ID number(11),
Admin_Username varchar(20),
Admin_Password varchar(20),
Admin_Name varchar(20),
Admin_Sex varchar(10),
Admin_Tel varchar(20)
)

创建configuration.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"><!-- 注意：每个标签必须按顺序写，会提示错误：-->
<configuration><!-- 属性配置 --><properties resource="jdbc.properties"/><!-- 设置缓存和延迟加载等等重要的运行时的行为方式 --><settings><!-- 设置超时时间，它决定驱动等待一个数据库响应的时间  --><setting name="defaultStatementTimeout" value="25000"/></settings><!-- 别名 --><typeAliases><typeAlias alias="Admin" type="com.bean.AdminBean"/></typeAliases><environments default="development"><!-- environment 元素体中包含对事务管理和连接池的环境配置 --><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>
</configuration>

创建jdbc.properties

driver=oracle.jdbc.driver.OracleDriver
url=jdbc:oracle:thin:@127.0.0.1:1521:orcl
username=project
password=project

创建表对应的实体类：

package com.bean;
public class AdminBean {private int Admin_ID ;private String Admin_Username ;private String Admin_Password ;private String Admin_Name ;private String Admin_Sex ;private String Admin_Tel ;public int getAdmin_ID() {return Admin_ID;}public void setAdmin_ID(int adminID) {Admin_ID = adminID;}public String getAdmin_Username() {return Admin_Username;}public void setAdmin_Username(String adminUsername) {Admin_Username = adminUsername;}public String getAdmin_Password() {return Admin_Password;}public void setAdmin_Password(String adminPassword) {Admin_Password = adminPassword;}public String getAdmin_Name() {return Admin_Name;}public void setAdmin_Name(String adminName) {Admin_Name = adminName;}public String getAdmin_Sex() {return Admin_Sex;}public void setAdmin_Sex(String adminSex) {Admin_Sex = adminSex;}public String getAdmin_Tel() {return Admin_Tel;}public void setAdmin_Tel(String adminTel) {Admin_Tel = adminTel;}}

定义admin表的sql映射文件AdminUserMapper.xml,如果遇到mybatis配置问题，请自己查资料了解。

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper
PUBLIC "-//ibatis.apache.org//DTD Mapper 3.0//EN"
"http://ibatis.apache.org/dtd/ibatis-3-mapper.dtd">     <!-- namespace用于java代码调用时识别指定xml的mapper文件 -->
<mapper namespace="com.mybatis.model.Admin"><!-- 配置ORM映射 --><resultMap type="Admin" id="admin_orm"><result property="Admin_ID" column="ADMIN_ID"/><result property="Admin_Username" column="ADMIN_USERNAME"/><result property="Admin_Password" column="ADMIN_PASSWORD"/><result property="Admin_Name" column="ADMIN_NAME"/><result property="Admin_Sex" column="ADMIN_SEX"/><result property="Admin_Tel" column="ADMIN_TEL"/></resultMap><select id="selectByUsernameAndPassword" parameterType="map" resultType="Admin">SELECT * FROM ADMIN WHERE ADMIN_USERNAME= #{Admin_Username} and ADMIN_PASSWORD=#{Admin_Password}</select>
</mapper>

并将AdminUserMapper.xml,注册入configuration.xml中

<?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"><!-- 注意：每个标签必须按顺序写，会提示错误：-->
<configuration><!-- 属性配置 --><properties resource="jdbc.properties"/><!-- 设置缓存和延迟加载等等重要的运行时的行为方式 --><settings><!-- 设置超时时间，它决定驱动等待一个数据库响应的时间  --><setting name="defaultStatementTimeout" value="25000"/></settings><!-- 别名 --><typeAliases><typeAlias alias="Admin" type="com.bean.AdminBean"/></typeAliases><environments default="development"><!-- environment 元素体中包含对事务管理和连接池的环境配置 --><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><!-- ORM映射文件 --><mappers><mapper resource="com/mybatis/model/AdminUserMapper.xml" /></mappers></configuration>

创建mybatis的工具类，主要是用于避免重复造轮子，类似JDBC连接、关闭连接一样，用工具类来实现。

package com.utils;import java.io.IOException;
import java.io.Reader;import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;public class SessionFactoryUtil {private static final String RESOURCE = "Configuration.xml";private static SqlSessionFactory sqlSessionFactory = null;private static ThreadLocal<SqlSession> threadLocal = new ThreadLocal<SqlSession>();static {Reader reader = null;try {reader = Resources.getResourceAsReader(RESOURCE);} catch (IOException e) {throw new RuntimeException("Get resource error:"+RESOURCE, e);}sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader);}/*** Function  : 获得SqlSessionFactory*/public static SqlSessionFactory getSqlSessionFactory(){   return sqlSessionFactory;   }/*** Function  : 重新创建SqlSessionFactory*/public static void rebuildSqlSessionFactory(){Reader reader = null;try {reader = Resources.getResourceAsReader(RESOURCE);} catch (IOException e) {throw new RuntimeException("Get resource error:"+RESOURCE, e);}sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader);}/*** Function  : 获取sqlSession*/public static SqlSession getSession(){SqlSession session = threadLocal.get();if(session!=null){if(sqlSessionFactory == null){getSqlSessionFactory();}//如果sqlSessionFactory不为空则获取sqlSession，否则返回nullsession = (sqlSessionFactory!=null) ? sqlSessionFactory.openSession(): null;}return session;}/*** Function  : 关闭sqlSession*/public static void closeSession(){SqlSession session = threadLocal.get();threadLocal.set(null);if(session!=null){session.close();}}
}

创建AdminDao持久层接口以及实现类。

package com.dao;import com.bean.AdminBean;public interface AdminDao {/*** @date 2016-10-18 下午6:03:50* @Title: CheckLogin* @Description: 根据用户名称以及密码验证是否存在该管理员账号* @return String    返回类型* @throws*/public String CheckLogin(AdminBean admin);}

package com.dao.impl;import java.util.HashMap;
import java.util.Map;import org.apache.ibatis.session.SqlSession;import com.bean.AdminBean;
import com.dao.AdminDao;
import com.utils.SessionFactoryUtil;public class AdminDaoImpl implements AdminDao{@Overridepublic String CheckLogin(AdminBean admin) {SqlSession session = SessionFactoryUtil.getSqlSessionFactory().openSession();Map<String,Object> params = new HashMap<String ,Object>();params.put("Admin_Username", admin.getAdmin_Name());params.put("Admin_Password", admin.getAdmin_Password());AdminBean adminbean = (AdminBean) session.selectOne("com.mybatis.model.Admin.selectByUsernameAndPassword", params);session.close();if(adminbean!=null){return adminbean.getAdmin_ID()+"";}return null;}
}

单元测试类通过显示"用户不存在"

package com.Junit;import org.junit.Test;import com.bean.AdminBean;
import com.dao.AdminDao;
import com.dao.impl.AdminDaoImpl;public class AdminJunitTest {private AdminDao adminDao=new AdminDaoImpl();@Testpublic void testLoad(){AdminBean bean=new AdminBean();bean.setAdmin_Name("zhangsan");bean.setAdmin_Password("123");boolean exist = adminDao.CheckLogin(bean);if(exist){System.out.println("用户存在");}else{System.out.println("用户不存在！！");}}
}

我们往数据库塞一条数据：

insert into ADMIN (ADMIN_ID, ADMIN_USERNAME, ADMIN_PASSWORD, ADMIN_NAME, ADMIN_SEX, ADMIN_TEL)
values (1, 'zhangsan', '123', '张三', '男', '159********');

执行上面的单元测试，测试结果：“用户存在”。

至此，mybatis的简单集成以及工具类都已经做好，剩下的就是action的配置以及其他功能dao的完成。