【SSM架构】博客系统开发(六)-添加Mybatis

1 说明

今天的进度是在昨天SpringMVC搭建好的情况下继续开发的,下图是加入mybatis后整个项目的流程图

首先login页面进行登陆,带着用户名和密码发起访问,控制层UserController
接受了这次请求,接受到了用户名和密码,下面需要和数据库的用户名和密码进行判断,UserController通知了UserService进行数据库操作,UserService让UserServiceImpl去处理,调用UserMapper接口,UserMapper.xml执行了编写的sql语句最终获取了用户名和密码,控制层在进行数据判断交给login或者index

2 项目目录

3 配置mybatis

(1) 引入mybatis相关的jar包

通过配置pom.xml 引入jar包

  <properties>
		<spring.version>4.2.0.RELEASE</spring.version>
		<!--声明mybatis的版本 (这个注释不要这样粘上去 -->
		<mybatis.version>3.4.0</mybatis.version>
  </properties>
  
<!--添加mybatis支持-->
	<dependency>
       <groupId>org.mybatis</groupId>
       <artifactId>mybatis</artifactId>
       <version>${mybatis.version}</version>
   </dependency>
   <dependency>
       <groupId>org.mybatis</groupId>
       <artifactId>mybatis-spring</artifactId>
       <version>1.3.0</version>
   </dependency>
 <!-- 引入mysql相关的驱动类,和阿里巴巴的 druid 连接池-->
		<dependency>
          <groupId>mysql</groupId>
          <artifactId>mysql-connector-java</artifactId>
          <version>5.1.30</version>
      </dependency>
      <dependency>
          <groupId>com.alibaba</groupId>
          <artifactId>druid</artifactId>
          <version>1.0.16</version>
      </dependency>

(2) 配置mybatis

在 src/main/resources 下建 mybatis 目录
里面放 mybatis-config.xml ,内容如下:

<?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>
        <!--开启自动驼峰命名规映射 -->
        <setting name="mapUnderscoreToCamelCase" value="true"/>
    </settings>  
</configuration>

(3) 建数据库的配置文件 db.properties

放在 src/main/resources/ 内容如下:

mysql.url=jdbc:mysql://127.0.0.1:3306/blog-douyuzhi?useUnicode=true&characterEncoding=utf8
mysql.username=root
mysql.password=root

(4) 建目录 src/main/mybatis/mapper

里面专门放mybatis的映射文件

(5) 建数据访问层接口

相当于以前的dao层

public interface UserMapper {
/**
	 * 用户登录
	 * @param userName 账号
	 * @param password 密码
	 * @return 用户信息
	 */
	User login(@Param("userName") String userName ,@Param("password") String password);
}

(6) 建 Mapper 接口对应的映射文件

src/main/mybatis/mapper/UserMapper.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.mapper.UserMapper">
	<select id="login" resultType="User">
		select * from User where user_name=#{userName} and user_pass=#{password}
	</select>
</mapper>

(7) 要在spring中配置管理mybatis (整合)

src/main/resources/spring/spring-mybatis.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns:context="http://www.springframework.org/schema/context"
	xmlns:tx="http://www.springframework.org/schema/tx"
	xmlns:aop="http://www.springframework.org/schema/aop"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.2.xsd
		http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.1.xsd
		http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.1.xsd">

	<!-- 加载数据库相关的配置文件 -->
	 <context:property-placeholder location="classpath:dbconfig.properties"/>
	 
	<!-- 配置数据源 -->
	 <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close">
        <property name="driverClassName" value="com.mysql.jdbc.Driver" />
        <property name="url" value="${mysql.url}" />
        <property name="username" value="${mysql.username}" />
        <property name="password" value="${mysql.password}" />
     </bean>
     
     <!-- 配置 sqlSessionFactory -->
 	<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!--数据库连接池-->
        <property name="dataSource" ref="dataSource"/>
        
        <!--加载mybatis全局配置文件-->
        <property name="configLocation" value="classpath:mybatis/mybatis-config.xml"/>
        
        <!--mapper.xml所在位置-->
        <property name="mapperLocations" value="classpath*:mybatis/mapper/*Mapper.xml" />
        
        <!--指定需要使用别名的PO类所在的包-->
        <property name="typeAliasesPackage" value="com.entity" />   
     </bean>

	<!-- 配置Mapper扫描器 -->
  	<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <!--如果需要扫描多个包，中间使用半角逗号隔开-->
        <property name="basePackage" value="com.mapper"></property>
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
    </bean>
    
    <!-- 配置事务管理器 -->
     <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <!-- 数据源,就是上面配置的druid数据源- -->
        <property name="dataSource" ref="dataSource"/>
     </bean>
    
    <!-- 配置事务管理 -->
    <tx:advice id="txAdvice" transaction-manager="transactionManager">
        <tx:attributes>
            <tx:method name="save*" propagation="REQUIRED"/>
            <tx:method name="delete*" propagation="REQUIRED"/>
            <tx:method name="update*" propagation="REQUIRED"/>
            <tx:method name="add*" propagation="REQUIRED"/>
            <tx:method name="find*" propagation="SUPPORTS" read-only="true"/>
            <tx:method name="get*" propagation="SUPPORTS" read-only="true"/>
            <tx:method name="select*" propagation="SUPPORTS" read-only="true"/>
        </tx:attributes>
    </tx:advice>

	<!-- 哪些方法要受上面的事务管理 -->
    <aop:config>
        <aop:advisor advice-ref="txAdvice" pointcut="execution(* com.service.impl.*.*(..))"/>
    </aop:config>	

</beans>

4 控制层和业务层代码

(1)建UserService.java

它在 com.servce 包下

package com.service;
import com.entity.User;
/**
 * 用户 业务层接口
 */
public interface UserService {
	/**
	 * 用户登录
	 * @param userName 账号
	 * @param password 密码
	 * @return 用户信息
	 */
	User login(String userName ,String password);
}

(2)建UserServiceImpl.java

业务层的实现 在com.service.impl 包下

package com.service.impl;
import javax.annotation.Resource;
import org.springframework.stereotype.Service;
import com.entity.User;
import com.mapper.UserMapper;
import com.service.UserService;

/**
 * 业务层的实现类
 */
@Service
public class UserServiceImpl implements UserService {
	@Resource
	private UserMapper userMapper;
	
	public User login(String userName, String password) {
		return userMapper.login(userName, password);
	}
}

(3)建控制层AdminController.java

控制层的实现 在com.controller包下

package com.controller;
import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import com.entity.User;
import com.service.UserService;
@Controller
public class AdminController {
	@Resource
	private UserService userService;
	@RequestMapping("/login")
	public String login(String userName,String userPass,HttpServletRequest request) {
		//接收客户端传过来的参数 本例通过方法的参数直接传过来

		//调用dao层来进行数据访问
		User  user =userService.login(userName, userPass);
		if(user!=null ) {		
			//把当前登录用户的信息放到 session 中,为了以后全局共享
			request.getSession().setAttribute("session_user", user);		
			return  "index";  
		}
		else {
			request.setAttribute("msg", "用户或或密码错误,登录失败");
			return  "login";  
		}
	}	
}

5 数据库表user代码

/*
Navicat MySQL Data Transfer

Source Server         : sql
Source Server Version : 50729
Source Host           : localhost:3306
Source Database       : blog

Target Server Type    : MYSQL
Target Server Version : 50729
File Encoding         : 65001

Date: 2020-06-19 12:53:35
*/

SET FOREIGN_KEY_CHECKS=0;

-- ----------------------------
-- Table structure for `user`
-- ----------------------------
DROP TABLE IF EXISTS `user`;
CREATE TABLE `user` (
  `user_id` int(11) unsigned NOT NULL AUTO_INCREMENT,
  `user_name` varchar(255) NOT NULL DEFAULT '',
  `user_pass` varchar(255) NOT NULL DEFAULT '',
  `user_nickname` varchar(255) NOT NULL DEFAULT '',
  `user_email` varchar(100) DEFAULT '',
  `user_url` varchar(100) DEFAULT '',
  `user_avatar` varchar(255) DEFAULT NULL,
  `user_last_login_ip` varchar(255) DEFAULT NULL,
  `user_register_time` datetime DEFAULT NULL,
  `user_last_login_time` datetime DEFAULT NULL,
  `user_status` int(1) unsigned DEFAULT '1',
  PRIMARY KEY (`user_id`),
  UNIQUE KEY `user_name` (`user_name`),
  UNIQUE KEY `user_email` (`user_email`)
) ENGINE=MyISAM AUTO_INCREMENT=3 DEFAULT CHARSET=utf8;

-- ----------------------------
-- Records of user
-- ----------------------------
INSERT INTO `user` VALUES ('1', 'admin', '123456', '言曌', '[email protected]', 'https://liuyanzhao.com', '/uploads/2017/10/20171006225356181.jpg', '0:0:0:0:0:0:0:1', '2017-10-06 21:56:33', '2019-04-25 21:55:53', '1');
INSERT INTO `user` VALUES ('2', 'zhangsna', '123456', '张三', '[email protected]', '', '/uploads/2018/11/avatar(1).jpg', null, '2018-11-25 14:45:08', null, '1');

6 实现效果

登陆界面login.jsp

主界面index.jsp