Springmvc and mybatis integration (notes)

Database preparation

mysql> CREATE DATABASE IF NOT EXISTS test_db_char
    -> DEFAULT CHARACTER SET utf8
    -> DEFAULT COLLATE utf8_chinese_ci;

create table menu(
id int primary key ,
name varchar(20),
pid int
)

insert into menu values(1,'系统设置',0);
insert into menu values(2,'销售管理',0);
insert into menu values(3,'修改密码',1);
insert into menu values(4,'添加用户',1);
insert into menu values(5,'销售人员新增',2);
insert into menu values(6,'删除销售人员',2);

Open the remote connection of the
database Database connection configuration: https://blog.csdn.net/isomebody/article/details/73012417 download driver
eclipse how to import MySQL JDBC driver to operate the database with java

Import jar

1. Configure web.xml: configure listeners, controllers, and context parameters

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
xmlns="http://java.sun.com/xml/ns/javaee" 
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">

<!-- Spring的监听器和上下文参数 --> 
<!-- 上下文参数 -->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:applicationContext.xml</param-value>
</context-param>
<!-- 监听器 -->
  <listener>
      <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>
  
 <!-- SpringMVC前端控制器 -->
  <servlet>
  <servlet-name>springmvc</servlet-name>
  <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
  <init-param>
  <param-name>contextConfigLocation</param-name>
  <param-value>classpath:springmvc.xml</param-value>
  </init-param>
  <load-on-startup>1</load-on-startup><!-- Tomcat启动，该类被加载 -->
  </servlet>
  <servlet-mapping>
  <servlet-name>springmvc</servlet-name>
  <url-pattern>/</url-pattern>
  </servlet-mapping>
  
  
  
  <!-- 字符编码过滤器 -->
  <filter>
  <filter-name>encoding</filter-name>
  <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
  <init-param>
  <param-name>encoding</param-name>
  <param-value>UTF-8</param-value>
  </init-param>
  </filter>
  <filter-mapping>
  <filter-name>encoding</filter-name>
  <url-pattern>/*</url-pattern>
  </filter-mapping>
</web-app>

2.applicationContext.xml: configure mybatis

<?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:aop="http://www.springframework.org/schema/aop"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xmlns:context="http://www.springframework.org/schema/context" 
       xsi:schemaLocation="http://www.springframework.org/schema/beans 
          http://www.springframework.org/schema/beans/spring-beans.xsd 
          http://www.springframework.org/schema/aop
          http://www.springframework.org/schema/aop/spring-aop.xsd
          http://www.springframework.org/schema/context 
          http://www.springframework.org/schema/context/spring-context.xsd 
          http://www.springframework.org/schema/tx 
          http://www.springframework.org/schema/tx/spring-tx.xsd" default-autowire="byName">

<!--扫描service包-->
<context:component-scan base-package="com.service.impl"></context:component-scan>
<!--加载属性文件  并  创建数据源连接池-->
<context:property-placeholder location="classpath:jdbc.properties"></context:property-placeholder>
<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="${jdbc.driver}"></property>
<property name="url" value="${jdbc.url}"></property>
<property name="username" value="${jdbc.username}"></property>
<property name="password" value=""></property>
</bean>

<!-- Spring 整合mybatis -->
<!--创建mybatis的SqlSessionFactory工厂类对象-->
<bean id="factory" class="org.mybatis.spring.SqlSessionFactoryBean"><!--mybatis-spring-1.2.2  -->
<property name="dataSource" ref="dataSource"></property>
<property name="typeAliasesPackage" value="com.pojo"></property> <!-- <resultMap type="menu" id="mymap">类型别名，对包下的类起个别名 -->
</bean>

<!--扫描器:配置扫描mybatis的dao接口 ，会为dao接口创建myabtis的dao接口实现类对象，放置到session工厂中-->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="com.bjsxt.mapper"></property>
<property name="sqlSessionFactoryBeanName" value="factory"></property>
</bean>



<!--声明spring 的事物管理器对象-->
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource"></property>
</bean>
<!--声明以注解的方式配置spring 的事物-->
<tx:advice id="txAdvice" transaction-manager="transactionManager">
   <tx:attributes>
   <tx:method name="ins*"/>
   <tx:method name="del*"/>
   <tx:method name="upd*"/>
   <tx:method name="*" read-only="true"/>
   </tx:attributes>
</tx:advice>


<!-- 配置aop-Aspect Oriented Programming -->
<aop:config>
<aop:pointcut  expression="execution(* com.bjsxt.service.impl.*.*(..))" id="mypointcut"/>
<aop:advisor advice-ref="txAdvice" pointcut-ref="mypointcut"/>
</aop:config>


</beans>

jdbc.properties

sqlserver connection configuration:

jdbc.driver=com.microsoft.sqlserver.jdbc.SQLServerDriver
jdbc.url=jdbc:sqlserver://localhost;DatabaseName=[read]
jdbc.username=sa
jdbc.password=

mysql connection configuration:

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/read
jdbc.username=root
jdbc.password=

3.springmvc.xml: configure the front controller

<?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:mvc="http://www.springframework.org/schema/mvc"
    xsi:schemaLocation="http://www.springframework.org/schema/beans 
    http://www.springframework.org/schema/beans/spring-beans-4.1.xsd
    http://www.springframework.org/schema/context
    http://www.springframework.org/schema/context/spring-context-4.1.xsd 
    http://www.springframework.org/schema/mvc
    http://www.springframework.org/schema/mvc/spring-mvc-4.1.xsd">
    <!-- 扫描注解 -->
    <context:component-scan base-package="com.bjsxt.controller"></context:component-scan>
    <!-- 注解驱动 -->
    <mvc:annotation-driven></mvc:annotation-driven>
    <!-- 静态资源不拦截配置                                                     请求格式：*表示所有文件，**表示所有文件及子文件-->
    <mvc:resources location="/js/" mapping="/js/**"></mvc:resources>
    
    
    <!-- 视图解析器 -->
    <bean id="vierResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    <property name="prefix" value="/"></property>
    <property name="suffix" value=".jsp"></property>
    </bean>
    </beans>

POJO (Plain Ordinary Java Object) simple Java objects are actually ordinary JavaBeans, which are abbreviations created to avoid confusion with EJB.
The attributes in the Menu database plus the corresponding get and set methods

Controller code:

import java.util.List;

import javax.annotation.Resource;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import com.pojo.Menu;
import com.service.MenuService;


@Controller
public class MenuController {
    
    
	
	/*Springmvc容器调用Spring容器中内容*/
	@Resource
	private MenuService menuServiceImpl;/*@Resource默认是byname注入，名字不同会根据类别*/
	
	
	@RequestMapping("show")
	@ResponseBody
    public List<Menu> show(){
    
    
		System.out.println("show");
		return menuServiceImpl.show();
		}
    
    
}

Mybatis database things and configuration under the same path

import java.util.List;

import com.pojo.Menu;

public interface MenuMapper {
    
    
    List<Menu> selBypid(int pid);
}

MenuMapper.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.bjsxt.mapper.MenuMapper">
  <resultMap type="menu" id="mymap">
      <id property="id" column="id"/>
      <collection property="children" select="com.bjsxt.mapper.MenuMapper.selBypid" column="id"></collection>
  </resultMap>
  <select id="selBypid" parameterType="int" resultMap="mymap">
     select * from menu where pid=#{0}
  </select>
</mapper>

Methods called at runtime

The interface and implementation class will be automatically registered to the Spring container

public interface MenuService {
    
    

	List<Menu> show();
}

@Service
public class MenuServiceImpl implements MenuService{
    
    
    @Resource
	private MenuMapper meunMapper;
	
	@Override
	public List<Menu> show() {
    
    
		// TODO Auto-generated method stub
		
		return meunMapper.selBypid(0);
	}

}

Calling process: show->controler->MenuServiceImpl ->meunMapper->mybatis

---

@RequestParam, @ResponseBody use
@Service annotation use