mybatis和springMVC的整合

最新推荐文章于 2022-06-09 22:21:34 发布

原创最新推荐文章于 2022-06-09 22:21:34 发布 · 293 阅读

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#java #spring mvc #mybatis #intellij idea #数据库

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本文详细介绍了如何整合MyBatis与SpringMVC框架，包括搭建开发环境、配置文件设置、代码编写等步骤，并通过具体示例验证了整合效果。

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Mybatis和springMVC整合

一、对于一些初步学习框架的同学而言，配置环境无疑是让人头疼的事情，感觉条理很混乱，接下来我这篇文章就是讲解一下mybatis和springmvc的一些整合步骤，屡清一下思路。

二、开发工具：IntelliJ IDEA

数据库：Mysql

开发环境：jdk1.8 tomcat8

三、导入jar包，

四、在src目录下新建config目录，用来存放一些配置文件，使项目更加条理清晰，然后分别新建mybatis和spring目录，再建一个com包，存放java代码。如图所示，

db.properties是建立在config目录下的，里面配置的是数据库连接文件，内容如下

db.driver=com.mysql.jdbc.Driver
db.url=jdbc:mysql://localhost:3306/ssm?useUnicode=true&characterEncoding=utf8
db.username=root
db.password=123456

当然这是我的数据库连接信息，你要改成自己的。

在mybatis目录下新建SqlMaoConfig.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">
<configuration>
    
    <typeAliases>
        <package name="com_sweep.pojo"></package>
    </typeAliases>
    <mappers>
        <mapper resource="com_sweep/mapper/UserMapper.xml"></mapper>
    </mappers>
</configuration>

配置dao层文件，在spring包下新建Applicationcontext-dao.xml：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:context="http://www.springframework.org/schema/context" xmlns:p="http://www.springframework.org/schema/p"
       xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
   http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd
   http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
   http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.0.xsd ">

    
    <context:property-placeholder location="classpath:config/db.properties" />
    
    <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
          destroy-method="close">
        <property name="driverClassName" value="${db.driver}" />
        <property name="url" value="${db.url}" />
        <property name="username" value="${db.username}" />
        <property name="password" value="${db.password}" />
        <property name="maxActive" value="10" />
        <property name="maxIdle" value="5" />
    </bean>

    
    
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        
        <property name="dataSource" ref="dataSource" />
        
        <property name="configLocation" value="classpath:config/mybatis/SqlMapConfig.xml" />
    </bean>

    
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com_sweep.mapper"/>
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
    </bean>

    
    <bean id="transactionManager"
          class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        
        <property name="dataSource" ref="dataSource" />
    </bean>

    
    <tx:advice id="txAdvice" transaction-manager="transactionManager">
        <tx:attributes>
            
            <tx:method name="save*" propagation="REQUIRED" />
            <tx:method name="insert*" propagation="REQUIRED" />
            <tx:method name="delete*" propagation="REQUIRED" />
            <tx:method name="update*" propagation="REQUIRED" />
            <tx:method name="find*" propagation="SUPPORTS" read-only="true" />
            <tx:method name="get*" propagation="SUPPORTS" read-only="true" />
            <tx:method name="query*" propagation="SUPPORTS" read-only="true" />
            <tx:method name="select*" propagation="SUPPORTS" read-only="true" />
        </tx:attributes>
    </tx:advice>

    
    <aop:config>
        <aop:advisor advice-ref="txAdvice"
                     pointcut="execution(* com_sweep.service.*.*(..))" />
    </aop:config>
</beans>

在spring目录下新建spring-mvc.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:p="http://www.springframework.org/schema/p"
       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.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd
        http://www.springframework.org/schema/mvc
        http://www.springframework.org/schema/mvc/spring-mvc.xsd ">

    <context:component-scan base-package="com_sweep"/>
    
    <mvc:annotation-driven></mvc:annotation-driven>
    
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">

        <property name="prefix" value="/WEB-INF/pages/"/>
        <property name="suffix" value=".jsp"/>
    </bean>

    
    <mvc:default-servlet-handler/>
</beans>

在spring目录下新建Application-service.xml:

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_3_1.xsd"
         version="3.1">

    
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:config/spring/Applicationcontext-*.xml</param-value>
    </context-param>
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

    
    <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:config/spring/spring-mvc.xml</param-value>
        </init-param>
        
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>springMvc</servlet-name>
        <url-pattern>*.action</url-pattern>
    </servlet-mapping>

    
    <filter>
        <filter-name>CharacterEncodingFilter</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>CharacterEncodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
</web-app>

到现在为止，基本就配置完成了，现在测试一下，在pojo目录下新建User类，在mapper目录下新建UserMapper接口:

package com_sweep.mapper;

import com_sweep.pojo.User;

public interface UserMapper {
public User findUserById(int id);
}

在mapper目录下新建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_sweep.mapper.UserMapper">
<select id="findUserById" parameterType="int" resultType="User">
select * from users where id=#{id}
</select>
</mapper>

Service层定义一个UserService接口，和他的实现类，在controller下新建UserController类如下：

package com_sweep.controller;
import com_sweep.mapper.UserMapper;
import com_sweep.pojo.User;
import com_sweep.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
@RequestMapping("/user")
public class UserController {
    @Autowired
    private UserService userService;
    @RequestMapping("/login")
    public String login(Integer id,Model model){
        User user=userService.findUserById(id);
        model.addAttribute("u",user);
        return "hello";
    }
}