SpringMVC整合MyBatis XML配置版

背景

写久了Spring Boot快速构建，虽然能加速web开发进度，但是给人的感觉Spring Boot就是一个黑盒子，如果想搞明白Spring Boot的原理，每当用户集成一个框架的时候大家必须认真的看一下Spring Boot自动配置的源代码，否则项目不出错还好，一旦出错悲催了，Spring Boot就像是双刃剑有利有弊，个人建议在不熟练掌握Spring IOC/DI 、AOP常规注解和Servlet-3.0规范不建议使用Spring Boot,因为如果这些注解大家都不熟悉，使用Spring Boot 个人觉得是对自己的侮辱，因为在你不明白这些原理之前，就贸然的使用，个人觉得你学到的仅仅是皮毛，很难深入下去。

好了不扯淡了，开始记录一下如何基于Maven 构建Spring MVC 和 MyBatis整合案例，本篇文章属于传统开发常见整合案例，适合初学者第一次Maven 整合 SSM

依赖导入

使用IDEA或者Eclipse借助于Maven Webapp的脚手架快速生成一个web应用。项目结构如下图所示：
在 pom.xml添加如下依赖

<dependency>
 <groupId>org.springframeworkgroupId>
 <artifactId>spring-webmvcartifactId>
 <version>5.1.7.RELEASEversion>
dependency>

<dependency>
 <groupId>com.fasterxml.jackson.coregroupId>
 <artifactId>jackson-databindartifactId>
 <version>2.9.9version>
dependency>
<dependency>
 <groupId>com.fasterxml.jackson.dataformatgroupId>
 <artifactId>jackson-dataformat-xmlartifactId>
 <version>2.9.9version>
dependency>

<dependency>
 <groupId>org.springframeworkgroupId>
 <artifactId>spring-jdbcartifactId>
 <version>5.1.7.RELEASEversion>
dependency>
<dependency>
 <groupId>org.mybatisgroupId>
 <artifactId>mybatisartifactId>
 <version>3.5.1version>
dependency>
<dependency>
 <groupId>org.mybatisgroupId>
 <artifactId>mybatis-springartifactId>
 <version>2.0.1version>
dependency>
<dependency>
 <groupId>mysqlgroupId>
 <artifactId>mysql-connector-javaartifactId>
 <version>5.1.47version>
dependency>


<dependency>
 <groupId>org.springframeworkgroupId>
 <artifactId>spring-aopartifactId>
 <version>5.1.7.RELEASEversion>
dependency>
<dependency>
 <groupId>org.aspectjgroupId>
 <artifactId>aspectjweaverartifactId>
 <version>1.9.4version>
dependency>


<dependency>
 <groupId>commons-fileuploadgroupId>
 <artifactId>commons-fileuploadartifactId>
 <version>1.4version>
dependency>


<dependency>
 <groupId>org.slf4jgroupId>
 <artifactId>slf4j-apiartifactId>
 <version>1.7.26version>
dependency>
<dependency>
 <groupId>org.slf4jgroupId>
 <artifactId>slf4j-log4j12artifactId>
 <version>1.7.25version>
dependency>
<dependency>
 <groupId>log4jgroupId>
 <artifactId>log4jartifactId>
 <version>1.2.17version>
dependency>


<dependency>
 <groupId>org.springframeworkgroupId>
 <artifactId>spring-testartifactId>
 <version>5.1.7.RELEASEversion>
 <scope>testscope>
dependency>
<dependency>
 <groupId>junitgroupId>
 <artifactId>junitartifactId>
 <version>4.12version>
 <scope>testscope>
dependency>

配置web.xml配置信息

<context-param>
   <param-name>contextConfigLocationparam-name>
   <param-value>classpath*:applicationContext.xmlparam-value>
 context-param>
 <filter>
   <filter-name>encodefilter-name>
   <filter-class>org.springframework.web.filter.CharacterEncodingFilterfilter-class>
   <init-param>
     <param-name>encodingparam-name>
     <param-value>utf-8param-value>
   init-param>
 filter>
 <filter-mapping>
   <filter-name>encodefilter-name>
   <url-pattern>/*url-pattern>
 filter-mapping>

 <listener>
   <listener-class>org.springframework.web.context.ContextLoaderListenerlistener-class>
 listener>

 <servlet>
   <servlet-name>mvcservlet-name>
   <servlet-class>org.springframework.web.servlet.DispatcherServletservlet-class>
   <load-on-startup>0load-on-startup>
 servlet>
 <servlet-mapping>
   <servlet-name>mvcservlet-name>
   <url-pattern>/url-pattern>
 servlet-mapping>

配置applicationContext.xml

<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 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/tx http://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/aop https://www.springframework.org/schema/aop/spring-aop.xsd">

    
    <bean id="placeholderConfigurerSupport" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
        <property name="location" value="classpath:jdbc.properties">property>
    bean>
    
    <bean id="dataSource" class="org.apache.ibatis.datasource.unpooled.UnpooledDataSource">
        <property name="driver" value="${jdbc.driver}"/>
        <property name="url" value="${jdbc.url}"/>
        <property name="username" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>
    bean>
    
    <bean id="sessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        
        <property name="dataSource" ref="dataSource"/>
        
        <property name="typeAliasesPackage" value="com.jiangzz.entities"/>
        
        <property name="mapperLocations" value="classpath*:/mappers/*xml"/>
    bean>
    
    <bean  class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="sqlSessionFactoryBeanName" value="sessionFactory"/>
        <property name="basePackage" value="com.jiangzz.dao"/>
    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="query*" propagation="SUPPORTS" isolation="READ_COMMITTED" read-only="true"/>
            <tx:method name="save*" propagation="REQUIRED" isolation="READ_COMMITTED" />
            <tx:method name="*" propagation="SUPPORTS" isolation="READ_COMMITTED" />
        tx:attributes>
    tx:advice>
    
    <aop:config >
        <aop:pointcut id="pc" expression="execution(* com.jiangzz.service..*.*(..))"/>
        <aop:advisor advice-ref="txAdvice" pointcut-ref="pc"/>
    aop:config>
    
    <bean id="userService" class="com.jiangzz.service.impl.UserService" >
    	
        <property name="userDAO" ref="IUserDAO"/>
    bean>
beans>

配置jdbc.properties

jdbc.url=jdbc:mysql://192.168.38.129:3306/security?useUnicode=true&characterEncoding=utf8
jdbc.driver=com.mysql.jdbc.Driver
jdbc.username=root
jdbc.password=root

配置log4j.properties

### set log levels ###
log4j.rootLogger = FATAL,stdout 

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 =  %p %c - %m%n

log4j.logger.com.jiangzz.dao=trace
log4j.logger.org.springframework.jdbc.datasource=debug

创建Mapper

在resource目录下创建mappres文件夹

<mapper namespace="com.jiangzz.dao.IUserDAO">
    <insert id="insert" parameterType="User" useGeneratedKeys="true"  keyProperty="id">
        insert into t_user(name,password,age,sex,birthDay)values(#{name},#{password},#{age},#{sex},#{birthDay})
    insert>
    <select id="qureyUserById" resultType="User">
        select id,name,password,sex,age,birthDay from t_user where id=#{id}
    select>
mapper>

创建mvc-servlet.xml

在WEB-INF下创建mvc-servlet.xml该文件是web mvc配置文件

<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:mvc="http://www.springframework.org/schema/mvc"
       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/mvc https://www.springframework.org/schema/mvc/spring-mvc.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd">

    
    <context:component-scan base-package="com.jiangzz.controller"/>

    
    <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/"/>
        <property name="suffix" value=".jsp"/>
    bean>
    
    <mvc:annotation-driven />
    
    <mvc:resources mapping="/**" location="/"/>
    
    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <property name="maxUploadSize" value="1024000"/>
        <property name="uploadTempDir" value="/tmpUpload"/>
    bean>
beans>

DAO接口

package com.jiangzz.dao;

import com.jiangzz.entities.User;

public interface IUserDAO {
    public void insert(User user);
    public User qureyUserById(Integer id);
}

Service接口

package com.jiangzz.service;

import com.jiangzz.entities.User;

public interface IUserService {
    public void saveUser(User user);
    public User queryUserById(Integer id);
}

service接口实现

package com.jiangzz.service.impl;

import com.jiangzz.dao.IUserDAO;
import com.jiangzz.entities.User;
import com.jiangzz.service.IUserService;

public class UserService implements IUserService {
    private IUserDAO userDAO;
    @Override
    public void saveUser(User user) {
        userDAO.insert(user);
    }

    @Override
    public User queryUserById(Integer id) {
        return userDAO.qureyUserById(id);
    }

    public IUserDAO getUserDAO() {
        return userDAO;
    }

    public void setUserDAO(IUserDAO userDAO) {
        this.userDAO = userDAO;
    }
}

更多细节

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