Spring+SpringMVC+MyBatis+Maven框架整合

本文记录了Spring+SpringMVC+MyBatis+Maven框架整合的记录，主要记录以下几点 
一、Maven需要引入的jar包 
二、Spring与SpringMVC的配置分离 
三、Spring与MyBatis的整合 

一、Maven需要引入的jar包 
本文默认读者已经掌握Maven的使用，Maven配置片段如下 

Xml代码  

<dependency>
    <groupId>org.springframeworkgroupId>
    <artifactId>spring-webmvcartifactId>
    <version>${springframework.version}version>
dependency>
<dependency>
    <groupId>org.springframeworkgroupId>
    <artifactId>spring-jdbcartifactId>
    <version>${springframework.version}version>
dependency>

<dependency>
    <groupId>org.mybatisgroupId>
    <artifactId>mybatisartifactId>
    <version>${mybatis.version}version>
dependency>
<dependency>
    <groupId>org.mybatisgroupId>
    <artifactId>mybatis-springartifactId>
    <version>${mybatis-spring.version}version>
dependency>

<dependency>
    <groupId>com.oraclegroupId>
    <artifactId>ojdbc14artifactId>
    <version>${oracle14.version}version>
dependency>

<dependency>
    <groupId>c3p0groupId>
    <artifactId>c3p0artifactId>
    <version>${c3p0.version}version>
dependency>

二、Spring与SpringMVC的配置分离 

1、有必要说明一下，web.xml中配置的执行顺序： 
listener>filter>servlet，而同一种配置片段则按照从上到下的顺序执行。 
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2、web.xml的配置片段，下面的配置信息将Spring与SpringMVC的配置分别放到了applicationContext*.xml和springmvc-servlet.xml 

Xml代码  

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



<context-param>
    <param-name>contextConfigLocationparam-name>
    <param-value>classpath*:applicationContext*.xmlparam-value>
context-param>


<servlet>
    <servlet-name>springmvcservlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServletservlet-class>

    <init-param>
        <param-name>contextConfigLocationparam-name>
        <param-value>classpath:springmvc-servlet.xmlparam-value>
    init-param>
servlet>
<servlet-mapping>
    <servlet-name>springmvcservlet-name>
    <url-pattern>*.dourl-pattern>
servlet-mapping>


<filter>
    <filter-name>encodingFilterfilter-name>
    <filter-class>org.springframework.web.filter.CharacterEncodingFilterfilter-class>
    <init-param>
        <param-name>encodingparam-name>
        <param-value>utf-8param-value>
    init-param>
    <init-param>
        <param-name>forceEncodingparam-name>
        <param-value>trueparam-value>
    init-param>
filter>
<filter-mapping>
    <filter-name>encodingFilterfilter-name>
    <url-pattern>/*url-pattern>
filter-mapping>

3、springmvc的配置片段如下，springmvc-servlet.xml 

Xml代码  

<context:component-scan base-package="org.jisonami.controller">
    <context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
context:component-scan>

<bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver"
p:prefix="/WEB-INF/content/" p:suffix=".jsp">
bean>

4、目前本例中只是用了一个spring配置文件，即applicationContext.xml，如下： 
 

Xml代码  

<context:component-scan base-package="org.jisonami">
    <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
context:component-scan>

5、关于spring配置文件中的xml头部： 

Xml代码  

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"
    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">

6、此时已经可以在代码中使用注解来配置spring的bean了，即如下形式的代码完成依赖注入： 

Java代码  

@Autowired
private UserService userService;

三、Spring与MyBatis的整合 
1、MyBatis的使用主要是使用Mapper接口+Mapper.xml中写sql的方式来实现更灵活的dao层，这一部分在与spring整合之后是不变的 
而mybatis的全局配置文件则是SqlMapConfig.xml，也可以是其它的名字。 

2、整合之前，数据库的连接信息是在SqlMapConfig.xml中配置的，并且Mapper的扫描也是在SqlMapConfig.xml中配置的 
最麻烦的是我们完成crud操作的代码有比较多的冗余，即如下所示的形式： 

Java代码  

// 完成一个新增操作
InputStream is = Resources.getResourceAsStream("SqlMapConfig.xml");
SqlSessionFactory sessionFactory = new SqlSessionFactoryBuilder().build(is);
SqlSession session = sessionFactory.openSession();
UserMapper userMapper = session.getMapper(UserMapper.class);
userMapper.save(user);
session.commit();
session.close();

3、与spring整合的目的则是将SqlSessionFactory、SqlSession、UserMapper的创建和SqlSession的事物提交与关闭交给spring容器进行管理， 
实现只需要调用一行代码的效果，即 

Java代码  

userMapper.save(user);

4、整合之后，数据库的连接信息与Mapper的扫描的配置片段直接移到applicationContext.xml中去了，完成SqlSessionFactory、SqlSession、UserMapper注入 
applicationContext.xml中mybatis的配置片段： 

Xml代码  

<context:property-placeholder location="classpath:DBConfig.properties"/>

<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close">
    <property name="driverClass" value="${jdbc.driver}">property>
    <property name="jdbcUrl" value="${jdbc.url}">property>
    <property name="user" value="${jdbc.user}">property>
    <property name="password" value="${jdbc.pass}">property>
bean>

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

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

5、原来的SqlMapConfig.xml文件中只剩下寥寥几行配置信息， 

Xml代码  

<configuration>

    <typeAliases>
        <package name="org.jisonami.entity"/>
    typeAliases>
configuration>

6、以UserMapper.xml配置片段为例，描述整合后的简洁编程方式 

Xml代码  

<mapper namespace="org.jisonami.mybatis.mapper.UserMapper">


    <insert id="save" parameterType="User">
        <selectKey keyColumn="id" keyProperty="id" resultType="String" order="BEFORE">
            select sys_guid() from dual
        selectKey>
        insert into t_user(id, name, password) values(#{id}, #{name}, #{password})
    insert>
mapper>

UserMapper接口中的方法声明如下： 

Java代码  

public interface UserMapper {
    public void save(User user);
}

调用部分代码，直接注入UserMapper 

Java代码  

@Autowired
private UserMapper userMapper;
public void save(User user) {
    userMapper.save(user);
}