springboot(7)@Configuration

springboot推荐使用用java代码的形式申明注册bean。
@Configuration注解可以用java代码的形式实现spring中xml配置文件配置的效果。

2、通过java代码注册bean

@Configuration
public class TestMybaitsConf {

@Bean
	public DataSource dataSource() {
		ComboPooledDataSource dataSource = new ComboPooledDataSource();
		try {
			dataSource.setDriverClass("com.mysql.jdbc.Driver");
			dataSource.setJdbcUrl("jdbc:mysql://192.168.100.25:6660/TXSMS?useUnicode=true&characterEncoding=utf-8");
			dataSource.setUser("root");
			dataSource.setPassword("123456");
		} catch (Exception e) {
			throw new RuntimeException(e);
		}
		return dataSource;
	}

@Bean
	public SqlSessionFactory sqlSessionFactory(DataSource dataSource) {
		SqlSessionFactory factory = null;
		SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
		bean.setDataSource(dataSource);
		ResourcePatternResolver resolver = new PathMatchingResourcePatternResolver();
		bean.setConfigLocation(resolver.getResource("classpath:mybatis.xml"));
		try {
			factory = bean.getObject();
		} catch (Exception e) {
			throw new RuntimeException(e);
		}
		return factory;
	}

@Bean
	public SqlSessionTemplate sqlSessionTemplate(SqlSessionFactory sqlSessionFactory) {
		return new SqlSessionTemplate(sqlSessionFactory);
	}

@Bean
	public PlatformTransactionManager transactionManager(DataSource dataSource) {
		return new DataSourceTransactionManager(dataSource);
	}
}

3、使用xml注册bean

@Configuration
@ImportResource("classpath:spring-mybatis.xml")
public class TestMybaitsConf {

}

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:mvc="http://www.springframework.org/schema/mvc" xmlns:tx="http://www.springframework.org/schema/tx"
	xmlns:jee="http://www.springframework.org/schema/jee" xmlns:aop="http://www.springframework.org/schema/aop"
	xsi:schemaLocation="http://www.springframework.org/schema/mvc  http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd
		http://www.springframework.org/schema/jee  http://www.springframework.org/schema/jee/spring-jee-4.0.xsd
		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/tx  http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
		http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd">

<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
		<property name="driverClass" value="com.mysql.jdbc.Driver"></property>
		<property name="jdbcUrl" value="jdbc:mysql://192.168.100.25:6660/TXSMS?useUnicode=true&characterEncoding=utf-8"></property>
		<property name="user" value="root"></property>
		<property name="password" value="123456"></property>
	</bean>

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

<bean id="sqlSessionTemplate" class="org.mybatis.spring.SqlSessionTemplate">
		<constructor-arg index="0" ref="sqlSessionFactory"></constructor-arg>
	</bean>

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

<tx:annotation-driven transaction-manager="transactionManager"/>
</beans>

2、3两种注册bean的效果完全一样，但springboot推荐使用2中的方式，使用java代码注册bean。