springboot(7)@Configuration

1、定义

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

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@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

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

}

spring-mybatis.xml :

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<?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&amp;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>

4、总结

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。