springboot(7)@Configuration

超、凢脫俗 2022-06-01 06:22 155阅读 0赞

## 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 ##

@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>

## 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。