在xml文件中引入带有@Configuration的Java类

在xml引入带有@Configuration的Java类，就是把这个带有@Configuration的Java类，当做一个普通的的类用<bean>标签引入：

核心代码如下：

@Configuration
public class AppConfig {
@Autowired
private DataSource dataSource;
@Bean
public AccountRepository accountRepository() {
return new JdbcAccountRepository(dataSource);
}
@Bean
public TransferService transferService() {
return new TransferService(accountRepository());
}
}

<beans>
<!-- enable processing of annotations such as @Autowired and @Configuration -->
<!--这个必须要带否则会报错-->
<context:annotation-config/>
<context:property-placeholder location="classpath:/com/acme/jdbc.properties"/>
<!--引入带有@Configuration的Java类-->
<bean class="com.acme.AppConfig"/>
<bean class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="url" value="${jdbc.url}"/>
<property name="username" value="${jdbc.username}"/>
<property name="password" value="${jdbc.password}"/>
</bean>
</beans>