spring 加載properties檔案（裝配bean 四）

加載properties檔案

注解配置方式

test.properties檔案

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/heheda
jdbc.username=root
jdbc.password=root

           

配置檔案掃描

@PropertySource(value = { "classpath:test.properties" }, ignoreResourceNotFound = true)
public class ApplicationConfig2 {

}

           

測試

ApplicationContext context = new AnnotationConfigApplicationContext(ApplicationConfig2.class);
		String driver = context.getEnvironment().getProperty("jdbc.driver");
		System.out.println(driver);
           

測試成功

注解配置方式，占位符

配置注解ioc入口

@Configuration
@PropertySource(value = { "classpath:test.properties" }, ignoreResourceNotFound = true)
@ComponentScan(basePackages = { "priv.dengjl.spring.day2.bean" })
public class ApplicationConfig2 {

	@Bean
	public PropertySourcesPlaceholderConfigurer PropertySourcesPlaceholderConfigurer() {
		return new PropertySourcesPlaceholderConfigurer();
	}
}
           

占位符檔案

@Component
public class DataSource {
	
	@Value("${jdbc.url}")
	private String url;
	@Value("${jdbc.password}")
	private String password;
	
	@Override
	public String toString() {
		return "DataSource [url=" + url + ", password=" + password + "]";
	}
}
           

測試

ApplicationContext context = new AnnotationConfigApplicationContext(ApplicationConfig2.class);
		String driver = context.getEnvironment().getProperty("jdbc.driver");
		System.out.println(driver);
		DataSource bean = context.getBean(DataSource.class);
		System.out.println(bean);
           

測試通過

xml配置方式

xml配置

<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:context="http://www.springframework.org/schema/context"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
    http://www.springframework.org/schema/context
    http://www.springframework.org/schema/context/spring-context-3.0.xsd">

	<context:component-scan base-package="priv.dengjl.spring.day2.bean" />
	<context:property-placeholder location="classpath:test.properties" ignore-resource-not-found="true" />

	<bean class="org.springframework.context.support.PropertySourcesPlaceholderConfigurer">
	
	</bean>
</beans>

           

測試

ApplicationContext context = new ClassPathXmlApplicationContext("Property.xml");
		DataSource dataSource = (DataSource) context.getBean("dataSource");
		System.out.println(dataSource);
           

測試通過