Spring如何实现properties配置文件的自动导入示例？

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将外部属性文件的数据配置到bean的配置文件中，依赖于context标签下的property-placeholder标签，以及准备properties文件：

1.URL=jdbc:mysql://localhost:3306/hibernate_db

2.用户名=root

3.密码=1111

4.编写对应实体类

将外部属性文件的数据配置到bean的配置文件，依赖于context标签下的property-placeholder标签

1、准备properties文件

url=jdbc:mysql://localhost:3306/hibernate_db
username=root
password=1111

2、编写对应实体类

package com.yl.bean; public class DataSource { private String url; private String username; private String password; public DataSource() { } public String getUrl() { return url; } public void setUrl(String url) { this.url = url; } public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } @Override public String toString() { return "DataSource{" + "url='" + url + '\'' + ", username='" + username + '\'' + ", password='" + password + '\'' + '}'; } }

3、spring配置文件

<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="www.springframework.org/schema/beans" xmlns:xsi="www.w3.org/2001/XMLSchema-instance" xmlns:context="www.springframework.org/schema/context" xsi:schemaLocation="www.springframework.org/schema/beans www.springframework.org/schema/beans/spring-beans.xsd www.springframework.org/schema/context www.springframework.org/schema/context/spring-context.xsd"> <!--导入配置文件--> <context:property-placeholder location="classpath:db.properties"></context:property-placeholder> <!--DataSource--> <bean id="dataSource" class="com.yl.bean.DataSource"> <property name="password" value="${password}"></property> <property name="username" value="${username}"></property> <property name="url" value="${url}"></property> </bean> </beans>

4、测试

package com.yl; import com.yl.bean.DataSource; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; public class MainTest { public static void main(String[] args) { ApplicationContext applicationContext=new ClassPathXmlApplicationContext("bean1.xml"); DataSource dataSource= (DataSource) applicationContext.getBean("dataSource"); System.out.println(dataSource); } }

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