將外部屬性文件的數(shù)據(jù)配置到bean的配置文件，依賴于context標(biāo)簽下的property-placeholder標(biāo)簽

1、準(zhǔn)備properties文件

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

2、編寫對應(yīng)實(shí)體類

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='http://www.springframework.org/schema/beans' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xmlns:context='http://www.springframework.org/schema/context' xsi:schemaLocation='http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd'> <!--導(dǎo)入配置文件--> <context:property-placeholder location='classpath:db.properties'></context:property-placeholder> <!--DataSource--> <bean 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、測試

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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