spring 引入外部配置文件propertice

spring 引入外部配置文件propertice

引用外部配置文件是为了更好的阅读与维护 在这里只讲述context方法引入外部配置文件

1、spring.xml的配置

<?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:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx" 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">

2、配置校验文件 3、db.propertice文件内容

jdbc.driverClassName=oracle.jdbc.driver.OracleDriver jdbc.url=jdbc:oracle:thin:@localhost:1521:orcl jdbc.username=mybatis jdbc.password=a

4、引入外部的Properties属性文件

<context:property-placeholder location="classpath:db.properties" />

5、spring配置数据源

<!-- ${xxxx}:表示动态引用外部的配置文件 --> <bean id="dataSource" class="org.apache.commons.dbcp2.BasicDataSource"> <property name="driverClassName" value="${jdbc.driverClassName}" /> <property name="url" value="${jdbc.url}" /> <property name="username" value="${jdbc.username}" /> <property name="password" value="${jdbc.password}" /> </bean>

6、测试 pom.xml中引用Junit包

<dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.12</version> <scope>test</scope> </dependency>

测试类:

import static org.junit.Assert.*; import java.sql.Connection; import java.sql.SQLException; import javax.sql.DataSource; import org.junit.Test; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; public class test { @Test public void testConn() { ApplicationContext ac=new ClassPathXmlApplicationContext("spring2.xml"); DataSource d=(DataSource) ac.getBean("dataSource"); try { Connection con=d.getConnection(); System.out.println(con); assertNotNull(con); } catch (SQLException e) { e.printStackTrace(); } } }

返回结果输出,并且Junit结果显示正确:

25927067, URL=jdbc:oracle:thin:@localhost:1521:orcl, UserName=MYBATIS, Oracle JDBC driver

如果需要引入多个配置文件

<!-- 通过context:property-placeholde加载多个配置文件 只需在第1.2步中将多个配置文件以逗号分隔即可 <context:property-placeholder location="classpath:jdbc.properties,classpath:XXX.properties"/> -->

配置数据源时也可采用这种方式

<property name="password"> <value>${jdbc.password}</value> </property>