Spring实战——属性覆盖占位符配置器

曾经终败给现在 2021-07-24 23:18 370阅读 0赞

**一 配置文件**

<?xml version="1.0" encoding="GBK"?>
    <beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xmlns="http://www.springframework.org/schema/beans"
         xsi:schemaLocation="http://www.springframework.org/schema/beans
         http://www.springframework.org/schema/beans/spring-beans-4.0.xsd">
         
         <bean class=
         "org.springframework.beans.factory.config.PropertyOverrideConfigurer">
               <property name="locations">
                    <list>
                         <value>dbconn.properties</value>
                         
                    </list>
               </property>
         </bean>
         
         <bean id="dataSource"  class="com.mchange.v2.c3p0.ComboPooledDataSource"
               destroy-method="close"/>
    </beans>

**二 属性文件**

dataSource.driverClass=com.mysql.jdbc.Driver
    dataSource.jdbcUrl=jdbc:mysql://localhost:3306/spring
    dataSource.user=root
    dataSource.password=32147

**三 测试类**

package lee;
    
    
    import javax.sql.DataSource;
    import java.sql.*;
    
    
    import org.springframework.context.*;
    import org.springframework.context.support.*;
    
    public class BeanTest
    {
        public static void main(String[] args)throws Exception
        {
            ApplicationContext ctx = new
                ClassPathXmlApplicationContext("beans.xml");
            DataSource ds = (DataSource)ctx.getBean("dataSource");
            Connection conn = ds.getConnection();
            PreparedStatement pstmt = conn.prepareStatement(
                "insert into news_inf value(null , ? , ?)");
            pstmt.setString(1 , "疯狂Java讲义3");
            pstmt.setString(2 , "疯狂iOS讲义3");
            pstmt.executeUpdate();
            pstmt.close();
            conn.close();
        }
    }

**四 测试结果**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70][]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70]: /images/20210724/5a372f97a4dc49128c132a7b3fa7b1df.png