使用spring 配置数据源，并用数据源得到连接，操作sql

需要的jar包：

spring-2.5.jar ojdbc14.jar commons-pool-1.3.jar commons-dbcp-1.4.jar

sys.properties文件：

jdbc.driverClassName=oracle.jdbc.driver.OracleDriver

jdbc.url=jdbc:oracle:thin:@localhost:1521:orcl

jdbc.username=scott

jdbc.password=tiger

app.xml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:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.0.xsd" default-autowire="byName" default-lazy-init="true">

<!-- 属性文件读入 -->
<bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="locations">
<list>
<value>classpath*:conff/sys.properties</value>
</list>
</property>
</bean>
<!--
<bean id="mydataSource" class="org.apache.commons.dbcp.BasicDataSource">
<property name="driverClassName" value="oracle.jdbc.driver.OracleDriver"></property>
<property name="url"
value="jdbc:oracle:thin:@localhost:1521:ORCL">
</property>
<property name="username" value="scott"></property>
<property name="password" value="tiger"></property>
</bean>
-->
<!--  -->
<bean id="mydataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
<property name="driverClassName"><value>${jdbc.driverClassName}</value></property>
<property name="url"><value>${jdbc.url}</value></property>
<property name="username"><value>${jdbc.username}</value></property>
<property name="password"><value>${jdbc.password}</value></property>
</bean>

<bean id="myJdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
<property name="dataSource">
<ref bean="mydataSource"/>
</property>
</bean>

</beans>

Ora2.java文件：

package oracletest;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

import javax.sql.DataSource;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.jdbc.datasource.DataSourceUtils;

public class Ora2 {

private DataSource dataSource;
private static ApplicationContext applicationContext;
private String[] xmlClassPath={
"conff/app.xml"
};

public Ora2(){
applicationContext=new ClassPathXmlApplicationContext(xmlClassPath);
}
public static Object getBean(String beanName){

return  applicationContext.getBean(beanName);
}

public DataSource getDataSource() {
return dataSource;
}
public void setDataSource(DataSource dataSource) {
this.dataSource = dataSource;
}
@SuppressWarnings("rawtypes")
public static void main(String[] args) {
Ora2 dd=new Ora2();
dd.setDataSource((DataSource)dd.getBean("mydataSource"));
//如果用数据源获取Connection对象，则要用到DataSourceUtils
Connection con=DataSourceUtils.getConnection(dd.getDataSource());
try {
Statement stmt=con.createStatement();
String sql="select pass,dd  from t1 where pass='vv'";
ResultSet res=stmt.executeQuery(sql);

//遍历结果集
while(res.next()){
System.out.println(res.getString("PASS")+"---"+res.getString("DD"));
}

//关闭连接
if((con!=null)||(!con.isClosed())){
con.close();
con=null;
}
if((stmt!=null)||(!stmt.isClosed())){
stmt.close();
stmt=null;
}

} catch (SQLException e) {
e.printStackTrace();
}

}

}

//输出结果：

- Refreshing
org.springframework.context.support.ClassPathXmlApplicationContext@3e86d0: display name [org.springframework.context.support.ClassPathXmlApplicationContext@3e86d0]; startup date [Tue Oct 18 11:04:30 CST 2011]; root of context hierarchy

- Loading XML bean definitions from class path resource [conff/app.xml]

- Bean factory for application context [org.springframework.context.support.ClassPathXmlApplicationContext@3e86d0]:

org.springframework.beans.factory.support.DefaultListableBeanFactory@191d8c1

- Loading properties file from URL [file:/D:/work/des/bin/conff/sys.properties]

- Pre-instantiating singletons in
org.springframework.beans.factory.support.DefaultListableBeanFactory@191d8c1: defining beans [propertyConfigurer,mydataSource,myJdbcTemplate]; root of factory hierarchy

vv---2011-10-10 16:48:39.0

vv---null