spring 数据库

<?xml version="1.0" encoding="UTF-8"?>
<beans default-autowire="byName" xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xmlns:mvc="http://www.springframework.org/schema/mvc" xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd">

   <context:component-scan base-package="com.liyang"/>  

    <bean id="dataSource" class="org.apache.commons.dbcp2.BasicDataSource" destroy-method="close">
        <property name="driverClassName" value="com.mysql.jdbc.Driver">
        </property>
        <property name="url" value="jdbc:mysql://X.X.X.X:X/dbname">
        </property>
        <property name="username" value="XX"></property>
        <property name="password" value="XX"></property>
        <property name="maxIdle" value="50"></property>
        <property name="minIdle" value="10"></property>
    </bean>

</beans>

package com.liyang;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

import javax.sql.DataSource;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.stereotype.Service;


@Service
public class Main {


        @Autowired
        public  static DataSource dataSource  ;


        public static void main(String[] args) {
            String[] configLocations = { 
            "applicationContext-resource.xml" };

            ApplicationContext context = new ClassPathXmlApplicationContext(configLocations);

            dataSource = (DataSource)context.getBean("dataSource")  ;


            Connection connection = null;
            PreparedStatement ps = null;
            try {
                connection = dataSource.getConnection();
                ps = getPreparedStatement(connection, "select * from XXX" , null) ;
                ResultSet res = ps.executeQuery()  ;
                while(res.next()){
                      System.out.print(res.getDate(1) + " ") ;
                      System.out.print(res.getString(2) + " ") ;
                      System.out.println(res.getString(3)) ;
                }
                ps.close() ;
                ps = null ;
                connection.close() ;
                connection = null ;
            } catch (Exception e) {
                 System.out.println("ero1") ;
            } finally {
                if (ps != null)
                    try {
                        ps.close();
                    } catch (SQLException e) {
                         System.out.println("ero2") ;
                    }
                if (connection != null)
                    try {
                        connection.close();
                    } catch (SQLException e) {
                         System.out.println("ero3") ;
                    }
            }

       }

        private static PreparedStatement getPreparedStatement(Connection connection,
                String sql, Object... values) throws SQLException {
            PreparedStatement ps = connection.prepareStatement(sql);
            if (values != null) {
                for (int i = 1; i <= values.length; i++) {
                    ps.setObject(i, values[i - 1]);
                }
            }
            return ps;
        } 

}