package cn.liz.test;import java.io.InputStream;
import java.sql.Connection;
import java.sql.Driver;
import java.sql.SQLException;
import java.util.Properties;import org.junit.Test;public class JBDCtest {/*** 编写一个通用的方法, 在不改动源程序的情况下, 能够获取不论什么数据库的连接* 解决方式: 把数据库驱动 Driver 实现类的全类名、url、user、password 放入一个* 配置文件里, 通过改动配置文件的方式实现和详细的数据库解耦. * @throws Exception */public  Connection getConnection() throws Exception{String driverClass = null;String jdbcUrl = null;String user = null;String password = null;//读取类路径下的 jdbc.properties 文件InputStream in = getClass().getClassLoader().getResourceAsStream("jdbc.properties");Properties properties = new Properties();properties.load(in);driverClass = properties.getProperty("driver");jdbcUrl = properties.getProperty("jdbcUrl");user = properties.getProperty("user");password = properties.getProperty("password");//通过反射常见 Driver 对象. Driver driver = (Driver) Class.forName(driverClass).newInstance();Properties info = new Properties();info.put("user", user);info.put("password", password);//通过 Driver 的 connect 方法获取数据库连接. Connection connection = driver.connect(jdbcUrl, info);return connection;}@Testpublic void testGetConnection() throws Exception{System.out.println(getConnection());}
}<span style="white-space:pre">        </span>

<span style="font-family: Arial, Helvetica, sans-serif;">jdbc.properties</span>配置文件：

#driver=oracle.jdbc.driver.OracleDriver
#jdbcUrl=jdbc:oracle:thin:@localhost:1521:orcl
#user=scott
#password=javadriver=com.mysql.jdbc.Driver
jdbcUrl=jdbc:mysql://localhost:3306/test
user=root
password=