JDBC连接MySQL或Oracle数据库(通过从属性文件jdbc.properties读，用Java的Property类)

JDBCTest.java 源代码如下：

package com.jdbc.entity;

import java.io.InputStream;
import java.sql.Connection;
import java.sql.Date;
import java.sql.Driver;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.List;
import java.util.Properties;

import org.junit.Test;

public class JDBCTest {
	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");
		
		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;
	}
	
	@Test
	public void testGetConnection() throws Exception{
		System.out.println(getConnection());
	}

}

jdbc.properties代码如下：

#driver=oracle.jdbc.driver.OracleDriver
#jdbcUrl=jdbc:oracle:thin:@localhost:1521:orcl
#user=wuxin
#password=wuxin
driver=com.mysql.jdbc.Driver
jdbcUrl=jdbc:mysql://localhost:3306/hibernate
user=root
password=123456