1：

package com.jdbc;


import static org.junit.Assert.*;


import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.util.Properties;


import org.junit.Test;


public class ReviewTest {
   
@Test
public void testGetConnection() throws ClassNotFoundException, SQLException {
String driverClass="com.mysql.jdbc.Driver";
String jdbcUrl="jdbc:mysql://localhost:3306/mydatabase";
String user="root";
String password="123456";
Class.forName(driverClass);
Connection connection=DriverManager.getConnection(jdbcUrl,user,password);
   System.out.println(connection);
}
@Test
public void testGetConnection2() throws ClassNotFoundException, SQLException, IOException {
//讀取配置檔案jdbc.properties,是在bin目錄下，類載入器會自動掃描類路徑的檔案，通過讀取Properties類的屬性
Properties properties=new Properties();
InputStream inStream=ReviewTest.class.getClassLoader().getResourceAsStream("jdbc.properties");
properties.load(inStream);
String driverClass=properties.getProperty("driverClass");
String jdbcUrl=properties.getProperty("jdbcUrl");
String user=properties.getProperty("user");
String password=properties.getProperty("password");
Class.forName(driverClass);
Connection connection=DriverManager.getConnection(jdbcUrl,user,password);
   System.out.println(connection);
}
}

  2：

driverClass=com.mysql.jdbc.Driver
jdbcUrl=jdbc:mysql://localhost:3306/mydatabase
user=root
password=123456