jdbc最简单的Connection工具类

package org.day01;

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

public class ConnectionUtils {
  private static String driver;

  private static String url;

  private static String user;

  private static String password;

  static {
    try {
      Properties props = new Properties();
      // 从类路径下加载属性文件
      InputStream is = ConnectionUtils.class.getClassLoader()
          .getResourceAsStream("db.properties");
      props.load(is);

      driver = props.getProperty("driver");
      url = props.getProperty("url");
      user = props.getProperty("user");
      password = props.getProperty("password");

      Class.forName(driver);

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

  public static Connection getConnection() throws SQLException {
    return DriverManager.getConnection(url, user, password);
  }
}