mysql之通過設(shè)置文件鏈接數(shù)據(jù)庫的示例詳細(xì)說明

mysql 之通過配置文件鏈接數(shù)據(jù)庫

配置文件jdbc.properties

##MySQL
driver=com.mysql.jdbc.Driver
url=jdbc\:mysql\:///ake?useUnicode\=true&characterEncoding\=UTF-8
username=root
password=1234

##Oracle
#driver=oracle.jdbc.driver.OracleDriver
#url=jdbc:oracle:thin:@127.0.0.1:1521:orcl
#username=scott
#password=tiger

簡(jiǎn)單的講一下。配置文件寫了MySQL和Oracle的數(shù)據(jù)庫信息，我的數(shù)據(jù)庫是mysql 所以我把oracle的配置信息注釋掉了。

接下來就是一個(gè)單例（餓漢式）的獲得數(shù)據(jù)庫連接方法工具類

package Studying.d15;

import java.io.FileInputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.util.Properties;

public class ConnUtils {
  private static Connection con = null;

  static{
    try {
      Properties p = new Properties();
      p.load( new FileInputStream("jdbc.properties") );
      String driver = p.getProperty("driver");
      String url = p.getProperty("url");
      String username = p.getProperty("username");
      String password = p.getProperty("password");
      System.out.println(url+","+driver);
      Class.forName(driver);
      con = DriverManager.getConnection(url, username, password);
    } catch (Exception e) {
      e.printStackTrace();
    }
  }
  public static Connection getConnection(){
    return con;
  }
}

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