通过使用集合Properties完成JDBC的连接工具类

1.将数据库连接对象所需参数保存在本地文件中

database.properties  

driverClass=com.mysql.jdbc.Driver
url=jdbc:mysql://localhost:3306/mybase
username=root
password=123456

2.编写数据库连接工具类

package jdbcutil;

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

public class JDBCUtilsConfig {
    private  static Connection con;
    private static String driverClass;
    private static String url;
    private static String username;
    private static String password;
    
    
    static{
        try{
        readConfig();
        Class.forName(driverClass);
        con=DriverManager.getConnection(url,username,password);
        
    }catch (Exception e){
        throw new RuntimeException("数据库连接失败");
    }
    }
    private static void readConfig()throws Exception{
        InputStream in=JDBCUtilsConfig.class.getResourceAsStream("database.properties");
        Properties pro=new Properties();
        pro.load(in);
        driverClass=pro.getProperty("driverClass");
        url=pro.getProperty("url");
        username=pro.getProperty("username");
        password=pro.getProperty("password");
    }
    public static Connection getConnection(){
        return con;
    }
}