JDBC跨平台封装工具类

import java.io.IOException;
import java.io.InputStream;
import java.sql.*;
import java.util.Properties;
public class DBUtils {
    private static final Properties PROPERTIES=new Properties();//储存配置文件内容价值的properitues集合
    static {
        InputStream is=DBUtils.class.getResourceAsStream("/db.properties");
        try {
            PROPERTIES.load(is);//通过流，将配置文件内容加载到propertuies集合
            Class.forName(PROPERTIES.getProperty("driver"));
        } catch (IOException e) {
            e.printStackTrace();
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
    }
    public static Connection getConnection() {
        Connection connection=null;
        try {
            connection= DriverManager.getConnection(PROPERTIES.getProperty("url"),PROPERTIES.getProperty("name"),PROPERTIES.getProperty("password"));
        }
        catch (SQLException e){
            e.printStackTrace();
        }
        return connection;
    }
    //释放资源
    public static void closeAll(Connection connection, Statement statement, ResultSet resultSet){
        try {
            if (connection!=null){
                resultSet.close();
            }
            if (statement!=null){
                statement.close();
            }
            if (resultSet!=null){
                resultSet.close();
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}

import java.sql.Connection;
public class TestDbtuils {
    public static void main(String[] args) {
        Connection connection=DBUtils.getConnection();
        System.out.println(connection);
    }
}