PostgreSQL的JDBC实现：

<!-- https://mvnrepository.com/artifact/org.postgresql/postgresql -->
<dependency>
    <groupId>org.postgresql</groupId>
    <artifactId>postgresql</artifactId>
    <version>42.2.14</version>
</dependency>

连接Demo：

    public static void originConnection() throws SQLException {
        Connection connection = null;
        try {
            Class.forName("org.postgresql.Driver");
            connection = DriverManager.getConnection(
                    "jdbc:postgresql://127.0.0.1:5432/db01",
                    "postgres",
                    "123456"
            );
            System.out.println(connection);
        } catch (Exception e) {
            e.printStackTrace();
            System.err.println(e.getClass().getName()+": "+e.getMessage());
            System.exit(0);
        } finally {
            connection.close();
        }
        // System.out.println("Opened database successfully");
    }

封装工具类：

package cn.echo42.util;

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

/**
 * @author DaiZhiZhou
 * @file PostgreSQL-Connector
 * @create 2020-07-25 23:40
 */
public class PdbcUtil {

    private static Properties properties;

    static {
        try {
            properties = new Properties();
            InputStream inputStream = PdbcUtil.class.getClassLoader().getResourceAsStream("pdbc.properties");
            properties.load(inputStream);
            Class.forName(properties.getProperty("driver"));
        } catch (Exception exception) {
            exception.printStackTrace();
        }
    }

    public static Connection getConnection(){
        try {
            return DriverManager.getConnection(
                    properties.getProperty("url"),
                    properties.getProperty("user"),
                    properties.getProperty("password")
            );
        } catch (SQLException sqlException) {
            sqlException.printStackTrace();
        }
        return null;
    }

}

配置文件：

driver = org.postgresql.Driver
url = jdbc:postgresql://49.234.116.100:5432/db01
user = postgres
password = 123456

感觉和MySQL的Jdbc是完全一样的，只需要更换对应的配置信息和驱动包即可，程序的连接对象获取一样