最简单的Java连oracle方法

package com.sun.ATest;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class Main {

    private Connection conn = null;
    private Statement stmt = null;
    private ResultSet Rs = null;

    public void test() {
        // 创建数据库连接
        try {
            Class.forName("oracle.jdbc.driver.OracleDriver");
            //DriverManager.getConnection(url, userName, password);
            conn = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:orcl", "test",  "wangjj");
            stmt = conn.createStatement();
            Rs = stmt.executeQuery("select sysdate from dual");
            if (Rs.next()) {
                 System.out.println(Rs.getString("SYSDATE")); //SYSDATE 不区分大小写
                // System.out.println(Rs.getString(1)); //索引从 1 开始
            }
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (SQLException e) {
            e.printStackTrace();
        }
       
        //关闭操作 数据集 会话 连接
        try {
            Rs.close();
            stmt.close();
            conn.close();
        } catch (SQLException e) {

            e.printStackTrace();
        }
    }
    public static void main(String[] args) {
        new Main().test();
    }
}