连接oracle数据库

mysql.properties文件

oracle.driver=oracle.jdbc.driver.OracleDriver
oracle.url=jdbc:oracle:thin:@localhost:1521:xe
oracle.username=数据库名称
oracle.password=密码

oracle连接数据库代码

package com.zy.utils;

import java.io.IOException;
import java.sql.CallableStatement;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.Properties;

public class DBUtil {
    
    private static String driver = "" ;
    private static String url = "" ;
    private static String username = "" ;
    private static String password = "" ;
    
    static {
        Properties pp = new Properties();
        try {
            pp.load(DBUtil.class.getClassLoader().getResourceAsStream("mysql.properties"));
            driver = pp.getProperty("oracle.driver");
            url = pp.getProperty("oracle.url");
            username = pp.getProperty("oracle.username");
            password = pp.getProperty("oracle.password");
            Class.forName(driver);
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        
    }
    

    public static Connection getConnection (){
        Connection conn = null ;
        try {
            conn = DriverManager.getConnection(url, username, password);
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return conn ;
    }
    
    public static void close(ResultSet rs , CallableStatement cs , Connection conn){
        try {
            if(rs!=null /*&& !rs.isClosed()*/){
                rs.close();
            }
            if(cs!=null/* && !ps.isClosed()*/){
                cs.close();
            }
            if(conn!=null /*&& !conn.isClosed()*/){
                conn.close();
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
    
    public static void main(String[] args) {
        System.out.println(DBUtil.getConnection());
    }
    
}

 调用该数据库方法

package com.zy.dao;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;

import com.zy.utils.DBUtil;

public class QueryAll {
    
    Connection conn=null;
    PreparedStatement ps=null;
    ResultSet rs=null;
    ArrayList<String> arrayList=new ArrayList<String>();
    
    public void getConn(){
        conn= DBUtil.getConnection();
    }
    
    public void callProc(){
        String sql="select * from t_user";
        try {
            ps=conn.prepareStatement(sql);
            rs=ps.executeQuery();
            while(rs.next()){
                arrayList.add(rs.getString("password"));
            }
            System.out.println(arrayList);
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }finally{
            try {
                rs.close();
                ps.close();
                conn.close();
            } catch (SQLException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }
    
    public static void main(String[] args) {
        QueryAll queryAll=new QueryAll();
        queryAll.getConn();
        queryAll.callProc();
    }

}