JDBCUtils工具类的属性

package cn.itcast.util;

import java.io.FileReader;
import java.io.IOException;
import java.net.URL;
import java.sql.*;
import java.util.Properties;

/**
 * @author newcityman
 * @date 2019/8/14 - 22:13
 */
public class JDBCUtils {
 private static String url;
 private static String user;
 private static String password;
 private static String driver;


 static {
 try {
// 读取资源文件，获取值
// 1、创建properties集合类
 Properties prop = new Properties();
// 获取src路径下的文件的方式--->ClassLoader类加载器
 ClassLoader classLoader = JDBCUtils.class.getClassLoader();
 URL res = classLoader.getResource("jdbc.properties");
 String path = res.getPath();
 System.out.println(path);
// 2、加载文件
// prop.load(new FileReader("src/jdbc.properties"));
 prop.load(new FileReader(path));
// 3、 获取数据，赋值
 url = prop.getProperty("url");
 user = prop.getProperty("user");
 password = prop.getProperty("password");
 driver = prop.getProperty("driver");
// 4、注册驱动
 try {
 Class.forName(driver);
 } catch (ClassNotFoundException e) {
 e.printStackTrace();
 }

 } catch (IOException e) {
 e.printStackTrace();
 }
 }

 // 获取连接
 public static Connection getConnection() throws SQLException{
 return DriverManager.getConnection(url,user,password);
 }

 // 释放资源
 public static void close(Statement stmt, Connection conn) {
 if (stmt != null) {
 try {
 stmt.close();
 } catch (SQLException e) {
 e.printStackTrace();
 }
 }

 if (conn != null) {
 try {
 conn.close();
 } catch (SQLException e) {
 e.printStackTrace();
 }
 }
 }

 public static void close(ResultSet rs, Statement stmt, Connection conn) {
 if (rs != null) {
 try {
 rs.close();
 } catch (SQLException e) {
 e.printStackTrace();
 }
 }
 if (stmt != null) {
 try {
 stmt.close();
 } catch (SQLException e) {
 e.printStackTrace();
 }
 }

 if (conn != null) {
 try {
 conn.close();
 } catch (SQLException e) {
 e.printStackTrace();
 }
 }
 }
}