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();
            }
        }
    }
}