Java jdbc 连接oracle之三（封装工具类）

driver = oracle.jdbc.driver.OracleDriver
url = jdbc:oracle:thin:@192.168.10.105:1521:orcl
user = LF
password = LF

package com.lf.testdatabase;

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

public class JdbcTools {
    //properties文件名
    private static String defaultName = "jdbc.properties";
    /**
     * 获取Connection
     * @return connection
     * @throws Exception
     */
    public static Connection getConnection(){
        Connection connection = getConnection(defaultName);
        return connection;
    }
    /**
     * 通过properties文件名获取Connection
     * @param fileName  properties文件名
     * @return          Connection
     * @throws Exception
     */
    public static Connection getConnection(String fileName) {
        //IO流读取jdbc.properties文件
        InputStream in = JdbcTools.class.getClassLoader().getResourceAsStream(fileName);
        // 读取参数
        Properties p = new Properties();
        try {
            p.load(in);
        } catch (IOException e) {
            e.printStackTrace();
        }
        String url = p.getProperty("url");
        String user = p.getProperty("user");
        String password = p.getProperty("password");
        String driver=p.getProperty("driver");
        try {
            Class.forName(driver);
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
        Connection connection=null;
        try {
            connection = DriverManager.getConnection(url, user, password);
        } catch (SQLException e) {
            e.printStackTrace();
        }

        try {
            if (in!=null) {
                in.close();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }

        return connection;
    }

}