JDBC工具類類

package Util;

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

/**
 * JDBCUtils類
 */
public class JDBCUtils {

    private static String url;
    private static String user;
    private static String password;
    private static String driver;
    /**
     * 靜態代碼塊加載資源文件
     */
    static {
        Properties properties = new Properties();
        //獲取src路徑下的文件
        ClassLoader classLoader = JDBCUtils.class.getClassLoader();
        URL resource = classLoader.getResource("jdbc.properties");
        String path = resource.getPath();
        //加載資源文件
        try {
            properties.load(new FileReader(path));
        } catch (IOException e) {
            e.printStackTrace();
        }
        url = properties.getProperty("url");
        user = properties.getProperty("user");
        password = properties.getProperty("password");
        driver = properties.getProperty("driver");
        //註冊驅動
        try {
            Class.forName(driver);
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
    }

    /**
     * 獲取連接
     * @return 連接對象
     */
    public static Connection getConnection(){

        try {
            return  DriverManager.getConnection(url, user, password);
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 資源關閉
     * @param statement 執行SQL語句的對象
     * @param connection 連接對象
     */
    public static void close(Statement statement,Connection connection){

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

    /**
     * 資源關閉
     * @param resultSet 結果集
     * @param statement statement對象
     * @param connection 連接對象
     */
    public static void close(ResultSet resultSet, Statement statement, Connection connection){
        if(resultSet!=null){
            try {
                resultSet.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        if(statement!=null) {
            try {
                statement.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        if(connection!=null) {
            try {
                connection.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }
}