JDBC获取连接、关闭连接的简单工具类

import java.sql.Connection;import java.sql.DriverManager;import java.sql.ResultSet;import java.sql.SQLException;import java.sql.Statement;public final class JdbcUtils {private static String url = "jdbc:mysql://localhost:3306/jdbc";private static String user = "root";private static String password = "";private JdbcUtils() {}static {try {Class.forName("com.mysql.jdbc.Driver");} catch (ClassNotFoundException e) {throw new ExceptionInInitializerError(e);}}public static Connection getConnection() throws SQLException {return DriverManager.getConnection(url, user, password);}public static void free(ResultSet rs, Statement st, Connection conn) {try {if (rs != null)rs.close();} catch (SQLException e) {e.printStackTrace();} finally {try {if (st != null)st.close();} catch (SQLException e) {e.printStackTrace();} finally {if (conn != null)try {conn.close();} catch (SQLException e) {e.printStackTrace();}}}}}