JDBC封装DBUtil
import java.sql.*;public class DBUtil {public static Connection getConnection(){Connection conn = null;try {Class.forName("com.mysql.jdbc.Driver");conn = DriverManager.getConnection("jdbc:mysql://localhost/test","root","root");} catch (Exception e) {e.printStackTrace();}return conn;}public static PreparedStatement prepare(Connection conn,String sql){PreparedStatement ps = null;try {ps = conn.prepareStatement(sql);} catch (SQLException e) {e.printStackTrace();}return ps;}public static void closeConnection(Connection conn){if(null != conn){try {conn.close();conn = null;} catch (SQLException e) {e.printStackTrace();}}}public static void closePreparedStatement(PreparedStatement ps){if(null != ps){try {ps.close();ps = null;} catch (SQLException e) {e.printStackTrace();}}}public static void closeResultSet(ResultSet rs){if(null != rs){try {rs.close();rs = null;} catch (SQLException e) {e.printStackTrace();}}}}

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