为什么老提示 类加载驱动失败呢?package com.iok.jee.dbc;import com.mysql.jdbc.*;import java.sql.*;import java.sql.Connection;import java.sql.PreparedStatement;import java.sql.Statement;import java.util.Properties;import java.sql.DriverManager;/** * Created by Administrator on 2018/1/20 0020. */public class Dbutils { private static Properties properties; private static String driverClassName; private static String url; private static String userName; private static String password; static { try { properties = new Properties(); properties.load(Dbutils.class.getClassLoader().getResourceAsStream("jdbc.properties")); driverClassName = properties.getProperty("driverClassName"); url = properties.getProperty("url"); userName = properties.getProperty("userName"); password = properties.getProperty("password"); Class.forName(driverClassName);/*加载驱动*/ /* DriverManager.registerDriver(new com.mysql.jdbc.Driver());*/ }catch (Exception e){ throw new ExceptionInInitializerError("类加载驱动失败!"); } } /*连接驱动*/ public static Connection getConnection(){ Connection conn=null; try{ conn = DriverManager.getConnection(url,userName,password); }catch (SQLException e){ e.printStackTrace();; } return conn; } /*获取语句对象*/ public static java.sql.Statement getStatment(java.sql.Connection conn){ java.sql.Statement stat=null; if(conn==null){ throw new IllegalArgumentException("连接对象为空无法获取语句对象"); } try{ stat= conn.createStatement(); }catch (SQLException e){ e.printStackTrace();; } return stat; }/*获取预编译语句对象*/ public static java.sql.PreparedStatement getPreparedStatement(java.sql.Connection conn,String sql){ PreparedStatement preparedStat=null; if(conn==null){ throw new IllegalArgumentException("连接对象为空无法获取预编译语句对象"); } if(sql==null||"".equals(sql)){ throw new IllegalArgumentException("sql语句为空无法获取预编译语句对象"); } try{ preparedStat= conn.prepareStatement(sql); }catch (SQLException e){ e.printStackTrace();; } return preparedStat; } public static void closeConnection (java.sql.Connection conn){ try{ if(conn!=null){/*如果连接不为空*/ if(!conn.isClosed()){/*如果连接未关闭*/ conn.close();/*关闭连接*/ } } }catch (SQLException e){ e.printStackTrace(); } } /*关闭语句对象*/ public static void closeStatement (java.sql.Statement stat){ try{ if(stat!=null){/*如果连接不为空*/ if(!stat.isClosed()){/*如果连接未关闭*/ stat.close();/*关闭连接*/ } } }catch (SQLException e){ e.printStackTrace(); } } /*关闭结果集*/ public static void closeResult (ResultSet rs){ try{ if(rs!=null){/*如果连接不为空*/ if(!rs.isClosed()){/*如果连接未关闭*/ rs.close();/*关闭连接*/ } } }catch (SQLException e){ e.printStackTrace(); } }}
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