jsp+servlet+javabean在线选课系统

package wsxk; import java.sql.*; public class ConDB{ public static Connection init(){ Connection conn = null; String url = "jdbc:odbc:xuanke"; try { Class.forName("sun.jdbc.odbc.JdbcOdbcDriver"); try { conn= DriverManager.getConnection(url); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } catch (ClassNotFoundException e) { e.printStackTrace(); } return conn; } public ResultSet executeQuery(String sql) { ResultSet rs = null; try { rs = null; //System.out.println(url); Connection conn= this.init(); //System.out.println(url); Statement stmt = conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_UPDATABLE); rs = stmt.executeQuery(sql); } catch (SQLException ex) { System.out.println("执行错误"); ex.printStackTrace();} return rs; } public void executeUpdate(String strSQL) { try { Connection conn= this.init(); Statement stmt = conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_UPDATABLE); stmt.executeQuery(strSQL); } catch(SQLException ex) { System.err.println("连接数据库失败了，异常为：" +ex.getMessage()); } } public String ex_chinese(String str) { if(str==null) { str ="" ; } else { try { str = new String(str.getBytes("iso-8859-1"),"gb2312") ; } catch (Exception ex) { System.err.println("异常为：" +ex.getMessage()); } } return str ; } public String gettime() { String datestr = "" ; try { java.text.DateFormat df = new java.text.SimpleDateFormat("yyyy年MM月dd日 HH点ss分") ; java.util.Date date = new java.util.Date() ; datestr = df.format(new java.util.Date()) ; } catch (Exception ex) { System.err.println("异常为：" +ex.getMessage()); } return datestr ; } public static void main(String args[]){ ConDB c = new ConDB(); } }