一个小疑点.关于多行记录的插入

public class Entry extends HttpServlet {    public void doPost(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {        String[] id=request.getParameterValues("id");        String[] name=request.getParameterValues("name");            String[] cid=request.getParameterValues("cid");            String[] cname=request.getParameterValues("cname");            String[] time=request.getParameterValues("time");        String[] ps=request.getParameterValues("ps");        String[]  es=request.getParameterValues("es");//这个是得到每一列的值数组.        int[] a=new int[ps.length];//因为数据库这2个字段是int类型的        int[] b=new int[es.length];//这个是把得到的字符型数组转为整型数组                     for(int u=0;u<ps.length;u++){            a[u]=Integer.parseInt(ps[u]);            b[u]=Integer.parseInt(es[u]);            System.out.println(a[u]);            System.out.println(b[u]);            }        response.setContentType("text/html");        response.setCharacterEncoding("gbk");        ConnSqlServer co=new ConnSqlServer();        Connection ct=co.connDb();        int i=-1;        try{                          //遍历每一列的数组然后插入数据库            for(int y=0;i<a.length;y++){                String mid=id[y];                String mname=name[y];                String mcid=cid[y];                String mcname=cname[y];                String mtime=time[y];                int mps=a[y];                int mes=a[y];                System.out.println("1123");                                i=                    ct.createStatement().executeUpdate("insert grades(stuId,stuName,classId,className,semester,pscores,escores) " +                            "values('"+mid+"','"+mname+"','"+mcid+"','"+mcname+"','"+mtime+"','"+mps+"','"+mes+"')");                    System.out.println("dddtt");            }                }catch(Exception e){            e.printStackTrace();        }finally{            co.close();        }        if(i!=-1)        {            response.sendRedirect("http://localhost:8080/proj/sucessful.jsp");        }                                        }