stuts.显示问题,深度痛苦中,大家帮帮我,这段代码哪里有问题,

Question

错误提示:javax.servlet.ServletException: Cannot find bean vec in scope requestpackage struts.javabean;
import struts.javabean.Commance;
import java.io.*;
import java.util.Vector;
import java.sql.*;
import struts.dbconnect;
import com.sun.tools.corba.se.idl.toJavaPortable.Compile;
public class FbplRs
{ private Statement stmt=null;
private ResultSet rs=null;
private Connection con=null; public FbplRs(){
 dbconnect db=new dbconnect();             
} public Vector getTitleId(String sql1,int numPages ,int currentPage) throws SQLException
{   int count=numPages;
        Statement stmt = null;
  Vector vec=new Vector();
  try
  {
  dbconnect db=new dbconnect();
 // con=pool.getConnection();
//  stmt=con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_READ_ONLY);
// rs=stmt.executeQuery(sql1);
 rs=db.executeQuery(sql1);
 rs.absolute(numPages*(currentPage-1)+1);   while(count>0)
  {        Commance show=new Commance();
  show.setUuid(rs.getString("uuid"));
//  show.setDate(rs.getString("PUBDATE"));
 // show.setContent(rs.getString("CONTENT"));
 // show.setKind(rs.getString("KIND"));
  vec.add(show);
  if(!rs.next()) break;
  count--;
   }
   rs.close();
  }
  catch (SQLException e) { return null;}   con.close();
  return vec;
}
}

Answer 1

javax.servlet.ServletException: Cannot find bean vec in scope request
在范围内找不到bean:vec
vec是个Vector型，从vec里面取数据的时候要强制类型转换，也就是转为Commance类型才能使用。
不知道是不是这个错误。

Answer 2

这是我的COMMANCE
package struts.javabean;
public class Commance
{
//private String content;
//private String date;
//private String kind;
private String uuid;
public String getUuid()
{
return uuid;
}
public void setUuid(String uuid)
{
this.uuid=uuid;
}
}

Answer 3

这是我的ACTION类。package struts.action;
import java.io.*;
import java.sql.ResultSet;
import java.util.Vector;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;import struts.javabean.FbplRs;
import struts.dbconnect;
import struts.javabean.Shown;public class FbplAction extends Action { dbconnect db=new dbconnect();
Shown show=new Shown();
Vector vec=new Vector(); public ActionForward execute(
ActionMapping mapping,
ActionForm form,
HttpServletRequest request,
HttpServletResponse response)
throws Exception
{ int i=1;
int numPages=2;              //第页显示条数
int nextPage ;
int upPage;
String sql;
String sql1; String pages = request.getParameter("page") ; // String type=request.getParameter("type");
// String id=request.getParameter("id"); // if(type==null||type.equals(""))
// {
// type=(String)request.getAttribute("type");
// id=(String)request.getAttribute("id");
// }
//
// String sql="select TITLE from "+type+" where ID='"+id+"'";
// ResultSet rs1=db.executeQuery(sql);
// if(rs1.next());
// String title=rs1.getString("TITLE"); int currentPage =(pages==null)?(1):(Integer.parseInt(pages));//当前页 sql = "select count(*) from [table]";
ResultSet rs = db.executeQuery(sql) ;
while(rs.next()) i = rs.getInt(1) ; int intPageCount=(i%numPages==0)?(i/numPages):(i/numPages+1);//总页数 if(currentPage>intPageCount) currentPage=intPageCount;
nextPage = currentPage+1;
if (nextPage>=intPageCount) nextPage=intPageCount;
upPage = currentPage-1;
if (upPage<=1) upPage=1;
Vector vec=new Vector();
FbplRs fbrs=new FbplRs(); sql1="select * from [table]";              vec=fbrs.getTitleId(sql1,numPages,currentPage);                        request.setAttribute("vec",vec); request.setAttribute("currentPage",String.valueOf(currentPage));
request.setAttribute("intPageCount",String.valueOf(intPageCount));
request.setAttribute("nextpage",String.valueOf(nextPage));
request.setAttribute("upPage",String.valueOf(upPage)); //request.setAttribute("type",type);
//request.setAttribute("uuid",uuid);
//request.setAttribute("title",title);
  System.out.println("SDFSDFSDF");
return mapping.findForward("success"); }}

Answer 4

public String getTitleId(String sql1,int numPages ,int currentPage) throws SQLException
{   int count=numPages;
        Statement stmt = null;
  Vector vec=new Vector();
  try
  {
  dbconnect db=new dbconnect();
 // con=pool.getConnection();
//  stmt=con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_READ_ONLY);
// rs=stmt.executeQuery(sql1);
 rs=db.executeQuery(sql1);
 rs.absolute(numPages*(currentPage-1)+1);   while(count>0)
  {        Commance show=new Commance();
  show.setUuid(rs.getString("uuid"));
//  show.setDate(rs.getString("PUBDATE"));
 // show.setContent(rs.getString("CONTENT"));
 // show.setKind(rs.getString("KIND"));
  vec.add(show);
  if(!rs.next()) break;
  count--;
   }
   rs.close();
  }
  catch (SQLException e) { return null;}   con.close();
  return (String)vec;
}试试?返回类型改了一下

Answer 5

nintha(注意休息)我试了， return (String)vec;提示语法有错误啊

Answer 6

我写错啦,不好意思,vector返回是个数组,你的返回类型得为String[]吧,关键是看你想要什么

Answer 7

Commance show=new Commance();你的commance没有构造函数

Answer 8

那就这么写:
return ((Commance)vec).getUuid();