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java.lang.NullPointerException有关问题,各位大侠帮忙看看,着

热度:8971   发布时间:2013-02-25 21:13:46
java.lang.NullPointerException问题,各位大侠帮忙看看,在线等着
<%@page pageEncoding="GB18030" %>
<%@page import=" java.sql.*" %>
<%@page import=" java.util.*" %>
<%@page import="java.io.*" %>
<%@page import="com.bjsxt.bbs.*" %>
<%!
  private void tree(Set<Article> articles,Connection conn,int id,int grade){
  String sql = "select * from atticle where pid ="+id;
  Statement stmt = DB.createStmt(conn);
  ResultSet rs = DB.executeQuery(stmt,sql);
  try{
  while(rs.next()){
  Article a = new Article();
  a.setId(rs.getInt("id"));
  a.setPid(rs.getInt("pid"));
  a.setRootId(rs.getInt("rootid"));
  a.setTitle(rs.getString("title"));
  a.setLeaf(rs.getInt("isleaf")==0? true : false);
  a.setPdate(rs.getTimestamp("pdate"));
  a.setGrade(grade);
  articles.add(a);
  if(!a.isLeaf()){
  tree(articles,conn,a.getId(),grade+1);
  }
  }
  }catch(SQLException e){
  e.printStackTrace();
  }
  }
%>
<%
  Set<Article> articles = new HashSet<Article>();
  Connection conn = DB.getConn();
  tree(articles,conn,0,0);
  DB.close(conn);
%>
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