JSP+JavaBean+Servlet实现新闻发布

package org.langsin.news.logic; import java.sql.Connection; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; import java.util.ArrayList; import java.util.List; import org.langsin.news.comm.DataSource; import org.langsin.news.data.NewsDataBean; public class NewsLogicBean { private int allRows; private int curPage=1; private int rowPerPage=5; private int allPages; public int getCurPage() { return curPage; } public void setCurPage(int curPage) { this.curPage = curPage; } public int getAllPages() { return allPages; } public int getAllRows() { return allRows; } public int getRowPerPage() { return rowPerPage; } @SuppressWarnings("unchecked") public List findAll(){ List list=new ArrayList(); Statement st=null; ResultSet rs=null; try { st=DataSource.getConnection().createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_READ_ONLY); rs=st.executeQuery("select newsid,newstitle,newscontent,newscount,newsdate from news order by newsdate desc"); rs.last(); this.allRows=rs.getRow(); if(this.allRows%this.rowPerPage==0){ this.allPages=this.allRows/this.rowPerPage; }else{ this.allPages=this.allRows/this.rowPerPage+1; } if(this.curPage==1){ rs.beforeFirst(); }else{ rs.absolute((this.curPage-1)*this.rowPerPage); } int i=0; while(rs.next()&&i<this.rowPerPage){ NewsDataBean bean=new NewsDataBean(); bean.setNewsid(rs.getString(1)); bean.setNewstitle(rs.getString(2)); bean.setNewscontent(rs.getString(3)); bean.setNewscount(rs.getString(4)); bean.setNewsdate(rs.getString(5)); list.add(bean); i++; } } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } return list; } public int insertNews(String newsTitle,String newsContent){ return modify("insert into news(newstitle,newscontent,newscount,newsdate) values('"+newsTitle+"','"+newsContent+"',0,now())"); } public int modify(String sql){ int result=0; Statement st=null; try { st=DataSource.getConnection().createStatement(); result=st.executeUpdate(sql); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); }finally{ try { st.close(); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } return result; } public int deleteId(String newsid){ return modify("delete from news where newsid="+newsid); } public int updateNews(String newsid,String newsTitle,String newsContent){ return modify("update news set newstitle='"+newsTitle+"',newscontent='"+newsContent+"' where newsid="+newsid); } public NewsDataBean findById(String newsid){ NewsDataBean bean=new NewsDataBean(); Statement st=null; ResultSet rs=null; try { st=DataSource.getConnection().createStatement(); rs=st.executeQuery("select newsid,newstitle,newscontent,newscount,newsdate from news where newsid="+newsid); if(rs.next()){ bean.setNewsid(rs.getString(1)); bean.setNewstitle(rs.getString(2)); bean.setNewscontent(rs.getString(3)); bean.setNewscount(rs.getString(4)); bean.setNewsdate(rs.getString(5)); } } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } return bean; } public NewsDataBean detail(String newsid){ NewsDataBean bean=new NewsDataBean(); Statement st=null; ResultSet rs=null; try { st=DataSource.getConnection().createStatement(); st.executeUpdate("update news set newscount=newscount+1 where newsid="+newsid); rs=st.executeQuery("select newsid,newstitle,newscontent,newscount,newsdate from news where newsid="+newsid); if(rs.next()){ bean.setNewsid(rs.getString(1)); bean.setNewstitle(rs.getString(2)); bean.setNewscontent(rs.getString(3)); bean.setNewscount(rs.getString(4)); bean.setNewsdate(rs.getString(5)); } } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } return bean; } public static void main(String[] args) { // TODO Auto-generated method stub List list=new NewsLogicBean().findAll(); System.out.println(list.size()); } }