Java+Web新闻发布项目

package dao; import java.sql.*; import java.util.ArrayList; import po.NewsPO; import util.*; public class NewsDAO { private Connection con; private Statement stmt; private ResultSet rs; // 查询所有新闻 public ArrayList getNews() { ArrayList al = null; con = Tools.getConnection(); try { stmt = con.createStatement(); rs = stmt.executeQuery("select count(*) from news"); if(rs.next()) { int i = rs.getInt(1); if(i>0) { al = new ArrayList(); rs = stmt.executeQuery("select * from news"); while(rs.next()) { String title = rs.getString(1); String content = rs.getString(2); Date time = rs.getDate(3); NewsPO npo = new NewsPO(); npo.setContent(content); npo.setTime(time); npo.setTitle(title); al.add(npo); } } } } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } finally { try { rs.close(); stmt.close(); con.close(); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } return al; } public NewsPO getNewsBy(int id) { NewsPO npo = null; con = Tools.getConnection(); try { stmt = con.createStatement(); String sql = "select * from news where id = "+id; rs = stmt.executeQuery(sql); if(rs.next()) { npo = new NewsPO(); npo.setId(id); npo.setTime(rs.getDate(3)); npo.setContent(rs.getString(2)); npo.setTitle(rs.getString(1)); } } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } finally { try { rs.close(); stmt.close(); con.close(); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } return npo; } public boolean udapteNews(NewsPO npo) { boolean falg = false; con = Tools.getConnection(); try { stmt = con.createStatement(); //String sql = "select * from news where id = "+id; String sql = "update news set title='"+npo.getTitle()+"',content='"+npo.getContent()+"',time= "+npo.getTime()+",where id ="+npo.getId(); int i = stmt.executeUpdate(sql); if(i>0) { falg = true; } } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } finally { try { rs.close(); stmt.close(); con.close(); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } return falg; } public boolean deleteById(int id) { boolean flag =false; con = Tools.getConnection(); try { stmt = con.createStatement(); //String sql = "select * from news where id = "+id; //String sql = "update news set title='"+npo.getTitle()+"',content='"+npo.getContent()+"',time= "+npo.getTime()+",where id ="+npo.getId(); String sql = "delete from news where id ="+id; int i = stmt.executeUpdate(sql); if(i>0) { flag = true; } } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } finally { try { rs.close(); stmt.close(); con.close(); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } return flag; } public boolean add(NewsPO npo) { boolean falg = false; con = Tools.getConnection(); try { stmt = con.createStatement(); //String sql = "select * from news where id = "+id; String sql = "insert into news values('"+npo.getTitle()+"','"+npo.getContent()+"',"+npo.getTime()+"')"; int i = stmt.executeUpdate(sql); if(i>0) { falg = true; } } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } finally { try { rs.close(); stmt.close(); con.close(); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } return falg; } } package dao; import java.sql.*; import java.util.ArrayList; import po.NewsPO; import util.*; public class NewsDAO { private Connection con; private Statement stmt; private ResultSet rs; // 查询所有新闻 public ArrayList getNews() { ArrayList al = null; con = Tools.getConnection(); try { stmt = con.createStatement(); rs = stmt.executeQuery("select count(*) from news"); if(rs.next()) { int i = rs.getInt(1); if(i>0) { al = new ArrayList(); rs = stmt.executeQuery("select * from news"); while(rs.next()) { String title = rs.getString(1); String content = rs.getString(2); Date time = rs.getDate(3); NewsPO npo = new NewsPO(); npo.setContent(content); npo.setTime(time); npo.setTitle(title); al.add(npo); } } } } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } finally { try { rs.close(); stmt.close(); con.close(); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } return al; } public NewsPO getNewsBy(int id) { NewsPO npo = null; con = Tools.getConnection(); try { stmt = con.createStatement(); String sql = "select * from news where id = "+id; rs = stmt.executeQuery(sql); if(rs.next()) { npo = new NewsPO(); npo.setId(id); npo.setTime(rs.getDate(3)); npo.setContent(rs.getString(2)); npo.setTitle(rs.getString(1)); } } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } finally { try { rs.close(); stmt.close(); con.close(); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } return npo; } public boolean udapteNews(NewsPO npo) { boolean falg = false; con = Tools.getConnection(); try { stmt = con.createStatement(); //String sql = "select * from news where id = "+id; String sql = "update news set title='"+npo.getTitle()+"',content='"+npo.getContent()+"',time= "+npo.getTime()+",where id ="+npo.getId(); int i = stmt.executeUpdate(sql); if(i>0) { falg = true; } } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } finally { try { rs.close(); stmt.close(); con.close(); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } return falg; } public boolean deleteById(int id) { boolean flag =false; con = Tools.getConnection(); try { stmt = con.createStatement(); //String sql = "select * from news where id = "+id; //String sql = "update news set title='"+npo.getTitle()+"',content='"+npo.getContent()+"',time= "+npo.getTime()+",where id ="+npo.getId(); String sql = "delete from news where id ="+id; int i = stmt.executeUpdate(sql); if(i>0) { flag = true; } } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } finally { try { rs.close(); stmt.close(); con.close(); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } return flag; } public boolean add(NewsPO npo) { boolean falg = false; con = Tools.getConnection(); try { stmt = con.createStatement(); //String sql = "select * from news where id = "+id; String sql = "insert into news values('"+npo.getTitle()+"','"+npo.getContent()+"',"+npo.getTime()+"')"; int i = stmt.executeUpdate(sql); if(i>0) { falg = true; } } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } finally { try { rs.close(); stmt.close(); con.close(); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } return falg; } }