1.导入表格模板
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<%@ page import="java.sql.*" %>
<%
Class.forName("com.mysql.jdbc.Driver");
Connection conn=DriverManager.getConnection("jdbc:mysql://localhost:3306/bbs","root","root");
PreparedStatement ps=conn.prepareStatement("select * from article");
ResultSet rs=ps.executeQuery();
%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>ShowArticleTree</title>
</head>
<body>
<table border="">
<%
while(rs.next()){
%>
<tr>
<td><%=rs.getInt("id") %></td>
<td><%=rs.getString("cont") %></td>
</tr>
<%
}
%>
</table>
</body>
<%
rs.close();
ps.close();
conn.close();
%>
</html>
2.树形利用递归进行遍历算法，求根帖子
<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%>
<%@ page import="java.sql.*" %>
<%!
String str="";
private void tree(Connection conn,int id,int level){
PreparedStatement ps=null;
ResultSet rs=null;
String preStr="";
for(int i=0;i<level;i++){
preStr+="****";
}
try{
String sql="select * from article where pid ="+id;
ps=conn.prepareStatement(sql);
rs=ps.executeQuery();
while(rs.next()){
str+="<tr><td>"+rs.getInt("id")+"</td><td>"+preStr+
rs.getString("cont")+"</td></tr>";
if(rs.getInt("isleaf")!=0){
tree(conn,rs.getInt("id"),level+1);
}
}
}catch(SQLException e){
e.printStackTrace();
}finally{
try{
if(rs!=null) {
rs.close();
rs=null;
}
if(ps!=null) {
ps.close();
ps=null;
}
}catch(SQLException e2){
e2.printStackTrace();
}
}
}
%>
<%
Class.forName("com.mysql.jdbc.Driver");
Connection conn=DriverManager.getConnection("jdbc:mysql://localhost:3306/bbs","root","root");
PreparedStatement ps=conn.prepareStatement("select * from article where pid=0");
ResultSet rs=ps.executeQuery();
while(rs.next()){
str+="<tr><td>"+rs.getInt("id")+"</td><td>"+rs.getString("cont")+"</td></tr>";
if(rs.getInt("isleaf")!=0){
tree(conn,rs.getInt("id"),1);
}
}
rs.close();
ps.close();
conn.close();
%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>ShowArticleTree</title>
</head>
<body>
<table border="1">
<%=str%>
</table>
</body>
</html>