===ShowTree.jsp===
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%@ page import="java.sql.*" %>
<%
Class.forName("oracle.jdbc.driver.OracleDriver");
Connection conn=DriverManager.getConnection("jdbc:oracle:thin:@127.0.0.1:1522:orcl","scott","tiger");
Statement st=conn.createStatement();
ResultSet rs=st.executeQuery("select * from article where pid=0");
%>
<%!
static String preout="";
private static void getTree(Connection conn,int id,int level) {
Statement st=null;
ResultSet rs=null;
String blk="";
String que="select * from article where pid="+id;
for(int i=0;i<level;i++) {
blk=blk+"---";
}
try {
st=conn.createStatement();
rs=st.executeQuery(que);
while(rs.next()) {
preout+="<tr><td>"+blk+rs.getInt("id")+"</td><td>"+"<a href='show article deatil.jsp?id="+rs.getInt("id")+"'>"+rs.getString("cont")+"</a>"+"</td></tr>";
if(rs.getInt("isLeaf")!=1) {
getTree(conn,rs.getInt("id"),level+1);
}
}
} catch(SQLException e) {
e.printStackTrace();
}
}
%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<hr>
<table border="1">
<%
rs.next();
%>
<tr><td><%=rs.getInt("id")%></td><td><%= rs.getString("cont")%></td></tr>
<%
getTree(conn,0,1);
out.print(preout);
%>
</table>>
</body>
<%
rs.close();
st.close();
conn.close();
%>
</html>递归算法...
1.找儿子
2.找父亲
只要有这两个ID, 理论上就可以将所有的article的关系遍历出来. 现实中的关系也是, 长辈/后辈, 构成了全部关系网.
显示链接内容.
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%@ page import="java.sql.*" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<%
String StrId=request.getParameter("id");
int id=Integer.parseInt(StrId);
Class.forName("oracle.jdbc.driver.OracleDriver");
Connection conn=DriverManager.getConnection("jdbc:oracle:thin:@127.0.0.1:1522:orcl","scott","tiger");
Statement st=conn.createStatement();
ResultSet rs=st.executeQuery("select * from article where id="+id);
%>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<%
if(rs.next()) {
%>
<h1><font color="green"><%=rs.getString("title") %></font></h1>
<hr>
<h4><%=rs.getString("cont") %></h4>
<%
}
%>
</body>
</html>