[BBS] ShowArticleTree.jsp 01 帖子的树形展现-递归 、Session 存 login 否
BBS - ShowArticleTree.jsp
<%@ page language="java" contentType="text/html; charset=gbk"
pageEncoding="gbk"%>
<%@ page import="java.sql.*"%>
<%
String admin = (String) session.getAttribute("admin");
if (admin != null && admin.equals("true")) {
login = true;
}
%>
<%!// 成员属性
String str = "";
boolean login = false;
private void tree(Connection conn, int id, int level) {
Statement stmt = null;
ResultSet rs = null;
String preStr = "";
for (int i = 0; i < level; i++) {
preStr += "----";
}
try {
stmt = conn.createStatement();
String sql = "select * from article where pid = " + id;
rs = stmt.executeQuery(sql);
String strLogin = "";
while (rs.next()) {
if (login) {
strLogin = "<td><a href='Delete.jsp?id=" + rs.getInt("id")
+ "&pid=" + rs.getInt("pid") + "'>删除</a>";
}
str += "<tr><td>" + rs.getInt("id") + "</td><td>" + preStr
+ "<a href='ShowArticleDetail.jsp?id="
+ rs.getInt("id") + "'>" + rs.getString("title")
+ "</a></td>" + strLogin + "</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 (stmt != null) {
stmt.close();
stmt = null;
}
} catch (SQLException e) {
e.printStackTrace();
}
}
}%>
<%
Class.forName("com.mysql.jdbc.Driver");
String url = "jdbc:mysql://localhost/bbs?user=root&password=root";
Connection conn = DriverManager.getConnection(url);
Statement stmt = conn.createStatement();
ResultSet rs = stmt
.executeQuery("select * from article where pid = 0");
String strLogin = "";
while (rs.next()) {
if (login) {
strLogin = "<td><a href='Delete.jsp?id=" + rs.getInt("id")
+ "&pid=" + rs.getInt("pid") + "'>删除</a></td>";
}
str += "<tr><td>" + rs.getInt("id") + "</td><td>"
+ "<a href='ShowArticleDetail.jsp?id="
+ rs.getInt("id") + "'>" + rs.getString("title")
+ "</a></td>" + strLogin + "</tr>";
if (rs.getInt("isleaf") != 0) {
tree(conn, rs.getInt("id"), 1);
}
}
rs.close();
stmt.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=gbk">
<title>Insert title here</title>
</head>
<body>
<a href="Post.jsp">发表新帖</a>
<table border="1">
<%=str%>
<%
str = ""; // 恢复变量初始值
login = false;
%>
</table>
</body>
</html>