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[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>

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原文地址：https://www.cnblogs.com/robbychan/p/3786851.html

[BBS] ShowArticleTree.jsp 01 帖子的树形展现-递归 、Session 存 login 否

[BBS] ShowArticleTree.jsp 01 帖子的树形展现-递归、Session 存 login 否