女强穿越玄幻完结小说,小说网,完结小说

實(shí)現(xiàn)論壇樹型結(jié)構(gòu)的算法很多，具體你可以去www.chinaasp.com的全文搜索中查詢。我現(xiàn)在的JSP論壇采用的也是當(dāng)中的一種：不用遞歸實(shí)現(xiàn)樹型結(jié)構(gòu)的算法，現(xiàn)在我將論壇樹型結(jié)構(gòu)的具體算法和大家介紹一下，和大家一起交流。

1。演示表的結(jié)構(gòu)：
表名：mybbslist
字段
數(shù)據(jù)類型
說明
BBSID 自動(dòng)編號(hào)
RootID Int 根帖ID，本身為根帖則RootID = ID
FID Int 父帖ID，上一層帖子的ID，如是根帖則FID = 0
DEPTH Int 根帖Level=0，其他依據(jù)回復(fù)的深度遞增
BBSSubject Char 主題

2。創(chuàng)建表：
create table mybbslist (
forumID int(20) not null,
bbsID int auto_increment primary key,
rootid int(20) not null,
fid int(20) not null,
depth int(20) not null,
userID int(20) not null,
bbsUser varchar(24) not null,
bbsSubject varchar(100) not null,
bbsContent text,
bbsTime varchar(30),
bbsRead int(20),
bbsReply int(20),
INDEX forumID (forumID))

3。連接MYSQL數(shù)據(jù)庫(kù)的BEAN
package netzero;
import java.sql.*;
public class mydb
{
String driverName = "org.gjt.mm.mysql.Driver";
Connection conn = null;
Statement stmt = null;
ResultSet rs = null;
String connURL= "jdbc:mysql://localhost/mybbs?user=rootpassword=howuseUnicode=truecharacterEncode=8859_1";
//String connURL= "jdbc:mysql://localhost/netzerobbs?user=rootpassword=how";
public mydb()
{
try
{
Class.forName(driverName);
}
catch (java.lang.ClassNotFoundException e)
{
System.err.println("netzero(String): " + e.getMessage());
}
}

public ResultSet executeQuery(String sql) throws SQLException
{
conn = DriverManager.getConnection(connURL);
stmt = conn.createStatement();
rs = stmt.executeQuery(sql);
return rs;
}

public boolean closeConn()
{
try
{
if (rs!=null) rs.close();
if (stmt!=null) stmt.close();
if (conn!=null) conn.close();
return true;
}
catch ( SQLException ex )
{
System.err.println("closeConn: " + ex.getMessage());
return false;
}
}

}

4。顯示論壇的JSP程序
jsp:useBean id="mybbs" scope="session" class="netzero.mydb" />
%@ page contentType="text/html;charset=gb2312" %>
%@ page import="java.io.*" %>
%@ page import="java.sql.*" %>
%
int intRowCount;
out.print("顯示論壇樹形結(jié)構(gòu)");
out.print("br>br>");
try {
String sql="select * from mybbslist order by rootid desc,depth,fid,bbsid";
ResultSet rs = mybbs.executeQuery(sql);
if (rs.next())
{
rs.last();
intRowCount=rs.getRow();
out.print("論壇樹中有");
out.print(intRowCount);
out.print("個(gè)葉子節(jié)點(diǎn)");
rs.first();
int j=0;
int Depth = 0;
out.print("ul>");
while(jintRowCount)
{
int rsDepth=rs.getInt("Depth");
if (rsDepthDepth)
{
for(int i=1;iDepth+1;i=i+1)
{
out.print("/ul>");
}
}
rsDepth=rs.getInt("Depth");
if (rsDepth>Depth)
{
out.print("ul>");
}
out.print("li>");

String bbssubject=rs.getString("bbssubject");
out.print(bbssubject);
out.print("/li>");
Depth = rs.getInt("Depth");
j=j+1;
rs.next();
}
out.print("/ul>");
}
else
{
out.print("數(shù)據(jù)庫(kù)中無(wú)記錄");
}
}catch (SQLException E) {
out.println("SQLException: " + E.getMessage());
out.println("SQLState: " + E.getSQLState());
out.println("VendorError: " + E.getErrorCode());
}
%>
% //關(guān)閉mysql連接
try {
if(!mybbs.closeConn());
} catch (Exception ex) {
System.err.println("closeConn: " + ex.getMessage());
}
%>

算法參考：http://www.chinaasp.com/sqlbbs/showEssence.asp?id=4783

標(biāo)簽：保定紹興北海廣元吳忠肇慶玉樹潮州

巨人網(wǎng)絡(luò)通訊聲明：本文標(biāo)題《實(shí)現(xiàn)論壇樹型結(jié)構(gòu)的具體算法》，本文關(guān)鍵詞實(shí)現(xiàn),論壇,樹型,結(jié)構(gòu),的,；如發(fā)現(xiàn)本文內(nèi)容存在版權(quán)問題，煩請(qǐng)?zhí)峁┫嚓P(guān)信息告之我們，我們將及時(shí)溝通與處理。本站內(nèi)容系統(tǒng)采集于網(wǎng)絡(luò)，涉及言論、版權(quán)與本站無(wú)關(guān)。

濮阳杆衣贸易有限公司

實(shí)現(xiàn)論壇樹型結(jié)構(gòu)的具體算法