初学JSP制作的论坛
2008-08-02 17:09
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一个简单的练习，没有做什么前台，用到了递归，参数传递，数据库操作，session以及字符编码转换。
其中有两个主要问题费了一些时间：
1.ResultSet对象的getRow()方法是返回指针指向的行，next()可以移动到下一行
2.字符转换的问题可以用 new String(Str.getBytes("ISO-8859-1")) ,有时候request.setCharacterEncoding("GB2312")转换的时候不是很有效。还是太菜，有待考证。
--bbs.sql
--创建数据库
create database bbs;
use bbs;
--创建表
--使用
create table article(
id int primary key auto_increment,
--父节点id
pid int,
--根结点id
rootid int,
title varchar(255),
cont text,
pdate datetime,
--是否是叶子节点
isleaf int
);
--0 代表leaf ,1代表非leaf
insert into article values (null,0,1,'蚂蚁大战大象','蚂蚁大战大象',now(),1);
insert into article values (null,1,1,'大象被打趴下了','大象被打趴下了',now(),1);
insert into article values (null,2,1,'蚂蚁也不好过','蚂蚁也不好过',now(),0);
insert into article values (null,2,1,'瞎说','瞎说',now(),1);
insert into article values (null,4,1,'没有瞎说','没有瞎说',now(),0);
insert into article values (null,1,1,'怎么可能','怎么可能',now(),1);
insert into article values (null,6,1,'怎么没有可能','怎么没有可能',now(),0);
insert into article values (null,6,1,'可能性是很大的','可能性是很大的',now(),0);
insert into article values (null,2,1,'大象进医院了','大象进医院了',now(),1);
insert into article values (null,9,1,'护士是蚂蚁','护士是蚂蚁',now(),0);
//ShowArticleTree.jsp
<%@ page language="java" contentType="text/html;charset=gb2312" pageEncoding="gb2312"%>
<%@ page import="java.sql.*" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
Class.forName("com.mysql.jdbc.Driver");
String url = "jdbc:mysql://localhost:3306/bbs?user=root&password=root";
Connection conn = DriverManager.getConnection(url);
Statement smt = conn.createStatement();
ResultSet rs = smt.executeQuery("select * from article where pid=0");
while( rs.next() ){
str = "<tr><td>" + rs.getInt("id") + "</td><td>" +
"<a href='ArticleDetail.jsp?id=" + rs.getInt("id") + "'>"
+ rs.getString("title") + "</a>" + "</td><td>" + "<a href='Delete.jsp?id=" +
rs.getInt("id") + "'>" + "删除</a>"+ "</td></tr>";
if( rs.getInt("isleaf") != 0){
Tree(conn,rs.getInt("id"),1);
}
}
rs.close();
smt.close();
conn.close();
%>
<%!
String str="";
private void Tree(Connection conn,int id,int level) {
String preString = "";
Statement stm = null;
ResultSet rs = null;
for(int i=0;i<level;i++){
preString += "----";
}
try{
stm = conn.createStatement();
rs = stm.executeQuery("select * from article where pid="+ id );
while(rs.next()){
str += "<tr><td>" + rs.getInt("id") + "</td><td>" +
preString + "<a href='ArticleDetail.jsp?id=" + rs.getInt("id") + "'>"
+ rs.getString("title") + "</a></td>"+ "<td>" + "<a href='Delete.jsp?id=" +
rs.getInt("id") + "'>" + "删除</a>"+ "</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(stm != null){
stm.close();
stm = null;
}
}catch(SQLException e){
e.printStackTrace();
}
}
}
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>论坛的树状结构</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body>
This is my BBS page. <br>
<table border="1">
<%= str %>
</table>
</body>
</html>
//ArticleDetail.jsp
<%@ page language="java" contentType="text/html;charset=gbk" pageEncoding="gbk"%>
<%@ page import=" java.sql.* " %>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
String paraId=request.getParameter("id");
int id = Integer.parseInt(paraId);
Class.forName("com.mysql.jdbc.Driver");
String url = "jdbc:mysql://localhost:3306/bbs?user=root&password=root";
Connection conn = DriverManager.getConnection(url);
Statement smt = conn.createStatement();
ResultSet rs = smt.executeQuery("select * from article where id=" + id);
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>主题的标题和内容</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body>
<%
if( rs.next() ) {
%>
<table border=1>
<tr>
<td>ID</td>
<td><%= rs.getInt("id") %></td>
</tr>
<tr>
<td>Title</td>
<td><%= rs.getString("title") %></td>
</tr>
<tr>
<td>Cont</td>
<td><%=rs.getString("Cont")%></td>
</tr>
</table>
<a href="Reply.jsp?id=<%=rs.getInt("id") %>&rootid=<%=rs.getInt("rootid") %>">回复</a>
<a href="Delete.jsp?id=<%=rs.getInt("id") %>">删除</a>
<% } %>
<%
rs.close();
smt.close();
rs.close();
%>
</body>
</html>
//Delete.jsp
<%@ page language="java" contentType="text/html;charset=GB2312" pageEncoding="GB2312"%>
<%@ page import="java.sql.*" %>
<%!
private void delete(Connection conn,int id) {
Statement stm = null;
ResultSet rs = null;
try{
stm = conn.createStatement();
String sql = "select * from article where pid=" + id;
rs = stm.executeQuery(sql);
while( rs.next() ) {
delete(conn , rs.getInt("id") );
}
stm.executeUpdate("delete from article where id=" + id);
}catch(SQLException e){
e.printStackTrace();
}finally{
try {
if( rs != null) {
rs.close();
rs = null;
}
if( stm != null ) {
stm.close();
stm = null;
}
}catch(SQLException e){
e.printStackTrace();
}
}
}
%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
int id = Integer.parseInt(request.getParameter("id"));
int pid = Integer.parseInt(request.getParameter("pid"));
Class.forName("com.mysql.jdbc.Driver");
String url = "jdbc:mysql://localhost:3306/bbs?user=root&password=root";
Connection conn = DriverManager.getConnection(url);
conn.setAutoCommit(false);
delete(conn,id);
conn.commit();
conn.setAutoCommit(true);
String sql = "select count(*) from article where pid=" + pid;
Statement stm1 = conn.createStatement();
ResultSet rs = stm1.executeQuery(sql);
rs.next();
int count = rs.getInt(1);
if(count <=0 ) {
stm1.executeUpdate("update article set isleaf=0 where id=" + pid);
}
rs.close();
stm1.close();
conn.close();
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'Delete.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body>
<% response.sendRedirect("ShowArticleTree.jsp"); %>
</body>
</html>
//Reply.jsp
<%@ page language="java" contentType="text/html; charset=GB2312"
pageEncoding="GB2312"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
int id = Integer.parseInt(request.getParameter("id"));
int rootid = Integer.parseInt(request.getParameter("rootid"));
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>回复页面</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body>
<form action="ReplyOk.jsp">
<input type="hidden" name="id" value="<%=id %>" />
<input type="hidden" name="rootid" value="<%=rootid %>" />
<input type="hidden" name="testString" value="回答是开放" />
<table border="1">
<tr>
<td><input type="text" name="title" size="80" /></td>
</tr>
<tr>
<td><textarea rows="15" cols="80" name="cont"></textarea></td>
</tr>
<tr>
<td><input type="submit" value="回复" /></td>
</tr>
</table>
</form>
</body>
</html>
其中有两个主要问题费了一些时间：
1.ResultSet对象的getRow()方法是返回指针指向的行，next()可以移动到下一行
2.字符转换的问题可以用 new String(Str.getBytes("ISO-8859-1")) ,有时候request.setCharacterEncoding("GB2312")转换的时候不是很有效。还是太菜，有待考证。
--bbs.sql
--创建数据库
create database bbs;
use bbs;
--创建表
--使用
create table article(
id int primary key auto_increment,
--父节点id
pid int,
--根结点id
rootid int,
title varchar(255),
cont text,
pdate datetime,
--是否是叶子节点
isleaf int
);
--0 代表leaf ,1代表非leaf
insert into article values (null,0,1,'蚂蚁大战大象','蚂蚁大战大象',now(),1);
insert into article values (null,1,1,'大象被打趴下了','大象被打趴下了',now(),1);
insert into article values (null,2,1,'蚂蚁也不好过','蚂蚁也不好过',now(),0);
insert into article values (null,2,1,'瞎说','瞎说',now(),1);
insert into article values (null,4,1,'没有瞎说','没有瞎说',now(),0);
insert into article values (null,1,1,'怎么可能','怎么可能',now(),1);
insert into article values (null,6,1,'怎么没有可能','怎么没有可能',now(),0);
insert into article values (null,6,1,'可能性是很大的','可能性是很大的',now(),0);
insert into article values (null,2,1,'大象进医院了','大象进医院了',now(),1);
insert into article values (null,9,1,'护士是蚂蚁','护士是蚂蚁',now(),0);
//ShowArticleTree.jsp
<%@ page language="java" contentType="text/html;charset=gb2312" pageEncoding="gb2312"%>
<%@ page import="java.sql.*" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
Class.forName("com.mysql.jdbc.Driver");
String url = "jdbc:mysql://localhost:3306/bbs?user=root&password=root";
Connection conn = DriverManager.getConnection(url);
Statement smt = conn.createStatement();
ResultSet rs = smt.executeQuery("select * from article where pid=0");
while( rs.next() ){
str = "<tr><td>" + rs.getInt("id") + "</td><td>" +
"<a href='ArticleDetail.jsp?id=" + rs.getInt("id") + "'>"
+ rs.getString("title") + "</a>" + "</td><td>" + "<a href='Delete.jsp?id=" +
rs.getInt("id") + "'>" + "删除</a>"+ "</td></tr>";
if( rs.getInt("isleaf") != 0){
Tree(conn,rs.getInt("id"),1);
}
}
rs.close();
smt.close();
conn.close();
%>
<%!
String str="";
private void Tree(Connection conn,int id,int level) {
String preString = "";
Statement stm = null;
ResultSet rs = null;
for(int i=0;i<level;i++){
preString += "----";
}
try{
stm = conn.createStatement();
rs = stm.executeQuery("select * from article where pid="+ id );
while(rs.next()){
str += "<tr><td>" + rs.getInt("id") + "</td><td>" +
preString + "<a href='ArticleDetail.jsp?id=" + rs.getInt("id") + "'>"
+ rs.getString("title") + "</a></td>"+ "<td>" + "<a href='Delete.jsp?id=" +
rs.getInt("id") + "'>" + "删除</a>"+ "</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(stm != null){
stm.close();
stm = null;
}
}catch(SQLException e){
e.printStackTrace();
}
}
}
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>论坛的树状结构</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body>
This is my BBS page. <br>
<table border="1">
<%= str %>
</table>
</body>
</html>
//ArticleDetail.jsp
<%@ page language="java" contentType="text/html;charset=gbk" pageEncoding="gbk"%>
<%@ page import=" java.sql.* " %>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
String paraId=request.getParameter("id");
int id = Integer.parseInt(paraId);
Class.forName("com.mysql.jdbc.Driver");
String url = "jdbc:mysql://localhost:3306/bbs?user=root&password=root";
Connection conn = DriverManager.getConnection(url);
Statement smt = conn.createStatement();
ResultSet rs = smt.executeQuery("select * from article where id=" + id);
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>主题的标题和内容</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body>
<%
if( rs.next() ) {
%>
<table border=1>
<tr>
<td>ID</td>
<td><%= rs.getInt("id") %></td>
</tr>
<tr>
<td>Title</td>
<td><%= rs.getString("title") %></td>
</tr>
<tr>
<td>Cont</td>
<td><%=rs.getString("Cont")%></td>
</tr>
</table>
<a href="Reply.jsp?id=<%=rs.getInt("id") %>&rootid=<%=rs.getInt("rootid") %>">回复</a>
<a href="Delete.jsp?id=<%=rs.getInt("id") %>">删除</a>
<% } %>
<%
rs.close();
smt.close();
rs.close();
%>
</body>
</html>
//Delete.jsp
<%@ page language="java" contentType="text/html;charset=GB2312" pageEncoding="GB2312"%>
<%@ page import="java.sql.*" %>
<%!
private void delete(Connection conn,int id) {
Statement stm = null;
ResultSet rs = null;
try{
stm = conn.createStatement();
String sql = "select * from article where pid=" + id;
rs = stm.executeQuery(sql);
while( rs.next() ) {
delete(conn , rs.getInt("id") );
}
stm.executeUpdate("delete from article where id=" + id);
}catch(SQLException e){
e.printStackTrace();
}finally{
try {
if( rs != null) {
rs.close();
rs = null;
}
if( stm != null ) {
stm.close();
stm = null;
}
}catch(SQLException e){
e.printStackTrace();
}
}
}
%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
int id = Integer.parseInt(request.getParameter("id"));
int pid = Integer.parseInt(request.getParameter("pid"));
Class.forName("com.mysql.jdbc.Driver");
String url = "jdbc:mysql://localhost:3306/bbs?user=root&password=root";
Connection conn = DriverManager.getConnection(url);
conn.setAutoCommit(false);
delete(conn,id);
conn.commit();
conn.setAutoCommit(true);
String sql = "select count(*) from article where pid=" + pid;
Statement stm1 = conn.createStatement();
ResultSet rs = stm1.executeQuery(sql);
rs.next();
int count = rs.getInt(1);
if(count <=0 ) {
stm1.executeUpdate("update article set isleaf=0 where id=" + pid);
}
rs.close();
stm1.close();
conn.close();
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'Delete.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body>
<% response.sendRedirect("ShowArticleTree.jsp"); %>
</body>
</html>
//Reply.jsp
<%@ page language="java" contentType="text/html; charset=GB2312"
pageEncoding="GB2312"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
int id = Integer.parseInt(request.getParameter("id"));
int rootid = Integer.parseInt(request.getParameter("rootid"));
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>回复页面</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body>
<form action="ReplyOk.jsp">
<input type="hidden" name="id" value="<%=id %>" />
<input type="hidden" name="rootid" value="<%=rootid %>" />
<input type="hidden" name="testString" value="回答是开放" />
<table border="1">
<tr>
<td><input type="text" name="title" size="80" /></td>
</tr>
<tr>
<td><textarea rows="15" cols="80" name="cont"></textarea></td>
</tr>
<tr>
<td><input type="submit" value="回复" /></td>
</tr>
</table>
</form>
</body>
</html>
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