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<H2 class=title><A
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<H3 class=title>注意</H3>
<P>将前九章的知识结合起来，实现一个电子留言板，包括注册登录，发帖回复功能。</P></DIV>
<P>如果你不满足以下任一条件，请继续阅读，否则请跳过此后的部分，进入下一章：<A class=xref
title=第 11 章 文件上传
href="第_11_章_文件上传.htm">第 11 章
<I>文件上传</I></A>。</P>
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<P>对电子留言板不感兴趣。</P></LI></OL></DIV></DIV>
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<H2 class=title style="CLEAR: both"><A
name=jsp-ch-10-01></A>10.1. 电子留言板用户指南</H2></DIV></DIV></DIV>
<P>首页显示的是主题列表。</P>
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<P>用户如果想发表新主题或者对主题进行回复，必须先注册为会员。</P>
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src="第_10_章_综合电子留言板.files/jsp-ch-10-01-guide-02.png"
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<P>注册后进入登录页面进行登录。</P>
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src="第_10_章_综合电子留言板.files/jsp-ch-10-01-guide-03.png"
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<P>登录后即出现在用户在线列表中。</P>
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<P>点击标题可以看到主题的详细信息。</P>
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<P>登录以后即可发布新主题。</P>
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src="第_10_章_综合电子留言板.files/jsp-ch-10-01-guide-06.png"
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<H2 class=title style="CLEAR: both"><A
name=jsp-ch-10-02></A>10.2. 数据库设计</H2></DIV></DIV></DIV>
<P>数据库er图</P>
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<P>共定义了三张表：</P>
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<P>user用户，保存注册用的信息。</P>
<LI>
<P>thread主题，用户发起的主题帖子，外键关联user，对应发表主题的用户</P>
<LI>
<P>comment回复，对主题帖子发起的回复，外键关联user和thread，对应发表回复的用户和回复的主题。</P></LI></OL></DIV>
<P>建表sql脚本放在10-01/WEB-INF/sql/import.sql。</P><PRE class=programlisting><SPAN class=hl-comment xmlns="http://www.w3.org/TR/xhtml1/transitional">-- 用户</SPAN>
<SPAN class=hl-keyword xmlns="http://www.w3.org/TR/xhtml1/transitional">create</SPAN> <SPAN class=hl-keyword xmlns="http://www.w3.org/TR/xhtml1/transitional">table</SPAN> user(
id <SPAN class=hl-keyword xmlns="http://www.w3.org/TR/xhtml1/transitional">bigint</SPAN>, <SPAN class=hl-comment xmlns="http://www.w3.org/TR/xhtml1/transitional">-- 主键</SPAN>
username <SPAN class=hl-keyword xmlns="http://www.w3.org/TR/xhtml1/transitional">varchar</SPAN>(100), <SPAN class=hl-comment xmlns="http://www.w3.org/TR/xhtml1/transitional">-- 帐号</SPAN>
password <SPAN class=hl-keyword xmlns="http://www.w3.org/TR/xhtml1/transitional">varchar</SPAN>(100), <SPAN class=hl-comment xmlns="http://www.w3.org/TR/xhtml1/transitional">-- 密码</SPAN>
reg_time datetime, <SPAN class=hl-comment xmlns="http://www.w3.org/TR/xhtml1/transitional">-- 注册时间</SPAN>
last_login datetime <SPAN class=hl-comment xmlns="http://www.w3.org/TR/xhtml1/transitional">-- 上次登录时间</SPAN>
);
<SPAN class=hl-comment xmlns="http://www.w3.org/TR/xhtml1/transitional">-- 主题</SPAN>
<SPAN class=hl-keyword xmlns="http://www.w3.org/TR/xhtml1/transitional">create</SPAN> <SPAN class=hl-keyword xmlns="http://www.w3.org/TR/xhtml1/transitional">table</SPAN> thread(
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