下面我们开始建立留言的页面！
<%@page
import ="java.util.*"
import ="java.text.*"
import="java.sql.*"
import ="java.io.*"
import ="java.lang.*"
contentType="text/html; charset=gb2312"
%>
<%
class CommentError// throws java.lang.NullPointerException
{ public String Username="",Sex="",Address="",Postal="",Oicq="",Icq="",Tel="",Comment="";
public boolean NoError=true;//false;
public int ErrorCount=0;
private boolean IsNumber(String s1) {}
public String font (String se) {}
public String Comment_Er(String se) {}
public void Username (String se) {}
public void Sex (String se) {}
public void Address (String se) {}
public void Comment (String se) {}
public void Tel (String se) {}
public void Postal (String se) {}
public void Oicq (String se) {}
public void Icq (String se) {}
}
class FormatComment
{ public String Replace(String source, String oldString, String newString) {}
public String formatint(String se) {}
public String fromatcomment(String se) {}
public String toHtmlInput(String str) {}
public String toHtml(String str) {}
public String toSql(String str) {}//转换为可以加入Myqal的格式
}
%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<meta name="GENERATOR" content="Microsoft FrontPage 4.0">
<meta name="ProgId" content="FrontPage.Editor.Document">
<title>使用MYsql数据库</title>
</head>
<body>
<p align="center"><center><font style="COLOR: blue; FONT-FAMILY: 方正舒体,华文行楷,隶书,宋体; FONT-SIZE: 16pt">萍慧jsp留言薄</font></center></p>
<p align="center">
<%! String username,sex,address,post,oicq,icq,telnumber,comment,email,url.urltitle;
%>
<%
try{ username=request.getParameter("name");
}catch (NullPointerException e){ username="";}
try{ comment=request.getParameter("comment");
}catch (NullPointerException e){ comment="";}
try{ sex=request.getParameter("sex");
}catch (NullPointerException e){ sex="";}
try{ address=request.getParameter("address");
}catch (NullPointerException e){ address="";}
try{ post=request.getParameter("postal");
}catch (NullPointerException e){ post="";}
try{ oicq=request.getParameter("oicq");
}catch (NullPointerException e){ oicq="";}
try{ icq=request.getParameter("icq");
}catch (NullPointerException e){ icq="";}
try{ telnumber=request.getParameter("telphone");
}catch (NullPointerException e) { telnumber= ""; }
try{ email=request.getParameter("email");
}catch (NullPointerException e) { email= ""; }
try{ url=request.getParameter("url");
}catch (NullPointerException e) { url= ""; }
try{ urltitle=request.getParameter("urltitle");
}catch (NullPointerException e) { urltitle= ""; }
String ip=request.getRemoteAddr();//得到IP地址
String time=(new SimpleDateFormat ("yyyy-MM-dd hh:mm:ss", Locale.US )).format(new java.util.Date());
String userid="";
String MyQuery="";
此处我调用了一个对留言进行合法检验的类
CommentError testcomment= new CommentError();
testcomment.Username(username);
testcomment.Postal (post);
testcomment.Sex(sex);
testcomment.Address(address);
testcomment.Tel(telnumber);
testcomment.Comment(comment);
testcomment.Oicq(oicq);
testcomment.Icq(icq);
if (testcomment.NoError) //留言中没有错误,写数据库
try {//写数据库成功
java.sql.Connection sqlConn; //数据库连接对象
java.sql.Statement sqlStmt; //语句对象
java.sql.ResultSet sqlRst; //结果集对象
//登记JDBC驱动对象
Class.forName ("org.gjt.mm.mysql.Driver").newInstance ();
//连接数据库
sqlConn= java.sql.DriverManager.getConnection ("jdbc:mysql://localhost/pinghui","test","");
//创建语句对象
sqlStmt=sqlConn.createStatement (java.sql.ResultSet.TYPE_SCROLL_INSENSITIVE,java.sql.ResultSet.CONCUR_READ_ONLY);
//执行Sql语句
此处调用了一个对留言进行处理的类，是留言能被Mysql承认,
FormatComment FC= new FormatComment();
oicq=FC.formatint(oicq);
icq=FC.formatint(icq);
post=FC.formatint(post);
telnumber=FC.formatint(telnumber);
username=FC.toSql(username);
comment=FC.toSql(comment);
MyQuery="insert into comment (username,sex,address,ip,post,oicq,icq,telnumber,comment,time,url,email) values ('"+username+"','"+sex+"','"+address+"','"+ip+"',"+post+","+oicq+","+icq+",'"+telnumber+"','"+comment+"',now(),'"+url+"','"+email+"');";
sqlRst=sqlStmt.executeQuery (MyQuery); //向数据库中加入数据
sqlRst.close();//关闭结果集对象
sqlStmt.close ();//关闭语句对象
sqlConn.close(); //关闭数据库连接
out.print (time);
%>
<font size="5" face="华文行楷">留言成功,谢谢!</font>
<table border="0" cellpadding="0" cellspacing="0" width="100%">
<tbody>
<tr>
<td width="25%">昵称：<%=username%></td>
<td width="25%">性别：<%=sex%></td>
<td colspan="2" width="50%">地址：<%=address %></td>
</tr>
<tr>
<td width="25%">电话：<%=telnumber%></td>
<td width="25%">邮编：<%=post%></td>
<td width="25%">OICQ：<%=oicq%></td>
<td width="25%">ICQ：<%=icq%></td>
</tr>
<tr>
<td colspan="2" width="50%">Email：<a href="mailto:" title="写信给留言者"></a></td>
<td colspan="2" width="50%">网址：<a href target="_blank"></a></td>
</tr>
<tr>
<td colspan="4"><font style="COLOR: green; LINE-HEIGHT: 150%">留言：</font><%=comment%><font style="COLOR: green; LINE-HEIGHT: 150%"><br>
-</font><%=time %><font style="COLOR: green; LINE-HEIGHT: 150%">（来自</font><%=ip %><font style="COLOR: green; LINE-HEIGHT: 150%">）</font></td>
</tr>
</tbody>
</table>
<hr color="#0080c0" noshade size="1" width="100%">
<%
} catch (SQLException e) //写数据库失败
{ out.print ("<font color=red>留言失败</font>");
out.print (MyQuery);
out.print (userid);
}
else
{
out.print ("<font color=red>总共有"+testcomment.ErrorCount+"条错误数据,请修改!</font>");
%>
<script language="JavaScript">
<!--
function test_comments(theForm)
{
if (theForm.name.value == "")
{ alert("姓名不能为空！：-）");
theForm.name.focus();
return (false);
}
if (theForm.name.value.length > 12)
{ alert("姓名太长，不能多于12个字符(既六个汉字)！");
theForm.name.focus();
return (false);
}
if (theForm.address.value.length > 40)
{ alert("地址太长，不能多于40个字符(20个汉字)！");
theForm.name.focus();
return (false);
}
if (theForm.comment.value == "")
{ alert("抱歉，留言不能为空!你必须输入留言");
theForm.comment.focus();
return (false);
}
if (theForm.comment.value.length > 1000)
{ alert("抱歉，你的留言太长，最多为1000个字符！");
theForm.comment.focus();
return (false);
}
return (true);
} -->
<table>
<tr>
<td>
<table cellspacing="0" cellpadding="0">
<tr>
<td><!--表单开始-->
<form action="addmysql.jsp" method="POST" name="all_comments" onsubmit="javascript:return (test_comments(this))">
<table border="0" width="100%" cellspacing="0" cellpadding="0">
<tr>
<td width="60%">昵 称：<input name="name" size="20" value="<%if (username != null) out.print (username);%>"><%=testcomment.Comment_Er("username")%></td>
<td nowrap width="40%">性 别：<select name="sex" size="1">
<option selected value="男" <%if(sex=="男") out.print ("select"); %>>男</option>
<option value="女" <%if(sex=="女") out.print ("select"); %>>女</option>
<option value="保密" <%if(sex=="保密") out.print ("select"); %>>保密</option>
</select><%=testcomment.Comment_Er("sex")%></td>
</tr>
<tr>
<td colspan="2">地 址：<input name="address" size="40" value="<%if (address!=null) out.print(address);%>"><%=testcomment.Comment_Er("address")%></td>
</tr>
<tr>
<td>电 话：<input name="telphone" size="15" value="<%if(telnumber!=null)out.print(telnumber);%>"><%=testcomment.Comment_Er("tel")%></td>
<td>邮 编：<input name="postal" size="6" value="<%if(post!=null) out.print(post);%>"><%=testcomment.Comment_Er("postal")%></td>
</tr>
<tr>
<td> OICQ：<input name="oicq" size="10" value="<%if(oicq!=null) out.print (oicq);%>"><%=testcomment.Comment_Er("oicq")%></td>
<td> ICQ ：<input name="icq" size="15" value="<%if(icq!=null)out.print(icq);%>"><%=testcomment.Comment_Er("icq")%></td>
</tr>
<tr>
<td colspan="2">Email：<input name="email" size="25" value="<%if(email!=null) out.print(email);%>"><%//=testcomment.Comment_Er("")%></td>
</tr>
<tr>
<td colspan="2">网 址：<input name="url" size="40" value="<%if(url!=null)out.print(url);%>"><%//=testcomment.Comment_Er("")%></td>
</tr>
<tr>
<td colspan="2"><textarea cols="80" name="comment" rows="10" wrap="physical"><%if (comment!=null)out.print (comment);%></textarea>
<tr>
<td align="right"><input name="put_submit" type="submit" value="确定" ?></td>
<td align="left"><input name="r" type="reset" value="重置"></td>
</tr>
</table>
</form>
<!--提交表单结束-->
</td>
<td><%=testcomment.Comment_Er("comment")%>请注意：你所输入的内容中，昵称和留言为必须输入的项目！<br>
不支持html标志</td>
</tr>
</table>
</td>
</tr>
</table>
<%
}
%>
</body>