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如何使用JSP+MySQL創建留言本(三)

編輯：關於JSP

下面我們開始建立留言的頁面！
<%@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) {}//轉換為可以加入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數據庫</title>
</head>

<body>

<p align="center"><center><font style="COLOR: blue; FONT-FAMILY: 方正舒體,華文行楷,隸書,宋體; 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="";
此處我調用了一個對留言進行合法檢驗的類
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) //留言中沒有錯誤,寫數據庫
try {//寫數據庫成功
  java.sql.Connection sqlConn; //數據庫連接對象
  java.sql.Statement sqlStmt; //語句對象
  java.sql.ResultSet sqlRst; //結果集對象
  //登記JDBC驅動對象
  Class.forName ("org.gjt.mm.mysql.Driver").newInstance ();
  //連接數據庫
  sqlConn= java.sql.DriverManager.getConnection ("jdbc:mysql://localhost/pinghui","test","");
  //創建語句對象
  sqlStmt=sqlConn.createStatement (java.sql.ResultSet.TYPE_SCROLL_INSENSITIVE,java.sql.ResultSet.CONCUR_READ_ONLY);
  //執行Sql語句
此處調用了一個對留言進行處理的類，是留言能被Mysql承認,
  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); //向數據庫中加入數據
   sqlRst.close();//關閉結果集對象
  sqlStmt.close ();//關閉語句對象
  sqlConn.close(); //關閉數據庫連接
  out.print (time);

%>
<font size="5" face="華文行楷">留言成功,謝謝!</font>
<table border="0" cellpadding="0" cellspacing="0" width="100%">
<tbody>
  <tr>
   <td width="25%">昵稱：<%=username%></td>
   <td width="25%">性別：<%=sex%></td>
   <td colspan="2" width="50%">地址：<%=address %></td>
  </tr>
  <tr>
   <td width="25%">電話：<%=telnumber%></td>
   <td width="25%">郵編：<%=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="寫信給留言者"></a></td>
   <td colspan="2" width="50%">網址：<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%">（來自</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) //寫數據庫失敗
{ out.print ("<font color=red>留言失敗</font>");
  out.print (MyQuery);
  out.print (userid);
}
else
{
  out.print ("<font color=red>總共有"+testcomment.ErrorCount+"條錯誤數據,請修改!</font>");
%>

<script language="JavaScript">

<table>
<tr>
  <td>
   <table cellspacing="0" cellpadding="0">
    <tr>
     <td>
      <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%">昵稱：<input name="name" size="20" value="<%if (username != null) out.print (username);%>"><%=testcomment.Comment_Er("username")%></td>
         <td nowrap width="40%">性別：<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>電話：<input name="telphone" size="15" value="<%if(telnumber!=null)out.print(telnumber);%>"><%=testcomment.Comment_Er("tel")%></td>
         <td>郵編：<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">網址：<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="確定" ?></td>
         <td align="left"><input name="r" type="reset" value="重置"></td>
        </tr>
       </table>
      </form>
      
     </td>
     <td><%=testcomment.Comment_Er("comment")%>請注意：你所輸入的內容中，昵稱和留言為必須輸入的項目！<br>
      不支持html標志</td>
    </tr>
   </table>
  </td>
</tr>
</table>
<%
}
%>
</body>

關於JSP