使用NVelocity0.5实现服务器端页面自动生成
地球人都知道，静态HTML页面通常会比服务器端页面如asp、aspx页面要来的快，即使这些页面没有服务器端代码。
另外要命的是，这些页面在主流的搜索引擎能中最为吃香，和那些aspx还带几个尾巴参数的页面比起来，真是天上地下。
如果那天老板发现这个问题，叫你把辛辛苦苦实现的服务器端程序向静态HTML页面靠拢，你会做何感想？
有一种URL重写的方案可以实现对搜索引擎的欺骗，除了这种方法，自动生成静态HTML页面应该是最彻底的方法了。
言归正传，开始介绍如何实现吧
1. 引用Nvelocity0.5，记得是0.5哦，NVelocity0.4我试过好久，好像不行，好像和路径有关系。
2、引用一些需要的命名空间
using
NVelocity;
using
NVelocity.App;
using
NVelocity.Exception;
using
NVelocity.Runtime;
using
NVelocityTemplateEngine;
using
NVelocityTemplateEngine.Interfaces;
3、初始化一些变量来使用
INVelocityEngine fileEngine;
IDictionary context;
///
<summary>
///
初始化NVelocity模板引擎并加载程序的配置信息ｅ
///
</summary>
protected
void
InitTemplateEngine()
{
context
=
new
Hashtable();
string
templateDirectory
=
Path.Combine(AppDomain.CurrentDomain.BaseDirectory,
"
Articles
"
);
fileEngine
=
NVelocityEngineFactory.CreateNVelocityFileEngine(templateDirectory,
true
);
}
4、页面生成代码
public
override
void
Execute()
{
string
message
=
string
.Format(
"
Create the Helper class file.
"
);
log.Debug(message);
string
sql
=
string
.Format(
"
select * from article
"
);
if
(
!
isCreateAll)
{
sql
=
string
.Format(
"
select * from article where generated =False
"
);
}
using
(IDataReader reader
=
xConfig.ExecuteReader(sql))
{
while
(reader.Read())
{
PrepareClass(reader);
OutputFile();
}
}
sql
=
"
update article set generated =True
"
;
if
(
!
isCreateAll)
{
sql
=
"
update article set generated =True where generated =False
"
;
}
xConfig.ExecuteNonQuery(sql);
}
///
<summary>
///
Prepares the class content.
///
</summary>
private
void
PrepareClass(IDataReader reader)
{
FileNameOfOutput
=
string
.Format(
"
{0}#{1}
"
, ((DateTime) reader[
"
datetime
"
]).ToString(
"
yyyy-MM-dd
"
), reader[
"
id
"
].ToString());
context.Clear();
context.Add(
"
id
"
, reader[
"
id
"
].ToString());
context.Add(
"
category
"
, reader[
"
category
"
].ToString());
context.Add(
"
title
"
, reader[
"
title
"
].ToString());
context.Add(
"
content
"
, reader[
"
content
"
].ToString());
context.Add(
"
datetime
"
, reader[
"
datetime
"
].ToString());
}
///
<summary>
///
根据模板创建输出的文件
///
</summary>
public
virtual
void
OutputFile()
{
if
(fileEngine
!=
null
)
{
string
filePath
=
Path.Combine(AppDomain.CurrentDomain.BaseDirectory, directoryOfOutput);
string
fileName
=
Path.Combine(filePath, fileNameOfOutput
+
fileExtension);
DirectoryInfo dir
=
new
DirectoryInfo(filePath);
if
(
!
dir.Exists)
{
dir.Create();
}
log.Debug(
string
.Format(
"
Class file output path:{0}
"
, fileName));
using
(StreamWriter writer
=
new
StreamWriter(fileName,
false
))
{
fileEngine.Process(context, writer,
this
.templateFile);
}
}
}
5、界面层生成页面
string
template
=
"
page.htm
"
;
try
{
HelperClassAdapter helper
=
new
HelperClassAdapter(template,
false
);
helper.Execute();
Response.Write(
"
<script>alert('生成成功');</script>
"
);
}
catch
(Exception ex)
{
Helper.ShowError(
this
, ex,
false
);
return
;
}
页面生成就可以了，具体做法自己琢磨就可以了。
页面模板文件
<
HTML
>
<
HEAD
>
<
TITLE
>
$title
</
TITLE
>
<
META
http-equiv
=Content-Type
content
="text/html; charset=UTF-8"
>
<
META
content
="$title"
name
=description
>
<
META
content
="$title"
name
=keywords
>
</
HEAD
>
<
BODY
>
<
strong
class
="style3"
>
$title
</
strong
></
h2
>
<
div
>
$content
</
div
>
<
hr
width
="98%"
/>
<
div
align
="right"
>
$datetime
</
div
>
</
BODY
>
</
HTML
>