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小白一个，刚刚开始学，大神不要笑话。。。。。。
NVelocity是一个很容易上手的框架，从它开始学习，可以循序渐进
首先，创建空web应用程序，新建一般处理程序 Login2.ashx
然后，引入NVelocity，
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创建Html 页面login.htm，实现登录框架
NVelocity语法是$开头
<html> <head></head> <body> <strong><font color=‘green‘>登录</font></strong> <form action=‘Login2.ashx‘> <input type=‘text‘ name=‘username‘ value=‘$username‘/> <input type=‘password‘ name=‘password‘ value=‘$password‘ /> <input type=‘submit‘ value=‘登录‘/> </form> <p>$msg</p> </body> </html>
编写Login2.ashx.cs页面，使用NVelocity处理请求
public class Login2 : IHttpHandler { public void ProcessRequest(HttpContext context) { context.Response.ContentType = "text/html"; string username = context.Request["username"]; string password = context.Request["password"]; if (string.IsNullOrEmpty(username) && string.IsNullOrEmpty(password)) { VelocityEngine vltEngine = new VelocityEngine(); vltEngine.SetProperty(RuntimeConstants.RESOURCE_LOADER, "file"); vltEngine.SetProperty(RuntimeConstants.FILE_RESOURCE_LOADER_PATH, System.Web.Hosting.HostingEnvironment.MapPath("~/templates"));//模板文件所在的文件夹 vltEngine.Init(); VelocityContext vltContext = new VelocityContext(); vltContext.Put("username", "");//设置参数，在模板中可以通过$data来引用 vltContext.Put("password", ""); vltContext.Put("msg", ""); Template vltTemplate = vltEngine.GetTemplate("login.htm"); System.IO.StringWriter vltWriter = new System.IO.StringWriter(); vltTemplate.Merge(vltContext, vltWriter); string html = vltWriter.GetStringBuilder().ToString(); context.Response.Write(html); } else { if (username == "admin" && password == "123") { context.Response.Write("登录成功"); } else { VelocityEngine vltEngine = new VelocityEngine(); vltEngine.SetProperty(RuntimeConstants.RESOURCE_LOADER, "file"); vltEngine.SetProperty(RuntimeConstants.FILE_RESOURCE_LOADER_PATH, System.Web.Hosting.HostingEnvironment.MapPath("~/templates"));//模板文件所在的文件夹 vltEngine.Init(); VelocityContext vltContext = new VelocityContext(); vltContext.Put("username", username);//设置参数，在模板中可以通过$data来引用 vltContext.Put("password", password); vltContext.Put("msg", "用户名或者密码错误"); Template vltTemplate = vltEngine.GetTemplate("login.htm"); System.IO.StringWriter vltWriter = new System.IO.StringWriter(); vltTemplate.Merge(vltContext, vltWriter); string html = vltWriter.GetStringBuilder().ToString(); context.Response.Write(html); } } } public bool IsReusable { get { return false; } }
NVelocity的强大之处不仅仅这些，它还可以对 对象的属性进行赋值，看下面的例子
<html><head></head><body> $p.Name <p>我的老爹是 $p.Father.Name，他的年龄是$p.Father.Age </p> </body></html>
后台处理程序：
context.Response.ContentType = "text/html"; Person person = new Person(); person.Name = "张三"; person.Age = 30; Person dad = new Person(); dad.Name = "张三的爹"; dad.Age = 60; person.Father = dad; VelocityEngine vltEngine = new VelocityEngine(); vltEngine.SetProperty(RuntimeConstants.RESOURCE_LOADER, "file"); vltEngine.SetProperty(RuntimeConstants.FILE_RESOURCE_LOADER_PATH, System.Web.Hosting.HostingEnvironment.MapPath("~/templates"));//模板文件所在的文件夹 vltEngine.Init(); VelocityContext vltContext = new VelocityContext(); vltContext.Put("p", person);//设置参数，在模板中可以通过$data来引用 Template vltTemplate = vltEngine.GetTemplate("test.htm"); System.IO.StringWriter vltWriter = new System.IO.StringWriter(); vltTemplate.Merge(vltContext, vltWriter); string html = vltWriter.GetStringBuilder().ToString(); context.Response.Write(html);
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原文地址：http://www.cnblogs.com/lastcode/p/4855331.html
