1、C# MVC学习之NVelocity基本使用

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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，

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 == "")

                {

                    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 = ;

            Person dad = new Person();

            dad.Name = "张三的爹";

            dad.Age = ;

            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);

代码下载地址：http://download.csdn.net/detail/murongqingsi/9156661

NVelocity下载地址：http://download.csdn.net/detail/murongqingsi/9156623