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1、C# MVC学习之NVelocity基本使用

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 == "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);

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

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原文地址：https://www.cnblogs.com/lastcode/p/4855331.html