NVelocity基本使用

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夾
                vltEngine.Init();

                VelocityContext vltContext = new VelocityContext();
                vltContext.Put("username", "");//設置參數，在模板中可以通過$data來引用
                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);
             }