freemarker

一、java 代码 @Test public void testFreeMarker() throws Exception { //1、创建一个模板文件 //2、创建一个Configuration对象 Configuration configuration = new Configuration(); //3、设置模板文件保存的目录 configuration.setDirectoryForTemplateLoading(new File("E:/workspaces/fw-item-web/src/main/webapp/WEB-INF/ftl")); //4、模板文件的编码格式，一般就是utf-8 configuration.setDefaultEncoding("utf-8"); //5、加载一个模板文件，创建一个模板对象。 Template template = configuration.getTemplate("testNull.ftl"); //6、创建一个数据集。可以是pojo也可以是map。推荐使用map Map data = new HashMap<>(); //添加 null 值 data.put("val", null); //7、创建一个Writer对象，指定输出文件的路径及文件名。 Writer out = new FileWriter(new File

1. freemarker不支持null。 如果值为null会报错。 2.当值为null的处理 1）过滤不显示 Hello ${name!} 在属性后面加感叹号即可过滤null和空字符串 if和”？？“ <#if age??> 无年龄值 <#/if> $和！ ${age!'0'} 如果age为null，默认给'0' 2）设置默认值 如${student1.user!"null"} 3）判断是否存在值 $stduent.user?if_exists} 这样显示就没有问题了 if判断null处理 ========================================================================= freemarker对null的处理 无非就这几种 1 提供默认值 <#if mouse?> Mouse found <#else> 也可以直接${mouse?if_exists} <#if user.age??> //TO DO </#if> 2.忽略null值 假设前提：userName为null ${userName} error ${userName!} 空白 ${userName!'tivon'} tivon 假设前提：user.name为null ${user.name}，异常 ${(user.name)!},显示空白 ${user

以下引用官方描述： ? The FreeMarker template language doesn't know the Java language null at all. It doesn't have null keyword, and it can't test if something is null or not. 　　 1.判断是否存在,通过exists关键字或者"??"运算符。都将返回一个布尔值 user.name?exists user.name?? ? <# if user.name?exists> //TO DO </# if > <# if user.age??> //TO DO </# if > 　　 2.忽略null值 假设前提：user.name为null ${user.name}，异常 ${user.name!},显示空白 ${user.name!'vakin'}，若user.name不为空则显示本身的值，否则显示vakin ${user.name?default('vakin')}，同上 ${user.name???string(user.name,'vakin')},同上 以下引用官方描述： ? The FreeMarker template language doesn't know the Java language null at all

I have a resource that is a . This means my url looks like this: http://myapp/index/ . And i need to add query parameters so that it looks like this: http://myapp/index/.?type=xml I use Freemarker for the presentation of my resources and made a percent-encoding hack for this case: <#if key?matches("\\.")> <li><a href="${contextPath}/index/%2E">${key}</a></li> </#if> This works fine for Firefox. But all other Browsers like IE, Safari, Chrom, Opera just ignore my url encoded dot ( http://myapp/index/%2E ). Any suggestions? It's actually not really clearly stated in the standard ( RFC 3986 )

前言： 为什么要用模板？有了JSTL，还需要freemarker吗？ 模板技术与容器无关，同样可以应用于非Web应用程序环境。ftl文件改动之后是不需要编译的，这点不同于Jsp 。JSTL只能用在jsp中，修改了jsp，需要重新编译，从而使用模板更有效率。 一、上手实例 1. 在WEB-INF/lib中放置freemarker.jar，新建一个Servlet，Hello.java Java代码 package com.fbysss.test.servlet; import java.io.IOException; import java.io.Writer; import java.util.HashMap; import java.util.Map; import javax.servlet.ServletException; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import freemarker.core.Environment; import freemarker.template.Configuration; import freemarker.template.Template; import freemarker

Freemarker has two collection datatypes, lists and hashmaps Is there a way to iterate over hashmap keys just as we do with lists? So if I have a var with data lets say: user : { name : "user" email : "looser@everything.com" homepage : "http://nosuchpage.org" } I would like to print all the user's properties with their value. This is invalid, but the goal is clear: <#list user.props() as prop> ${prop} = ${user.get(prop)} </#list> skaffman Edit: Don't use this solution with FreeMarker 2.3.25 and up, especially not .get(prop) . See other answers. You use the built-in keys function, e.g. this