FreeMarker模板的使用

1.获取简单数据

使用EL表达式，${param}直接获取定义在freemarker中的简单数据

2.获取包装数据类型

${user.uName}直接获取定义在freemarker中包装数据类型数据

3.获取集合/数组数据类型

例子： List<User> userList=new ArrayList<User>(); <#list userList as user> ${user.uName} </#list>

4.获取当前迭代的索引

List<User> userList=new ArrayList<User>() <#list userList as user> ${user_index} </#list>

5.逻辑判断

<#if 判断条件> <#else> </#if> 逻辑运算符（== != || &&）

6.日期类型格式化

1：date类型 ${currTime?date} 2:datetime类型 ${currTime?datetime} 3:time类型 ${currTime?time} 4:自定义类型 ${currTime?string("yyyy-MM-dd HH:mm:ss")}

7.处理空值（null）

对于需要放入freemarker中的数据如果存在是null（空值）的情况 1.将空值变成空串 ${val!} //其实这里${val!"我是空串"} 2.采用默认值代替空值 ${val!"w我只默认值"} 3.通过条件判断，动态输出 <#if currTime ??> 当前日期:${currTime?string("yyyy/MM/dd HH:mm:ss")} <#else> currrTime属性为null </#if>

8.引入其他页面到本页面

<#include "/html/other.html">

FreeMarker和Spring框架的整合

1.引入freemarker的依赖

<!--freemarker的依赖--> <dependency> <groupId>org.freemarker</groupId> <artifactId>freemarker</artifactId> <version>2.3.28</version> </dependency> <!-- 需要包含Spring上下文的支持 --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context-support</artifactId> <version>4.1.3.RELEASE</version> </dependency>

2.在spring中配置freemarker

<!--freemarker for generator static page --> <bean name="freemarkerConfig" class="org.springframework.web.servlet.view.freemarker.FreeMarkerConfigurer"> <property name="templateLoaderPath" value="/WEB-INF/ftl/" /> <property name="defaultEncoding" value="UTF-8" /> </bean>

3.freemarker的使用

@Test public void testFreemarker() throws IOException, TemplateException { //freemarker proj no need to depend on web container,so that you can build a java file to run it //create configuration object for the freemarker Configuration config=new Configuration(Configuration.getVersion()); //tould the configuration where is the ftl template files config.setDirectoryForTemplateLoading(new File("D:\\Myself\\ftl")); //set encoding config.setDefaultEncoding("UTF-8"); //specify the file name of the template file Template template = config.getTemplate("first.ftl"); //create the template file's data list Map dataList=new HashMap<>(); dataList.put("firstTitle", "FirstFreemarker"); dataList.put("welcome", "Hello Freemarker"); //create a write object to specify file path for the generated file Writer writer=new FileWriter(new File("D:\\Myself\\Html\\hello.html")); //call the template object process function and to params is need template.process(dataList, writer); //flush the data steam and close writer steam writer.flush(); writer.close(); }