list数据:<#list persons as person>

  ${person.name}--${person.age}--${person.sex}<br/>  </#list>

页面已经生成,但是报错

freemarker.core.InvalidReferenceException: Expression persons is undefined on line 6, column 23 in WEB-INF/ftl/index.ftl.

    freemarker.core.TemplateObject.assertNonNull(TemplateObject.java:124)     freemarker.core.IteratorBlock.accept(IteratorBlock.java:100)     freemarker.core.Environment.visit(Environment.java:210)     freemarker.core.MixedContent.accept(MixedContent.java:92)     freemarker.core.Environment.visit(Environment.java:210)     freemarker.core.Environment.process(Environment.java:190)     freemarker.template.Template.process(Template.java:237)     org.apache.struts2.views.freemarker.FreemarkerResult.doExecute(FreemarkerResult.java:202)     org.apache.struts2.dispatcher.StrutsResultSupport.execute(StrutsResultSupport.java:186)     com.opensymphony.xwork2.DefaultActionInvocation.executeResult(DefaultActionInvocation.java:373)     com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:277)     com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:176)   

解决办法: 这是因为模板里要输出的对象是空的,所以报错.解决办法就是在输出之前判断下就可以了

 list数据:

 <#if persons ??>

<#list persons as person>

  ${person.name}--${person.age}--${person.sex}<br/>  </#list>

 </#if>