freemarker整合springMVC报错如下：
警告: Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘freemarkerConfig’ defined in class path resource [springmvc.xml]: Invocation of init method failed; nested exception is java.lang.NoSuchFieldError: DEFAULT_INCOMPATIBLE_IMPROVEMENTS
原因：freemarker版本过老
解决方法：使用最新版本

支持多种格式页面：jsp/html

  1. <!-- 视图解析器1:html视图解析器 必须先配置freemarkerConfig,注意html是没有prefix前缀属性的 -->
  2.     <bean id="freemarkerConfig"
  3.         class="org.springframework.web.servlet.view.freemarker.FreeMarkerConfigurer">
  4.         <property name="freemarkerSettings">
  5.             <bean
  6.                 class="org.springframework.beans.factory.config.PropertiesFactoryBean">
  7.                 <property name="properties">
  8.                     <props>
  9.                         <prop key="default_encoding">utf-8</prop>
  10.                         <prop key="output_encoding">utf-8</prop>
  11.                     </props>
  12.                 </property>
  13.             </bean>
  14.         </property>
  15.         <property name="templateLoaderPath">
  16.             <value>/WEB-INF/views/</value>
  17.         </property>
  18.     </bean>
  19.     <bean id="htmlviewResolver"
  20.         class="org.springframework.web.servlet.view.freemarker.FreeMarkerViewResolver"
  21.         p:suffix=".html" p:order="0">
  22.         <property name="contentType" value="text/html;charset=UTF-8" />
  23.     </bean>
  24.     <!-- 视图解析器2:jsp视图解析器 -->
  25.     <bean id="jspviewResolver"
  26.         class="org.springframework.web.servlet.view.InternalResourceViewResolver"
  27.         p:prefix="/WEB-INF/views/" p:suffix=".jsp" p:order="1">
  28.         <property name="contentType" value="text/html;charset=UTF-8" />
  29.     </bean>