Struts集成velocity

需要lib
velocity-1.4.jar，
velocity-tools-1.2.jar
copy to /WEB-INF/lib目录下
修改web.xml
<servlet>
  <servlet-name>action</servlet-name>
  <servlet-class>org.apache.struts.action.ActionServlet</servlet-class>
  <init-param>
   <param-name>config</param-name>
   <param-value>/WEB-INF/struts-config.xml</param-value>
  </init-param>
</servlet>
<servlet>
    <servlet-name>velocity</servlet-name>    <servlet-class>org.apache.velocity.tools.view.servlet.VelocityViewServlet</servlet-class>
    <init-param>
      <param-name>org.apache.velocity.properties</param-name>      <param-value>/WEB-INF/properties/velocity.properties</param-value>
    </init-param>
</servlet>
<!-- Action Servlet Mapping -->
<servlet-mapping>
  <servlet-name>action</servlet-name>
  <url-pattern>*.do</url-pattern>
</servlet-mapping>
<servlet-mapping>
    <servlet-name>velocity</servlet-name>
    <url-pattern>*.vm</url-pattern>
</servlet-mapping>
加了红色部分。
新建velocity属性文件（velocity.properties），内容如下
#  the following are specified relative to the
#  root of the webapp because the
#  ControllerServlet will setup these
#  properties with the right real path
#  prepended
#
file.resource.loader.path=/vm
runtime.log=${bluetop.root}/logs/velocity.log
#encodeing
input.encoding = GBK
output.encoding = GBK
写一test class文件
public class VelocityTest extends BaseAction {

/* (non-Javadoc)
* @see com.bluetop.web.action.BaseAction#executeAction(org.apache.struts.action.ActionForm, javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
*/
@Override
public String executeAction(ActionForm actionFrom,
HttpServletRequest request, HttpServletResponse response)
throws Exception {
List<String> list = new ArrayList<String>();

        list.add("velocity测试");
        list.add("velocity测试 element 2");
        list.add("velocity测试 element 3");
        list.add("velocity测试 element 4");
        request.setAttribute("list", list);
return "example";
}

}
配置struts-config.xml
<action path="/vtest" scope="request" type="com.bluetop.demo.VelocityTest">
      <forward name="example" path="/vm/example.vm"/>
  </action>
新建example.vm
## This is an example velocity template

#set( $this = "Velocity")

$this is great!

#foreach( $name in $list )
    $name is great!
#end

#set( $condition = true)

#if ($condition)
    The condition is true!
#else
    The condition is false!
#end   

执行/vtest.do输出内容如下：
Velocity is great! velocity测试 is great! velocity测试 element 2 is great! velocity测试 element 3 is great! velocity测试 element 4 is great! The condition is true!

Velocity工作正常，over