struts2升级后引发的json问题

action配置，没有在struts.xml中，在web.xml
struts2
org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter
config
struts-default.xml,struts-plugin.xml,struts.xml
actionPackages

 com.report.user.action,
 com.report.sys.action,
 com.report.esdreport.action,
 com.report.actreport.action,
 com.report.feereport.action,
 com.report.sdmsreport.action,
 com.report.workrecord.action,
 com.report.reportcenter.action,
 com.report.chart.action,
 com.report.incident.action

</filter>
<filter-mapping>
    <filter-name>struts2</filter-name>
    <url-pattern>*.do</url-pattern>
</filter-mapping>
<filter-mapping>
    <filter-name>struts2</filter-name>
    <url-pattern>*.jsp</url-pattern>
</filter-mapping>