struts中返回json

1.Struts的配置：

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd">
<struts>

<package name="default" extends="json-default">
<action name="aa" class="com......Action">
<result name="jsonMap" type="json">
<param name="root">pageMap</param>

<param name="excludeProperties">  
\[\d+\].account
</param>
</result>
</action>
</package>
</struts>    

2.action:

public class AAAction extends ActionSupport {

private Map<String, Object> pageMap = null;

public String execute(){
pageMap=new HashMap<String, Object>();
pageMap.put("Name", "测试json");
return "jsonMap";
return "fail";
}

public Map<String, Object> getPageMap() {
return pageMap;
}


}

3.返回

{"Name":"测试json"}