struts2中action实现ModelDriven后无法返回json的解决方法

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public class DeviceAction extends AbstractAction implements ModelDriven<Device> {
    private static Log log = LogFactory.getLog(DeviceAction.class);
    private Device device=new Device(); //只能json化 模型驱动的bean
    private String result; //无法返回reslut的json值

    
    public String getResult(){
        return result;
    }
    public void setResult(String result){
        this.result=result
    }
    public DeviceDTO getModel() {
        return device;
    }
    public Device getDevice() {
        return device;
    }
    public void setDevice(Device device) {
        this.device = device;
    }
}             

xml配置:

复制代码代码如下:

<action name="queryPu"
            class="com.jxj.bss.web.actions.DeviceAction"
            method="queryPu">
            <interceptor-ref name="isLogin"></interceptor-ref>
            <result type="json">
                <param name="includeProperties">
                    resultCode
                </param>
            </result>
        </action>

解决办法:

复制代码代码如下:

<action name="queryPu"
            class="com.jxj.bss.web.actions.DeviceAction"
            method="queryPu">
            <interceptor-ref name="isLogin"></interceptor-ref>
            <result type="json">
                <param name="root">action</param>
                <param name="includeProperties">
                    resultCode
                </param>
            </result>
        </action>