Springmvc异常映射2种实现方法

<!--配置基于xml的异常映射-->
<bean id="simplemappingexceptionresolver" class="org.springframework.web.servlet.handler.simplemappingexceptionresolver">
  <!--配置异常和对应页面的映射-->
  <property name="exceptionmappings" >
    <props>
      <prop key="java.lang.exception">erroe</prop>
    </props>
  </property>
</bean>

@controlleradvice
public class exceptionresolver {
  @exceptionhandler(value = nullpointerexception.class)
public modelandview nullpointerexceptionresovler(nullpointerexception e, httpservletrequest request, httpservletresponse response) throws ioexception {
   string viewname="erroe";
    return commonreslover(viewname,response,request,e);
  }
  private modelandview commonreslover(string viewname,httpservletresponse response,httpservletrequest request,exception e) throws ioexception {
    boolean judgeresult = crowdutil.judgerequesttype(request);
    if(judgeresult){
      resultentity<object> resultentity=resultentity.failed(e.getmessage());
      //转成gson对象
      gson gson=new gson();
      response.getwriter().write(gson.tojson(resultentity));
      return null;
    }
    modelandview modelandview=new modelandview();
    modelandview.addobject("exception",e);
    modelandview.setviewname(viewname);
    return modelandview;
  }
}