一般都是用註解@responsebody
但是若方法返回類型限制爲ModelAndView時就要這樣寫了
import org.springframework.web.servlet.view.json.MappingJackson2JsonView;
public ModelAndView resolveException(HttpServletRequest request,
HttpServletResponse response, Object object, Exception exception) {
ModelAndView mav = new ModelAndView();
MappingJackson2JsonView view = new MappingJackson2JsonView();
Map attributes = new HashMap();
attributes.put("success", Boolean.TRUE);
attributes.put("contractNo", "contractNo");
view.setAttributesMap(attributes);
mav.setView(view);
return mav;
}
這樣寫是可以通過的,以後在研究原理,先記下。
返回錯誤
public ModelAndView resolveException(HttpServletRequest request,
HttpServletResponse response, Object object, Exception exception) {
//是否爲ajax請求
String requestType = request.getHeader("X-Requested-With");
if(exception instanceof AuthorizationException){
response.setStatus(413);//無權限異常 主要用於ajax請求返回
response.addHeader("Error-Json", "{\"code\":413,\"msg\":\"nopermission\"}");
response.setContentType("text/html;charset=utf-8");
if("XMLHttpRequest".equals(requestType)){
return new ModelAndView();
}
return new ModelAndView("redirect:/html/413.html");
}
return null;
}
}
這裏返回http錯誤碼和錯誤信息Error-Json在responseHeader裏,在前端js可以使用getResponseHeader('Error-Json'))獲得返回的錯誤消息。