问题
See my following 4 simple examples, 2 works for xml, the other 2 does not.
//works for html, json, xml
@RequestMapping(value = "/test", method = RequestMethod.GET)
public ModelAndView testContentNegiotation(HttpServletRequest request, HttpServletResponse response) {
ModelAndView mav = new ModelAndView();
TestTO test = new TestTO("some msg", -888);
mav.addObject("test", test);
mav.setViewName("test"); //test is a jsp page
return mav;
}
//does not work for xml
@RequestMapping(value = "/test", method = RequestMethod.GET)
public ModelAndView testContentNegiotation(HttpServletRequest request, HttpServletResponse response) {
ModelAndView mav = new ModelAndView();
ErrorTO error = new ErrorTO("some error", -111);
mav.addObject("error",error );
TestTO test = new TestTO("some msg", -888);
mav.addObject("test", test);
mav.setViewName("test");
return mav;
}
//works for xml and json
@RequestMapping(value = "/test3", method = RequestMethod.GET)
public @ResponseBody ErrorTO test3(HttpServletRequest request, HttpServletResponse response) {
ErrorTO error = new ErrorTO();
error.setCode(-12345);
error.setMessage("this is a test error.");
return error;
}
//does not work for xml
@RequestMapping(value = "/testlist", method = RequestMethod.GET)
public @ResponseBody List<ErrorTO> testList2(HttpServletRequest request, HttpServletResponse response) {
ErrorTO error = new ErrorTO("an error", 1);
ErrorTO error2 = new ErrorTO("another error", 2);
ArrayList<ErrorTO> list = new ArrayList<ErrorTO>();
list.add(error);
list.add(error2);
return list;
}
In the two examples that can't produce xml, is it possible for configuring spring to make it work?
回答1:
The two examples that don't generate XML aren't working because you have multiple top-level objects in your model. XML has no way to represent that - you need a single model object that can then be converted into XML. Similarly, a bare list cannot be converted into XML by Spring MVC.
In both cases, you need to wrap the various model objects into a single root object, and add that to the model.
JSON, on the other hand, has no issue with representing multiple top-level objects in a single document.
来源：https://stackoverflow.com/questions/6446342/issues-with-xml-in-spring-mvc-3