从Spring MVC Controller返回JSON或View


问题内容

我想根据逻辑从Spring MVC控制器返回一个视图。如果发生错误,我想返回JSON,否则返回HTML视图。就像ASP.NET MVC
ActionResult一样,您可以在其中返回任何类型的视图,并且它将呈现结果,并且它不依赖于请求中发送的内容类型。我找不到任何示例。


问题答案:

我通过以下方法实现了这一目标。

@RequestMapping(value="/users", method=RequestMethod.POST)
public Object index(@RequestBody SearchUsersViewModel model, HttpServletResponse response) {

    model.setList(userService.getUsers(model));

    if(true)
    {
        return new ModelAndView("controls/tables/users", "model", model);
    }
    else
    {
        return JsonView.Render(model, response);
    }    
}

JsonView.java

public class JsonView {

    public static ModelAndView Render(Object model, HttpServletResponse response)
    {
        MappingJacksonHttpMessageConverter jsonConverter = new MappingJacksonHttpMessageConverter();

        MediaType jsonMimeType = MediaType.APPLICATION_JSON;


        try {
            jsonConverter.write(model, jsonMimeType, new ServletServerHttpResponse(response));
        } catch (HttpMessageNotWritableException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

        return null;
    }
}

进行呼叫的JS函数

config.request = $
                .ajax({
                    url : url,
                    data : $.toJSON(def.data),
                    type : def.type,
                    dataType : def.dataType,
                    processData : true,
                    contentType : def.contentType,
                    success : function(data) {

                        try {
                            var json = data;
                            if (typeof data === "String" || typeof data == "string") {
                                json = (eval('(' + data + ')'));
                            }
                            if ('object' === typeof json) {
                                if (json.Validation && json.Validation.Errors.length > 0) {

                                    $.each(json.Validation.Errors, function() {
                                        // Error Code Check
                                    });

                                    // Error Callback
                                    if (typeof (def.errorCallback) == 'function') {
                                        def.errorCallback(json);
                                    }
                                } else {
                                    def.callback(data);
                                }
                            } else {
                                def.callback(data);
                            }
                        } catch (e) {
                            def.callback(data);
                            // Hide Loading
                        }
                    },
                    error : function(data) {


                    }
                });