I am wanting to return a view from a Spring MVC Controller depending on logic. If an error occurs I want to return JSON, if not, an HTML view. This is like ASP.NET MVC ActionResult, where you can return any kind of view and it will render the result, and it won't depend on the content-type being sent in the request. I can't find any examples of this.
In this article I will explain with an example, how to use the JsonResult class object for returning JSON data from Controller to View in ASP.Net MVC. The Controller Action method will be called using jQuery POST function and JSON data will be returned back to the View using JsonResult class object.
The ActionResult is defined in the controller and the controller returns to the client (the browser). What is JsonResult ? JsonResult is one of the type of MVC action result type which returns the data back to the view or the browser in the form of JSON (JavaScript Object notation format).
I achieved this with the following.
@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;
}
}
JS Function that makes the call
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) {
}
});
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