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return new ModelAndView doesnt work

My controller :
#RequestMapping(value="/testAdmin", method = RequestMethod.POST,consumes = "application/json")
public ModelAndView testAdmin(#RequestBody Student student) {
System.out.println(student.getName()+" "+student.getId()+" "+student.getLogin()+" "+student.getPassword());
return new ModelAndView("showString","student",student.getName());
}
My ajax function:
function test2(a,ob) {
var student={
id:ob[a].id,
login:ob[a].login,
password:ob[a].password,
name:ob[a].name
}
$.ajax({
type: "POST",
contentType : 'application/json; charset=utf-8',
url: "testAdmin",
data: JSON.stringify(student),
success: function (response)
{
alert("success");
},
error : function(xhr, status, errorThrown) {
alert(status+" "+errorThrown.toString());
}
});
}
Controller method works, but it doesnt go to other page.
I dont know how to fix it, give an example or information to read

POSTing data return error instead of success

I am new to Spring MVC and I am trying to send my data to Spring-MVC Controller using AJAX, on button click. I have written this code (given below) but I am getting error instead of success. please tell what can be the issue?
AJAX:
function add() {
var name = $('#name').val();
$.ajax({
url : "/addUser",
data : name,
type : "POST",
async: false,
success : function(response) {
alert( response );
},
error : function() {
alert("error....");
}
});
}
JAVA
#RequestMapping(value = "/addUser", method = RequestMethod.POST)
public String addUser(#ModelAttribute("UserTest") String name) {
//task
return name;
}

I got 404 error after sending POST method from ajax (#ResponseStatus & ResponseEntity)

I ma using Spring MVC and trying to use jQuery. I have this on my web page:
$(document).ready(function () {
var entity = {mag: "status_key", paper: "View10"};
$("#btn").click(function () {
$.ajax({
url: "ajaxJsonPost",
type: 'post',
dataType: 'json',
data: JSON.stringify(entity),
contentType: 'application/json',
});
});
});
Spring server has this:
#RequestMapping(value = "ajaxJsonPost", method = RequestMethod.POST)
public void postJson(#RequestBody Entity en) throws IOException {
System.out.println("writing entity: " + en.toString());
}
OK, Entity cames to server. BUT browser console prints 404 not found. I know that my POST request needs any response. In the Internet I've found solution which recommends me to return ResponseEntity object, OR use annotation #ResponseStatus. They both return HttpStatus well, but I don't know in which cases I should use them. What is the best way?

#Controller
#RequestMapping("/apipath")
public class SomeController {
#RequestMapping(value = "/ajaxJsonPost", method = RequestMethod.POST, consumes = MediaType.APPLICATION_JSON_VALUE)
#ResponseBody
public String postJson(#RequestBody final Entity en) {
System.out.println(en.toString());
//assuming you have a class "EntityService" and
//it has a method postData
//which takes Entity object as parameter and pushes into database.
EntityService.postData(en);
System.out.println("added");
return "success";
}
}
Entity object on the Server side
#JsonAutoDetect
public class Entity {
private String mag;
private String paper;
public String getMag() {
return mag;
}
public void setMag(final String mag) {
this.mag = mag;
}
public String getPaper() {
return paper;
}
public void setPaper(final String paper)
this.paper = paper;
}
}
ajax
$(document).ready(function () {
var entity = {mag: "status_key", paper: "View10"};
$("#btn").click(function () {
$.ajax({
url: "/apipath/ajaxJsonPost",
type: 'post',
dataType: 'json',
data: JSON.stringify(entity),
contentType: 'application/json',
success : function(response) {
alert(response);
},
error : function() {
alert('error');
}
});
});
});
And as far as why and when to use #ResponseStatus and #ResponseEntity, there is already a short and simple answer here by #Sotirios Delimanolis. When use #ResponseEntity .
It says :
ResponseEntity is meant to represent the entire HTTP response. You can
control anything that goes into it: status code, headers, and body.
#ResponseBody is a marker for the HTTP response body and
#ResponseStatus declares the status code of the HTTP response.
#ResponseStatus isn't very flexible. It marks the entire method so you
have to be sure that your handler method will always behave the same
way. And you still can't set the headers. You'd need the
HttpServletResponse or a HttpHeaders parameter.
Basically, ResponseEntity lets you do more.

JQuery, AJAX, POST request, parameters lost

My web application is basen on Spring MVC (4.0.5).
I'm trying to send a POST request through AJAX, using jQuery (v. 2.1.1):
function deleteItem(id) {
alert("Deleting " + id);
$.ajax({
url: "ajax/delete_item",
type: 'POST',
dataType: 'html',
data: {"id": id},
contentType: 'application/json',
mimeType: 'application/json',
success: function(data) {
var txt = data;
$('#message').html(txt);
},
error: function(data, status, err) {
$('#message').html(err);
}
});
}
The Controller's method is called successfully but there are no parameters in the request:
#RequestMapping(value = "/ajax/delete_item", method = RequestMethod.POST)
public #ResponseBody String ajaxDelete(HttpServletRequest request) {
Enumeration<String> en = request.getParameterNames();
while (en.hasMoreElements()) {
String pname = en.nextElement();
System.out.println("//// " + pname); // just for test
}
String idStr = request.getParameter("id");
Integer id = Integer.parseInt(idStr);
//...
Why the request parameter is lost? Not just the value, the parameter itself is also lost.
What's wrong here?

If you are passing content type contentType: 'application/json' from ajax then add that settings in Spring method declaration as below: ( add produces = "application/json" in definition)
#RequestMapping(value = "/ajax/delete_item", method = RequestMethod.POST , produces = "application/json")
public #ResponseBody String ajaxDelete(HttpServletRequest request) {
also there's one more caveat that,
You are mentioning both datatype and mimeType but it is not uniform.
mimeType: 'application/json' should be written with dataType: 'json' and not html.

I am not 100% sure what is wrong with your solution but I can give you an example that works for me
The AJAX request using Jquery :
// Do AJAX
$(function () {
$.post(mobileUrl + "/leave/requestLeave",
{ startDate: startDate, endDate: endDate, leaveTypeId: leaveTypeId,
notes: notes, isStartDayHalfDay: isStartDayHalfDay, isHalfDayEndDay: isHalfDayEndDay },
function (response) {
$('#feedbackTextArea').show();
}
);
});
And the controller method
#RequestMapping(value = "/requestLeave", method = RequestMethod.POST)
#ResponseBody
public String createOrUpdateNewForm(String startDate, String endDate, String leaveTypeText, String leaveTypeId,
String notes, String isStartDayHalfDay, String isHalfDayEndDay) {
startDate = new DateTime(startDate).toDate() etc
}
}
One thing to remember is that the parameter names in the ajax request should match the names of the variables in the controller method implementation

$("#drpop").change(function () {
var code = $(this).val();
$.ajax({
url: '/Ordering/OrderingTable',
type: 'post',
datatype: 'json',
data: { OperCode: code },
success:function(msg){
alert(msg);
} }); });
[HttpPost]
public ActionResult OrderingTable(string OperCode)
{
Orderingbll order = new Orderingbll();
var result = order.ListCategory(OperCode);//here you write your code
return Json(result,JsonRequestBehavior.AllowGet);
}

response status from server to client

In my app I want to respond from server to client the status of the operation, for example, from client sends data in format json to server and I want that this responds whit status of the operation, if these data have inserted correctly in database to send status 200,...
I now have this.
Client:
function sendAjax() {
//I build the params necessary to send to server in format json
$.ajax({
url: "/url",
type: 'POST',
dataType: 'json',
data: param,
contentType: 'application/json',
mimeType: 'application/json',
success: function(data) {
alert(data.id );
},
error: function(data,status,er) {
alert("error: "+data+" status: "+status+" er:"+er);
}
});
alert();
}
Server:
Controller.java
#RequestMapping(value = "/", method = RequestMethod.POST)
public #ResponseBody
ResponseJson post (#RequestBody String string){
//I have the operations necessary to insert in database
ResponseJson pruebaJson = new ResponseJson ();
pruebaJson.setId (id);
return pruebaJson;
}
ResponseJson.java
public class ResponseJson implements Serializable
{
private String id;
public String getId ()
{
return id;
}
public void setId (String id)
{
this.id = id;
}
}
How will I process the status that server send to client? this is, if I get status 200 or other status.
My app is realized in spring-mvc and I use javascript with ajax to send data in format json from client to server.
Thanks

You can do it by :
$.ajax({
statusCode: {
404: function() {
alert( "page not found" );
},
200: function() {
alert("insert done..!!!");
},
}
});
This may help you.
See JQuery API for more option.
EDIT : on the basis of my understanding you want to check status code inside success or error function for that
success: function(data , textStatus, jqXHR) {
alert(data.id );
var statusCode = jqXHR.status
if(statusCode == 200 ){
//Your code execute if status is 200
}
}
like wise you can do it in error function also.

In your ajax call success function executes when server sends status 200 code. other than that your error function only executes.
If you want to handle error status separately you can handle in error function with return status.