AJAX Form $.Post INSERT database Check Ajax Struts 2 JAVA

myAjax.js

Java 2017

$(document).ready(function() {
  $("#submit").on('click', function() {

  var formData = $("#addForm").serialize(); 
  
  $.ajax({
        type : "POST",
        url : "addDanhMucMatHang", //Path action struts.xml
        cache : false,
        data : formData,
        success : function(response) {
    
           $('#message').html(response);
           },
             error : function(e) {
             alert('Error: ' + e);
           }
     });

     return false;
   });
});

myAction.java

Java 2017

public class ItemAction {

    private Item item;

    public Item getItem() {
        return item;
    }

    public void setItem(Item item) {
        this.item = item;
    }

    // Insert Item
    public String insertItem() throws IOException {
        ItemDAO dao = new ItemDAO();
        //True & false > insert
        if (dao.insertItem(getItem())) {
            return "success";
        } else {
            return "error";
        }
    }
}

public class Item {

     private int itemID;
     private String itemName;
     private int itemAmt;
     private Float itemUnitPrice;
     private String itemUnitName;
     private Float itemDisc;
     private Float itemTotalAmt;

        //Getter + Serter + Constructor
}

//Cách 2 sử dụng AJAX $.POST method
$(document).ready(function () {
    // click on button submit
    $("#submit").on('click', function () {
         
        var maHang = $('#maHang').val();
        var tenHang = $('#tenHang').val();
        var soLuong = $('#soLuong').val();
        var donGia = $('#donGia').val();
        var donViTinh = $('#donViTinh').val();
        var chietKhau2 = $('#chietKhau2').val();
        var thanhTien2 = $('#thanhTien2').val();
        $.post('addDanhMucMatHang', {
            'item.itemID': maHang,
            'item.itemName': tenHang,
            'item.itemAmt': soLuong,
            'item.itemUnitPrice': donGia,
            'item.itemUnitName': donViTinh,
            'item.itemDisc': chietKhau2,
            'item.itemTotalAmt': thanhTien2
        }, function (result) {
            if (result.booleanCheck == "true") {
                $('#message').text(result.booleanCheck);
            } else {
                $('#message').text(result.booleanCheck);
            }
        });
    });
});

//Cách 2: $.POST 
public String insertItem() throws IOException {
        ItemDAO dao = new ItemDAO();

        HttpServletResponse response = ServletActionContext.getResponse();
        PrintWriter out = response.getWriter();
        response.setContentType("application/json");

        boolean result = dao.insertItem(getItem());
        String jsonCheck;

        if (result) {
                System.out.println(result);
                jsonCheck = "{\"booleanCheck\":\""+result+"\"}";
           
                out.write(jsonCheck);
                out.flush();
                return NONE;
        }
        jsonCheck = "{\"booleanCheck\":\""+result+"\"}";
        out.write(jsonCheck);
        out.flush();
        return NONE;

}