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i need explanation for spring tiles program

By: rajupa*** On: Thu Sep 28 09:57:43 IST 2017     Question Reputation0 Answer Reputation0 Quiz Belt Series Points0  0Blank User
package com.javatpoint.controller;
import org.springframework.stereotype.Controller;
import org.springframework.validation.BindingResult;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.SessionAttributes;
import org.springframework.web.servlet.ModelAndView;
import com.javatpoint.form.Contact;
@Controller
@SessionAttributes
public class ContactController {
@RequestMapping(value = "/addContact", method = RequestMethod.POST)
public String addContact(@ModelAttribute("contact") Contact contact, BindingResult result) {
//write the code here to add contact
return "redirect:contact.html";
}

@RequestMapping("/contact")
public ModelAndView showContacts() {
return new ModelAndView("contact", "command", new Contact());
}
}
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