CODEWITHSUNDEEP
javaspringhibernatejsp
bkuriach
bkuriach

Reputation: 350

How to display data of objects in JSP

I have stored some user details through a register form into db (hibernate and spring). I want to display the user details of all users in a separate JSP page.Could anyone please tell me how to do that?

Below is my code of controller

@Controller
public class RegisterController {

    @Autowired
    private UserDao userDao;

    @RequestMapping(value = "/registerForm.htm", method = RequestMethod.GET)
    public ModelAndView registerPage(ModelMap map) {
        User user = new User();
        map.addAttribute(user);
        return new ModelAndView("registerForm", "command", user);

    }

    @RequestMapping(value = "/registerProcess.htm", method = RequestMethod.POST)
    public ModelAndView registerUser(@ModelAttribute("user") User user, Model model) {

        model.addAttribute("userName", user.getUserName());
        model.addAttribute("password", user.getPassword());
        model.addAttribute("emailId", user.getEmailId());
        System.out.println("user is " + user);
        System.out.println("userdao is" + userDao);
        userDao.saveUser(user);
        return new ModelAndView("registerProcess", "user", user);

    }

}

code inside userdao

public void saveUser(User user) {

    Session session=getSessionFactory().openSession();
    Transaction tx;
    tx=session.beginTransaction();

    session.persist(user);
    tx.commit();

}

Upvotes: 0

Views: 25036

Answers (2)

Luiggi Mendoza
Luiggi Mendoza

Reputation: 85779

You should obtain the elements you want to show to user in a GET request. This involves the following steps:

  • Have a proper URL mapping and view to process the GET.
  • Obtain the data in the method that will pre process your URL.
  • Store the data to display to users as request attribute.
  • Forward to the view (JSP).
  • In view, display the data from request attributes.

A very simple example based on your current code and assuming the existence of some methods:

@Controller
public class RegisterController {

    @Autowired
    private UserDao userDao;

    @RequestMapping(value="/registerForm.htm",method=RequestMethod.GET)
    public ModelAndView registerPage(ModelMap map){
        User user=new User();
         map.addAttribute(user);
        return new ModelAndView("registerForm","command",user); 
    }

    @RequestMapping(value="/registerProcess.htm",method=RequestMethod.POST)
    public ModelAndView registerUser(@ModelAttribute("user") User user,Model model){
        model.addAttribute("userName", user.getUserName());
        model.addAttribute("password", user.getPassword());
        model.addAttribute("emailId",user.getEmailId());
        System.out.println("user is "+user);
        System.out.println("userdao is"+userDao);
        userDao.saveUser(user);
        return new ModelAndView("registerProcess","user",user);
    }

    //this is the new method with proper mapping
    @RequestMapping(value="/userList.htm", method=RequestMethod.GET)
    public ModelAndView registerPage(ModelMap map) {
        //this method should retrieve the data for all users
        List<User> userList = userDao.getAllUsers();
        map.addAttribute("userList", userList);
        return new ModelAndView("userList", map);
    }
}

Then, in userList.jsp:

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE html>
<html lang="en">
<head>
    <title>User List</title>
</head>
<body>
    List of users:
    <br />
    <table>
        <c:forEach items="${userList}" var="user">
            <tr>
                <td>${user.userName}</user>
            </tr>
        </c:forEach>
    </table>
</body>
</html>

Note that this is a very basic example about how to do this. The code can be heavily improved.

More info:

Upvotes: 3

Learner
Learner

Reputation: 21393

Write another method to get all the users and then store the list of retrieved users in your model object then use the JSTL forEach tag in your JSP to display the users, you can use this link to see how the data can be displayed on JSP using JSTL forEach loop: JSP Errors in ForEach Loop

Upvotes: 0

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