如何在JSP中显示对象的数据
我已经通过注册表将一些用户详细信息存储到db(hibernate和弹簧)中。我想在单独的JSP页面中显示所有用户的用户详细信息。有人可以告诉我该怎么做吗?
下面是我的控制器代码
@Controllerpublic 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);
}
}
用户内的代码
public void saveUser(User user) { Session session=getSessionFactory().openSession();
Transaction tx;
tx=session.beginTransaction();
session.persist(user);
tx.commit();
}
回答:
您应该获取要在GET请求中显示给用户的元素。这涉及以下步骤:
- 具有正确的URL映射和视图以处理GET。
- 在将预处理您的URL的方法中获取数据。
- 存储数据以作为请求属性显示给用户。
- 转到视图(JSP)。
- 在视图中,显示请求属性中的数据。
一个非常简单的示例,它基于您当前的代码并假设存在一些方法:
@Controllerpublic 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);
}
}
然后,在userList.jsp中:
<%@ 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>
请注意,这是有关如何执行此操作的非常基本的示例。该代码可以大大改进。
以上是 如何在JSP中显示对象的数据 的全部内容, 来源链接: utcz.com/qa/426199.html