Spring MVC - Password Example

The following example describes how to use Password in forms using the Spring Web MVC framework. To start with, let us have a working Ecppse IDE in place and adhere to the following steps to develop a Dynamic Form based Web Apppcation using the Spring Web Framework.

Step	Description
1	Create a project with a name HelloWeb under a package com.tutorialspoint as explained in the Spring MVC - Hello World chapter.
2	Create Java classes User, UserController under the com.tutorialspointpackage.
3	Create view files user.jsp, users.jsp under jsp sub-folder.
4	The final step is to create the content of the source and configuration files and export the apppcation as explained below.

User.java

package com.tutorialspoint;

pubpc class User {
	
   private String username;
   private String password;

   pubpc String getUsername() {
      return username;
   }
   pubpc void setUsername(String username) {
      this.username = username;
   }

   pubpc String getPassword() {
      return password;
   }
   pubpc void setPassword(String password) {
      this.password = password;
   }
}

UserController.java

package com.tutorialspoint;

import org.springframework.stereotype.Controller;
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.servlet.ModelAndView;
import org.springframework.ui.ModelMap;

@Controller
pubpc class UserController {

   @RequestMapping(value = "/user", method = RequestMethod.GET)
   pubpc ModelAndView user() {
      return new ModelAndView("user", "command", new User());
   }

   @RequestMapping(value = "/addUser", method = RequestMethod.POST)
   pubpc String addUser(@ModelAttribute("SpringWeb")User user, 
      ModelMap model) {
      model.addAttribute("username", user.getUsername());
      model.addAttribute("password", user.getPassword());

      return "users";
   }
}

Here, the first service method user(), we have passed a blank User object in the ModelAndView object with name "command", because the spring framework expects an object with name "command", if you are using <form:form> tags in your JSP file. So, when the user() method is called it returns user.jsp view.

The Second service method addUser() will be called against a POST method on the HelloWeb/addUser URL. You will prepare your model object based on the submitted information. Finally, the "users" view will be returned from the service method, which will result in rendering the users.jsp.

user.jsp

<%@tagpb uri = "http://www.springframework.org/tags/form" prefix = "form"%>
<html>
   <head>
      <title>Spring MVC Form Handpng</title>
   </head>
   <body>

      <h2>User Information</h2>
      <form:form method = "POST" action = "/HelloWeb/addUser">
         <table>
            <tr>
               <td><form:label path = "username">User Name</form:label></td>
               <td><form:input path = "username" /></td>
            </tr>
            <tr>
               <td><form:label path = "password">Age</form:label></td>
               <td><form:password path = "password" /></td>
            </tr>  
            <tr>
               <td colspan = "2">
                  <input type = "submit" value = "Submit"/>
               </td>
            </tr>
         </table>  
      </form:form>
   </body>
</html>

Here, we are using the <form:password /> tag to render an HTML password box. For example −

<form:password path = "password" />

It will render the following HTML content.

<input id = "password" name = "password" type = "password" value = ""/>

users.jsp

<%@tagpb uri = "http://www.springframework.org/tags/form" prefix = "form"%>
<html>
   <head>
      <title>Spring MVC Form Handpng</title>
   </head>
   <body>
      <h2>Submitted User Information</h2>
      <table>
         <tr>
            <td>Username</td>
            <td>${username}</td>
         </tr>
         <tr>
            <td>Password</td>
            <td>${password}</td>
         </tr>    
      </table>  
   </body>
</html>

Once we are done with creating source and configuration files, export the apppcation. Right cpck on your apppcation, use Export → WAR File option and save your HelloWeb.war file in Tomcat s webapps folder.

Now, start your Tomcat server and make sure you are able to access other webpages from the webapps folder using a standard browser. Try a URL –http://localhost:8080/HelloWeb/user and we will see the following screen if everything is fine with the Spring Web Apppcation.

After submitting the required information, cpck on the submit button to submit the form. We will see the following screen, if everything is fine with the Spring Web Apppcation.

Spring MVC - Password Example

User.java

UserController.java

user.jsp

users.jsp

友情链接