Tuesday, January 24, 2017

Spring MVC - TextArea Example

The following example show how to use TextArea in forms using Spring Web MVC framework. To start with it, let us have working Eclipse IDE in place and follow the following steps to develop a Dynamic Form based Web Application using Spring Web Framework:

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

public class User {
 
   private String username;
   private String password;
   private String address;

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

   public String getPassword() {
      return password;
   }
   public void setPassword(String password) {
      this.password = password;
   }
   public String getAddress() {
      return address;
   }
   public void setAddress(String address) {
      this.address = address;
   }
}
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
public class UserController {

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

   @RequestMapping(value = "/addUser", method = RequestMethod.POST)
   public String addUser(@ModelAttribute("SpringWeb")User user, 
      ModelMap model) {
      model.addAttribute("username", user.getUsername());
      model.addAttribute("password", user.getPassword());
      model.addAttribute("address", user.getAddress());
   
      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 user() method is called it returns user.jsp view.
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 a "users" view will be returned from the service method, which will result in rendering users.jsp
user.jsp
<%@taglib uri="http://www.springframework.org/tags/form" prefix="form"%>
<html>
<head>
   <title>Spring MVC Form Handling</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><form:label path="address">Address</form:label></td>
         <td><form:textarea path="address" rows="5" cols="30" /></td>
      </tr>  
      <tr>
         <td colspan="2">
            <input type="submit" value="Submit"/>
         </td>
      </tr>
   </table>  
</form:form>
</body>
</html>
Here We're using <form:textarea /> tag to render a HTML textarea box. For example
<form:textarea path="address" rows="5" cols="30" />
It will render following HTML content.
<textarea id="address" name="address" rows="5" cols="30"></textarea>
users.jsp
<%@taglib uri="http://www.springframework.org/tags/form" prefix="form"%>
<html>
<head>
    <title>Spring MVC Form Handling</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>    
      <tr>
         <td>Address</td>
         <td>${address}</td>
      </tr>   
   </table>  
</body>
</html>
Once you are done with creating source and configuration files, export your application. Right click on your application and 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 web pages from webapps folder using a standard browser. Now try a URL http://localhost:8080/HelloWeb/user and you should see the following result if everything is fine with your Spring Web Application:
Spring TextArea Form After submitting required information click on submit button to submit the form. You should see the following result if everything is fine with your Spring Web Application:
Spring TextArea Form Result
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