Spring MVC form handling tutorial

Spring mvc framework provides the facility to build flexible and loosely coupled web applications. MVC stands for Model-View-Controller design pattern which separates the business logic, presentation logic and navigation logic. Let us discuss spring mvc form handling example in eclipse.

Example Explanation:

Use http://localhost:8080/SpringMVCExample5/student url to start the application. A request for respective resource will generate. Request will be handled by DispatcherServlet. It delegates the request to the FormHandlingController controller. The LoginController controller resolve the request with help of RequestMapping annotation, executes the specific functionality and returns the ModelAndView object to the DispatcherServlet. The DispatcherServlet then take the help of InternalResourceViewResolver to get the actual view name. In our example it will return the “/WEB-INF/jsp/student.jsp. The DispatcherServlet then insert the model data into view and render response. Same request response cycle will execute when we click on submit button after entering the student details.

Example:

student.jsp

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<%@taglib uri="http://www.springframework.org/tags/form" prefix="form"%>
<html>
  <head>
    <title>Spring MVC form handling example.</title>
  </head>
 
  <body>
<form:form method="POST" action="/SpringMVCExample5/addStudent">
   <table>
    <tr>
        <td><form:label path="name">Name</form:label></td>
        <td><form:input path="name" /></td>
    </tr>
    <tr>
        <td><form:label path="className">Class</form:label></td>
        <td><form:input path="className" /></td>
    </tr>
    <tr>
        <td><form:label path="rollNo">RollNo</form:label></td>
        <td><form:input path="rollNo" /></td>
    </tr>
    <tr>
        <td colspan="2">
            <input type="submit" value="Submit"/>
        </td>
    </tr>
</table>  
</form:form>
</body>
</html>

web.xml

<?xml version="1.0" encoding="UTF-8"?>  
<web-app version="2.4"
   xmlns="http://java.sun.com/xml/ns/j2ee" 
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee 
   http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
 
   <servlet>
      <servlet-name>FormHandling</servlet-name>
      <servlet-class>
         org.springframework.web.servlet.DispatcherServlet
      </servlet-class>
      <load-on-startup>1</load-on-startup>
   </servlet>
 
   <servlet-mapping>
      <servlet-name>FormHandling</servlet-name>
      <url-pattern>/</url-pattern>
   </servlet-mapping>
 
</web-app>

FormHandling-servlet.xml

<?xml version="1.0" encoding="UTF-8"?>  
<beans xmlns="http://www.springframework.org/schema/beans"
   xmlns:context="http://www.springframework.org/schema/context"
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xsi:schemaLocation="
   http://www.springframework.org/schema/beans     
   http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
   http://www.springframework.org/schema/context 
   http://www.springframework.org/schema/context/spring-context-3.0.xsd">
 
   <context:component-scan base-package="com.javawithease.business" />
 
   <bean class=
     "org.springframework.web.servlet.view.InternalResourceViewResolver">
      <property name="prefix" value="/WEB-INF/jsp/" />
      <property name="suffix" value=".jsp" />
   </bean>
 
</beans>

Student.java

public class Student {
	private String name;
	private String className;
	private String rollNo;
 
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getClassName() {
		return className;
	}
	public void setClassName(String className) {
		this.className = className;
	}
	public String getRollNo() {
		return rollNo;
	}
	public void setRollNo(String rollNo) {
		this.rollNo = rollNo;
	}
 
}

FormHandlingController.java

import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
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;
 
@Controller
public class FormHandlingController {
   @RequestMapping(value = "/student", method = RequestMethod.GET)
   public ModelAndView student() {
      return new ModelAndView("student", "command", new Student());
   }
 
   @RequestMapping(value = "/addStudent", method = RequestMethod.POST)
   public String addStudent(@ModelAttribute("SpringWeb")Student student, 
   ModelMap model) {
      model.addAttribute("name", student.getName());
      model.addAttribute("className", student.getClassName());
      model.addAttribute("rollNo", student.getRollNo());
 
      return "welcome";
   }
}

welcome.jsp

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <title>Spring MVC form handling example.</title>
  </head>
  <body>
    <h2>Student Details</h2>
    <table>
    <tr>
        <td>Name</td>
        <td>${name}</td>
    </tr>
    <tr>
        <td>Class</td>
        <td>${className}</td>
    </tr>
    <tr>
        <td>RollNo</td>
        <td>${rollNo}</td>
    </tr>
   </table>  
  </body>
</html>

Output:

Spring example5-1
Enter student detail.
Spring example5-2
Click on Submit button.
Spring example5-3
 
Download this example.