We have already learnt about Form handling in Spring using @Controller annotation. In this article we will learn how to use SimpleFormController(Deprecated in Spring 3) instead of @Controller to handle a Spring MVC Form.
When we take a look into the configuration file, the mapping for the controller will be made like below
<bean name="/ShowRegistrationForm.htm" class="com.javainterviewpoint.SimpleFormControllerExample" p:formView="StudentRegistrationForm"/>
Here we can see we have mentioned the Spring container to use SimpleFormControllerExample as the controller for request “ShowRegistrationForm.htm”
Folder Structure:
- Create a Dynamic Web Project “SpringMVCFormHandling” and create a package for our src files “com.javainterviewpoint“
- Place the Spring 3 jar files under WEB-INF/Lib
commons-logging-1.1.1.jar
log4j-1.2.16.jar
slf4j-api-1.7.5.jar
slf4j-log4j12-1.7.5.jar
spring-aspects-3.2.4.RELEASE.jar
spring-beans-3.2.4.RELEASE.jar
spring-context-3.2.4.RELEASE.jar
spring-core-3.2.4.RELEASE.jar
spring-expression-3.2.4.RELEASE.jar
spring-web-3.2.4.RELEASE.jar
spring-webmvc-3.2.4.RELEASE.jar - Create the Java classes SimpleFormControllerExample.java and Student.java under com.javainterviewpoint folder.
- Place the SpringConfig-servlet.xml and web.xml under the WEB-INF directory
- View files StudentRegistrationForm.jsp and studentSuccess.jsp are put under the sub directory under WEB-INF/Jsp
- Place the redirector.jsp under the WebContent folder which will act as our index page.
SimpleFormControllerExample.java
- Our SimpleFormControllerExample class extends SimpleFormController class and overrides “onSubmit()” method.
- In the constructor of our class(SimpleFormControllerExample) we will be setting CommandClass and CommandName as our Student Class.
- Inside the onSubmit() method, We will get the command object and will type cast to Student Type and will create a ModelAndView object which has the redirecting page(studentSuccess) and Command “st” along with it.
package com.javainterviewpoint;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.SimpleFormController;
@SuppressWarnings("deprecation")
public class SimpleFormControllerExample extends SimpleFormController
{
public SimpleFormControllerExample()
{
setCommandClass(Student.class);
setCommandName("st");
}
@Override
protected ModelAndView onSubmit(Object command) throws Exception {
Student st = (Student)command;
return new ModelAndView("studentSuccess","st",st);
}
}
Student.java
Student class act as our Model class here. It has two properties studentId & studentName and their corresponding getters and setters.
package com.javainterviewpoint;
public class Student
{
private int studentId;
private String studentName;
public int getStudentId() {
return studentId;
}
public void setStudentId(int studentId) {
this.studentId = studentId;
}
public String getStudentName() {
return studentName;
}
public void setStudentName(String studentName) {
this.studentName = studentName;
}
}
redirector.jsp
redirector.jsp will be our index page, which redirects to “ShowRegistrationForm.htm” whose mapping will be made in SpringConfig-servlet.xml
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<%
response.sendRedirect("ShowRegistrationForm.htm");
%>
</body>
</html>
StudentRegistrationForm.jsp
StudentRegistrationForm will have the form where user enters the student details
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%@ taglib uri="http://www.springframework.org/tags/form" prefix="form" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<form:form method = "POST" commandName="st">
Student Id : <form:input path="studentId"/><br>
Student Name: <form:input path="studentName"/><br>
<input type="submit">
</form:form>
</body>
</html>
studentSuccess.jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<h2> Welcome to ${msg}</h2>
</body>
</html>
web.xml
The web.xml has everything about the application that a server needs to know, which is placed under the WEB-INF directory. <servlet-name> contains the name of the SpringConfiguration , when the DispatcherServlet is initialized the framework will try to load a configuration file “[servlet-name]-servlet.xml” under the WEB-INF directory.
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5"> <display-name>SpringMVCFormHandling</display-name> <welcome-file-list> <welcome-file>index.html</welcome-file> <welcome-file>index.htm</welcome-file> <welcome-file>index.jsp</welcome-file> <welcome-file>default.html</welcome-file> <welcome-file>default.htm</welcome-file> <welcome-file>default.jsp</welcome-file> </welcome-file-list> <servlet> <servlet-name>SpringConfig</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>SpringConfig</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> </web-app>
SpringConfig-servlet.xml
- The SpringConfig-servlet.xml is also placed under the WEB-INF directory.
- Here we have configured SimpleFormContollerExample as the controller for the request “/ShowRegistrationForm.htm”
- We have also mapped the view page which the request has to be redirected to “StudentRegistrationForm” using “p:formView” attribute.
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd"> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix" value="/WEB-INF/Jsp/" /> <property name="suffix" value=".jsp" /> </bean> <bean name="/ShowRegistrationForm.htm" class="com.javainterviewpoint.SimpleFormControllerExample" p:formView="StudentRegistrationForm" /> </beans>
Output
StudentRegistrationForm
Success Page
Leave a Reply