In this tutorial we will create a simple Spring MVC Form to accept password from the user with Springs <form:password> tag library. Here we will create a simple Spring mvc form with two password fields and we will add validation support to check if it is not empty and size is between 1 and 5. We will also look into the showPassword attribute of the <form:password> tag.
In Spring MVC we will use <form:password/> tag to render a password field
<form:password path="password"/>
Which produces the below HTML code.
<input id="password" name="password" type="password" value=""/>
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
hibernate-validator-4.2.0.Final.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
validation-api-1.1.0.Final.jar
jstl-1.1.2.jar - Create the Java classes MVC_Controller.java and RegistrationBean.java under com.javainterviewpoint folder.
- Place the SpringConfig-servlet.xml and web.xml under the WEB-INF directory
- View files SpringMVC_TextBoxExample.jsp and Success.jsp are put under the sub directory under WEB-INF/Jsp
MVC_Controller.java
- The DispatcherServlet mapping which we make in the web.xml will delegate the all the request to our MVC_Controller as we have annotated it with @Controller annotation.
- We use the @RequestMapping annotation to map each of the request which we get to individual methods. Our controller has two methods initializeForm() and processForm().
- The firstMethod (initializeForm) will take the user to the “SpringMVC_PasswordExample” which is our view component with form backing object RegistrationBean.
- The Second method (processForm) will get called when the user submits the form. There the RegistrationBean object “rb” will be validated as we have annotated with @Valid annotation and the validation results will be added to the BindingResult. Based on the result we will re-direct the user back to the “SpringMVC_PasswordExample” or “Success” page.
package com.javainterviewpoint;
import javax.validation.Valid;
import org.springframework.stereotype.Controller;
import org.springframework.validation.BindingResult;
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 MVC_Controller
{
@RequestMapping("/PasswordExample")
public ModelAndView initializeForm()
{
return new ModelAndView("SpringMVC_PasswordExample","rb",new RegistrationBean());
}
@RequestMapping(value="/check",method=RequestMethod.POST)
public String processForm(@Valid @ModelAttribute("rb")RegistrationBean rb,BindingResult result)
{
if(result.hasErrors())
{
return "SpringMVC_PasswordExample";
}
else
{
return "Success";
}
}
}Model
RegistrationBean.java
Our RegistrationBean act as a Model here, which has two String properties password and confirmPassword, which has it own getters and setters so that it can be accessed from the view.
We have added the annotation @NotEmpty and @Size to check if the fields are not empty and size is between 1 and 5. We have added the respective custom error messages in the props.property file.
package com.javainterviewpoint;
import javax.validation.constraints.Size;
import org.hibernate.validator.constraints.NotEmpty;
public class RegistrationBean
{
@NotEmpty
@Size(min=1,max=5)
String password;
@NotEmpty
@Size(min=1,max=5)
String confirmPassword;
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getConfirmPassword() {
return confirmPassword;
}
public void setConfirmPassword(String confirmPassword) {
this.confirmPassword = confirmPassword;
}
}View
Our view component has two text fields Password and Confirm Password generated by using the Spring form tag library. The <form:form> has a noticeable property called as the “commandName” which has the name of the backing bean that is binded in the model(RegistrtationBean rb) .
<form:errors> tag displays the error message which occurs during the validation. <form:password> has a property showPassword which will render the password displayed even when the validation error has occured. So that we can correct our password from there itself.
SpringMVC_PasswordExample.jsp
<%@ 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>
<style>
.error {
color: #ff0000;
}
.commonerrorblock {
color: #000;
background-color: #ffEEEE;
border: 3px solid #ff0000;
}
</style>
</head>
<body>
<form:form action="check" method="post" commandName="rb">
<form:errors path="*" element="div" cssClass="commonerrorblock"/>
<table>
<tr>
<td>Password</td>
<td><form:password path="password" /></td>
<td><form:errors path="password" cssClass="error"/></td>
</tr>
<tr>
<td>ConfirmPassword</td>
<td><form:password path="confirmPassword" showPassword="true"/></td>
<td><form:errors path="confirmPassword" cssClass="error"/></td>
</tr>
<tr>
<td></td><td><input type="submit"></td><td></td>
</tr>
</table>
</form:form>
</body>
</html>props.properties
NotEmpty.rb.password=Please enter a valid Password Size.rb.password = Password size should be between 1 and 5 NotEmpty.rb.confirmPassword=Please confirm your Password Size.rb.confirmPassword = Password size should be between 1 and 5
Success.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>Password validated successfully!!!</h2><br></br>
<h2>Entered password : ${rb.password}</h2>
</body>
</html>Configurations
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%20http://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.
- <context:component-scan> will let the Spring Container to search for all the annotation under the package “com.javainteriviewpoint”.
- <mvc:annotation-driven/> annotation will activate the @Controller, @RequestMapping, @Valid etc annotations.
- The view is resolved through “org.springframework.web.servlet.view.InternalResourceViewResolver” which searches for the jsp files under the /WEB-INF/Jsp/ directory.
- Resource Bundle is accessed through the “org.springframework.context.support.ResourceBundleMessageSource” through its property “basename” which has the value “props”, and hence our property file should “props.properties”
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context" xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation=" http://www.springframework.org/schema/beans%20 http://www.springframework.org/schema/beans/spring-beans-3.0.xsd%20 http://www.springframework.org/schema/context%20 http://www.springframework.org/schema/context/spring-context-3.0.xsd%20 http://www.springframework.org/schema/mvc%20 http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd"> <context:component-scan base-package="com.javainterviewpoint"/> <mvc:annotation-driven/> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix" value="/WEB-INF/Jsp/"/> <property name="suffix" value=".jsp"/> </bean> <bean id="messageSource" class="org.springframework.context.support.ResourceBundleMessageSource"> <property name="basename" value="props"></property> </bean> </beans>
Lets run our application
Now lets run our application, do a clean build and deploy the application in the Server
Hit on the url “http://localhost:8080/SpringMVCFormHandling/PasswordExample”
Submit the form without entering any values (or) password length greater than 5
Upon successful validation, success page will be returned
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