springMVC : Spring Form validation Using Validator(Annotation)

Spring Form validation Using Validator(Annotation)

index.jsp

======

New Users Registration : <a href="register.htm" >Here</a>

web.xml

======

<?xml version="1.0" encoding="UTF-8"?>

<web-app version="3.1" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd">

    <servlet>

        <servlet-name>dispatcher</servlet-name>

        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>

        <load-on-startup>2</load-on-startup>

    </servlet>

    <servlet-mapping>

        <servlet-name>dispatcher</servlet-name>

        <url-pattern>*.htm</url-pattern>

    </servlet-mapping>

    <session-config>

        <session-timeout>

            30

        </session-timeout>

    </session-config>

    <welcome-file-list>

        <welcome-file>index.jsp</welcome-file>

    </welcome-file-list>

</web-app>

dispatcher-servlet.xml

===============

<?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"

       xmlns:aop="http://www.springframework.org/schema/aop"

       xmlns:tx="http://www.springframework.org/schema/tx"

       xmlns:context="http://www.springframework.org/schema/context"

       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd

       http://www.springframework.org/schema/context  http://www.springframework.org/schema/context/spring-context-4.0.xsd

       http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd

       http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd">

   

    <context:component-scan base-package="myspring" />

    <bean id="validator" class="org.springframework.validation.beanvalidation.LocalValidatorFactoryBean" />

 

</beans>

MyController.java

===========

package myspring;

import javax.validation.Valid;

//import javax.validation.Validator;// don't use this import.

import org.springframework.validation.Validator;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.stereotype.Controller;

import org.springframework.ui.ModelMap;

import org.springframework.validation.BindingResult;

import org.springframework.web.bind.WebDataBinder;

import org.springframework.web.bind.annotation.InitBinder;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RequestMethod;

@Controller

@RequestMapping("/register.htm")

public class MyController {

    @Autowired

    private Validator validator;

    public Validator getValidator() {

        return validator;

    }

    public void setValidator(Validator validator) {

        System.out.println("===setValidator===");

        this.validator = validator;

    }

    @InitBinder

    public void initBinder(WebDataBinder binder){

        System.out.println("In initBinder.");

        binder.setValidator(validator);

        //Comment above line and execute, Validations will not work.

    }

   

   

    @RequestMapping(method = RequestMethod.GET)

    public String showForm(ModelMap map){

        User user = new User();

        map.addAttribute("user", user);

   

    return "/WEB-INF/jsp/register.jsp";

    }

   

    @RequestMapping(method = RequestMethod.POST)

    public String onSubmit(@Valid User user,BindingResult result){

        if(result.hasErrors()){

    return "/WEB-INF/jsp/register.jsp";

        }

    return "/WEB-INF/jsp/success.jsp";

    }

}

User.java

======

package myspring;

import javax.validation.constraints.Size;

import org.hibernate.validator.constraints.NotEmpty;

public class User {

    @NotEmpty(message = "User Must not be Blank.")

    private String name;

    @NotEmpty(message = "Pass Word Must not be Blank.")

    @Size(min = 8, max = 10, message = "Pass Word should be between 8 and 10")

    private String passWord;

    public String getName() {

        return name;

    }

    public void setName(String name) {

        this.name = name;

    }

   

    public String getPassWord() {

        return passWord;

    }

    public void setPassWord(String passWord) {

        this.passWord = passWord;

    }

  

}

register.jsp

=======

<%@taglib uri="http://www.springframework.org/tags/form" prefix="form" %>

<form:form method="POST" commandName="user" >

   Enter the user name : <form:input path="name" /><form:errors path="name" /> <br />

   Enter the pass word : <form:password path="passWord" /><form:errors path="passWord" /> <br />

   <input type="submit" value="Login" />

   

</form:form>

success.jsp

=======

Hi,

Login of ${user.name} is successful.