vy-nguyen/Validate submit form

## Validate submit form
package com.howtodoinjava.demo.model;

import java.io.Serializable;

public class EmployeeVO implements Serializable
{
    private static final long serialVersionUID = 1L;

    private Integer id;
    private String firstName;
    private String lastName;
    private String email;

    //Getters and Setters

    @Override
    public String toString() {
        return "EmployeeVO [id=" + id + ", firstName=" + firstName
                + ", lastName=" + lastName + ", email=" + email + "]";
    }
}

<%@ page contentType="text/html;charset=UTF-8"%>
<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form"%>
<%@ taglib prefix="spring" uri="http://www.springframework.org/tags" %>

<html>
<head>
    <title>Add Employee Form</title>
</head>

<body>
    <h2><spring:message code="lbl.page" text="Add New Employee" /></h2>
    <br/>
    <form:form method="post" modelAttribute="employee">
        <table>
            <tr>
                <td><spring:message code="lbl.firstName" text="First Name" /></td>
                <td><form:input path="firstName" /></td>
            </tr>
            <tr>
                <td><spring:message code="lbl.lastName" text="Last Name" /></td>
                <td><form:input path="lastName" /></td>
            </tr>
            <tr>
                <td><spring:message code="lbl.email" text="Email Id" /></td>
                <td><form:input path="email" /></td>
            </tr>
            <tr>
                <td colspan="2"><input type="submit" value="Add Employee"/></td>
            </tr>
        </table>
    </form:form>
</body>
</html>

@Controller
@RequestMapping("/employee-module/addNew")
@SessionAttributes("employee")
public class EmployeeController
{
    @Autowired
    EmployeeManager manager;

    @RequestMapping(method = RequestMethod.GET)
    public String setupForm(Model model)
    {
         EmployeeVO employeeVO = new EmployeeVO();
         model.addAttribute("employee", employeeVO);
         return "addEmployee";
    }

    @RequestMapping(method = RequestMethod.POST)
    public String submitForm(@ModelAttribute("employee") EmployeeVO employeeVO,
                            BindingResult result, SessionStatus status)
    {
        //Store the employee information in database
        //manager.createNewRecord(employeeVO);

        //Mark Session Complete
        status.setComplete();
        return "redirect:addNew/success";
    }

    @RequestMapping(value = "/success", method = RequestMethod.GET)
    public String success(Model model)
    {
         return "addSuccess";
    }
}
<%@ page contentType="text/html;charset=UTF-8"%>
<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form"%>
<%@ taglib prefix="spring" uri="http://www.springframework.org/tags" %>

<html>
<head>
    <title>Add Employee Form</title>
    <style>
    .error
    {
        color: #ff0000;
        font-weight: bold;
    }
    </style>
</head>

<body>
    <h2><spring:message code="lbl.page" text="Add New Employee" /></h2>
    <br/>
    <form:form method="post" modelAttribute="employee">
        <%-- <form:errors path="*" cssClass="error" /> --%>
        <table>
            <tr>
                <td><spring:message code="lbl.firstName" text="First Name" /></td>
                <td><form:input path="firstName" /></td>
                <td><form:errors path="firstName" cssClass="error" /></td>
            </tr>
            <tr>
                <td><spring:message code="lbl.lastName" text="Last Name" /></td>
                <td><form:input path="lastName" /></td>
                <td><form:errors path="lastName" cssClass="error" /></td>
            </tr>
            <tr>
                <td><spring:message code="lbl.email" text="Email Id" /></td>
                <td><form:input path="email" /></td>
                <td><form:errors path="email" cssClass="error" /></td>
            </tr>
            <tr>
                <td colspan="3"><input type="submit" value="Add Employee"/></td>
            </tr>
        </table>
    </form:form>
</body>
</html>
@RequestMapping(method = RequestMethod.POST)
public String submitForm(@ModelAttribute("employee") EmployeeVO employeeVO,
                        BindingResult result, SessionStatus status)
{
    //Validation code start
    boolean error = false;

    System.out.println(employeeVO); //Verifying if information is same as input by user

    if(employeeVO.getFirstName().isEmpty()){
        result.rejectValue("firstName", "error.firstName");
        error = true;
    }

    if(employeeVO.getLastName().isEmpty()){
        result.rejectValue("lastName", "error.lastName");
        error = true;
    }

    if(employeeVO.getEmail().isEmpty()){
        result.rejectValue("email", "error.email");
        error = true;
    }

    if(error) {
        return "addEmployee";
    }
    //validation code ends

    //Store the employee information in database
    //manager.createNewRecord(employeeVO);

    //Mark Session Complete
    status.setComplete();
    return "redirect:addNew/success";
}
	package com.howtodoinjava.demo.model;

	import java.io.Serializable;

	public class EmployeeVO implements Serializable
	{
	private static final long serialVersionUID = 1L;

	private Integer id;
	private String firstName;
	private String lastName;
	private String email;

	//Getters and Setters

	@Override
	public String toString() {
	return "EmployeeVO [id=" + id + ", firstName=" + firstName
	+ ", lastName=" + lastName + ", email=" + email + "]";
	}
	}

	<%@ page contentType="text/html;charset=UTF-8"%>
	<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form"%>
	<%@ taglib prefix="spring" uri="http://www.springframework.org/tags" %>

	<html>
	<head>
	<title>Add Employee Form</title>
	</head>

	<body>
	<h2><spring:message code="lbl.page" text="Add New Employee" /></h2>
	<br/>
	<form:form method="post" modelAttribute="employee">
	<table>
	<tr>
	<td><spring:message code="lbl.firstName" text="First Name" /></td>
	<td><form:input path="firstName" /></td>
	</tr>
	<tr>
	<td><spring:message code="lbl.lastName" text="Last Name" /></td>
	<td><form:input path="lastName" /></td>
	</tr>
	<tr>
	<td><spring:message code="lbl.email" text="Email Id" /></td>
	<td><form:input path="email" /></td>
	</tr>
	<tr>
	<td colspan="2"><input type="submit" value="Add Employee"/></td>
	</tr>
	</table>
	</form:form>
	</body>
	</html>

	@Controller
	@RequestMapping("/employee-module/addNew")
	@SessionAttributes("employee")
	public class EmployeeController
	{
	@Autowired
	EmployeeManager manager;

	@RequestMapping(method = RequestMethod.GET)
	public String setupForm(Model model)
	{
	EmployeeVO employeeVO = new EmployeeVO();
	model.addAttribute("employee", employeeVO);
	return "addEmployee";
	}

	@RequestMapping(method = RequestMethod.POST)
	public String submitForm(@ModelAttribute("employee") EmployeeVO employeeVO,
	BindingResult result, SessionStatus status)
	{
	//Store the employee information in database
	//manager.createNewRecord(employeeVO);

	//Mark Session Complete
	status.setComplete();
	return "redirect:addNew/success";
	}

	@RequestMapping(value = "/success", method = RequestMethod.GET)
	public String success(Model model)
	{
	return "addSuccess";
	}
	}
	<%@ page contentType="text/html;charset=UTF-8"%>
	<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form"%>
	<%@ taglib prefix="spring" uri="http://www.springframework.org/tags" %>

	<html>
	<head>
	<title>Add Employee Form</title>
	<style>
	.error
	{
	color: #ff0000;
	font-weight: bold;
	}
	</style>
	</head>

	<body>
	<h2><spring:message code="lbl.page" text="Add New Employee" /></h2>
	<br/>
	<form:form method="post" modelAttribute="employee">
	<%-- <form:errors path="*" cssClass="error" /> --%>
	<table>
	<tr>
	<td><spring:message code="lbl.firstName" text="First Name" /></td>
	<td><form:input path="firstName" /></td>
	<td><form:errors path="firstName" cssClass="error" /></td>
	</tr>
	<tr>
	<td><spring:message code="lbl.lastName" text="Last Name" /></td>
	<td><form:input path="lastName" /></td>
	<td><form:errors path="lastName" cssClass="error" /></td>
	</tr>
	<tr>
	<td><spring:message code="lbl.email" text="Email Id" /></td>
	<td><form:input path="email" /></td>
	<td><form:errors path="email" cssClass="error" /></td>
	</tr>
	<tr>
	<td colspan="3"><input type="submit" value="Add Employee"/></td>
	</tr>
	</table>
	</form:form>
	</body>
	</html>
	@RequestMapping(method = RequestMethod.POST)
	public String submitForm(@ModelAttribute("employee") EmployeeVO employeeVO,
	BindingResult result, SessionStatus status)
	{
	//Validation code start
	boolean error = false;

	System.out.println(employeeVO); //Verifying if information is same as input by user

	if(employeeVO.getFirstName().isEmpty()){
	result.rejectValue("firstName", "error.firstName");
	error = true;
	}

	if(employeeVO.getLastName().isEmpty()){
	result.rejectValue("lastName", "error.lastName");
	error = true;
	}

	if(employeeVO.getEmail().isEmpty()){
	result.rejectValue("email", "error.email");
	error = true;
	}

	if(error) {
	return "addEmployee";
	}
	//validation code ends

	//Store the employee information in database
	//manager.createNewRecord(employeeVO);

	//Mark Session Complete
	status.setComplete();
	return "redirect:addNew/success";
	}