Spring mvc custom validator annotation with constraintvalidator example interface using maven and eclipse



Spring mvc custom validator annotation

package com.candidjava.spring.bean;

import java.util.List;

import javax.validation.constraints.NotNull;
import javax.validation.constraints.Size;

import com.candidjava.spring.validator.Email;
import com.candidjava.spring.validator.Phone;

public class User
{
@NotNull
@Size(min=1)
private String name;

@NotNull
@Size(min=1)
private List<String> language;

@Size(min=1)
private String country;

@NotNull
private String gender;

@Size(min=8, max=20)
private String password;
@Phone
private String phone;
public String getPhone() {
return phone;
}

public void setPhone(String phone) {
this.phone = phone;
}

@Email
@Size(min=1)
private String email;

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

public List<String> getLanguage() {
return language;
}

public void setLanguage(List<String> language) {
this.language = language;
}

public String getCountry() {
return country;
}

public void setCountry(String country) {
this.country = country;
}

public String getGender() {
return gender;
}

public void setGender(String gender) {
this.gender = gender;
}

public String getPassword() {
return password;
}

public void setPassword(String password) {
this.password = password;
}

public String getEmail() {
return email;
}

public void setEmail(String email) {
this.email = email;
}
}


Spring constraintValidator

Phone.java

package com.candidjava.spring.validator;

import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

import javax.validation.Constraint;
import javax.validation.Payload;


@Documented
@Constraint(validatedBy = EmailConstraintValidator.class)
@Target({ElementType.METHOD,ElementType.FIELD})
@Retention(RetentionPolicy.RUNTIME)
public @interface Email
{

String message() default "{Email}";

Class<?>[] groups() default {};

Class<? extends Payload>[] payload() default {};

}


PhoneValidator.java

package com.candidjava.spring.validator;

import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;

public class PhoneValidator implements ConstraintValidator<Phone, String> {

@Override
public void initialize(Phone paramA) {
}

@Override
public boolean isValid(String phoneNo, ConstraintValidatorContext ctx) {
if(phoneNo == null){
return false;
}
//validate phone numbers of format "1234567890"
if (phoneNo.matches("\\d{10}")) return true;
//validating phone number with -, . or spaces
else if(phoneNo.matches("\\d{3}[-\\.\\s]\\d{3}[-\\.\\s]\\d{4}")) return true;
//validating phone number with extension length from 3 to 5
else if(phoneNo.matches("\\d{3}-\\d{3}-\\d{4}\\s(x|(ext))\\d{3,5}")) return true;
//validating phone number where area code is in braces ()
else if(phoneNo.matches("\\(\\d{3}\\)-\\d{3}-\\d{4}")) return true;
//return false if nothing matches the input
else return false;
}

}


Email.java

package com.candidjava.spring.validator;

import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

import javax.validation.Constraint;
import javax.validation.Payload;


@Documented
@Constraint(validatedBy = EmailConstraintValidator.class)
@Target({ElementType.METHOD,ElementType.FIELD})
@Retention(RetentionPolicy.RUNTIME)
public @interface Email
{

String message() default "{Email}";

Class<?>[] groups() default {};

Class<? extends Payload>[] payload() default {};

}


EmailConstraintValidator.java

package com.candidjava.spring.validator;

import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

import javax.validation.Constraint;
import javax.validation.Payload;


@Documented
@Constraint(validatedBy = EmailConstraintValidator.class)
@Target({ElementType.METHOD,ElementType.FIELD})
@Retention(RetentionPolicy.RUNTIME)
public @interface Email
{

String message() default "{Email}";

Class<?>[] groups() default {};

Class<? extends Payload>[] payload() default {};

}


Spring Controller

package com.candidjava.spring.controller;


import javax.validation.Valid;

import org.springframework.stereotype.Controller;
import org.springframework.validation.BindingResult;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.servlet.ModelAndView;

import com.candidjava.spring.bean.User;

@Controller
public class UserController {

User users = new User();
@GetMapping("index")
public ModelAndView register(User user) {
return new ModelAndView("register");
}

@PostMapping("/register")
public ModelAndView create(@Valid User user, BindingResult bindingResult) {
ModelAndView model = new ModelAndView("view");
// user bean will be automatically binded to view refer @ModelAttribute
if(bindingResult.hasErrors())
{
return new ModelAndView("register");
}
users.setName(user.getName());
users.setEmail(user.getEmail());
users.setGender(user.getGender());
users.setLanguage(user.getLanguage());
users.setCountry(user.getCountry());
users.setPassword(user.getPassword());
return model;
}

@GetMapping("/register")
public ModelAndView viewData(User user) {

ModelAndView model = new ModelAndView("register");
return model;
}

}

Spring Resource file

Size.user.name = please enter name
NotNull.user.gender = Please specify your gender
Size.user.country = Please select your country
Size.user.language= Please select at least one language
Size.user.password = password must be between 8 and 20
Size.user.email=Email field can't be blank
typeMismatch=Invalid format
Email=please enter valid email address
Phone=please enter Valid phone number

JSP view

<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<%@taglib prefix="form" uri="http://www.springframework.org/tags/form"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<style type="text/css">
.err
{
color:red;
}
</style>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>

<body>

<h2>Simple spring form handling</h2>
<form:form action="register" method="POST" modelAttribute="user">
Name:<form:input path="name"/><p><form:errors path="name" class="err"/></p><br>
Gender : Male<form:radiobutton name="gender" value="male" path="gender"/> Female<form:radiobutton name="gender" value="female" path="gender"/><p><form:errors path="gender" class="err"/></p><br>
Email : <form:input path="email"/><p><form:errors path="email" class="err"/></p><br>
Phone : <form:input path="phone"/><p><form:errors path="phone" class="err"/></p><br>
Languages : English<form:checkbox value="english" path="language" /> French<form:checkbox value="french" path="language"/> Tamil<form:checkbox value="tamil" path="language"/><p><form:errors path="language" class="err"/></p><br>
Country : <form:select path="country">
<form:option value="">select country</form:option>
<form:option value="india">INDIA</form:option>
<form:option value="usa">USA</form:option>
<form:option value="china">CHINA</form:option>
</form:select>
<p><form:errors path="country" class="err"/></p>

<br>
Password:<form:password path="password"/><p><form:errors path="password" class="err"/></p><br>
<input type="submit" value="submit" />
</form:form>
</body>
</html>



Refer

    Spring 4 maven dependency

    Spring 4 Java based configuration



Screenshot



Download

            Spring 4 form ConstraintValidator example war

            Spring 4 form ConstraintValidator example maven zip




Related Post

Comments


©candidjava.com