Spring Custom Validator Example With Validator Interface

Spring Controller with @Validated Annotation:

package com.candidjava.spring.controller;

import javax.validation.Validation;
import javax.validation.ValidatorFactory;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Controller;
import org.springframework.validation.BindingResult;
import org.springframework.validation.Validator;
import org.springframework.validation.annotation.Validated;
import org.springframework.web.bind.WebDataBinder;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.InitBinder;
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();
  
  @Autowired
  @Qualifier("userValidator")
  private Validator validator;
  
  @InitBinder
  private void initBinder(WebDataBinder binder) {
    binder.setValidator(validator);
  }
  
  @GetMapping("index")
  public ModelAndView register(User user) {
    return new ModelAndView("register");
  }

  @PostMapping("/register")
  public ModelAndView create(@Validated User user, BindingResult bindingResult) throws NoSuchMethodException, SecurityException {
    
    ModelAndView model = new ModelAndView("view");
    // user bean will be automatically binded to view refer @ModelAttribute
    ValidatorFactory vf= Validation.buildDefaultValidatorFactory();
    javax.validation.Validator validator = vf.getValidator();
     validator.validate(user);
      
    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());
      users.setPhone(user.getPhone());
    return model;
  }

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

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

Implementing spring Validator Interface

package com.candidjava.spring.validator;

import org.springframework.validation.Errors;
import org.springframework.validation.ValidationUtils;
import org.springframework.validation.Validator;

import com.candidjava.spring.bean.User;

public class UserCustomValidation implements Validator{
  @Override
  public boolean supports(Class<?> userClass) {
    return User.class.equals(userClass);
  }

  @Override
  public void validate(Object target, Errors errors) {
    
    User user = (User) target;
    if(!(user.getName().matches("[a-zA-Z ]*$")))
    {
      errors.rejectValue("name", "symbolsPresent",new Object[]{"'name'"},"name can't be symbols");
    }
    ValidationUtils.rejectIfEmptyOrWhitespace(errors, "name", "name.required");
    ValidationUtils.rejectIfEmptyOrWhitespace(errors, "password", "password.required");
    ValidationUtils.rejectIfEmpty(errors, "gender","gender.required");
    ValidationUtils.rejectIfEmpty(errors, "country","country.required");
    ValidationUtils.rejectIfEmpty(errors, "language","language.required");
    ValidationUtils.rejectIfEmpty(errors, "phone","phone.required");
    ValidationUtils.rejectIfEmpty(errors, "email","email.required");
    
  }

}

Spring ReloadableResourceBundleMessageSource and Validator Bean configuration

package com.candidjava.spring.configuration;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.support.ReloadableResourceBundleMessageSource;
import org.springframework.validation.Validator;
import org.springframework.web.servlet.ViewResolver;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.view.InternalResourceViewResolver;
import org.springframework.web.servlet.view.JstlView;

import com.candidjava.spring.validator.UserCustomValidation;
@Configuration
@EnableWebMvc
@ComponentScan(basePackages="com.candidjava.spring.controller")
public class SpringConfiguration {
  
  @Bean(name="jspViewResolver")
  public ViewResolver viewResolver()
  {
    InternalResourceViewResolver viewResolver=new InternalResourceViewResolver();
  
    viewResolver.setPrefix("WEB-INF/views/");
    viewResolver.setSuffix(".jsp");
    viewResolver.setViewClass(JstlView.class);
    return viewResolver;
  }
  
  @Bean
  public ReloadableResourceBundleMessageSource messageSource()
  {
    ReloadableResourceBundleMessageSource messageSource = new ReloadableResourceBundleMessageSource();
    messageSource.setBasename("classpath:message");
    messageSource.setDefaultEncoding("UTF-8");
    return messageSource;
    
  }
  
  @Bean
  public Validator userValidator()
  {
    Validator bean = new UserCustomValidation();
    return bean;
  }
}

Spring resource file

name.required=Name field can't be blank
gender.required=Please specify your gender
language.required=Please select at least one language
country.required=Please select your country
password.required=Password field can't be blank
email.required=Email field can't be blank
phone.required=Phone field can't be blank

Screenshot

Download

Spring 4 form validator example war

Spring 4 form validator example maven zip