Spring MVC @valid annotation:
This tutorial shows you how to validate a bean with jsr 303 standard and uses the properties file to load the error message (resource bundle).
JSR 303 bean validation using javax standards
package com.candidjava.spring.bean; import java.util.List; import javax.validation.constraints.NotNull; import javax.validation.constraints.Size; 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; @Size(min=1, message="Email feild can't blank") 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; } }
@valid in 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; } }
Resource file for spring validation message
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 typeMismatch=Invalid format
Jsp view
<%@page import="org.springframework.validation.ObjectError"%> <%@ page import="com.candidjava.spring.bean.User" %> <%@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> 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>
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