This
in continuation to my previous post. In my previous post, I explained how to
place the validation error messages in a property file use them in spring
application.
Suppose
if you did any changes in the properties file, to reflect these new validation
error messages, you should restart the application server.
In
this post, I am going to explain how to reload the properties file dynamically.
How to reload the
properties file dynamically?
Just
add below statement in the dispatcher servlet file.
<bean id="messageSource"
class="org.springframework.context.support.ReloadableResourceBundleMessageSource">
<property
name="basename" value="WEB-INF/studentMessages" />
<property name="cacheSeconds" value="1" />
</bean>
As
you see, I set value 1 to the property cacheSeconds. It reloads the properties
file every one second. Make sure that, you are not using this property in
production (Since it leads to performance problems).
Find
the below working application.
package com.sample.myApp.controllers; import javax.validation.Valid; import org.springframework.stereotype.Controller; import org.springframework.validation.BindingResult; import org.springframework.web.bind.annotation.ModelAttribute; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.servlet.ModelAndView; import com.sample.myApp.model.Student; @Controller public class HelloWorldController { @RequestMapping("/registration") public String getRegistrationpage() { return "registration"; } @RequestMapping("/registerMe") public ModelAndView getHelloMessage(@Valid @ModelAttribute("studentInfo") Student student, BindingResult bindingResult) { if (bindingResult.hasErrors()) { ModelAndView modelAndView = new ModelAndView("registration"); return modelAndView; } ModelAndView modelAndView = new ModelAndView("welcome"); modelAndView.addObject("message", "Dear User, your details are registered"); return modelAndView; } }
Student.java
package com.sample.myApp.model; import java.util.Date; import java.util.List; import javax.validation.constraints.DecimalMax; import javax.validation.constraints.Size; public class Student { @Size(min = 3, max = 30) private String userName; @DecimalMax(value = "40") private int age; private List<String> hobbies; private Date dateOfBirth; public Date getDateOfBirth() { return dateOfBirth; } public void setDateOfBirth(Date dateOfBirth) { this.dateOfBirth = dateOfBirth; } public String getUserName() { return userName; } public void setUserName(String userName) { this.userName = userName; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } public List<String> getHobbies() { return hobbies; } public void setHobbies(List<String> hobbies) { this.hobbies = hobbies; } }
Create
registration.jsp, welcome.jsp files under WEB-INF/jsp folder.
registration.jsp
<%@taglib prefix="form" uri="http://www.springframework.org/tags/form"%> <html> <head> <title>User Information Page</title> </head> <body> <h2 style="color:red;"><form:errors path="studentInfo.*" /></h2> <form method="post" action="/springdemo/registerMe" id="f1"> <table> <tr> <td>User Name :</td> <td><input type="text" name="userName" value="" /></td> </tr> <tr> <td>Age :</td> <td><input type="text" name="age" value="" /></td> </tr> <tr> <td>Hobbies :</td> <td><select multiple name="hobbies"> <option value="cricket">Cricket</option> <option value="chess">Chess</option> <option value="football">Football</option> <option value="tennis">Tennis</option> </select></td> </tr> <tr> <td>Date Of Birth</td> <td><input type="text" name="dateOfBirth" value="" /></td> </tr> <tr> <td><input type="submit" name="submit" value="submit" style="font-size: 18px;" /></td> </tr> </table> </form> </body> </html>
welcome.jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> <title>Hello World Spring Web MVC</title> </head> <body> <h1>${message}</h1> <h3> User Name : ${studentInfo.userName} <br /> Age : ${studentInfo.age} <br /> Hobbies: ${studentInfo.hobbies} <br /> Date Of Birth: ${studentInfo.dateOfBirth} </h3> </body> </html>
Create
web.xml, HelloWorld-servlet.xml, studentMessages.properties under WEB-INF
folder.
web.xml
<web-app id="WebApp_ID" version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"> <display-name>Spring MVC Hello WorldApplication</display-name> <servlet> <servlet-name>HelloWorld</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>HelloWorld</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> </web-app>
HelloWorld-servlet.xml
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context" xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd"> <mvc:annotation-driven /> <context:component-scan base-package="com.sample.myApp" /> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix" value="/WEB-INF/jsp/" /> <property name="suffix" value=".jsp" /> </bean> <bean id="messageSource" class="org.springframework.context.support.ReloadableResourceBundleMessageSource"> <property name="basename" value="WEB-INF/studentMessages" /> <property name="cacheSeconds" value="1" /> </bean> </beans>
studentMessages.properties
Size.studentInfo.userName=User name must be between 3 and 30 DecimalMax.studentInfo.age=Age must be less than or equal to 40
Create
index.jsp file under webapp folder.
index.jsp
<%@taglib prefix="form" uri="http://www.springframework.org/tags/form"%> <html> <head> <title>Welcome Page</title> </head> <body> <h3>Dear Student, click on below button to register yourself</h3> <form method="post" action="/springdemo/registration" id="f1"> <input type="submit" name="submit" value="submit" style="font-size: 18px;" /> </form> </body> </html>
Click
on submit button.
Enter
some wrong inputs and click on submit button, you can able to see validation
error messages.
Update
‘studentMessages.properties’ file
like below and resubmit the form.
studentMessages.properties
Size.studentInfo.userName=userName
must be between 3 and 30
DecimalMax.studentInfo.age=age
must be less than or equal to 40
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