Spring MVC Number Range Validation

Example of Number Range Validation

Here, we are going to create an example of number range validation.

Following are the steps to create an example of number range validation.

  • Create a request page

In this step, we are going to create a request page named index.jsp for the web application.

index.jsp

 <html>
 <body>
 <h2> Spring MVC Web application </h2>
 <a href = "cust-regis-form"> Customer Registration Form </a>
 </body>
 </html> 
  • Create the Model class

In this step, we are going to create the Model class named Customer.java, which stores the data.

Customer.java

 import javax.validation.constraints.Max;
 import javax.validation.constraints.Min;
 import javax.validation.constraints.NotNull;
 import javax.validation.constraints.Size;
 public class Customer {
                 private String fname;
                 @NotNull 
                 @Size(min = 3, message = " This field is required ")
                 private String lname;
                 @Min(value = 1, message = "Tickets must be greater than or equal to 1 ")
                 @Max(value = 100, message = "Tickets must be smaller than or equal to 100")
                 private int movie_tick ;
                 public int getMovie_tick() {
                                 return movie_tick;
                 }
                 public void setMovie_tick(int movie_tick) {
                                 this.movie_tick = movie_tick;
                 }
                 public String getFname() {
                                 return fname;
                 }
                 public void setFname(String fname) {
                                 this.fname = fname;
                 }
                 public String getLname() {
                                 return lname;
                 }
                 public void setLname(String lname) {
                                 this.lname = lname;
                 }
  } 
  • Create the Controller

In this step, we are going to create the Controller named MainCotroller.java, which returns the JSP pages.

MainController.java

 import javax.validation.Valid;
 import org.springframework.beans.propertyeditors.StringTrimmerEditor;
 import org.springframework.stereotype.Controller;
 import org.springframework.ui.Model;
 import org.springframework.validation.BindingResult;
 import org.springframework.web.bind.WebDataBinder;
 import org.springframework.web.bind.annotation.InitBinder;
 import org.springframework.web.bind.annotation.ModelAttribute;
 import org.springframework.web.bind.annotation.RequestMapping;
 @Controller
 public class MainController {
                 @InitBinder
                 public void initBinder(WebDataBinder dataBinder) {
                                 StringTrimmerEditor stringEditor = new StringTrimmerEditor(true);
                                 dataBinder.registerCustomEditor(String.class,stringEditor );
                 }
                 @RequestMapping("/cust-regis-form")
                 public String showCustomerForm(Model m) {
                                 m.addAttribute("customer", new Customer()) ;
                                 return "customerform" ;
                 }
                 @RequestMapping("/processForm")
                 public String showCustomerData( @Valid @ModelAttribute("customer") Customer custom,
                                                 BindingResult thebindingresult) {
                                 System.out.println("Last Name: |" +  custom.getLname() + "|");
                                 if (thebindingresult.hasErrors()) {
                                                 return "customerform" ;
                                 }
                                 else {
                                                 return "customerformdata" ;
                                 }
              }
   } 
  • Add the entry of Controller in the web.xml

In this step, we are going to add the entry of the Controller in the web.xml file.

web.xml

 <?xml version = "1.0" encoding = "UTF-8"?>
 <web-app xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance"
                 xmlns = "http://xmlns.jcp.org/xml/ns/javaee"
                 xsi:schemaLocation = "http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
                 id = "WebApp_ID" version = "3.1">
                 <display-name>spring-mvc-demo</display-name>
                 <absolute-ordering />
                 <!-- Spring MVC Configs -->
                 <!-- Step 1: Configure Spring MVC Dispatcher Servlet -->
                 <servlet>
                                 <servlet-name>dispatcher</servlet-name>
                                 <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
                                 <init-param>
                                                 <param-name>contextConfigLocation</param-name>
                                                 <param-value>/WEB-INF/spring-servlet.xml</param-value>
                                 </init-param>
                                 <load-on-startup>1</load-on-startup>
                 </servlet>
                 <!-- Step 2: Set up URL mapping for Spring MVC Dispatcher Servlet -->
                 <servlet-mapping>
                                 <servlet-name>dispatcher</servlet-name>
                                 <url-pattern>/</url-pattern>
                 </servlet-mapping>
 </web-app> 
  • Define the Model in another XML file

In this step, we are going to define the Model/ Bean in another XML file (spring-servlet.xml).

spring-servlet.xml

 <?xml version = "1.0" encoding = "UTF-8"?>
 <beans xmlns = "http://www.springframework.org/schema/beans"
                 xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance" 
                 xmlns:context = "http://www.springframework.org/schema/context"
                 xmlns:mvc = "http://www.springframework.org/schema/mvc"
                 xsi:schemaLocation = "  http://www.springframework.org/schema/beans
 http://www.springframework.org/schema/beans/spring-beans.xsd
 http://www.springframework.org/schema/context
 http://www.springframework.org/schema/context/spring-context.xsd
 http://www.springframework.org/schema/mvc
 http://www.springframework.org/schema/mvc/spring-mvc.xsd">
                 <!-- Step 3: Add support for component scanning -->
                 <context:component-scan base-package = "com.app.SpringMVCValidation" />
                 <!-- Step 4: Add support for conversion, formatting and validation support -->
                 <mvc:annotation-driven/>
                 <!-- Step 5: Define Spring MVC view resolver -->
                 <bean
                                 class = "org.springframework.web.servlet.view.InternalResourceViewResolver">
                                 <property name = "prefix" value = "/WEB-INF/view/" />
                                 <property name = "suffix" value = ".jsp" />
                 </bean>
 </beans> 
  • Create all the view pages

In this step, we are going to create all the view pages (JSP pages) required in the application.

customerform.jsp

 <%@ taglib prefix = "form" uri = "http://www.springframework.org/tags/form" %>
 <!DOCTYPE html>
 <html>
 <head>
 <meta charset = "ISO-8859-1">
 <title> Customer Form </title>
 <style>
      .error {color:red}
 </style>
 </head>
 <body>
 <h3><i>The field with Asterisk(*) mark is required.</i></h3>
 <form:form action = "processForm" modelAttribute = "customer" >
 FIRST NAME: <form:input path = "fname" />
 <br></br>
 LAST NAME (*): <form:input path = "lname" />
   <form:errors path = "lname" cssClass = "error" >
   </form:errors>
 <br> </br>
 TICKETS: <form:input path = "movie_tick"/>
      <form:errors path = "movie_tick" cssClass = "error">
     </form:errors>
 <br></br>
 <input type = "submit" value = "Submit" />
  </form:form>
 </body>
 </html> 

customerformdata.jsp

 <%@ taglib prefix = "c" uri = "http://java.sun.com/jsp/jstl/core" %>
 <!DOCTYPE html>
 <html>
 <head>
 <title>Customer data</title>
 </head>
 <body>
 The customer is confirmed: ${customer.fname} ${customer.lname}
 <br> </br>
 Tickets : ${customer.movie_tick}
 </body>
 </html> 

Output

Spring MVC Number Range Validation
Spring MVC Number Range Validation 1
Spring MVC Number Range Validation 2
Spring MVC Number Range Validation 3
Spring MVC Number Range Validation 4
Spring MVC Number Range Validation 5



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