Spring MVC Number Validation

In Spring MVC Validation, we can validate the user’s input within a number range. The following annotations are used to achieve number validation:

@Min annotation – It is required to pass an integer value with @Min annotation. The user input must be equal to or greater than this value.
@Max annotation – It is required to pass an integer value with @Max annotation. The user input must be equal to or smaller than this value.

Spring MVC Number Validation Example

1. Add dependencies to pom.xml file.

pom.xml

  <!– https://mvnrepository.com/artifact/org.springframework/spring-webmvc –>  <dependency>      <groupId>org.springframework</groupId>      <artifactId>spring-webmvc</artifactId>      <version>5.1.1.RELEASE</version>  </dependency>  <!– https://mvnrepository.com/artifact/org.apache.tomcat/tomcat-jasper –>  <dependency>      <groupId>org.apache.tomcat</groupId>      <artifactId>tomcat-jasper</artifactId>      <version>9.0.12</version>  </dependency>      <!– https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api –>  <dependency>        <groupId>javax.servlet</groupId>        <artifactId>servlet-api</artifactId>        <version>3.0-alpha-1</version>    </dependency>  <!– https://mvnrepository.com/artifact/javax.servlet/jstl –>  <dependency>      <groupId>javax.servlet</groupId>      <artifactId>jstl</artifactId>      <version>1.2</version>  </dependency>   <!– https://mvnrepository.com/artifact/org.hibernate.validator/hibernate-validator –>  <dependency>      <groupId>org.hibernate.validator</groupId>      <artifactId>hibernate-validator</artifactId>      <version>6.0.13.Final</version>  </dependency>  

2. Create the bean class

Employee.java

  package com.tutoraspire;    import javax.validation.constraints.Max;  import javax.validation.constraints.Min;  import javax.validation.constraints.Size;    public class Employee {    private String name;  @Size(min=1,message=”required”)  private String pass;    @Min(value=18, message=”must be equal or greater than 18″)  @Max(value=45, message=”must be equal or less than 45″)  private int age;    public String getName() {  return name;  }  public void setName(String name) {  this.name = name;  }  public String getPass() {  return pass;  }  public void setPass(String pass) {  this.pass = pass;  }  public int getAge() {  return age;  }  public void setAge(int age) {  this.age = age;  }    }  

3. Create the controller class

EmployeeController.java

   package com.tutoraspire;    import javax.validation.Valid;  import org.springframework.stereotype.Controller;  import org.springframework.ui.Model;  import org.springframework.validation.BindingResult;  import org.springframework.web.bind.annotation.ModelAttribute;  import org.springframework.web.bind.annotation.RequestMapping;    @Controller  public class EmployeeController {    @RequestMapping(“/hello”)  public String display(Model m)  {  m.addAttribute(“emp”, new Employee());  return “viewpage”;  }  @RequestMapping(“/helloagain”)  public String submitForm( @Valid @ModelAttribute(“emp”) Employee e, BindingResult br)  {  if(br.hasErrors())  {  return “viewpage”;  }  else  {  return “final”;  }  }  }  

4. Provide the entry of 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://java.sun.com/xml/ns/javaee” xsi:schemaLocation=”http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd” id=”WebApp_ID” version=”3.0″>    <display-name>SpringMVC</display-name>     <servlet>        <servlet-name>spring</servlet-name>        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>        <load-on-startup>1</load-on-startup>      </servlet>    <servlet-mapping>        <servlet-name>spring</servlet-name>        <url-pattern>/</url-pattern>    </servlet-mapping>    </web-app>  

5. Define the bean in the xml file

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”>  <!– Provide support for component scanning –>  <context:component-scan base-package=”com.tutoraspire” />  <!–Provide support for conversion, formatting and validation –>  <mvc:annotation-driven/>  <!– Define Spring MVC view resolver –>       <bean id=”viewResolver” class=”org.springframework.web.servlet.view.InternalResourceViewResolver”>          <property name=”prefix” value=”/WEB-INF/jsp/”></property>          <property name=”suffix” value=”.jsp”></property>            </bean>  </beans>  

6. Create the requested page

index.jsp

  <%@ taglib prefix=”form” uri=”http://www.springframework.org/tags/form” %>  <html>  <body>  <a href=”../hello”>Click here…</a>  </body>  </html>  

7. Create the other view components

viewpage.jsp

  <%@ taglib prefix=”form” uri=”http://www.springframework.org/tags/form” %>  <html>  <head>  <style>  .error{color:red}  </style>  </head>  <body>  <form:form action=”helloagain” modelAttribute=”emp”>  Username: <form:input path=”name”/> <br><br>  Password: <form:password path=”pass”/>    <form:errors path=”pass” cssClass=”error”/><br><br>  Age: <form:input path=”age”/>   <form:errors path=”age” cssClass=”error”/><br><br>  <input type=”submit” value=”submit”>  </form:form>  </body>  </html>  

final.jsp

  <html>  <body>  Username: ${param.name} <br>  Password: ${param.pass} <br>  Age: ${param.age } <br>  </body>  </html>  

Output:

Spring MVC Number Validation

Download this example (developed using Eclipse)

Next TopicCustom Validation

Spring MVC Number Validation

Spring MVC Number Validation

Spring MVC Number Validation Example

1. Add dependencies to pom.xml file.

2. Create the bean class

3. Create the controller class

4. Provide the entry of controller in the web.xml file

5. Define the bean in the xml file

6. Create the requested page

7. Create the other view components

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