Triggering @Controller Input Validation:- In Spring we can enable the JSR 303 Bean Validation to put the validation on bean and validate the form value in spring MVC .
StudentController.java
package com.manish.controller;
import javax.validation.Valid;
import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.validation.BindingResult;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import com.manish.model.Student;
@Controller
@RequestMapping("/student")
public class StudentController {
@RequestMapping(value = "/register", method = RequestMethod.POST)
public String addStudent(
@Valid Student student,
BindingResult result) {
if (result.hasErrors()) {
return "Registration";
} else {
return "Success";
}
}
@RequestMapping(method = RequestMethod.GET)
public String displayStudentForm(ModelMap model) {
model.addAttribute("student", new Student());
return "Registration";
}
}
Student.java
package com.manish.model;
import org.hibernate.validator.constraints.NotEmpty;
import org.hibernate.validator.constraints.Range;
public class Student {
@NotEmpty
String name;
@Range(min = 18, max = 21)
int age;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public Student() {
}
@Override
public String toString() {
return "Student [name=" + name + ", age=" + age + "]";
}
}
app-context.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">
<context:component-scan base-package="com.manish.controller" />
<mvc:annotation-driven />
<bean id="viewResolver"
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix">
<value>/WEB-INF/pages/</value>
</property>
<property name="suffix">
<value>.jsp</value>
</property>
</bean>
<bean class="org.springframework.context.support.ResourceBundleMessageSource"
id="messageSource">
<property name="basename" value="messages" />
</bean>
</beans>
Registration.jsp
<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form"%>
<html>
<head>
<style>
.error {
color: #ff0000;
}
.errorblock {
color: #000;
background-color: #ffEEEE;
border: 3px solid #ff0000;
padding: 8px;
margin: 16px;
}
</style>
</head>
<body>
<h2>Student Registration</h2>
<form:form method="POST" commandName="student" action="student/register">
<form:errors path="*" cssClass="errorblock" element="div" />
<table>
<tr>
<td>Name :</td>
<td><form:input path="name" /></td>
<td><form:errors path="name" cssClass="error" /></td>
</tr>
<tr>
<td>Age :</td>
<td><form:input path="age" /></td>
<td><form:errors path="age" cssClass="error" /></td>
</tr>
<tr>
<td colspan="3"><input type="submit" /></td>
</tr>
</table>
</form:form>
</body>
</html>
Success.jsp
<html>
<body>
<h2>Successfullly Registered</h2>
</body>
</html>
message.properties
NotEmpty.student.name = Name is required!
Range.student.age = Age between 18 and 21 only
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