Hey guys in this post, you will learn about reading checkbox values from Java model class with easy to understand example.
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Table of Contents
Overview
- In Spring MVC is represented by the tag
<form:checkbox /> - If you want to read radio button values from java model then we can use
<form:checkboxes />
<form:checkboxes path="departments" items="${employee.departmentOptions}" />
Complete Example
Lets create a step by step maven project to understand the Spring MVC
Create a maven project
First you need to create a maven webapp project. You can check the below post to create new maven webapp project –
- Create a maven webapp project
Add Maven Dependencies
Open pom.xml and add the following maven dependencies
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>in.bushansirgur</groupId>
<artifactId>springmvc</artifactId>
<packaging>war</packaging>
<version>1.0.0</version>
<name>springmvc Maven Webapp</name>
<url>http://maven.apache.org</url>
<properties>
<maven.compiler.source>1.11</maven.compiler.source>
<maven.compiler.target>1.11</maven.compiler.target>
<spring.version>4.3.6.RELEASE</spring.version>
<failOnMissingWebXml>false</failOnMissingWebXml>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jsp-api</artifactId>
<version>2.0</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>jstl</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
</dependencies>
<build>
<finalName>springmvc</finalName>
</build>
</project>
Configure Spring MVC App
Create AppConfig.java class inside in.bushansirgur.springmvc.config package and add the following content
package in.bushansirgur.springmvc.config;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.ViewResolver;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.view.InternalResourceViewResolver;
@Configuration
@EnableWebMvc
@ComponentScan(basePackages = "in.bushansirgur.springmvc")
public class AppConfig {
//define the bean for view resolver
@Bean
public ViewResolver viewResolver() {
InternalResourceViewResolver viewResolver = new InternalResourceViewResolver();
viewResolver.setPrefix("/WEB-INF/view/");
viewResolver.setSuffix(".jsp");
return viewResolver;
}
}
Configure Dispatcher Servlet
Create MySpringMvcDispatcherServletInitializer.java inside in.bushansirgur.springmvc.config package and add the following content
package in.bushansirgur.springmvc.config;
import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;
public class MySpringMvcDispatcherServletInitializer extends AbstractAnnotationConfigDispatcherServletInitializer {
@Override
protected Class<?>[] getRootConfigClasses() {
return null;
}
@Override
protected Class<?>[] getServletConfigClasses() {
return new Class[] {AppConfig.class};
}
@Override
protected String[] getServletMappings() {
return new String[] {"/"};
}
}
Create a Java model
Inside src/main/java create a package in.bushansirgur.springmvc.model, under this create Employee.java and add the following content
package in.bushansirgur.springmvc.model;
import java.util.LinkedHashMap;
public class Employee {
private String firstName;
private String lastName;
private String country;
private LinkedHashMap<String, String> countryOptions;
private LinkedHashMap<String, String> genderOptions;
private LinkedHashMap<String, String> departmentOptions;
private String gender;
private String[] departments;
public Employee() {
//populate country options
countryOptions = new LinkedHashMap<String, String>();
countryOptions.put("IND", "India");
countryOptions.put("AUS", "Australia");
countryOptions.put("GER", "Germany");
countryOptions.put("CAN", "Canada");
countryOptions.put("SAF", "South Africa");
//populate gender options
genderOptions = new LinkedHashMap<String, String>();
genderOptions.put("Male", "Male");
genderOptions.put("Female", "Female");
//populate department options
departmentOptions = new LinkedHashMap<String, String>();
departmentOptions.put("Sales", "Sales");
departmentOptions.put("Marketing", "Marketing");
departmentOptions.put("HR", "HR");
departmentOptions.put("Admin", "Admin");
departmentOptions.put("IT", "IT");
}
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
public String getCountry() {
return country;
}
public void setCountry(String country) {
this.country = country;
}
public LinkedHashMap<String, String> getCountryOptions() {
return countryOptions;
}
public void setCountryOptions(LinkedHashMap<String, String> countryOptions) {
this.countryOptions = countryOptions;
}
public String getGender() {
return gender;
}
public void setGender(String gender) {
this.gender = gender;
}
public LinkedHashMap<String, String> getGenderOptions() {
return genderOptions;
}
public void setGenderOptions(LinkedHashMap<String, String> genderOptions) {
this.genderOptions = genderOptions;
}
public String[] getDepartments() {
return departments;
}
public void setDepartments(String[] departments) {
this.departments = departments;
}
public LinkedHashMap<String, String> getDepartmentOptions() {
return departmentOptions;
}
public void setDepartmentOptions(LinkedHashMap<String, String> departmentOptions) {
this.departmentOptions = departmentOptions;
}
}
Create a Controller
Inside src/main/java create a package in.bushansirgur.springmvc.controller, under this create HomeController.java and add the following content
package in.bushansirgur.springmvc.controller;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import in.bushansirgur.springmvc.model.Employee;
@Controller
public class HomeController {
@RequestMapping(value = "/")
public String showHomePage(Model theModel) {
theModel.addAttribute("employee", new Employee());
return "home-page";
}
@RequestMapping(value = "/processForm")
public String showDashboardPage(@ModelAttribute("employee") Employee theEmployee, Model theModel) {
theModel.addAttribute("employee", theEmployee);
return "dashboard";
}
}
@ModelAttribute annotation will bind the form values to the Java object.
Create a view template
Create home-page.jsp inside webapp/WEB-INF/view folder and add the following content
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%@taglib prefix="form" uri="http://www.springframework.org/tags/form"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<h1>Read the textbox value</h1>
<hr/>
<form:form action="processForm" modelAttribute="employee">
First Name:<form:input path="firstName" /><br/><br/>
Last Name: <form:input path="lastName" /><br/><br/>
Country: <form:select path="country">
<form:options items="${employee.countryOptions}" />
</form:select>
<br/><br/>
Gender:
<form:radiobuttons path="gender" items="${employee.genderOptions}" />
<br/><br/>
Departments:
<form:checkboxes items="${employee.departmentOptions}" path="departments"/>
<br/><br/>
<button type="submit">Submit</button>
</form:form>
</body>
</html>
model attribute in the <form:form> tag takes the name of the model which we added to the Model object in handler method.
Create dashboard.jsp inside webapp/WEB-INF/view folder and add the following content
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<h1>Read the textbox value</h1>
<hr/>
<p>Employee First name: ${employee.firstName}</p>
<p>Employee Last name: ${employee.lastName}</p>
<p>Employee country: ${employee.country}</p>
<p>Employee Gender: ${employee.gender}</p>
<p>Employee Department: </p>
<ul>
<c:forEach var="department" items="${employee.departments}">
<li>${department}</li>
</c:forEach>
</ul>
</body>
</html>
Run the App
Start the tomcat server, navigate to the URL localhost:8080/springmvc/
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