Spring
binds the collection data automatically.
Let
us try to implement a student registration form
public
class Student {
private String userName;
private int age;
private List<String> hobbies;
.....
.....
.....
}
By
using @ModelAttribute annotation, we can map the request parameters to the
complex object student. You no need to do extra logic to bind the hobbies,
spring automatically bind for you.
@RequestMapping("/registerMe")
public
ModelAndView getHelloMessage(@ModelAttribute("studentInfo") Student
student) {
ModelAndView modelAndView = new
ModelAndView("welcome");
modelAndView.addObject("message",
"Dear User, your details are registered");
return modelAndView;
}
Find
the below working application.
package com.sample.myApp.controllers; import org.springframework.stereotype.Controller; 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("/registerMe") public ModelAndView getHelloMessage(@ModelAttribute("studentInfo") Student student) { 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.List; public class Student { private String userName; private int age; private List<String> hobbies; 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
welcome.jsp file under WEB-INF/jsp folder.
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} </h3> </body> </html>
Create
web.xml, HelloWorld-servlet.xml files 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: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"> <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> </beans>
Create
index.jsp file under webapp folder.
index.jsp
<html> <head> <title>User Information Page</title> </head> <body> <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><input type="submit" name="submit" value="submit" style="font-size: 18px;" /></td> </tr> </table> </form> </body> </html>
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