In this post , we will see how to use ModelMap in Spring MVC.
Spring MVC tutorial:
- Spring MVC hello world example
- Spring MVC Hibernate MySQL example
- Spring MVC interceptor example
- Spring MVC angularjs example
- Spring MVC @RequestMapping example
- Spring Component,Service, Repository and Controller example
- Spring MVC @ModelAttribute annotation example
- Spring MVC @RestController annotation example
- Spring MultiActionController Example
- Spring MVC ModelMap
- Spring MVC file upload example
- Spring restful web service example
- Spring restful web service json example
- Spring Restful web services CRUD example
- Spring security hello world example
- Spring security cus
ModelMap object is used to pass multiple values from Spring MVC controller to JSP .
Some basics about Spring MVC ModelMap class:
- ModelMap class subclasses LinkedHashMap. It add some methods for convenience.
- It provides addAttribute method to put key value pair. This method return ModelMap objects that can be used for chaining.
- ModelMap uses
- ModelMap checks for null values.
Example:
Prerequisite:
You need to create spring mvc hello world example first.
Once you are done with spring mvc sample project. We need to add or modify following files.
- Make changes to HelloWorldController.java
- Modify index.jsp
- Modify hello.jsp
Thats all we need to do to demonstrate Spring MultiActionController example.
1) change HelloWorldController.java as below
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package org.arpit.java2blog.springmvc.controller; import org.springframework.stereotype.Controller; import org.springframework.ui.ModelMap; import org.springframework.web.bind.annotation.RequestMapping; @Controller public class HelloWorldController { @RequestMapping("/helloworld") public String hello(ModelMap map) { String helloWorldMessage = "Hello world from java2blog!"; String welcomeMessage = "Welcome to java2blog!"; map.addAttribute("helloMessage", helloWorldMessage); map.addAttribute("welcomeMessage", welcomeMessage); return "hello"; } } |
We have added two attributes to ModelMap and they will be used in jsp with helloMessage and welcomeMessage
2) Modify index.jsp
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<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!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=UTF-8"> <title>HelloWorld</title> </head> <body> Click here to read hello and welcome message </body> </html> |
3)Modify hello.jsp in /WEB_INF folder.
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<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!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=UTF-8"> <title>Hello</title> </head> <body> ${helloMessage} <br/> ${welcomeMessage} </body> </html> |
4) It ‘s time to do maven build.
Right click on project -> Run as -> Maven build
5) Provide goals as clean install (given below) and click on run
Run the application
6) Right click on project -> run as -> run on server
Select apache tomcat and click on finish
7) You will see below screen:
When you click on link, you will get below screen
We are done with Spring MVC ModelMap example. If you are still facing any issue, please comment.
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