Spring MVC ModelMap

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Spring MVC tutorial:

In this post , we will see how to use ModelMap in Spring MVC.

Spring MVC tutorial:

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 as generics.
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

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";
 }
}

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

<%@ 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>

<%@ 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>

<title>HelloWorld</title>

</head>

<body>

Click here to read hello and welcome message

</body>

</html>

3)Modify hello.jsp in /WEB_INF folder.

<%@ 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>

<%@ 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>

<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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Spring MVC ModelMap

Spring MVC tutorial:

Some basics about Spring MVC ModelMap class:

Example:

Prerequisite:

Run the application

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Spring MVC tutorial:

Some basics about Spring MVC ModelMap class:

Example:

Prerequisite:

Run the application

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