![](https://www.javatpoint.com/images/spimages/spring1.png)

Source[Here](https://www.javatpoint.com/images/spimages/spring1.png)
#### What Will I Learn?
In this tutorial, we will learn about how we can develop Rest web API or Services using @RestController annotation in Spring framework and how  you can call the web services using ARC Client

- Rest Web services
- Get JSON data from Rest web Services using ARC or Web Browser

#### Requirements

- Eclipse IDE (Juno or above)
- JDK 1.7 or above
- Tomcat Server 7 or above
- Spring and jackson jar files
- Web Browser Chrome or Firefox

#### Difficulty

- Basic

#### Tutorial Contents
- Application Configuration wit Spring Framework

Now we configure the web application with sping framework to creating @restController

1. configuring web.xml file
First of all paste all jar files into lib folder
Here we configure web.xml file to run application application
```
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" 
	xmlns="http://java.sun.com/xml/ns/javaee" 
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
	http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
  <servlet>
		<servlet-name>spring</servlet-name>
		<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
		<init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>/WEB-INF/config/spring-servlet.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
  </servlet>  
  <servlet-mapping>
		<servlet-name>spring</servlet-name>
		<url-pattern>/</url-pattern>
  </servlet-mapping>
  <welcome-file-list>
		<welcome-file></welcome-file>
  </welcome-file-list>  
</web-app>
```
![Screenshot (103).png](https://res.cloudinary.com/hpiynhbhq/image/upload/v1516012856/sl4tmx5pf01oo2jkqofb.png)

1. configuring spring-servlet.xml
Basic configuration of databse, view resolver and sessionfactory
```
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:mvc="http://www.springframework.org/schema/mvc" 
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
	xmlns:p="http://www.springframework.org/schema/p" 
	xmlns:context="http://www.springframework.org/schema/context"
	xmlns:tx="http://www.springframework.org/schema/tx"
	xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-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/tx
http://www.springframework.org/schema/tx/spring-tx-3.0.xsd">
```
```	
<context:property-placeholder location="classpath:resources/database.properties" />
	<context:component-scan base-package="com.blog" />
```
```
	<bean id="jspViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
		<property name="viewClass" value="org.springframework.web.servlet.view.JstlView" />
		<property name="prefix" value="/" />
		<property name="suffix" value=".jsp" />
	</bean>
	```
```
	<bean id="sessionFactory" class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
		<property name="dataSource" ref="dataSource" />
		<property name="annotatedClasses">
			<list>
				<value>com.blog.model.Users</value>
			</list>
		</property>
		<property name="hibernateProperties">
			<props>
				<prop key="hibernate.dialect">${hibernate.dialect}</prop>
				<prop key="hibernate.show_sql">${hibernate.show_sql}</prop>
				<prop key="hibernate.hbm2ddl.auto">${hibernate.hbm2ddl.auto}</prop>				
			</props>
		</property>
	</bean>
```

</beans>
```
![Screenshot (104).png](https://res.cloudinary.com/hpiynhbhq/image/upload/v1516012832/wq4boushyywgq6yoplrb.png)



- Creating RestController
Here we create RestControler java file and write code for populating list and converlist from ArrayList to json and this controler return json object string

```
package com.blog.restwebservice;
import java.io.IOException;
import java.text.ParseException;
import java.util.ArrayList;
import java.util.List;
import org.codehaus.jackson.JsonGenerationException;
import org.codehaus.jackson.map.JsonMappingException;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;
import com.blog.bean.QuestionsBean;
import beans.ConvertDateFormat;
import beans.ListToJsonObject;
import beans.Sudent;
import com.blog.model.Questions;
import com.blog.service.QuestionsService;

@RestController
@RequestMapping("/yayayaa")
public class RestWebServiceController {
	@Autowired(required=false)
	private QuestionsService questionsService;	
	ListToJsonObject listtojson = new ListToJsonObject();
	ConvertDateFormat fmt = new ConvertDateFormat();	
	@RequestMapping(method = RequestMethod.GET)
	public @ResponseBody String listQuestionsss() throws JsonGenerationException, JsonMappingException, IOException, ParseException {						
		List<Sudent> list = listofStudents();	
		String json = new ObjectMapper().writeValueAsString(list);
		return json;
	}		
	List<Sudent> list = new ArrayList<Sudent>();
	public List<Sudent> listofStudents()
	{
		list.add(new Sudent(1,20,"Rahul","Whatever","rahul@gmail.com"));
		list.add(new Sudent(2,21,"Ramesh","Whatever","ramesh@gmail.com"));
		list.add(new Sudent(3,22,"Shyam","Whatever","shyam@gmail.com"));
		list.add(new Sudent(4,23,"Ram","Whatever","ram@gmail.com"));
		list.add(new Sudent(5,24,"Krishna","Whatever","krishna@gmail.com"));
		list.add(new Sudent(6,25,"Jacop","Whatever","jacop@gmail.com"));		
		return list;
	}
}
```
![Screenshot (106).png](https://res.cloudinary.com/hpiynhbhq/image/upload/v1516012892/bhzpvotg0rsp48hef9sv.png)


### Result
- Lets  run the project using tomcat server call the controller using ARC Client
![Screenshot (108).png](https://res.cloudinary.com/hpiynhbhq/image/upload/v1516012493/gazows1dozstbkjuewtv.png)

- run on web browser
![Screenshot (107).png](https://res.cloudinary.com/hpiynhbhq/image/upload/v1516012563/lfotzpxpatt59jyv3xqf.png)

- parse retuned JSON data with json parser
![Screenshot (109).png](https://res.cloudinary.com/hpiynhbhq/image/upload/v1516012668/temdozmcxfwl8xaud9xv.png)


 It's Done !
Congratulations ! we successfully developed Rest Web Service.
#### Thank You !
Share from the core of my heart

    

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