[IMAGE: https://www.javatpoint.com/images/spimages/spring1.png]

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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

        spring
        org.springframework.web.servlet.DispatcherServlet

            contextConfigLocation
            /WEB-INF/config/spring-servlet.xml

        1


        spring
        /

[IMAGE: https://res.cloudinary.com/hpiynhbhq/image/upload/v1516012856/sl4tmx5pf01oo2jkqofb.png]

1. configuring spring-servlet.xml
   Basic configuration of databse, view resolver and sessionfactory

    ```

            com.blog.model.Users




            ${hibernate.dialect}
            ${hibernate.show_sql}
            ${hibernate.hbm2ddl.auto}

[IMAGE: 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 list = listofStudents();   
        String json = new ObjectMapper().writeValueAsString(list);
        return json;
    }       
    List list = new ArrayList();
    public List 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;
    }
}

[IMAGE: https://res.cloudinary.com/hpiynhbhq/image/upload/v1516012892/bhzpvotg0rsp48hef9sv.png]

Result

• Lets run the project using tomcat server call the controller using ARC Client
  [IMAGE: https://res.cloudinary.com/hpiynhbhq/image/upload/v1516012493/gazows1dozstbkjuewtv.png]

• run on web browser
  [IMAGE: https://res.cloudinary.com/hpiynhbhq/image/upload/v1516012563/lfotzpxpatt59jyv3xqf.png]

• parse retuned JSON data with json parser
  [IMAGE: https://res.cloudinary.com/hpiynhbhq/image/upload/v1516012668/temdozmcxfwl8xaud9xv.png]

It's Done !
Congratulations ! we successfully developed Rest Web Service.

Thank You !

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