How do you consume a RESTFUL webservice?

###########################

######Rest Provider code#####

##########################

@Controller

@Scope("request")

@RequestMapping(value = "/v1/program")

public class ProgramController {

@Autowired

@Qualifier("ProgramService")

private IProgramService iProgramService;

@RequestMapping(value = ProgramURIConstant.ADD_PROGRAM, method = RequestMethod.POST, produces = { MediaType.APPLICATION_JSON_VALUE })

public @ResponseBody

String addProgram(@RequestBody ProgramVO programVO) {

programVO.setTimestamp(DateUtils.getCurrentTimeIntoTimestamp());

String result = iProgramService.addProgram(programVO);

return result;

}

}

 Step-1

 Access the RestTemplate Bean

<beans>

<bean id="crestTemplate" class="org.springframework.web.client.RestTemplate">

</bean>          

</beans> 

ApplicationContext applicationContext = new ClassPathXmlApplicationContext("rest-template.xml");

RestTemplate restTemplate = (RestTemplate) applicationContext.getBean("crestTemplate"); 

 Step-2

Define Accept Media (Which is responsible for output format from Restful Web service)

List<MediaType> acceptableMediaTypes = new ArrayList<MediaType>();

acceptableMediaTypes.add(MediaType.APPLICATION_JSON);

Step-3

Creating HttpHeader object

HttpHeaders headers = new HttpHeaders();

Step-4

Setting Accept media inside the header

// what output we are expecting

headers.setAccept(acceptableMediaTypes);

Step-5

Setting Content Type iinside the header

// /We are setting the format of data which will from client to server

headers.setContentType(MediaType.APPLICATION_JSON);

Step-6

Define JSON Data which we want to send to the provider

ProgramVO programVO=new ProgramVO();

programVO.setCode("fororueueueueu");

programVO.setId("P039393");

programVO.setLanguage("Kava");

programVO.setLevel("1");

programVO.setProgramTiitle("Binary Nuber");

programVO.setTopic("Coding");

programVO.setUserid("akash");

Step-7

// setting header and data inside the HttpEntity which will work as a request

//in Restful communication

HttpEntity<ProgramVO> requestEntity = new HttpEntity<ProgramVO>(programVO,headers);

Step-8

Calling the Restful web service

ResponseEntity<String> response = restTemplate.exchange("http://www.gpsprogramys.co.in/com.gps.quiz/android/v1/program/add", HttpMethod.POST, requestEntity,String.class);

String output=response.getBody();