Dependency Injection of REST in Spring

The configurations required in the Application context file is as below:

  

In the referencing bean where we need to inject restTemplate we can add a property for the restTemplate as shown below:

The code for invoking REST url would be :

..

if (HttpMethod.GET == method) {

requestCallback = new AcceptHeaderRequestCallback(String.class);

} else {

HttpHeaders headers = new HttpHeaders();

headers.setContentType(MediaType.APPLICATION_XML);

HttpEntity requestEntity = new HttpEntity(body, headers);

requestCallback = new HttpEntityRequestCallback(requestEntity, String.class);

}

HttpMessageConverterExtractor responseExtractor =

new HttpMessageConverterExtractor(String.class, restTemplate.getMessageConverters(), loggerCommons);

String resp = null;

try {

resp = restTemplate.execute(baseUrl + uri, method, requestCallback, responseExtractor, urlVariablesFromReq);

The java doc of this api is:

<String> String org.springframework.web.client.RestTemplate.execute(String url, HttpMethod method, RequestCallback requestCallback, ResponseExtractor<String> responseExtractor, Map<String, ?> urlVariables) throws RestClientException

Execute the HTTP method to the given URI template, preparing the request with the RequestCallback, and reading the response with a ResponseExtractor.
URI Template variables are expanded using the given URI variables map.

Specified by: execute(...) in RestOperations

Parameters:

url the URL

method the HTTP method (GET, POST, etc)

requestCallback object that prepares the request

responseExtractor object that extracts the return value from the response

urlVariables the variables to expand in the template

Returns:

an arbitrary object, as returned by the ResponseExtractor

Throws:

RestClientException