SVS Client Java Example

VSAC SVS API Client Java Example

This Java example is for Java developers to use and modify when they wish to make a VSAC SVS API call from within their program.

import java.io.IOException;
import java.net.URI;
import java.util.Base64;

import org.apache.http.HttpResponse;
import org.apache.http.auth.AuthScope;
import org.apache.http.auth.UsernamePasswordCredentials;
import org.apache.http.client.CredentialsProvider;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.utils.URIBuilder;
import org.apache.http.impl.client.BasicCredentialsProvider;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.util.EntityUtils;
import org.springframework.http.HttpHeaders;

public class SvsClient {

	public static void main(String[] args) throws IOException {

		String svsServerBase = "https://vsac.nlm.nih.gov/vsac/svs/";
		String username = "";
		String password = "d4c9d78b-83dc-499e-ae27-947cc00fb438"; // Assign an API key to password

		HttpClient client = HttpClientBuilder.create().build();

		try {
			
			String valueToEncode = username + ":" + password;
		    String basicAuthHeader =  "Basic " + Base64.getEncoder().encodeToString(valueToEncode.getBytes());		
		    
		    
			String testUrl = svsServerBase + "RetrieveMultipleValueSets";

			HttpGet httpGet = new HttpGet(testUrl);
			URI uri = new URIBuilder(httpGet.getURI()).addParameter("id", "2.16.840.1.113762.1.4.1029.256").build(); // VSAC OID example
			httpGet.setURI(uri);
			
			httpGet.setHeader(HttpHeaders.AUTHORIZATION, basicAuthHeader);

			HttpResponse response = client.execute(httpGet);
			String responseString = EntityUtils.toString(response.getEntity());
			System.out.println(responseString);

			
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}