REST API:Login

This code from the BaseClient sample program uses the Apache wink RestClient to make a REST login request and get a sessionId. It uses uses the Apache Wink client to post the login request, and calls a utility method defined in the BaseUtil] class to extract the sessionId from the response.

<syntaxhighlight lang="java" enclose="div" style="overflow: auto">

package demo.rest;

//HTTP Classes import org.apache.wink.client.RestClient; import org.apache.wink.client.Resource; import org.apache.wink.client.ClientResponse; import org.apache.commons.httpclient.HttpStatus;

// Utility Classes import java.io.InputStream;

/*

* A base client that handles login and logout and provides utility
* methods for programs that use REST APIs.
* 
* Note:
* This class uses the Apache wink RestClient, which makes it
* pretty easy to make requests and handle responses. 
*/

public class BaseClient {

 String sessionId;
 RestClient client;
 
 String baseUrl = "http://{domain}";
 String username = "yourName";
 String password = "yourPassword";
 
 public String login()
 { 
   String url = baseUrl + "/networking/rest/login";
   String xml = "<platform>"
       + "<login>"
           + "<userName>"+username+"</userName>"
           + "<password>"+password+"</password>"
       + "</login>"
       + "</platform>";
   try
   {
     System.out.println("Logging in");
     this.client = new RestClient();
     Resource resource = client.resource(url);
     resource.contentType("application/xml");
     resource.accept("application/xml");
     ClientResponse response = resource.post(xml);
     String responseXml = response.getEntity(String.class);    
     this.sessionId = getValue("/platform/login/sessionId", responseXml);
     return this.sessionId;
   }
   catch (Exception e)
   {
     e.printStackTrace();
   }
   return null;
 }

 /*
  * Get a value from XML returned in a response.
  * 
  * @param xpath_expr  An XPATH expression. 
  *                    For example: "/platform/login/sessionId"
  *                    
  * @param xml The XML string to be parsed. Generally obtained using
  *        ClientResponse.getEntity(String.class) --Apache wink RestClient
  *        httpMethod.getResponseBodyAsString()   --Apache HttpClient
  */
 public static String getValue(String xpath_expr, String xml) 
 { 
   return BaseUtil.xpath_result(xpath_expr, xml);
 }

 // ...Other utility methods used by subclasses...

 public static void main(String args[])
 {
   BaseClient client = new BaseClient();
   String sessionId = client.login();
   System.out.println("SessionId is: " + sessionId);
   client.logout();
 }

</syntaxhighlight>