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i am trying to add this individual constantcontact from java code using REST API ..i am attaching code written by me in tht preparing the way of content is correct or wrong i don't know ,if i run the attached servlet it displays 400 /401 error can anyone rectify this problem ..tht means plz chk my code and give changes if require ,
plz chk this attachemnt
its very very urgent,....

package com.constantcontact.webservices.sample;

import java.util.List;
import java.io.IOException;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.httpclient.HostConfiguration;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpException;
import org.apache.commons.httpclient.UsernamePasswordCredentials;
import org.apache.commons.httpclient.auth.AuthPolicy;
import org.apache.commons.httpclient.auth.AuthScope;
import org.apache.commons.httpclient.auth.DigestScheme;
import org.apache.commons.httpclient.methods.PostMethod;
import org.apache.commons.httpclient.methods.RequestEntity;
import org.apache.commons.httpclient.methods.StringRequestEntity;
import org.apache.log4j.Logger;

import com.constantcontact.webservices.sample.model.AuthDetails;
import com.constantcontact.webservices.sample.model.ContactList;
import com.constantcontact.webservices.sample.util.Constants;

public class ContactAddServlet extends HttpServlet{

private static final Logger LOG = Logger.getLogger(ContactAddServlet.class);

/**
* Handles the get request.
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
System.out.println("inside servlet..........................");
// Extract username, apikey, and password from request and create
// as credentials for use with Abdera client
AuthDetails authDetails = this.extractAuthDetails(request);
ContactList contactDetails = this.extractContactDetails(request);

UsernamePasswordCredentials credentials = new UsernamePasswordCredentials(authDetails
.getApiKey()+ "%" + authDetails.getUserName(), authDetails.getPassword());

System.out.println("credentials------- >> "+credentials.getUserName());

// HTTPClient setup
HostConfiguration hostConfiguration = new HostConfiguration();
hostConfiguration.setHost(Constants.HOST);

AuthScope authScope = new AuthScope(Constants.HOST, Constants.PORT, Constants.AUTH_REALM);

System.out.println("authScope ------host------- >> "+authScope.getHost());
System.out.println("authScope ------port------- >> "+authScope.getPort());
System.out.println("authScope ------Realm------- >> "+authScope.getRealm());

AuthPolicy.registerAuthScheme("Digest", DigestScheme.class);
System.out.println("authScope ------schema------- >> "+AuthPolicy.getDefaultAuthPrefs());

HttpClient httpClient = new HttpClient();

// This is to make HttpClient pick the Digest authentication
// scheme
List list = new ArrayList();
list.add(AuthPolicy.DIGEST);
httpClient.getParams().setParameter(AuthPolicy.AUTH_SCHEME_PRIORITY, list);
httpClient.getState().setCredentials(authScope, credentials);

StringBuffer content = new StringBuffer("activityType=").append(URLEncoder.encode("ADD_CONTACTS","UTF-8"));

content.append("&sortBy=EMAIL_ADDRESS");
content.append("&OptInSource=ACTION_BY_CONTACT");
content.append("&type=application/vnd.ctct+xml");
content.append("&EmailAddress=mohanbhimineni@gmail.com");
content.append("&FirstName=mohan");
content.append("&LastName=krishna");
content.append("&id="+contactDetails.getId());
content.append("&name="+contactDetails.getName());
content.append("&link="+contactDetails.getLink());
content.append("&shortName="+contactDetails.getOptInDefault());
content.append("&sortOrder="+contactDetails.getOptInDefault());
content.append("&optInDefault="+contactDetails.getTitle());

RequestEntity requestEntity = new StringRequestEntity(content.toString(),"application/atom+xml", "UTF-8");

System.out.println("requestEntity >>>>>>>>>>>> "+requestEntity.toString().valueOf(content));
Map postResults = this.postToServer(httpClient,authDetails,requestEntity);

// postResult will hold the URL for the created Contact if successful

if (Boolean.parseBoolean(postResults.get("success"))) {
// Make sure the authentication fields are prefilled
// by passing them back to the request.
// Create URL to redirect user to view the created Activity.
request.setAttribute(Constants.PARAM_NAME_API_KEY, authDetails.getApiKey());
request.setAttribute(Constants.PARAM_NAME_USER_NAME, authDetails.getUserName());
request.setAttribute(Constants.PARAM_NAME_PASSWORD, authDetails.getPassword());
StringBuffer redirectUrl = new StringBuffer();
redirectUrl.append("showActivity?");
redirectUrl.append(Constants.PARAM_NAME_API_KEY);
redirectUrl.append("=");
redirectUrl.append(authDetails.getApiKey());
redirectUrl.append("&");
redirectUrl.append(Constants.PARAM_NAME_USER_NAME);
redirectUrl.append("=");
redirectUrl.append(authDetails.getUserName());
redirectUrl.append("&");
redirectUrl.append(Constants.PARAM_NAME_PASSWORD);
redirectUrl.append("=");
redirectUrl.append(authDetails.getPassword());
redirectUrl.append("&activityId=");
redirectUrl.append(postResults.get("location").substring(
postResults.get("location").lastIndexOf('/') + 1));

response.sendRedirect(redirectUrl.toString());
} else {
StringBuffer errorMsg = new StringBuffer();
errorMsg.append("There has been an error: ");
errorMsg.append(postResults.get("statusCode"));
errorMsg.append(" - ");
errorMsg.append(postResults.get("statusText"));
request.setAttribute("error", errorMsg.toString());

super.getServletContext().getRequestDispatcher("/error.jsp").forward(request, response);
return;
}

}

/**
* Method handles the actual HTTP post and returns a String that holds the
* location of the created Activity if the post was successful and has an
* error message if it was unsuccessful
*
* @param client
* @param authDetails
* @param requestEntity
* @return
* @throws HttpException
* @throws IOException
*/
private Map postToServer(HttpClient client, AuthDetails authDetails,RequestEntity requestEntity) throws HttpException, IOException {
// Post to activities resource for specific Site Owner (username)
//client.put(Constants.URI + "/ws/customers/"+ authDetails.getUserName() + "/contacts", requestEntity);
PostMethod httpPost = new PostMethod(Constants.URI + "/ws/customers/"+authDetails.getUserName()+"/contacts");
Map results = new HashMap();
httpPost.setRequestEntity(requestEntity);

try {
// execute POST and capture status.
int status = client.executeMethod(httpPost);
System.out.println("status >>>>>>>>>>> "+status);

if (status >= 200 && status < 300) {
results.put("success", "true");
results.put("location", httpPost.getResponseHeader("Location").getValue());
} else {
results.put("success", "false");
results.put("statusCode", String.valueOf(status));
results.put("statusText", httpPost.getStatusText());
}
} finally {
// release any connection resources used by the method
httpPost.releaseConnection();
}
return results;
}

/**
* Method extracts Contact fields from the request object and returns
* them in a Map
*
* @param request
* @return
*/
protected ContactList extractContactDetails(HttpServletRequest request) {
ContactList contactDetails = new ContactList();
/*contactDetails.setId(request.getParameter(Constants.PARAM_NAME_ID));
contactDetails.setName(request.getParameter(Constants.PARAM_NAME_NAME));
contactDetails.setLink( request.getParameter(Constants.PARAM_NAME_LINK));
contactDetails.setTitle(request.getParameter(Constants.PARAM_NAME_TITLE));
contactDetails.setShortName(request.getParameter(Constants.PARAM_NAME_SHORT_NAME));
contactDetails.setSortOrder(0);
contactDetails.setOptInDefault(request.getParameter(Constants.PARAM_NAME_OPT_DEF));*/

contactDetails.setId("http://api.constantcontact.com/ws/customers/epost2mohan/contacts/1");
contactDetails.setName("mohan");
contactDetails.setLink("/ws/customers/epost2mohan/contacts/1");
contactDetails.setTitle("Add contacts");
contactDetails.setShortName("mohan");
contactDetails.setSortOrder(1);
contactDetails.setOptInDefault("aaaa");

return contactDetails;
}

/**
* Method extracts authentication fields from the request object and returns
* them in a Map
*
* @param request
* @return
*/
protected AuthDetails extractAuthDetails(HttpServletRequest request) {
AuthDetails authDetails = new AuthDetails();
authDetails.setApiKey(request.getParameter(Constants.PARAM_NAME_API_KEY));
authDetails.setUserName( request
.getParameter(Constants.PARAM_NAME_USER_NAME));
authDetails.setPassword( request
.getParameter(Constants.PARAM_NAME_PASSWORD));

return authDetails;
}

}