Integrating Microsoft Exchange Server with Web Applications in Java

Introduction

Recently in one of the projects I have been working I had a requirement to provide email address search where the backend email server was a Microsoft Exchange Server.  After trying several options, came across the open source java api, ews-java-api.  While getting started guide was pretty good, did not provide examples for searching the email addresses, which was my primary requirement.  Having searched the web for several hours then came across the commercial product, Jwebservices for Exchange.  This product provided a trial license for 30 days, and is relatively inexpensive compared with the hourly rates billed by developers.  The product has nice organized examples.  While trying the example code, it was observed that the class names in the commercial products were very similar to the open source API.  Based on the examples I was able to make some simple changes and use it in my web application for searching the email addresses.  Presented here is the sample code I was able to use within my application.

Sample Code

Following is the sample code I used:

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import microsoft.exchange.webservices.data.core.ExchangeService;
import microsoft.exchange.webservices.data.core.enumeration.misc.ExchangeVersion;
import microsoft.exchange.webservices.data.credential.ExchangeCredentials;
import microsoft.exchange.webservices.data.credential.WebCredentials;
import microsoft.exchange.webservices.data.misc.NameResolution;
import microsoft.exchange.webservices.data.misc.NameResolutionCollection;
import microsoft.exchange.webservices.data.property.complex.EmailAddress;


public class MyExchangeService {

private ExchangeService service;

public MyExchangeService(String emailAddress, String password) {
service = new ExchangeService(ExchangeVersion.Exchange2010_SP2);
ExchangeCredentials credentials = new WebCredentials(emailAddress, password);
service.setCredentials(credentials);

try {
service.autodiscoverUrl(emailAddress);
} catch (Exception e) {
e.printStackTrace();
}
}

public List<EmailAddress> getEmailsAddress(String searchString) {
List<EmailAddress> emailAddresses = new ArrayList<>();
try {
NameResolutionCollection response = service.resolveName(searchString);
if(searchString.startsWith(". ")) {
Iterator<NameResolution> iterator = response.iterator();
while(iterator.hasNext()) {
NameResolution nameResolution = iterator.next();
emailAddresses.add(nameResolution.getMailbox());
}

} else {
Iterator<NameResolution> iterator = response.iterator();
while(iterator.hasNext()) {
NameResolution nameResolution = iterator.next();
emailAddresses.add(nameResolution.getMailbox());
}
}
} catch (Exception e) {
e.printStackTrace();
}

return emailAddresses;
}

public static void main(String[] args) {
final String EMAILADDRESS = "nonone@nowhere.none";
final String PASSWORD = "secret";

MyExchangeService myExchangeService = new MyExchangeService(EMAILADDRESS, PASSWORD);

String searchString = ". AC";
searchString = "somoone@somewhere.com";
List<EmailAddress> emailAddresses = myExchangeService.getEmailsAddress(searchString);

for(EmailAddress emailAddress : emailAddresses) {
System.out.println(emailAddress);
}
}
}

Performance

Compared with the commercial product the open source version is a little bit slower.  But for requirement the open source code worked.  I did not have to goto my project sponsor for $500/-