代码如下：

import microsoft.exchange.webservices.data.ConnectingIdType;
import microsoft.exchange.webservices.data.EmailMessage;
import microsoft.exchange.webservices.data.ExchangeCredentials;
import microsoft.exchange.webservices.data.ExchangeService;
import microsoft.exchange.webservices.data.ExchangeVersion;
import microsoft.exchange.webservices.data.FindItemsResults;
import microsoft.exchange.webservices.data.Folder;
import microsoft.exchange.webservices.data.ImpersonatedUserId;
import microsoft.exchange.webservices.data.Item;
import microsoft.exchange.webservices.data.ItemSchema;
import microsoft.exchange.webservices.data.ItemView;
import microsoft.exchange.webservices.data.SortDirection;
import microsoft.exchange.webservices.data.WebCredentials;
import microsoft.exchange.webservices.data.WellKnownFolderName;
import net.sf.json.JSONArray;
import net.sf.json.JSONObject;

public class ExchangeMailUtil {
    public static void main(String[] args) {
        String aduser = "aaa";
        String adpass = "aaa";
        String addomain = "xxxx.com.cn";
        String suffix = "@xxxx.com.cn";
        String uri = "https://mail.xxxx.com.cn/ews/exchange.asmx";
        // 要查询的邮箱名称，不带后缀
        String sid = "xiaoming";

        try {
            String count = getCount(aduser, adpass, addomain, uri, suffix, sid);
//            System.out.println("count=" + count);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static String getCount(String aduser, String adpass, String addomain, String uri, String suffix, String sid)
            throws Exception {
        String count = "0";
        ExchangeService service = new ExchangeService(ExchangeVersion.Exchange2010_SP1);
        ExchangeCredentials credentials = new WebCredentials(aduser, adpass, addomain);
        // ExchangeCredentials credentials = new WebCredentials("bbbb",
        // "Aa123456","fr");
        service.setCredentials(credentials);
        ImpersonatedUserId other = new ImpersonatedUserId(ConnectingIdType.SmtpAddress, sid + suffix);
        service.setImpersonatedUserId(other);
        service.setUrl(new URI(uri));
        service.setTraceEnabled(true);
        // 服务地址ַ
        try {
            // 获取收件箱
            Folder inbox = Folder.bind(service, WellKnownFolderName.Inbox);

            //System.out.println("未读邮件数：" + inbox.getUnreadCount());

            count = inbox.getUnreadCount() + " ";
        } catch (Exception e) {
            e.printStackTrace();
        }
        return count;
    }
    
    public static JSONObject getMailList(String aduser, String adpass, String addomain, 
            String uri, String suffix, String sid,int rowsize) throws Exception {
        JSONObject result = new JSONObject();
        //ExchangeService版本
        ExchangeService service = new ExchangeService(ExchangeVersion.Exchange2010_SP1);
        //用户名、密码、域
        ExchangeCredentials credentials = new WebCredentials(aduser, adpass, addomain);
        service.setCredentials(credentials);
        ImpersonatedUserId other = new ImpersonatedUserId(ConnectingIdType.SmtpAddress, sid + suffix);
        service.setImpersonatedUserId(other);
        service.setUrl(new URI(uri));
        service.setTraceEnabled(true);
        // 服务地址ַ
        try {
            // 获取收件箱
            Folder inbox = Folder.bind(service, WellKnownFolderName.Inbox);
            //创建过滤器条件，查询几封邮件
            ItemView view = new ItemView(rowsize);
            //按照时间顺序收取
            view.getOrderBy().add(ItemSchema.DateTimeReceived, SortDirection.Descending);
            //查询
            FindItemsResults<Item> findResults = service.findItems(inbox.getId(), view);
            JSONArray arr = new JSONArray();
            for (Item item : findResults.getItems()) {
                EmailMessage message = EmailMessage.bind(service, item.getId());
                message.load();
                JSONObject json = new JSONObject();
                json.put("title", message.getSubject()); // 邮件标题
                json.put("sender", message.getSender().getName()); // 发件人
                json.put("date", DateUtil.convertDateToString(message.getDateTimeReceived(), DateUtil.PATTERN_DATETIME)); // 接收时间
                json.put("url", message.getSender().getAddress()); // 链接
                //System.out.println(message.getSender());
                //System.out.println("Sub -->" + item.getSubject());
                arr.add(json);
            }
            result.put("data", arr);
            return result;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }
}