工具类
public class MongoDBDao {
    /**
     * 获取MONGODB客户端实例
     * 
     * @return
     * @throws Exception
     */
    public static MongoClient getMongoClient() throws Exception {
        try {
            // 解密用密钥
            String sKey = SysPropertyJdbc.getProperty("jdbc.deskey")
                    .substring(4, 28);

            String sIp = DESUtil.decryptMode(sKey,
                    MongoDBProperty.getProperty("mip"));
            int iPort = Integer.valueOf(DESUtil.decryptMode(sKey,
                    MongoDBProperty.getProperty("mport")));
            String sUser = DESUtil.decryptMode(sKey,
                    MongoDBProperty.getProperty("muser"));
            String sPasword = DESUtil.decryptMode(sKey,
                    MongoDBProperty.getProperty("mpassword"));
            String sDbNm = DESUtil.decryptMode(sKey,
                    MongoDBProperty.getProperty("mdb"));

            // ===================================================//
            List<ServerAddress> serverList = new ArrayList<ServerAddress>();
            serverList.add(new ServerAddress(sIp, iPort));
            // ===================================================//
            List<MongoCredential> mcList = new ArrayList<MongoCredential>();
            mcList.add(MongoCredential.createCredential(sUser, sDbNm,
                    sPasword.toCharArray()));
            // ===================================================//
            MongoClientOptions.Builder builder = MongoClientOptions.builder();
            // 与目标数据库能够建立的最大connection数量为50
            builder.connectionsPerHost(50);
            // 如果当前所的connection都在使用中，则每个connection上可以50个线程排队等待
            builder.threadsAllowedToBlockForConnectionMultiplier(50);
            // 一个线程访问数据库的时候，在成功获取到一个可用数据库连接之前的最长等待时间为2分钟
            // 这里比较危险，如果超过maxWaitTime都没获取到这个连接的话，该线程就会抛出Exception
            // 故这里设置的maxWaitTime应该足够大，以免由于排队线程过多造成的数据库访问失败
            builder.maxWaitTime(1000 * 60 * 2);
            // 与数据库建立连接的timeout设置为1分钟
            builder.connectTimeout(1000 * 60 * 1);
            // ===================================================//
            MongoClientOptions mco = builder.build();
            return new MongoClient(serverList, mcList, mco);
        } catch (Exception e) {
            throw e;
        }
    }
}


操作类
logger.debug("START...");
        int page = 0;// 滚动加载页码
        int page10 = 0;
        if (this.getPara("pagetimer") != null) {
            page = Integer.parseInt(this.getPara("pagetimer"));// 滚动加载页码
            page10 = page * 10;
        }
        String umac = this.getPara("umac");
        Calendar c = Calendar.getInstance();
        c.add(Calendar.MONTH, -1);
        // System.out.println(c.getTime()); 上个月时间
        MongoDBDao mongoDBDao = new MongoDBDao();
        MongoClient mongoClient = mongoDBDao.getMongoClient();
        MongoDatabase database = mongoClient
                .getDatabase(DESUtil.decryptMode(SysPropertyJdbc.getProperty("jdbc.deskey").substring(4, 28), MongoDBProperty.getProperty("mdb")));
        MongoCollection<Document> collection = database.getCollection("user_timeline");
        // 查询条件
        MongoCursor<Document> mongoCursor = collection.find(Filters.and(Filters.eq("umac", umac), Filters.gt("datetime", c.getTime()))).skip(page10)
                .limit(10).iterator();
        String timerShaft = "";// 返回显示项
        while (mongoCursor.hasNext()) {
            Iterator<Entry<String, Object>> iter = mongoCursor.next().entrySet().iterator();
            Date datetime = null;
            String host = "";
            String resultdate = "";
            while (iter.hasNext()) {
                Entry eTmp = iter.next();
                String sKeyTmp = eTmp.getKey().toString();
                switch (sKeyTmp) {
                case "datetime":
                    datetime = (Date) eTmp.getValue();
                    break;
                case "host":
                    host = eTmp.getValue().toString();
                    break;
                default:
                    break;
                }
                if (datetime != null) {
                    resultdate = dateDeal(datetime);
                }
            }
            timerShaft = timerShaft + "<li><div class=\"animationTime\">" + resultdate + "</div><div class=\"animationTimeN\">" + host
                    + "</div></li>";
        }
        this.setAttr("pagetimer", page);
        this.setAttr("timerShaft", timerShaft);


工具类
public class SysPropertyJdbc {
    /**
     * 初期化
     */
    private SysPropertyJdbc() throws Exception {
        this.props = new Properties();
        props.load(this.getClass().getClassLoader()
                .getResourceAsStream(PROPS_NAME));
    }
    private static final String PROPS_NAME = "jdbc.properties";
    private static SysPropertyJdbc sysProps;
    private Properties props;
    public static String getProperty(String key) throws Exception {
        return SysPropertyJdbc.getInstance().getProperties().getProperty(key);
    }
    private Properties getProperties() {
        return this.props;
    }
    private static synchronized SysPropertyJdbc getInstance() throws Exception {
        if (sysProps == null) {
            sysProps = new SysPropertyJdbc();
        }
        return sysProps;
    }
}

public class MongoDBProperty {
    private MongoDBProperty() throws Exception {
        this.props = new Properties();
        props.load(this.getClass().getClassLoader()
                .getResourceAsStream(PROPS_NAME));
    }
    private static final String PROPS_NAME = "mongodb.properties";
    private static MongoDBProperty sysProps;
    private Properties props;
    public static String getProperty(String key) throws Exception {
        return MongoDBProperty.getInstance().getProperties().getProperty(key);
    }
    private Properties getProperties() {
        return this.props;
    }
    private static synchronized MongoDBProperty getInstance() throws Exception {
        if (sysProps == null) {
            sysProps = new MongoDBProperty();
        }
        return sysProps;
    }
}