package utils;import java.net.UnknownHostException;import java.util.ArrayList;import java.util.List;import org.bson.Document;import org.bson.conversions.Bson;import org.bson.types.ObjectId;import com.mongodb.BasicDBObject;import com.mongodb.MongoClient;import com.mongodb.MongoClientOptions;import com.mongodb.MongoClientOptions.Builder;import com.mongodb.WriteConcern;import com.mongodb.client.MongoCollection;import com.mongodb.client.MongoCursor;import com.mongodb.client.MongoDatabase;import com.mongodb.client.MongoIterable;import com.mongodb.client.model.Filters;import com.mongodb.client.result.DeleteResult;/** * MongoDB工具类 Mongo实例代表了一个数据库连接池，即使在多线程的环境中，一个Mongo实例对我们来说已经足够了<br> * 注意Mongo已经实现了连接池，并且是线程安全的。 <br> * 设计为单例模式， 因 MongoDB的Java驱动是线程安全的，对于一般的应用，只要一个Mongo实例即可，<br> * Mongo有个内置的连接池（默认为10个） 对于有大量写和读的环境中，为了确保在一个Session中使用同一个DB时，<br> * DB和DBCollection是绝对线程安全的<br> *  * @author gonglei 使用mongo-java-driver-3.0.2连接MongoDB数据库 * @date 2017-3-16 * @version 0.0.0 * @Copyright (c)2017-2018  */public enum MongoDBUtil {    /**     * 定义一个枚举的元素，它代表此类的一个实例     */    instance;    private MongoClient mongoClient;    static {                System.out.println("===============MongoDBUtil初始化========================");                /*        CompositeConfiguration config = new CompositeConfiguration();        try {            config.addConfiguration(new PropertiesConfiguration("mongodb.properties"));        } catch (ConfigurationException e) {            e.printStackTrace();        }        */                // 从配置文件中获取属性值        String ip = utils.getWriteProperties.GetValueByKey("db.properties", "host");        int port = Integer.parseInt(utils.getWriteProperties.GetValueByKey("db.properties", "port"));        //      //默认写死//      String ip ="127.0.0.1";//      int port=27017;                instance.mongoClient = new MongoClient(ip, port);                // or, to connect to a replica set, with auto-discovery of the primary, supply a seed list of members        // List<ServerAddress> listHost = Arrays.asList(new ServerAddress("localhost", 27017),new ServerAddress("localhost", 27018));        // instance.mongoClient = new MongoClient(listHost);                // 大部分用户使用mongodb都在安全内网下，但如果将mongodb设为安全验证模式，就需要在客户端提供用户名和密码：        // boolean auth = db.authenticate(myUserName, myPassword);        Builder options = new MongoClientOptions.Builder();        // options.autoConnectRetry(true);// 自动重连true        // options.maxAutoConnectRetryTime(10); // the maximum auto connect retry time        options.connectionsPerHost(300);// 连接池设置为300个连接,默认为100        options.connectTimeout(15000);// 连接超时，推荐>3000毫秒        options.maxWaitTime(5000); //        options.socketTimeout(0);// 套接字超时时间，0无限制        options.threadsAllowedToBlockForConnectionMultiplier(5000);// 线程队列数，如果连接线程排满了队列就会抛出“Out of semaphores to get db”错误。        options.writeConcern(WriteConcern.SAFE);//        options.build();    }    // -----------------------------------共用方法---------------------------------------------------    /**     * 获取DB实例 - 指定DB     *      * @param dbName     * @return     */    public MongoDatabase getDB(String dbName) {        if (dbName != null && !"".equals(dbName)) {            MongoDatabase database = mongoClient.getDatabase(dbName);                        return database;        }        return null;    }    /**     * 获取collection对象 - 指定Collection     *      * @param collName     * @return     */    public MongoCollection<Document> getCollection(String dbName, String collName) {        if (null == collName || "".equals(collName)) {            return null;        }        if (null == dbName || "".equals(dbName)) {            return null;        }        MongoCollection<Document> collection = mongoClient.getDatabase(dbName).getCollection(collName);        return collection;    }    /**     * 查询DB下的所有表名     */    public List<String> getAllCollections(String dbName) {        MongoIterable<String> colls = getDB(dbName).listCollectionNames();        List<String> _list = new ArrayList<String>();        for (String s : colls) {            _list.add(s);        }        return _list;    }    /**     * 获取所有数据库名称列表     *      * @return     */    public MongoIterable<String> getAllDBNames() {        MongoIterable<String> s = mongoClient.listDatabaseNames();        return s;    }    /**     * 删除一个数据库     */    public void dropDB(String dbName) {        getDB(dbName).drop();    }    /**     * 查找对象 - 根据主键_id     *      * @param collection     * @param id     * @return     */    public Document findById(MongoCollection<Document> coll, String id) {        ObjectId _idobj = null;        try {            _idobj = new ObjectId(id);        } catch (Exception e) {            return null;        }        Document myDoc = coll.find(Filters.eq("_id", _idobj)).first();        return myDoc;    }    /** 统计数 */    public int getCount(MongoCollection<Document> coll) {        int count = (int) coll.count();        return count;    }    /** 条件查询 */    public MongoCursor<Document> find(MongoCollection<Document> coll, Bson filter) {        return coll.find(filter).iterator();    }    /** 分页查询 */    public MongoCursor<Document> findByPage(MongoCollection<Document> coll, Bson filter, int pageNo, int pageSize) {        Bson orderBy = new BasicDBObject("_id", 1);        return coll.find(filter).sort(orderBy).skip((pageNo - 1) * pageSize).limit(pageSize).iterator();    }    /**     * 通过ID删除     *      * @param coll     * @param id     * @return     */    public int deleteById(MongoCollection<Document> coll, String id) {        int count = 0;        ObjectId _id = null;        try {            _id = new ObjectId(id);        } catch (Exception e) {            return 0;        }        Bson filter = Filters.eq("_id", _id);        DeleteResult deleteResult = coll.deleteOne(filter);        count = (int) deleteResult.getDeletedCount();        return count;    }    /**     * FIXME     *      * @param coll     * @param id     * @param newdoc     * @return     */    public Document updateById(MongoCollection<Document> coll, String id, Document newdoc) {        ObjectId _idobj = null;        try {            _idobj = new ObjectId(id);        } catch (Exception e) {            return null;        }        Bson filter = Filters.eq("_id", _idobj);        // coll.replaceOne(filter, newdoc); // 完全替代        coll.updateOne(filter, new Document("$set", newdoc));        return newdoc;    }        public void dropCollection(String dbName, String collName) {        getDB(dbName).getCollection(collName).drop();    }        /**     * 关闭Mongodb     */    public void close() {        if (mongoClient != null) {            mongoClient.close();            mongoClient = null;                    }              System.out.println("===============MongoDBUtil关闭连接========================");            }

    /**     * 测试插入数据库     *      * @param args     */
      public static void write(String HL7Msg)
      {
      String dbName = "testDBName";

      String collName = "testcollName";

       MongoCollection<Document> coll = MongoDBUtil.instance.getCollection(dbName, collName);

      //插入
       Document doc = new Document();
       doc.put("MsgID", "MSH-10");
       doc.put("HL7Body", HL7Msg );
       coll.insertOne(doc);
       }

/**     * 测试入口     *      * @param args     */    public static void main(String[] args) {                String dbName = "testDBName";        String collName = "testcollName";        MongoCollection<Document> coll = MongoDBUtil.instance.getCollection(dbName, collName);        //         //插入多条//         for (int i = 1; i <= 4; i++) {//             Document doc = new Document();//             doc.put("name", "yisheng");//             doc.put("school", "NEFU" + i);//             Document interests = new Document();//             interests.put("game", "game" + i);//             interests.put("ball", "ball" + i);//             doc.put("interests", interests);//             coll.insertOne(doc);//         }         // 根据ID查询         String id = "58caa7c21320c81bbcfc5593";         Document doc = MongoDBUtil.instance.findById(coll, id);         System.out.println(doc);//         //查询多个//         MongoCursor<Document> cursor1 = coll.find(Filters.eq("name", "yisheng")).iterator();//         while (cursor1.hasNext()) {//         org.bson.Document _doc = (Document) cursor1.next();//         System.out.println(_doc.toString());//         }//         cursor1.close();           // 查询多个           // MongoCursor<Person> cursor2 = coll.find(Person.class).iterator();//         //删除数据库//         MongoDBUtil.instance.dropDB("testDBName");           //删除表           //MongoDBUtil2.instance.dropCollection(dbName, collName);//         //修改数据//         String id = "58caa6041320c814f4520129";//         Document newdoc = new Document();//         newdoc.put("name", "龚lei");//         MongoDBUtil.instance.updateById(coll, id, newdoc);                       //统计表           //System.out.println(MongoDBUtil.instance.getCount(coll));           //         //查询所有//         Bson filter = Filters.eq("count", 0);//         MongoDBUtil.instance.find(coll, filter);               }}