java實現mongodb的數據庫連接池

MongoDB是介於關係數據庫和非關係數據庫之間的一種產品，文件的存儲格式為BSON（一種JSON的擴展）,這裡就主要介紹Java通過使用mongo-2.7.3.jar包實現mongodb連接池，具體的java代碼實現如下：

數據庫連接池配置參數：

 /** *@Description: mongo連接池配置文件*/ package cn.lulei.mongo.pool; public class MongoConfig { private static String userName;//用戶名private static String pwd;//密碼private static String[] host;//主機地址private static int[] port;//端口地址private static String dbName;//數據庫名private static int connectionsPerHost = 20;//每台主機最大連接數private static int threadsAllowedToBlockForConnectionMultiplier = 10;//線程隊列數private static boolean authentication = false;//是否需要身份驗證public static String getUserName() { return userName; } public static void setUserName(String userName) { MongoConfig.userName = userName; } public static String getPwd() { return pwd; } public static void setPwd(String pwd) { MongoConfig.pwd = pwd; } public static String[] getHost() { return host; } public static void setHost(String[] host) { MongoConfig.host = host; } public static int[] getPort() { return port; } public static void setPort(int[] port) { MongoConfig.port = port; } public static String getDbName() { return dbName; } public static void setDbName(String dbName) { MongoConfig.dbName = dbName; } public static int getConnectionsPerHost() { return connectionsPerHost; } public static void setConnectionsPerHost(int connectionsPerHost) { MongoConfig.connectionsPerHost = connectionsPerHost; } public static int getThreadsAllowedToBlockForConnectionMultiplier() { return threadsAllowedToBlockForConnectionMultiplier; } public static void setThreadsAllowedToBlockForConnectionMultiplier( int threadsAllowedToBlockForConnectionMultiplier) { MongoConfig.threadsAllowedToBlockForConnectionMultiplier = threadsAllowedToBlockForConnectionMultiplier; } public static boolean isAuthentication() { return authentication; } public static void setAuthentication(boolean authentication) { MongoConfig.authentication = authentication; } }

數據庫連接池管理類：

 /** *@Description: mongo數據庫連接池管理類*/ package cn.lulei.mongo.pool; import java.util.ArrayList; import java.util.List; import com.mongodb.DB; import com.mongodb.DBCollection; import com.mongodb.Mongo; import com.mongodb.MongoOptions; import com.mongodb.ReadPreference; import com.mongodb.ServerAddress; public class MongoManager { private static Mongo mongo; private DB db; static{ init(); } /** * @param dbName * @param userName * @param pwd * 實例化dbName一個DB */ public MongoManager(String dbName, String userName, String pwd) { if (dbName == null || "".equals(dbName)) { throw new NumberFormatException("dbName is null"); } db = mongo.getDB(dbName); if(MongoConfig.isAuthentication() && !db.isAuthenticated()){ if (userName == null || "".equals(userName)) { throw new NumberFormatException("userName is null"); } if (pwd == null || "".equals(pwd)) { throw new NumberFormatException("pwd is null"); } db.authenticate(userName, pwd.toCharArray()); } } /** * 使用配置參數實例化*/ public MongoManager() { this(MongoConfig.getDbName(), MongoConfig.getUserName(), MongoConfig.getPwd()); } /** * @param tableName * @return * @Description: 獲取表tableName的鏈接DBCollection */ public DBCollection getDBCollection(String tableName) { return db.getCollection(tableName); } /** * @Description: mongo連接池初始化*/ private static void init() { if (MongoConfig.getHost() == null || MongoConfig.getHost().length == 0) { throw new NumberFormatException("host is null"); } if (MongoConfig.getPort() == null || MongoConfig.getPort().length == 0) { throw new NumberFormatException("port is null"); } if (MongoConfig.getHost().length != MongoConfig.getPort().length) { throw new NumberFormatException("host's length is not equals port's length"); } try { //服務列表List<ServerAddress> replicaSetSeeds = new ArrayList<ServerAddress>(); for (int i = 0; i < MongoConfig.getHost().length; i++) { replicaSetSeeds.add(new ServerAddress(MongoConfig.getHost()[i], MongoConfig.getPort()[i])); } //連接池參數設置MongoOptions options = new MongoOptions(); options.connectionsPerHost = MongoConfig.getConnectionsPerHost(); options.threadsAllowedToBlockForConnectionMultiplier = MongoConfig.getThreadsAllowedToBlockForConnectionMultiplier(); mongo = new Mongo(replicaSetSeeds, options); //從服務器可讀mongo.setReadPreference(ReadPreference.SECONDARY); } catch (Exception e){ e.printStackTrace(); } } }

下面通過一個簡單的測試類，來看下如何使用這個連接池~

 /** *@Description:mongo測試*/ package cn.lulei.mongo.test; import cn.lulei.mongo.pool.MongoConfig; import cn.lulei.mongo.pool.MongoManager; public class Test { public static void main(String[] args) { // TODO Auto-generated method stub String[] host = {"127.0.0.1"}; int[] port = {27001}; MongoConfig.setHost(host); MongoConfig.setPort(port); MongoConfig.setDbName("novel"); MongoManager mongoManager = new MongoManager(); mongoManager.getDBCollection("chapter"); } }

在使用上述管理類時，只需要初始化MongoConfig類即可。對類MongoManager的實例話，既可以使用MongoConfig的配置也可以自己通過參數來設置，每次獲取DBCollection 時，只需要調用getDBCollection(String tableName)方法即可。

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