MongoDB是介于关系数据库和非关系数据库之间的一种产品，文件的存储格式为BSON（一种JSON的扩展）,这里就主要介绍Java通过使用mongo-2.7.3.jar包实现mongodb连接池，具体的java代码实现如下：
数据库连接池配置参数：
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/** *@Description: mongo连接池配置文件 */package cn.lulei.mongo.pool; public class MongoConfig { private static String userName;//用户名 private static String pwd;//密码 private static String[] host;//主机地址 private static int[] port;//端口地址 private static String dbName;//数据库名 private static int connectionsPerHost = 20;//每台主机最大连接数 private static int threadsAllowedToBlockForConnectionMultiplier = 10;//线程队列数 private static boolean authentication = false;//是否需要身份验证 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; } } |
数据库连接池管理类：
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/** *@Description: mongo数据库连接池管理类 */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 * 实例化dbName一个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()); } } /** * 使用配置参数实例化 */ public MongoManager() { this(MongoConfig.getDbName(), MongoConfig.getUserName(), MongoConfig.getPwd()); } /** * @param tableName * @return * @Description: 获取表tableName的链接DBCollection */ public DBCollection getDBCollection(String tableName) { return db.getCollection(tableName); } /** * @Description: mongo连接池初始化 */ 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 { //服务列表 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])); } //连接池参数设置 MongoOptions options = new MongoOptions(); options.connectionsPerHost = MongoConfig.getConnectionsPerHost(); options.threadsAllowedToBlockForConnectionMultiplier = MongoConfig.getThreadsAllowedToBlockForConnectionMultiplier(); mongo = new Mongo(replicaSetSeeds, options); //从服务器可读 mongo.setReadPreference(ReadPreference.SECONDARY); } catch (Exception e){ e.printStackTrace(); } } } |
下面通过一个简单的测试类，来看下如何使用这个连接池~
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/** *@Description:mongo测试 */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"); } } |
在使用上述管理类时，只需要初始化MongoConfig类即可。对类MongoManager的实例话，既可以使用MongoConfig的配置也可以自己通过参数来设置，每次获取DBCollection 时，只需要调用getDBCollection(String tableName)方法即可。
以上就是本文的全部内容，希望本文所述对大家学习java程序设计有所帮助。
