java实现mongodb的数据库连接池

 /**  *@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;  } } 

 /**  *@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();   }  } } 

 /**  *@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");  }  }