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java实现mongodb的数据库连接池

来源: jb51  作者: 佚名

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:

/**
*@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:

/**
*@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~

/**
*@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。

Tags:数据库
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