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java实现mongodb的数据库连接池

2019年07月22日  | 移动技术网IT编程  | 我要评论

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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。

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