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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），关于MongoDB的其他介绍请参考百度百科 http://baike.baidu.com/subview/3385614/9338179.htm
关于mongodb的下载安装以及一些基本的命令操作可以参照 http://user.qzone.qq.com/425627233/2
这里就主要介绍一样在Java中通过使用mongo-2.7.3.jar这个jar包实现mongodb连接池的实现，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
* @Date:2014-3-19
* @Author:lulei
* @Description: 获取表tableName的链接DBCollection
*/
public DBCollection getDBCollection(String tableName) {
return db.getCollection(tableName);
}
/**
* @Date:2014-3-19
* @Author:lulei
* @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