package com.test.DB;import java.sql.*;import java.util.*;import com.test.DB.DBConnPool;/*連接池管理類,可以管理多個數據庫連接池*/public class DBConnManager {        //連接池名列表        private Vector poolnames = new Vector();        //驅動程序名列表        private Vector drivernames = new Vector();        //數據庫標識列表        private Vector dbids = new Vector();        //用戶名列表        private Vector usernames = new Vector();        //密碼列表        private Vector passwds = new Vector();        //最大連接數列表        private Vector maxconns = new Vector();        //連接池隊列        private Hashtable connPools = new Hashtable();        public DBConnManager() {                //添加mysql數據庫的連接信息                poolnames.addElement("mysql");                drivernames.addElement("org.gjt.mm.mysql.Driver");                dbids.addElement("jdbc:mysql://localhost/testmysql");                usernames.addElement("root");                passwds.addElement("");                maxconns.addElement("10");                //添加access數據庫的連接信息                poolnames.addElement("access");                drivernames.addElement("sun.jdbc.odbc.JdbcOdbcDriver");                dbids.addElement("jdbc:odbc:userlink");                usernames.addElement("");                passwds.addElement("");                maxconns.addElement("5");                //創建連接池                createPools();        }        /*將連接返回給由指定的連接池*/        public void releaseConnection(String name, Connection con) {                DBConnPool pool = (DBConnPool) connPools.get(name);                if (pool != null)                        pool.releaseConnection(con);        }        /*得到一個指定連接池中的連接*/        public Connection getConnection(String name) {                DBConnPool pool = (DBConnPool) connPools.get(name);                if (pool != null)                        return pool.getConnection();                return null;        }        /*關閉所有連接*/        public synchronized void closeConns() {                Enumeration allPools = connPools.elements();                while (allPools.hasMoreElements()) {                        DBConnPool pool = (DBConnPool) allPools.nextElement();                        pool.closeConn();                }        }        /*創建連接池*/        private void createPools() {                for(int i = 0; i<poolnames.size();i++){                        String poolname = poolnames.elementAt(i).toString();                        String drivername = drivernames.elementAt(i).toString();                        String dbid = dbids.elementAt(i).toString();                        String username = usernames.elementAt(i).toString();                        String passwd = passwds.elementAt(i).toString();                        int maxconn=0;                        try {                                maxconn = Integer.parseInt(maxconns.elementAt(i).toString());                        }                        catch (NumberFormatException e) {                                e.printStackTrace();                        }                        DBConnPool pool = new DBConnPool(poolname, drivername, dbid, username, passwd, maxconn);                        connPools.put(poolname, pool);                }        }}