package test;
import java.sql.*;
import java.util.*;
/*连接池管理类,可以管理多个数据库连接池*/
public class DBConnManager {
//连接池名列表
private Vector poolnames = new Vector();
//驱动程序名列表
private Vector drivernames = new Vector();
//数据库标识列表
private Vector dbids = new Vector();
//用户名列表
private Vector usernames = new Vector();
//密码列表
private Vector passwds = new Vector();
//最大连接数列表
private Vector maxconns = new Vector();
//连接池队列
private Hashtable connPools = new Hashtable();
public DBConnManager() {
//添加mysql数据库的连接信息
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数据库的连接信息
poolnames.addElement("access");
drivernames.addElement("sun.jdbc.odbc.JdbcOdbcDriver");
dbids.addElement("jdbc:odbc:TestData");
usernames.addElement("");
passwds.addElement("");
maxconns.addElement("5");
//创建连接池
createPools();
}
/*将连接返回给由指定的连接池*/
public void releaseConnection(String name, Connection con) {
DBConnPool pool = (DBConnPool) connPools.get(name);
if (pool != null)
pool.releaseConnection(con);
}
/*得到一个指定连接池中的连接*/
public Connection getConnection(String name) {
DBConnPool pool = (DBConnPool) connPools.get(name);
if (pool != null)
return pool.getConnection();
return null;
}
/*关闭所有连接*/
public synchronized void closeConns() {
Enumeration allPools = connPools.elements();
while (allPools.hasMoreElements()) {
DBConnPool pool = (DBConnPool) allPools.nextElement();
pool.closeConn();
}
}
/*创建连接池*/
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);
}
}
}
其中红色部分，为什么老是提示有问题，，，，请帮帮助
