JAVA简单问题

我重新在工程下创建了一个包，包里写了一个类；是为了节省代码量而写的JDBC语句。Java code:
package com.bbs.DBConnecion;

import java.sql.*;

public class ConnectionDB {

public static Connection getConnection(){
Connection conn=null;
try {
Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
try {
conn=DriverManager.getConnection("jdbc:sqlserver://localhost:1433;DatabaseName=bbsDB","fanxiang","12345");
} catch (SQLException e) {
e.printStackTrace();
}
return conn;

}

public static void closeConnection(Connection DBConnection){
try {
if(DBConnection!=null&&(!DBConnection.isClosed())){
DBConnection.close();
}
} catch (SQLException e) {
e.printStackTrace();
}
}
public static void closeResultSet(ResultSet rs){
if(rs!=null){
try {
rs.close();
} catch (SQLException e) {
e.printStackTrace();
}
rs=null;
}