jdbc，关闭连接工具类

/**
* 关闭connection连接
* @param conn
*/
public static void closeConnection(Connection conn){
if(conn != null){
try{
conn.close();
}catch(Exception ex){}
}
}

public static void closeConnection(
Connection conn,Statement stat){
//释放stat
if(stat != null){
try{
stat.close();
}catch(Exception ex){}
}
//释放con
closeConnection(conn);
}

public static void closeConnection(
Connection conn,Statement stat,ResultSet rs){
//释放rs
if(rs != null){
try{
rs.close();
}catch(Exception ex){}
}
//释放stat,conn
closeConnection(conn,stat);
}