能否给我解释一下下面代码的意思?

public static String sendStatement(String sqlStatement){
    try{
        clientsocket=new Socket(synIpMain,2011);                System.out.println(sqlStatement);        os=new PrintWriter(clientsocket.getOutputStream());        is=new BufferedReader(new InputStreamReader(clientsocket.getInputStream()));                byte head[]={(byte)0x7F,(byte)0x7F,(byte)0x7F,(byte)0x7F};
                byte tail[]={(byte)0x0D};
                String sockHead= new String(head);
                String sockTail= new String(tail);                String sockHeadSql= "0000";
                int len=sqlStatement.length()+2;
                sockHeadSql=sockHeadSql+len;
                System.out.println("sockHeadSql="+sockHeadSql);
      sqlStatement=sockHead+sockHead+sockHeadSql.substring(sockHeadSql.length()-4,sockHeadSql.length())+"00000000"+sqlStatement+sockTail;
                System.out.println(sqlStatement);
        os.println(sqlStatement);
        os.flush();
        }catch(Exception e){
            try{
                                e.printStackTrace();                return "-1";
            }catch(Exception ex){
                return "-1";
            }
        }
        return "0";
}