读取XML,该怎么处理

private Map read(InputStream is) {        Map map = new HashMap();        try {            Document d = DocumentBuilderFactory.newInstance()                    .newDocumentBuilder().parse(is);            Element root = d.getDocumentElement();            NodeList nList = root.getElementsByTagName("client");            String name, value = null;            for (int i = 0; i < nList.getLength(); i++) {                NodeList nList2 = nList.item(i).getChildNodes();                for (int j = 0; j < nList2.getLength(); j++) {                    name = nList2.item(j).getNodeName();// /nList2:port,location,ip                    if (!name.equals("#text")) {                        if (d.getElementsByTagName(name).item(i)                                .getFirstChild() != null) {                            value = d.getElementsByTagName(name).item(i)                                    .getFirstChild().getNodeValue();                        } else {                            value = "";                        }                        map.put(name, value);                    }                }            }        } catch (Exception e) {        }        return map;    }