List<Map>与XML之间的转换

公司要使用XML传入数据，需要将List<Map>结构的数据转换为XML。
实现方法已经完成，贴出来备忘。
1.XML的根节点的建立
    /**
     * 类转xml方法.
     * @param data List<?>
     * @return String
     * @throws
     */
    public  String map2xml(Map map) {
        Document document = DocumentHelper.createDocument();
        Element nodesElement = document.addElement("ROOT");
        map2xml(map,nodesElement);
        return doc2String(document);
    }

     /**
     * 类转xml方法.
     * @param data List<?>
     * @return String
     * @throws
     */
    public String list2xml(List<?> list) {
        Document document = DocumentHelper.createDocument();
        Element nodesElement = document.addElement("DATA");
        list2xml(list,nodesElement);
        return doc2String(document);
    }

2.XML转String 用dom4j的功能实现
    /**
     * xml转为String.
     * @param document
     * @return
     * @throws
     */
    public String doc2String(Document document) { 
        String s = ""; 
        try { 
            // 使用输出流来进行转化 
            ByteArrayOutputStream out = new ByteArrayOutputStream(); 
            // 使用UTF-8编码 
            OutputFormat format = new OutputFormat("   ", true, "UTF-8"); 
            XMLWriter writer = new XMLWriter(out, format); 
            writer.write(document); 
            s = out.toString("UTF-8"); 
        } catch (Exception ex) { 
            ex.printStackTrace(); 
        } 
        return s; 
    }
3.List2XML方法实现
   /**
     * List2XML,目前支持List<List> List<Map> List<Map<String,List>>等只有
     * List Map 组合的数据进行转换.
     * @param list
     * @param element
     * @return
     * @throws
     */
    public Element list2xml(List list,Element element){
        int i = 0;
        for (Object o : list) {
            Element nodeElement = element.addElement("LIST");
            if (o instanceof Map) {
                nodeElement.addAttribute("type", "o");
                Map m = (Map) o;
                for (Iterator iterator = m.entrySet().iterator(); iterator.hasNext();) {
                    Entry entry = (Entry) iterator.next();
                    Element keyElement = nodeElement.addElement(entry.getKey().toString());
                    if (entry.getValue() instanceof List) {
                        keyElement.addAttribute("type", "l");
                        list2xml((List) entry.getValue(),keyElement);
                    } else {
                        keyElement.addAttribute("type", "s");
                        keyElement.setText(entry.getValue().toString());
                    }
                }
            } else if (o instanceof List) {
                nodeElement.addAttribute("type", "l");
                list2xml((List)o,nodeElement);
            }
            else {
                Element keyElement = nodeElement.addElement("value");
                keyElement.addAttribute("num", String.valueOf(i));
                keyElement.setText(String.valueOf(o));
            }
            i++;
        }
        return element;
    }

4.xml2List
    /**
     * xml转List方法.
     * @param xml
     * @return List<?>
     * @throws
     */
    public List<?> xml2List(String xml){
        try { 
            List list = new ArrayList(); 
            Document document = DocumentHelper.parseText(xml); 
            Element nodesElement = document.getRootElement(); 
            List nodes = nodesElement.elements(); 
            for (Iterator its = nodes.iterator(); its.hasNext();) { 
                Element nodeElement = (Element) its.next(); 
                if(("l").equals(nodeElement.attributeValue("type"))){
                    List s = xml2List(nodeElement.asXML());
                    list.add(s); 
                    s = null; 
                }else if(("o").equals(nodeElement.attributeValue("type"))){
                    Map map = xml2Map(nodeElement.asXML());
                    list.add(map); 
                    map = null; 
                }else{
                    list.add(nodeElement.getText());
                }
            } 
            nodes = null; 
            nodesElement = null; 
            document = null; 
            return list; 
        } catch (Exception e) { 
            e.printStackTrace(); 
        } 
        return null; 
    }
5.XML2MAP
     /**
     * xml 2 map
     * @param xml
     * @return
     */ 
    public Map xml2Map(String xml) { 
        try { 
            Map map = new HashMap(); 
            Document document = DocumentHelper.parseText(xml); 
            Element nodeElement = document.getRootElement(); 
            List node = nodeElement.elements(); 
            for (Iterator it = node.iterator(); it.hasNext();) {
                Element elm = (Element) it.next();
                if("l".equals(elm.attributeValue("type"))){
                    map.put(elm.getName(), xml2List(elm.asXML())); 
                }else if("o".equals(elm.attributeValue("type"))){
                    map.put(elm.getName(), xml2Map(elm.asXML())); 
                }else{
                    map.put(elm.getName(), elm.getText()); 
                }
                elm = null; 
            } 
            node = null; 
            nodeElement = null; 
            document = null; 
            return map; 
        } catch (Exception e) { 
            e.printStackTrace(); 
        } 
        return null; 
    }

评论

2 楼 josunmarks 2014-07-31  

没有  对其他语音没有研究

1 楼 windvix 2014-07-31  

有其它语言的版本不？