java 以dom方式解析xml

超、凢脫俗 2022-08-09 00:46 191阅读 0赞

【DOM(Document Object Model) 】

由W3C提供的接口，它将整个XML文档读入内存，构建一个DOM树来对各个节点(Node)进行操作。

下面是具体的代码实现：

/**
    	 * 解析发送短信返回的XML信息
    	 * 
    	 * @param returnMsg - xml格式
    	 * @return
    	 */
    	private List<SMSReturnResultMsg> parseSendReturnXml(String xmlMsg) throws Exception{
    		SMSReturnResultMsg smsReturnMsgDto = null;
    		List<SMSReturnResultMsg> resultList = new ArrayList<SMSReturnResultMsg>();
    		
    		try{
    			InputStream is = new ByteArrayInputStream(xmlMsg.getBytes("UTF-8"));
    
    			DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
    			DocumentBuilder docBuilder = factory.newDocumentBuilder();
    
    			Document doc = docBuilder.parse(is);
    			Element root = doc.getDocumentElement();
    			//获取属性指定属性值
    			String name = root.getAttribute("name");
    			String resultMsg = SMSUtils.getSMSReturnStatusMsg(Integer.valueOf(root.getAttribute("result")));
    			//获取子元素
    			NodeList  childNode = root.getChildNodes();
    			if(childNode != null && childNode.getLength() > 0){//子元素存在
    				for(int i = 0; i < childNode.getLength(); i ++){
    					smsReturnMsgDto = new SMSReturnResultMsg();		
    					smsReturnMsgDto.setActionName(name);//actionName
    					smsReturnMsgDto.setReturnStatus(resultMsg);//returnStatus
    					smsReturnMsgDto.setCid(childNode.item(i).getAttributes().getNamedItem("cid").getNodeValue());//cid
    					smsReturnMsgDto.setSid(childNode.item(i).getAttributes().getNamedItem("sid").getNodeValue());//sid
    					smsReturnMsgDto.setMsgid(childNode.item(i).getAttributes().getNamedItem("msgid").getNodeValue());//msgid
    					smsReturnMsgDto.setSmsTotal(childNode.item(i).getAttributes().getNamedItem("total").getNodeValue());//smsTotal
    					smsReturnMsgDto.setUnitPrice(childNode.item(i).getAttributes().getNamedItem("price").getNodeValue());//unitFee
    					smsReturnMsgDto.setCurrentRemain(childNode.item(i).getAttributes().getNamedItem("remain").getNodeValue());//currentRemain
    					
    					resultList.add(smsReturnMsgDto);
    				}
    			}else{//子元素不存在将根元素返回
    				smsReturnMsgDto = new SMSReturnResultMsg();			
    				smsReturnMsgDto.setActionName(name);//actionName
    				smsReturnMsgDto.setReturnStatus(resultMsg);//returnStatus
    				
    				resultList.add(smsReturnMsgDto);
    			}
    		}catch(Exception e){
    			logger.error("Exception happened in SMSServiceImpl.parseSendReturnXml(), the xmlMsg: "+ xmlMsg +"; the error msg is " + e.getMessage());
    			throw e;
    		}
    		
    		return resultList;
    	}