java - 使用 node.getTextContent() 从 xml 获取值时无法删除空格

Question

我有使用 DOM 解析器解析的 xml 配置文件。当我使用 node.getTextContent(); 从子节点获取值时，我无法删除字符串 value 中的空格。当我给出没有空格的值时，它会起作用。但是，我也必须处理负面场景。

我尝试了trim()、replaceAll("\s", "") 和replaceAll("\u00A0", "")；但没有任何效果

 NodeList serviceAddrNodeList=serviceAddressesNode.getChildNodes();

 packetSendingIplist =new ArrayList();

 for (int l = 0; l < serviceAddrNodeList.getLength(); l++) {

   Node serviceAddrNode=serviceAddrNodeList.item(l);

   if(serviceAddrNode.getNodeType()==Node.ELEMENT_NODE){                                                                        

    String packetSendingIp = serviceAddrNode.getTextContent();                                                  
    packetSendingIp.trim(); //replaceAll("\s", "") and replaceAll("\u00A0", "")                      
    if(checkValidIp(packetSendingIp)){

      log("invalid service_addr-"+packetSendingIp+"ignoring this 
      listening point ");   
   }
 }                                                   
}

xml:

  <service_addresses>
  <!-- host1 -->
  <service_addr>172.17.1.16 </service_addr>
  <service_addr>172.17.1.17 </service_addr>
  <!-- host12-->
  <service_addr>172.17.1.32</service_addr>//works becuase no space here
  <service_addr>172.17.1.33 </service_addr>    
</service_addresses>

Answer 1

试试这个

File fXmlFile = new File("your xml file path");
DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
Document doc = dBuilder.parse(fXmlFile);
NodeList nodeList = doc.getElementsByTagName("service_addr");
   for(int i = 0; i < nodeList.getLength(); i++) {
      System.out.println(nodeList.item(i).getTextContent().trim());
   }

输出，没有任何空格

172.17.1.16
172.17.1.17
172.17.1.32
172.17.1.33