当使用 node.getTextContent() 从 xml 获取值时,我无法删除 space

I can't remove space when get value from xml using node.getTextContent()

我有 xml 我们使用 DOM 解析的配置文件 parser.when 我使用 node.getTextContent() 从子节点获取值;,我无法删除 space 在字符串 value.it 中工作,当我在没有 space 的情况下给出值时。但是,我也必须处理负面的场景。

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

 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>

您可以通过正则表达式删除内容开头和结尾的所有空格:

public class Main {

    public static final String DEST = "html_1.pdf";
    private static final String WHITESPACE_REGEX = "(^( )*|( )*$)";

    public static void main(String[] args) throws Exception {
        Assert.assertEquals(" 192.168.1.1 ".replaceAll(WHITESPACE_REGEX, StringUtils.EMPTY), "192.168.1.1");
        Assert.assertEquals("     192.168.1.1 ".replaceAll(WHITESPACE_REGEX, StringUtils.EMPTY), "192.168.1.1");
        Assert.assertEquals("192.168.1.1         ".replaceAll(WHITESPACE_REGEX, StringUtils.EMPTY), "192.168.1.1");
        Assert.assertEquals("192.168.1.1".replaceAll(WHITESPACE_REGEX, StringUtils.EMPTY), "192.168.1.1");
    }
}

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

你不能那样做 Trim()。您必须再次将此输出分配给变量,因为在您执行此操作之后,它仍然具有相同的值。将 trim 添加到此行,它应该会按预期工作。

String packetSendingIp = serviceAddrNode.getTextContent().trim()