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由于 xml 文件中的空格，我面临一个问题。我想从 xml 读取数据，但由于节点之间的空间，我面临各种问题。

前任。

If a node has 4 childs, due to the spaces it shows 9 childs to the node. So when I try to display node values in table, some columns without heading and without data are also created.

When I removed these spaces I read my file successfully without any problem.

那么如何解决这样的问题呢？因为每次我都无法亲自从文件中删除空格，因为我读取了多个 xml 文件。因此，从每个文件中删除空格将是一项繁琐的工作。

Document doc;
DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
doc = dBuilder.parse(fp);
doc.getDocumentElement().normalize();            
NodeList nList = doc.getElementsByTagName("parameter"); 
nodeName = name; 
for (int temp = 0; temp < nList.getLength();temp++)
{
     Node nNode =  (Node) nList.item(temp);
     Element eElement = (Element) nNode;
     String upname1 = getTagValue("name", eElement);
     System.out.println(nodeName+"   UP:    "+upname1);

     if(upname1.equals(nodeName))
     {  
           NodeList pvalList = eElement.getElementsByTagName("paramvalues");
           for(int l=0; l< pvalList.getLength(); l++)
           {
                 Node pNode = (Node) pvalList.item(l);
                 NodeList valList = pNode.getChildNodes();

                 for(int j=0; j<valList.getLength(); j++)
                 {
                     Node valNode = (Node) valList.item(j);

                     if(valNode.getNodeName().equals("value"))
                     {
                          NamedNodeMap att = valNode.getAttributes();

                          for(int s=0; s<att.getLength(); s++)
                          {
                              Node n1 = att.item(s);
                              System.out.println("len:   "+att.getLength());
                              if(n1.getNodeName().equals("default"))
                                   def = n1.getNodeValue();

                              if(n1.getNodeName().equals("actualvalue"))
                                   aval = n1.getNodeValue();
                           }
                      }
                 }
           }
     }
}

我知道这是一个奇怪的问题，但是在完成我的工作时它变得很烦人。

请帮助..谢谢..

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1 回答 1

0

您可以尝试从字符串的左侧和右侧创建一个 TRIM 空格的类，同时解析示例' John Smith '的文档变为'John Smith' | 来源：http ://rosettacode.org/wiki/Strip_whitespace_from_a_string/Top_and_tail

 public class Trims{
   public static String ltrim(String s){
      int i = 0;
      while (i < s.length() && Character.isWhitespace(s.charAt(i))){
         i++;
      }
      return s.substring(i);
   }

   public static String rtrim(String s){
      int i = s.length() - 1;
      while (i > 0 && Character.isWhitespace(s.charAt(i))){
         i--;
      }
      return s.substring(0, i + 1);
   }

   public static void main(String[] args){
      String s = " \t \r \n String with spaces  \t  \r  \n  ";
      System.out.println(ltrim(s));
      System.out.println(rtrim(s));
      System.out.println(s.trim()); //trims both ends
   }

或找到一种不同的方式来处理内容..利用 DOMBuilder ( http://www.java-tips.org/other-api-tips/jdom/dealing-with-mixed-content-whitespace-comments-text -child-elements-and.html )

        // a builder takes a boolean value meaning validation mode:
        DOMBuilder builder = new DOMBuilder(false);

        // simply load the document::
        Document document = builder.build(
                new java.io.File("sample.xml"));

        Element order = document.getRootElement();

        // find an address tag:
        Element address = 
                order.getChild("purchased-by").getChild("address");
于 2012-04-04T09:53:43.373 回答