Question

我是非常新的编码，任何人都可以帮我纠正我的代码。我需要读取XML数据并将数据存储在文本文件中。每个值必须用逗号分隔，一旦读取了一条记录的数据，就需要转到下一行并执行另一条记录。

示例XML文件：

<?xml version="1.0" encoding="UTF-8"?>
 <xml_tool xmlns:md="http://www.example.com/XT/1.0/">  
    <md:header>       
          <md:application_version>1.0</md:application_version>      
         <md:export_date>19-04-2012</md:export_date>   
          <md:export_time>14:55</md:export_time>   
          <md:export_user>USER01</md:export_user> 
    </md:header>   
    <md:table table_name="CUSTOMER" key="customer number" record_count="2" column_count="5">  
          <md:record>   
                                        <md:column name="customer_number">123456</md:column>   
                                         <md:column name="reg_date">01-04-2012</md:column>   
                                          <md:column name="customer_name">Test Customer</md:column>  
                                          <md:column name="customer_type">Normal </md:column> 
                                          <md:column name="comments">This is a test record</md:column>       
            </md:record>     
             <md:record>             
                                           <md:column name="customer_number">555111</md:column>   
                                            <md:column name="reg_date">02-04-2012</md:column>        
                                            <md:column name="customer_name">Test Customer</md:column>     
                                            <md:column name="customer_type"> </md:column>            
                                             <md:column name="comments">This is a test record</md:column>         
                </md:record>     
      </md:table>
</xml_tool

我的代码：

import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.DocumentBuilder;
import org.w3c.dom.Document;
import org.w3c.dom.NodeList;
import org.w3c.dom.Node;
import org.w3c.dom.Element;
import java.io.*;

public class ParseXML {

    public static void main(String argv[])throws IOException {

         try {     
             BufferedWriter writer = new BufferedWriter(new FileWriter("results/staff.txt")); 
             File fXmlFile = new File("data/hardware-info.xml");  

             DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();  
             DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();      
             Document doc = dBuilder.parse(fXmlFile);      
             doc.getDocumentElement().normalize();    
             NodeList nList = doc.getElementsByTagName("md:record");     
             for (int i = 0; i < nList.getLength(); i++) 
             {      
                 Node node = nList.item(i);    
                 if (node.getNodeType() == Node.ELEMENT_NODE)    
                 {         
                      Element eElement = (Element) node; 
                     if(eElement.hasChildNodes())    
                     {               
                         NodeList nl = node.getChildNodes();      
                         for(int j=0; j<nl.getLength(); j++)  
                         {                   
                             Node nd = nl.item(j);   
                             String name= nd.getTextContent();
                                f (name != null && !name.trim().equals(""))                                 {
                                    System.out.print(name.trim()+",");   
                                    //System.out.print(" ");
                                    writer.write(nd.getTextContent().trim() + " ");
                                }

                         } 
                         System.out.println("");
                         writer.write("\n");
                         }        
                         } }  
             writer.close();
             } 
         catch (Exception e) {       
                         e.printStackTrace();     } } 
    @SuppressWarnings("unused")
    private static String getTagValue(String sTag, Element eElement)
    {        
        NodeList nlList = eElement.getElementsByTagName(sTag).item(0).getChildNodes();  
        Node nValue = (Node) nlList.item(0);       
        return nValue.getNodeValue();     
        } 
}

此代码的输出：

123456,01-04-2012,Test Customer,Normal,,This is a test record,
555111,02-04-2012,Test Customer,This is a test record,

预期产出：

123456,01-04-2012,Test Customer,Normal,This is a test record
555111,02-04-2012,Test Customer, ,This is a test record

Answer 1

我怀疑这是你的问题：

String name = nd.getTextContent();
if (name != null)

您可能希望：

String name = nd.getTextContent();
if (name != null && name.length() > 0)

Answer 2

将if (name != null)更改为

if (name != null && !name.trim().equals(""))

将XML数据读入文本文件

2 个答案: