Question

我的回复是XML。我试图解析XML对象以获取内部细节。我正在使用DocumentBuilderFactory。父对象不为null，但是当我尝试获取deepnode列表元素时，它返回null。我错过了什么

这是我的回复XML

responseXML的

<DATAPACKET REQUEST-ID = "1">
<HEADER>        
</HEADER>
<BODY>      
    <CONSUMER_PROFILE2>
        <CONSUMER_DETAILS2>             
            <NAME>David</NAME>
            <DATE_OF_BIRTH>1949-01-01T00:00:00+03:00</DATE_OF_BIRTH>
            <GENDER>001</GENDER>
        </CONSUMER_DETAILS2>
      </CONSUMER_PROFILE2></BODY></DATAPACKET>

我正在以下列方式解析

DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder db = dbf.newDocumentBuilder();
InputSource is = new InputSource();
is.setCharacterStream(new StringReader(responseXML));
// Consumer details.

if(doc.getDocumentElement().getElementsByTagName("CONSUMER_DETAILS2") != null) {              
            Node consumerDetailsNode = doc.getDocumentElement().getElementsByTagName("CONSUMER_DETAILS2").item(0); -->This is coming as null                
            dateOfBirth = getNamedItem(consumerDetailsNode, "DATE_OF_BIRTH");                               
            System.out.println("DOB:"+dateOfBirth);             

        }

getNamedItem

private static String getNamedItem(Node searchResultNode, String param) {
    return searchResultNode.getAttributes().getNamedItem(param) != null ? searchResultNode.getAttributes().getNamedItem(param).getNodeValue() : "";
}

任何想法都将不胜感激。

Answer 1

在XML文档中搜索单个元素的最简单方法是使用XPAth。它提供类似于文件系统表示法的搜索语法。以下是您文档特定问题的解决方案：

采用

编辑解决方案来支持多个CONSUMER_PROFILE2元素。您只需要获取并解析一个NodeList

的Node instread

import java.io.*;
import javax.xml.parsers.*;
import javax.xml.xpath.*;
import org.w3c.dom.*;
import org.xml.sax.*;

public class XpathDemo
{
    public static void main(String[] args)
    {
        try {
            DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
            DocumentBuilder builder = factory.newDocumentBuilder();
            Document xmlDoc = builder.parse(new InputSource(new FileReader("C://Temp/xx.xml")));

            // Selects all CONSUMER_PROFILE2 elements no matter where they are in the document
            String cp2_nodes = "//CONSUMER_PROFILE2";
            // Selects first DATE_OF_BIRTH element somewhere under current element
            String dob_nodes = "//DATE_OF_BIRTH[1]";
            // Selects text child node of current element
            String text_node = "/child::text()";

            XPath xPath =  XPathFactory.newInstance().newXPath();
            NodeList dob_list = (NodeList)xPath.compile(cp2_nodes + dob_nodes + text_node)
                    .evaluate(xmlDoc, XPathConstants.NODESET);
            for (int i = 0; i < dob_list.getLength() ; i++) {
                Node dob_node = dob_list.item(i);
                String dob_text = dob_node.getNodeValue();
                System.out.println(dob_text);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

无法使用Java中的DocumentBuilderFactory解析XML的内部元素

responseXML的

getNamedItem

1 个答案: