以下是我的XML文件示例：
?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="xslt/options.xsl"?>
<options>
<version>0001</version>
<title>ConfigData</title>
<category>
<name>GConfigData</name>
<option>
<name>String_name</name>
<value>350.16.01a</value>
<control>
<type>TextBox2</type>
<caption> String Name</caption>
<left>0</left>
<top>0</top>
<width>2600</width>
<height>900</height>
<font>Courier</font>
<scroll_bar>0</scroll_bar>
</control>
</option>
<option>
<name>FileID</name>
<value>1601</value>
<control>
<type>TextBox2</type>
<caption>file version</caption>
<left>0</left>
<top>900</top>
<width>2600</width>
<height>900</height>
<font>Courier</font>
<scroll_bar>0</scroll_bar>
</control>
</option>
<option>
<name>systemID</name>
<value>0</value>
<control>
<type>TextBox2</type>
<caption>System ID</caption>
<left>0</left>
<top>1800</top>
<width>2400</width>
<height>900</height>
<font>Courier</font>
<scroll_bar>0</scroll_bar>
</control>
</option>
<option>
<name>SyncTime</name>
<value>2</value>
<control>
<type>TextBox2</type>
<caption>Sync Time</caption>
<left>0</left>
<top>2700</top>
<width>2400</width>
<height>900</height>
<font>Courier</font>
<scroll_bar>0</scroll_bar>
</control>
</option>
<option>
<name>UseServer</name>
<value>0</value>
<control>
<type>TextBox2</type>
<caption>Use Server</caption>
<left>0</left>
<top>3600</top>
<width>2400</width>
<height>900</height>
<font>Courier</font>
<scroll_bar>0</scroll_bar>
</control>
</option>
<option>
<name>CommType</name>
<value>0</value>
<control>
<type>FixedList</type>
<caption>Comm Type</caption>
<left>0</left>
<top>4500</top>
<width>2400</width>
<height>900</height>
<list>
<item>
<text>Parellel</text>
<value>0</value>
</item>
<item>
<text>Simple Serial</text>
<value>1</value>
</item>
<item>
<text>Complex Serial</text>
<value>2</value>
</item>
</list>
</control>
</option>
<option>
<name>YYBasis</name>
<value>70</value>
<control>
<type>TextBox2</type>
<caption>Set YY Basis</caption>
<left>0</left>
<top>5400</top>
<width>2400</width>
<height>900</height>
<font>Courier</font>
<scroll_bar>0</scroll_bar>
</control>
</option>
<option>
<name>Separator</name>
<value>46</value>
<control>
<type>TextBox2</type>
<caption>Separator</caption>
<left>0</left>
<top>6300</top>
<width>2400</width>
<height>900</height>
<font>Courier</font>
<scroll_bar>0</scroll_bar>
</control>
</option>
<option>
<name>WholeSeparator</name>
<value>44</value>
<control>
<type>TextBox2</type>
<caption>Whole Separator</caption>
<left>0</left>
<top>7200</top>
<width>2400</width>
<height>900</height>
<font>Courier</font>
<scroll_bar>0</scroll_bar>
</control>
</option>
<option>
<name>DateFormat</name>
<value>0</value>
<control>
<type>FixedList</type>
<caption>Date Format</caption>
<left>2600</left>
<top>0</top>
<width>2400</width>
<height>900</height>
<list>
<item>
<text>MM/DD/YY</text>
<value>0</value>
</item>
<item>
<text>MM/DD/YYYY</text>
<value>1</value>
</item>
<item>
<text>DD/MM/YY</text>
<value>2</value>
</item>
<item>
<text>DD/MM/YYYY</text>
<value>3</value>
</item>
<item>
<text>YY/MM/DD</text>
<value>4</value>
</item>
<item>
<text>MM.DD.YY</text>
<value>6</value>
</item>
<item>
<text>MM.DD.YYYY</text>
<value>7</value>
</item>
<item>
<text>DD.MM.YY</text>
<value>8</value>
</item>
<item>
<text>DD.MM.YYYY</text>
<value>9</value>
</item>
<item>
<text>YY.MM.DD</text>
<value>10</value>
</item>
<item>
<text>YYYY.MM.DD</text>
<value>11</value>
</item>
</list>
</control>
</option>
</category>
</options>
我编写了java代码来解析每个选项的名称，标题和值。这是代码：
public class XMLParsingSingleFileFinal {
public static void main(String[] args) throws ParserConfigurationException, SAXException, IOException
{
//Get Document Builder
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = factory.newDocumentBuilder();
//Build Document
Document document = builder.parse(new File("options.xml"));
//Normalize the XML Structure; It's just too important !!
document.getDocumentElement().normalize();
XPath xPath = XPathFactory.newInstance().newXPath();
//Here comes the root node
Element root = document.getDocumentElement();
System.out.println(root.getNodeName());
//Get all options
NodeList nList = document.getElementsByTagName("options");
System.out.println("Total Options = " + nList.getLength());
System.out.println("TITLE = " + document.getElementsByTagName("title").item(0).getTextContent());
System.out.println("VERSION = " + document.getElementsByTagName("version").item(0).getTextContent());
System.out.println("===================================");
//Get all category
NodeList nList1 = document.getElementsByTagName("category");
System.out.println("Total Category inside options = " + nList1.getLength());
//int count1 = nList1.getLength();
for (int temp = 0; temp < nList1.getLength(); temp++)
{
Node node = nList1.item(temp);
if (node.getNodeType() == Node.ELEMENT_NODE)
{
Element mElement = (Element) node;
System.out.println("\nCategory Name = " + mElement.getElementsByTagName("name").item(0).getTextContent());
NodeList nList2 = mElement.getElementsByTagName("option");
System.out.println("option inside category = " + nList2.getLength());
System.out.println("\n\t");
// int count = nList2.getLength();
for (int temp1 = 0; temp1 < nList2.getLength()/2; temp1++)
{
Node nNode = nList2.item(temp1);
if (nNode.getNodeType() == Node.ELEMENT_NODE)
{
Element nElement = (Element) nNode;
System.out.println("\tOption Name = " + mElement.getElementsByTagName("name").item(temp1+1).getTextContent());
System.out.println("\t\tCaption Name = " + mElement.getElementsByTagName("caption").item(temp1).getTextContent());
System.out.println("\t\tValue = " + mElement.getElementsByTagName("value").item(temp1).getTextContent());
System.out.println("\n\t");
}
}
System.out.println("\n\t");
}
}
}
}
我的主要目的是解析节点“选项”的“值”。
正如您在“选项” - commtype中所看到的那样，属性“item”也具有childnode“value”。
因此，在解析时，直到选项名称“commtype”，它正在生成正确的数据。转到下一个选项，它从前一个选项中获取childnode“item”的“值”。
Example:(Parse Result)
options
Total Options = 1
TITLE = ConfigData
VERSION = 0001
===================================
Total Category inside options = 23
Category Name = GConfigData
option inside category = 38
Option Name = String_name
Caption Name = String Name
Value = 350.16.01a
Option Name = FileID
Caption Name = file version
Value = 1601
Option Name = SystemID
Caption Name = System ID
Value = 0
Option Name = SyncTime
Caption Name = Sync Time
Value = 2
Option Name = UseServer
Caption Name = Use Server
Value = 0
Option Name = CommType
Caption Name = Comm Type
Value = 0
Option Name = YYBasis
Caption Name = Set YY Basis
Value = 0 /*(Here the value should be 70 as in XML file , But its taking the value of option(Name:CommType)/control/list/item(text:parellel)/value )*/
Option Name = Separator
Caption Name = Separator
Value = 1 /*(Here the value should be 46 as in XML file , But its taking the value of option(Name:CommType)/control/list/item(text:simple serial)/value)*/
Option Name =WholeSeparator
Caption Name = Whole Separator
Value = 2 /*(Here the value should be 44 as in XML file , But its taking the value of option(Name:CommType)/control/list/item(text:complex serial)/value)*/
Option Name = DateFormat
Caption Name = Date Format
Value = 70 //(Value should be 0)
在选项名称：CommType之后，每个选项的值都被错误地解析。
这有什么解决方案？我是java和XML的新手。
PS：这是我在这个论坛上的第一个问题。我对任何拼写错误以及质疑方式是否错误表示道歉。请尝试以可能的方式帮助我。
答案 0 :(得分：1)
不要对节点使用索引\偏移量（硬编码反模式），这会使你的代码不敏捷
SAXReader reader = new SAXReader();
Document document = reader.read(file);
List<Node> nodes = document.selectNodes("/options/category/option");
for (Node node : nodes) {
System.out.println("caption: " + node.selectSingleNode("control/caption").getText());
System.out.println("value : " + node.selectSingleNode("value").getText());
}
示例输出（cutted）：
caption: String Name
value : 350.16.01a
caption: file version
value : 1601
caption: System ID
value : 0
所需的依赖项：
<dependency>
<groupId>jaxen</groupId>
<artifactId>jaxen</artifactId>
<version>1.1.6</version>
</dependency>
<dependency>
<groupId>dom4j</groupId>
<artifactId>dom4j</artifactId>
<version>1.6.1</version>
</dependency>
答案 1 :(得分：1)
方法node.getElementsByTagName ()搜索node内的所有事件。由于您始终使用“类别”节点作为搜索库而不是选项或项目节点，因此您将获得意外结果。