我有一个包含许多<dict>元素的xml文件，我想尝试获取第三个元素中的元素。我的问题是，当我调用doc.getElementsByTagName（“dict”）时，它会获取所有被称为dict的元素。
以下是代码：
try {
File inputFile = new File("itunes2.xml");
DocumentBuilderFactory dbFactory = DocumentBuilderFactory
.newInstance();
DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
Document doc = dBuilder.parse(inputFile);
doc.getDocumentElement().normalize();
System.out.println("Root element :"
+ doc.getDocumentElement().getNodeName());
NodeList nList = doc.getElementsByTagName("dict");
System.out.println("----------------------------");
for (int temp = 0; temp < nList.getLength(); temp++) {
Node nNode = nList.item(temp);
System.out.println("\nCurrent Element :" + nNode.getNodeName());
if (nNode.getNodeType() == Node.ELEMENT_NODE) {
Element eElement = (Element) nNode;
System.out.println("Major Version : "
+ eElement.getElementsByTagName("integer").item(0)
.getTextContent());
System.out.println("Minor Version : "
+ eElement.getElementsByTagName("integer").item(0)
.getTextContent());
System.out.println("Application version : "
+ eElement.getElementsByTagName("string").item(0)
.getTextContent());
System.out.println("Features : "
+ eElement.getElementsByTagName("integer").item(2)
.getTextContent());
System.out.println("Music Folder : "
+ eElement.getElementsByTagName("string").item(1)
.getTextContent());
System.out.println("Library Persistent ID : "
+ eElement.getElementsByTagName("string").item(2)
.getTextContent());
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
XML：
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>Major Version</key><integer>1</integer>
<key>Minor Version</key><integer>1</integer>
<key>Application Version</key><string>10.1</string>
<key>Features</key><integer>5</integer>
<key>Show Content Ratings</key><true/>
<key>Music Folder</key><string>file://localhost//Thomts/Holly/data/My%20Music/iTunes/iTunes%20Music/</string>
<key>Library Persistent ID</key><string>29E12A03204E0721</string>
<key>Tracks</key>
<dict>
<key>324</key>
<dict>
<key>Track ID</key><integer>324</integer>
<key>Name</key><string>Talk Dirty To Me</string>
<key>Artist</key><string>Poison</string>
<key>Composer</key><string>Poison</string>
<key>Album</key><string>The Best Of Poison: 20 Years Of Rock</string>
<key>Genre</key><string>Metal</string>
<key>Kind</key><string>AAC audio file</string>
<key>Size</key><integer>3698203</integer>
<key>Total Time</key><integer>224866</integer>
<key>Disc Number</key><integer>1</integer>
<key>Disc Count</key><integer>1</integer>
<key>Track Number</key><integer>1</integer>
<key>Track Count</key><integer>18</integer>
<key>Year</key><integer>1986</integer>
<key>Date Modified</key><date>2008-08-07T15:16:57Z</date>
<key>Date Added</key><date>2008-08-07T15:17:17Z</date>
<key>Bit Rate</key><integer>128</integer>
<key>Sample Rate</key><integer>44100</integer>
<key>Play Count</key><integer>6</integer>
<key>Play Date</key><integer>3378486192</integer>
<key>Play Date UTC</key><date>2011-01-22T03:23:12Z</date>
<key>Compilation</key><true/>
<key>Sort Album</key><string>Best Of Poison: 20 Years Of Rock</string>
<key>Persistent ID</key><string>29E12A03204E0873</string>
<key>Track Type</key><string>File</string>
<key>Location</key><string>file://localhost//Thomts/Holly/data/My%20Music/iTunes/iTunes%20Music/Compilations/The%20Best%20Of%20Poison_%2020%20Years%20Of%20Rock/01%20Talk%20Dirty%20To%20Me.m4a</string>
<key>File Folder Count</key><integer>4</integer>
<key>Library Folder Count</key><integer>1</integer>
</dict>
它输出：
Root element :plist
Current Element :dict
Major Version : 1
Minor Version : 1
Application version : 10.1
Features : 5
Music Folder : file://localhost//Thomts/Holly/data/My%20Music/iTunes/iTunes%20Music/
Library Persistent ID : 29E12A03204E0721
Current Element :dict
Major Version : 324
Minor Version : 324
Application version : Talk Dirty To Me
Features : 224866
Music Folder : Poison
Library Persistent ID : Poison
正如您所看到的，它获取了第一个元素的正确信息，然后是第二个元素的错误信息。我想知道如何在第三个dict标签中获取所有信息，以便我可以获得歌曲的所有信息，例如曲目ID，姓名，艺术家等..
答案 0 :(得分：0)
你不能提取好的信息，首先是因为它们之间没有联系：
例如：主要版本1
检索：整数，而不是按键
您必须测试密钥的第一个内容，然后采用下一个项目（整数）。
否则，如果可以选择xml文件的格式，
你应该通过密钥检索，并将1放在这个标签内，就像那样
＆LT;键名=＆＃34;主要版本＆＃34;＆gt;＆lt;整数＆GT; 1＆lt; / integer＆gt;＆lt; /键＆GT;
或只是＆lt;键名=＆＃34;主要版本＆＃34;＆gt; 1＆lt; /键＆GT;如果你不关心类型信息
或＆lt; Major_Version→1＆LT; / Major_Version＆GT; ：你可以通过
进行检索getElementsByTagName("Major_Version")
我重写了你的代码：
你也应该对专辑的dict和歌曲的dict（不同的键可用）有所区别。
NodeList nList = document.getElementsByTagName("dict");
System.out.println("----------------------------");
for (int temp = 0; temp < nList.getLength(); temp++)
{
Node nNode = nList.item(temp);
if (nNode.getNodeType() == Node.ELEMENT_NODE)
{
Element eElement = (Element) nNode;
System.out.println("NODE NAME:"+eElement.getNodeName());
System.out.println("TAG NAME:"+eElement.getTagName());
// Iterate through sub-elements
// A map to store key => values
Map<String,String> mss=new HashMap<String,String>();
NodeList childs = eElement.getChildNodes();
{
for (int k = 0; k < childs.getLength(); k++)
{
Node child = childs.item(k);
if (child.getNodeType() == Node.ELEMENT_NODE)
{
Element child_element = (Element) child;
String tag=child_element.getTagName();
String content=child_element.getTextContent();
if (tag.equals("key") && (k+1< childs.getLength()))
{
// Next one
Node next = childs.item(k+1);
if (next.getNodeType() == Node.ELEMENT_NODE)
{
Element next_element = (Element) next;
// Should be integer or string
String next_tag=next_element.getTagName();
String next_content=next_element.getTextContent();
// store
mss.put(content, next_content);
// skip
k++;
}
}
}
}
}
// SEE THE MAP
System.out.println("ALL ELEMENTS:"+mss);
// Get what you want
String major_version="";
String minor_version="";
String application_version="";
String music_folder="";
String track_id="";
String name="";
String artist="";
if (mss.containsKey("Major Version")) major_version=mss.get("Major Version");
if (mss.containsKey("Minor Version")) minor_version=mss.get("Minor Version");
if (mss.containsKey("Application Version")) application_version=mss.get("Application Version");
if (mss.containsKey("Music Folder")) music_folder=mss.get("Music Folder");
if (mss.containsKey("Track ID")) track_id=mss.get("Track ID");
if (mss.containsKey("Name")) name=mss.get("Name");
if (mss.containsKey("Artist")) artist=mss.get("Artist");
// SHOW
System.out.println("Major Version : "+major_version);
System.out.println("Minor Version : "+minor_version);
System.out.println("Application version : "+application_version);
System.out.println("Music Folder : "+music_folder);
System.out.println("Track ID : "+track_id);
System.out.println("Name : "+name);
System.out.println("Artist : "+artist);
}
}
我希望它可以帮到你