JAVA - 解析 XML 文件未正确存储数据

Question

我正在解析一个 XML 文件很好，除了它不保存找到的第一个数据而只保存第二个（最后一个）

这是文件：

 package main; import java.io.File; import java.util.ArrayList; import javax.xml.parsers.DocumentBuilder; import javax.xml.parsers.DocumentBuilderFactory; import org.w3c.dom.Document; import org.w3c.dom.Element; import org.w3c.dom.Node; import org.w3c.dom.NodeList; import main.advertise.Advert; import main.advertise.guilds.Guild; import main.advertise.server.Server; public class Servers { //private Server[] servers; //private Guild[] guilds; private ArrayList<Server> servers = new ArrayList<Server>(); private ArrayList<Guild> guilds = new ArrayList<Guild>(); @SuppressWarnings("null") public void init() { Server server = new Server("", "", "", "", new String[] {}, new String[] {}, 0, 0, 0); Guild guild = new Guild("", "", "", "", new String[] {}, 0); try { File fXmlFile = new File("C:/Users/NULL/Desktop/Adverts.xml"); DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance(); DocumentBuilder dBuilder = dbFactory.newDocumentBuilder(); Document doc = dBuilder.parse(fXmlFile); doc.getDocumentElement().normalize(); NodeList nList = doc.getElementsByTagName("advertisement"); 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("Server Name - " + eElement.getElementsByTagName("servername").item(0).getTextContent()); server.setServerName(eElement.getElementsByTagName("servername").item(0).getTextContent()); server.setDiscordLink(eElement.getElementsByTagName("discordlink").item(0).getTextContent()); server.setOwnerId(eElement.getElementsByTagName("ownerid").item(0).getTextContent()); server.setLogoUrl(eElement.getElementsByTagName("logourl").item(0).getTextContent()); NodeList features = doc.getElementsByTagName("feature"); String[] featureList = new String[features.getLength()]; for (int i = 0; i < features.getLength(); i++) { Node node = features.item(i); featureList[i]=features.item(i).getTextContent(); System.out.println(features.item(i).getTextContent() + " - new"); } server.setServerFeatures(featureList); NodeList images = doc.getElementsByTagName("image"); String[] namesArray = new String[images.getLength()]; for (int i = 0; i < images.getLength(); i++) { Node node = images.item(i); namesArray[i]=images.item(i).getTextContent(); System.out.println(images.item(i).getTextContent() + " - new"); } server.setServerImages(namesArray); guild.setGuildId(eElement.getElementsByTagName("id").item(0).getTextContent()); guild.setGuildName(eElement.getElementsByTagName("guildname").item(0).getTextContent()); System.out.println(eElement.getElementsByTagName("guildname").item(0).getTextContent()); guild.setAdvertiseChannel(eElement.getElementsByTagName("advertchannel").item(0).getTextContent()); guild.setCommandChannel(eElement.getElementsByTagName("commandchannel").item(0).getTextContent()); NodeList users = doc.getElementsByTagName("user"); String[] namessArray = new String[users.getLength()]; for (int i = 0; i < users.getLength(); i++) { Node node = users.item(i); namessArray[i]=users.item(i).getTextContent(); System.out.println(users.item(i).getTextContent() + " - new users"); } guild.setAuthorisedUsers(namessArray); guild.setAdvertisementDelay(Integer.parseInt(eElement.getElementsByTagName("delay").item(0).getTextContent())); //guilds[tempp] = guild; guilds.add(guild); servers.add(server); Advert advert = new Advert(guild, server); Main.servers.add(advert); } } } catch (Exception e) { e.printStackTrace(); } System.out.println("Size: ----------------- " + servers.size()); for(int i = 0; i < servers.size(); i++) { if(guilds.get(i) == null) return; Advert v = new Advert(guilds.get(i), servers.get(i), servers.get(i).getServerName()); if(!Main.servers.contains(v)) { //Main.servers.add(new Advert(guilds.get(i), servers.get(i), servers.get(i).getServerName())); } } System.out.println(" "+Main.servers.get(0).getServer().getServerName()); System.out.println(" "+Main.servers.get(0).getGuild().getGuildName()); System.out.println(" "+Main.servers.get(1).getServer().getServerName()); System.out.println(" "+Main.servers.get(1).getGuild().getGuildName()); } }

这是 XML 文件：

 <advertisements> <advertisement> <server> <servername>Zenith</servername> <discordlink>http://zenithps.org</discordlink> <ownerid>304558905306906624</ownerid> <logourl>http://zenithps.org/Zenith%20Logo.png</logourl> <feature>Feature1</feature> <feature>Feature2</feature> <image>C:/Users/NULL/Pictures/Zenith Logo.png</image> <image>C:/Users/NULL/Pictures/Description Hovers.gif</image> <image>C:/Users/NULL/Pictures/Launcher.png</image> <image>C:/Users/NULL/Pictures/Upgrade.gif</image> <image>C:/Users/NULL/Pictures/Pet.png</image> </server> <guild> <id>642406906580828181</id> <guildname>Guild</guildname> <advertchannel>658936539803418624</advertchannel> <commandchannel>658936539803418624</commandchannel> <user>304558905306906624</user> <delay>25000</delay> </guild> </advertisement> <advertisement> <server> <servername>Test Server</servername> <discordlink>http://zenithps.org</discordlink> <ownerid>304558905306906624</ownerid> <logourl>http://zenithps.org/Zenith%20Logo.png</logourl> <feature>Feature1</feature> <feature>Feature2</feature> <image>C:/Users/NULL/Pictures/Zenith Logo.png</image> <image>C:/Users/NULL/Pictures/Description Hovers.gif</image> <image>C:/Users/NULL/Pictures/Launcher.png</image> <image>C:/Users/NULL/Pictures/Upgrade.gif</image> <image>C:/Users/NULL/Pictures/Pet.png</image> </server> <guild> <id>6424069110828181</id> <guildname>Test Guild</guildname> <advertchannel>658936539803418624</advertchannel> <commandchannel>658936539803418624</commandchannel> <user>304558905306906624</user> <delay>25000</delay> </guild> </advertisement> </advertisements>

打印时

System.out.println("    "+Main.servers.get(0).getServer().getServerName());
System.out.println("    "+Main.servers.get(0).getGuild().getGuildName());
System.out.println("    "+Main.servers.get(1).getServer().getServerName());
System.out.println("    "+Main.servers.get(1).getGuild().getGuildName());

我收到响应测试服务器测试公会测试服务器测试公会

不过这应该是 Zenith Guild Test Server Test Guild

它在使用以下方法解析文件的同时打印 Zenith 和 Guild：

System.out.println("Server Name - " + eElement.getElementsByTagName("servername").item(0).getTextContent());

System.out.println(eElement.getElementsByTagName("guildname").item(0).getTextContent());

但它没有正确存储它。 我试过移动东西，但似乎无法正确处理。

Answer 1

这里 Main.servers.get(0) 和 Main.servers.get(1) 都指向同一个实例。 而不是创建一个new Server/Guild实例，对于每个服务器元素，只有一个实例被一次又一次地修改，因此Server/Guild将拥有最后一个元素的数据。 请在 for 循环内移动初始化，它应该可以正常工作。
请移动

Server server = new Server("", "", "", "", new String[] {}, new String[] {}, 0, 0, 0);
Guild guild = new Guild("", "", "", "", new String[] {}, 0);

里面

for (int temp = 0; temp < nList.getLength(); temp++) {