如何在Java中将XML读入POJO列表？

我是XML新手，我试图读入XML页面并将其内容存储在arraylist中

到目前为止，我似乎已经能够用第一个内容填充arraylist，因为当我尝试isEmpty时，它返回false。所以肯定有一些东西。 然而，当我尝试调用overidedtostring方法，或者甚至尝试为此调用任何单个类别时，它只返回空

有人能帮忙吗

以下是我正在使用的代码：

package test;

import java.io.File;
import java.util.ArrayList;

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;

public class xmlmx {

   public static void main(String[] args) {
      ArrayList<Anime> list = new ArrayList<Anime>();
      try {
         File inputFile = new File("c:\\code\\ad\\XMLDB.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("Anime");
         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;
               list.add(new Anime(eElement.getAttribute("ID"),
                                  eElement.getAttribute("name"),
                                  eElement.getAttribute("altname"),
                                  eElement.getAttribute("seasons"),
                                  eElement.getAttribute("episodes"),
                                  eElement.getAttribute("status"),
                                  eElement.getAttribute("DS"),
                                  eElement.getAttribute("have"),
                                  eElement.getAttribute("left"),
                                  eElement.getAttribute("plot"),
                                  eElement.getAttribute("connect"),
                                  eElement.getAttribute("image")));
               System.out.println(list.get(0).toString());
            }
         }
      } catch (Exception e) {
         e.printStackTrace();
      }
   }
}

最后，这里是xml：

<?xml version="1.0" encoding="UTF-8"?>
<Anime>
    <record ID="BL1">
        <name>Bleach</name>
        <altname>Burichi</altname>
        <seasons>16</seasons>
        <episodes>366</episodes>
        <status>Finished</status>
        <sound>Dubbed</sound>
        <have>All</have>
        <left>-/-</left>
        <plot>Ichigo gets grim reaper powers, fights reapers, hollows and everything in between</plot>
        <connect>Bleach movies</connect>
        <image>images/bleach.jpg</image>
    </record>
</Anime>

漂白剂
布里基
16
366
完成了
配音
全部的
-/-
一护获得了冷酷收割者的力量，与收割者、空洞以及其间的一切战斗
漂白电影
图片/漂白剂.jpg

---

非常感谢您的帮助，谢谢您基本上您对w3c dom xml元素的理解是错误的。“name:，“altname”等不是“Animie”元素的属性。它们是“record”节点的“child nodes”。因此，首先您必须通过迭代“Animie”元素的子节点来获取“record”节点。然后您可以迭代“record”元素的子节点，以便填充动画对象

下面是“xmlmx”类的一个简单实现。我不得不使用map，因为您已经使用了setter方法，这可以通过尝试在您的头脑中修复xml概念来改进

把你的课换成这个

package test;

import java.io.File;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;

import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.DocumentBuilder;

import com.sun.org.apache.xerces.internal.dom.DeferredElementImpl;
import org.w3c.dom.Document;
import org.w3c.dom.NodeList;
import org.w3c.dom.Node;
import org.w3c.dom.Element;

public class xmlmx {

    public static void main(String[] args) {
        ArrayList<Anime> list = new ArrayList<Anime>();
        try {
            File inputFile = new File("test.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());

            Node recordNode = null;
            NodeList childNodes = doc.getFirstChild().getChildNodes();
            for (int i = 0; i < childNodes.getLength(); i++) {
                if (childNodes.item(i).getNodeName().equals("record")) {
                    recordNode = childNodes.item(i);
                    break;
                }
            }
            System.out.println("----------------------------");


            Map<String, String> map = new HashMap<>();
            if (recordNode != null) {
                NodeList subNodes = recordNode.getChildNodes();
                for (int i = 0; i < subNodes.getLength(); i++) {
                    if (subNodes.item(i).getNodeType() == Node.ELEMENT_NODE) {
                        map.put(subNodes.item(i).getNodeName(), subNodes.item(i).getTextContent());
                    }
                }
            }

            String id = ((DeferredElementImpl) recordNode).getAttribute("ID");
            list.add(new Anime(id,
                    map.get("name"),
                    map.get("altname"),
                    map.get("seasons"),
                    map.get("episodes"),
                    map.get("status"),
                    map.get("DS"),
                    map.get("have"),
                    map.get("left"),
                    map.get("plot"),
                    map.get("connect"),
                    map.get("image")));

            System.out.println(list.get(0));


        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

封装测试；
导入java.io.File；
导入java.util.ArrayList；
导入java.util.HashMap；
导入java.util.Map；
导入javax.xml.parsers.DocumentBuilderFactory；
导入javax.xml.parsers.DocumentBuilder；
导入com.sun.org.apache.xerces.internal.dom.DeferredElementImpl；
导入org.w3c.dom.Document；
导入org.w3c.dom.NodeList；
导入org.w3c.dom.Node；
导入org.w3c.dom.Element；
公共类xmlmx{
公共静态void main（字符串[]args）{
ArrayList=新建ArrayList（）；
试一试{
File inputFile=新文件（“test.xml”）；
DocumentBuilderFactory dbFactory=DocumentBuilderFactory.newInstance（）；
DocumentBuilder dBuilder=dbFactory.newDocumentBuilder（）；
Document doc=dBuilder.parse（inputFile）；
doc.getDocumentElement（）.normalize（）；
System.out.println（“根元素：+doc.getDocumentElement（）.getNodeName（））；
Node-recordNode=null；
NodeList childNodes=doc.getFirstChild（）.getChildNodes（）；
对于（int i=0；i

使用ObjectMapper

还是要一份清单

new XmlMapper().readValue(yourDataAsInputStream, new TypeReference<List<Anime>>(){});

使用Testdata：

47711679.xml

<?xml version="1.0" encoding="UTF-8"?>

<Anime id="1">
    <name>Bleach</name>
    <altname>Burichi</altname>
    <seasons>16</seasons>
    <episodes>366</episodes>
    <status>Finished</status>
    <sound>Dubbed</sound>
    <have>All</have>
    <left>-/-</left>
    <plot>Ichigo gets grim reaper powers, fights reapers, hollows and everything in between</plot>
    <connect>Bleach movies</connect>
    <image>images/bleach.jpg</image>
</Anime>

对于单个条目47711679.xml：

Anime [ID=1, name=Bleach, altname=Burichi, seasons=16, episodes=366, status=Finished, DS=null, have=All, left=-/-, plot=Ichigo gets grim reaper powers, fights reapers, hollows and everything in between, connect=Bleach movies, sound=Dubbed, image=images/bleach.jpg]

我用的是杰克逊2.8.6

<dependency>
        <groupId>com.fasterxml.jackson.dataformat</groupId>
        <artifactId>jackson-dataformat-xml</artifactId>
        <version>2.8.6</version>
    </dependency>

com.fasterxml.jackson.dataformat
jackson数据格式xml
2.8.6

谢谢sudheera，这非常有效！通过一些调整，我现在已经启动并运行了：）我知道这是一种过时的方法，只是为了尝试这种方法而想尝试一下。虽然谢谢你提供关于杰克逊的信息，我下一步会试试：）没问题，如果你觉得我的答案有用，你可以投票。DOM在XML处理中仍然占有一席之地。但是，每当数据被读取到POJO时，对象映射器的使用就变得更加方便。为了只使用部分xml数据，STAX和XPATH/XSLT是更好的工具。就我的5ct。

package stack47711679;

import com.fasterxml.jackson.dataformat.xml.annotation.JacksonXmlProperty;

public class Anime{
    @JacksonXmlProperty(isAttribute = true)
    public String  id;
    public String name;
    public String altname;
    public String seasons;
    public String episodes;
    public String status;
    public String DS;
    public String have;
    public String left;
    public String plot;
    public String connect;
    public String image;
    public String sound;
    public Anime(){
    }

    @Override
    public String toString() {
        return "Anime [ID=" + id + 
           ", name=" + name + 
           ", altname=" + altname + 
           ", seasons=" + seasons + 
           ", episodes=" + episodes + 
           ", status=" + status + 
           ", DS=" + DS + 
           ", have=" + have + 
           ", left=" + left + 
           ", plot=" + plot + 
           ", connect=" + connect + 
           ", sound=" + sound + 
           ", image=" + image + "]";
    }
}

<?xml version="1.0" encoding="UTF-8"?>

<Anime id="1">
    <name>Bleach</name>
    <altname>Burichi</altname>
    <seasons>16</seasons>
    <episodes>366</episodes>
    <status>Finished</status>
    <sound>Dubbed</sound>
    <have>All</have>
    <left>-/-</left>
    <plot>Ichigo gets grim reaper powers, fights reapers, hollows and everything in between</plot>
    <connect>Bleach movies</connect>
    <image>images/bleach.jpg</image>
</Anime>

<?xml version="1.0" encoding="UTF-8"?>
<Animes>
<Anime id="1">
    <name>Bleach</name>
    <altname>Burichi</altname>
    <seasons>16</seasons>
    <episodes>366</episodes>
    <status>Finished</status>
    <sound>Dubbed</sound>
    <have>All</have>
    <left>-/-</left>
    <plot>Ichigo gets grim reaper powers, fights reapers, hollows and everything in between</plot>
    <connect>Bleach movies</connect>
    <image>images/bleach.jpg</image>
</Anime>
<Anime id="2">
    <name>Something</name>
    <altname>else</altname>
    <seasons>21</seasons>
    <episodes>34</episodes>
    <status>to be continued</status>
    <sound>Dubbed</sound>
    <have>All</have>
    <left>-/-</left>
    <plot>Yes it has one</plot>
    <connect>Bleach movies</connect>
    <image>images/bleach.jpg</image>
</Anime>
</Animes>

[Anime [ID=1, name=Bleach, altname=Burichi, seasons=16, episodes=366, status=Finished, DS=null, have=All, left=-/-, plot=Ichigo gets grim reaper powers, fights reapers, hollows and everything in between, connect=Bleach movies, sound=Dubbed, image=images/bleach.jpg], Anime [ID=2, name=Something, altname=else, seasons=21, episodes=34, status=to be continued, DS=null, have=All, left=-/-, plot=Yes it has one, connect=Bleach movies, sound=Dubbed, image=images/bleach.jpg]]

Anime [ID=1, name=Bleach, altname=Burichi, seasons=16, episodes=366, status=Finished, DS=null, have=All, left=-/-, plot=Ichigo gets grim reaper powers, fights reapers, hollows and everything in between, connect=Bleach movies, sound=Dubbed, image=images/bleach.jpg]

<dependency>
        <groupId>com.fasterxml.jackson.dataformat</groupId>
        <artifactId>jackson-dataformat-xml</artifactId>
        <version>2.8.6</version>
    </dependency>