JAva遍歴xmlファイル内容の読み出し

本文の例はjavaがxmlファイルの内容を遍歴して読み取る詳細なコードを説明して、みんなに参考にしてあげて、具体的な内容は以下の通りです

package test;
 
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Iterator;
 
import javax.xml.namespace.NamespaceContext;
import javax.xml.namespace.QName;
import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLOutputFactory;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import javax.xml.stream.XMLStreamWriter;
 
import org.apache.axiom.om.OMAbstractFactory;
import org.apache.axiom.om.OMAttribute;
import org.apache.axiom.om.OMComment;
import org.apache.axiom.om.OMContainer;
import org.apache.axiom.om.OMDataSource;
import org.apache.axiom.om.OMDocType;
import org.apache.axiom.om.OMDocument;
import org.apache.axiom.om.OMElement;
import org.apache.axiom.om.OMException;
import org.apache.axiom.om.OMFactory;
import org.apache.axiom.om.OMNamespace;
import org.apache.axiom.om.OMProcessingInstruction;
import org.apache.axiom.om.OMSourcedElement;
import org.apache.axiom.om.OMText;
import org.apache.axiom.om.OMXMLParserWrapper;
import org.apache.axiom.om.impl.builder.StAXOMBuilder;
import org.xml.sax.helpers.XMLReaderFactory;
 
public class Axiomtest {
 public static void main(String[] args) throws FileNotFoundException, Throwable {
//  read xml
    FileInputStream xmlFile = new FileInputStream("line-item2.xml");
    XMLStreamReader parser = XMLInputFactory.newInstance().createXMLStreamReader(xmlFile);
 
    //    StAXOMBuilder  
    StAXOMBuilder builder = new StAXOMBuilder(parser);
    
    OMElement doc = builder.getDocumentElement();   //        
    
    OMElement cre = doc.getFirstChildWithName(new QName("student")); //  
    
    OMElement cre1 = cre.getFirstChildWithName(new QName("id")); //    
    System.out.println(cre1.getLocalName()+":"+cre1.getText());
    cre1 = cre.getFirstChildWithName(new QName("name"));    //    
    System.out.println(cre1.getLocalName()+":"+cre1.getText()); 
   
    cre1 = cre.getFirstChildWithName(new QName("age"));   //    
    System.out.println(cre1.getLocalName()+":"+cre1.getText());  
    
    cre1 = cre.getFirstChildWithName(new QName("sex"));   //    
    System.out.println(cre1.getLocalName()+":"+cre1.getText());
    
    cre1 = cre.getFirstChildWithName(new QName("message"));   //    
    System.out.println(cre1.getLocalName()+":"+cre1.getText());
    
    System.out.println("------------------------------1");
    Iterator iter = doc.getChildElements();
    while(iter.hasNext()){
      OMElement temp = iter.next();
      System.out.println("====================");
      System.out.println(temp.getLocalName());
//      System.out.println(temp.getText());
 
      if(temp.getLocalName().equals("student")){
        Iterator iter1 = temp.getChildElements();
        System.out.println("----------------");
        while(iter1.hasNext()){
          OMElement temp1 = iter1.next();          
          System.out.println(temp1.getLocalName()+":"+temp1.getText());
        }
      }
    }
    System.out.println("!!!!!!!!!!!!!");
    FileInputStream file = new FileInputStream("line-item2.xml");
    XMLStreamReader read = XMLInputFactory.newInstance().createXMLStreamReader(file);
    StAXOMBuilder sta = new StAXOMBuilder(read);
    OMElement all = sta.getDocumentElement();
    Iterator ite1 = all.getChildElements();
    while(ite1.hasNext()){
      OMElement temp = ite1.next();
      if(temp.getLocalName().equals("student")){
       Iterator ite2 = temp.getChildElements();
       while(ite2.hasNext()){
         OMElement temp1 = ite2.next();
         System.out.println(temp1.getLocalName()+":"+temp1.getText());
      }     
    }
   }    
//    write xml
    
    OMFactory factory = OMAbstractFactory.getOMFactory();
    
    //  doc  ,doc       root    
    OMDocument dod = factory.createOMDocument();
    
    //  root  
    OMElement root = factory.createOMElement("root","","");
    OMElement add = factory.createOMElement("dabi","","");
    //        
    OMElement stu = factory.createOMElement("student","","");
    stu.addChild(factory.createOMText("mac"));
 
    OMElement tea = factory.createOMElement("teacher","","");
    tea.addChild(factory.createOMText("silly"));
    
    //   ,         root   
    root.addChild(stu);
    root.addChild(tea);
    //   , root    doc   
    dod.addChild(root);
    
    //   writer    
    XMLStreamWriter writer = XMLOutputFactory.newInstance().createXMLStreamWriter(
        new FileOutputStream("2.xml"));
    root.serialize(writer); // cache on
    writer.flush();
    
    FileInputStream xmlFile1 = new FileInputStream("2.xml");
    XMLStreamReader parser1 = XMLInputFactory.newInstance().createXMLStreamReader(xmlFile1);
    
    StAXOMBuilder builder1 = new StAXOMBuilder(parser1);
    OMElement doc1 = builder1.getDocumentElement();
    
    Iterator iter1 = doc1.getChildElements();
    while(iter1.hasNext()){
      OMElement temp = iter1.next();
      System.out.println("====================");
      System.out.println(temp.getLocalName()+":"+temp.getText());
    }
 
    
    System.out.println("!!!!!!!!");
 
    OMFactory omf = OMAbstractFactory.getOMFactory();
//    OMDocument od = omf.createOMDocument();
    OMElement root1 = omf.createOMElement("root","","");
    OMElement name = omf.createOMElement("name","","");
    OMElement sex = omf.createOMElement("sexy","","");
    sex.addChild(omf.createOMText("man"));
    name.addChild(omf.createOMText("dabi"));
    root1.addChild(sex);
    root1.addChild(name);
//    od.addChild(root1);
    
    XMLStreamWriter xmlw = XMLOutputFactory.newInstance().createXMLStreamWriter(new FileOutputStream("3.xml"));
    root1.serialize(xmlw);
    
    xmlw.flush();
 }
}

  
    mac
    12
    33
    male
    hello world
  
  
    silly
    5
    12
    female
  
  
    Mr. Jones
    2
    31
    male
  
  
    macy
    2
    40
    female
  
  
    tom
    32
    31
    male
  
  hello world

再共有一例:XMLファイルをJAVAで読み込む
XMLを解析するには、次の手順に従います.

  1.DocumentBuilderファクトリ

の作成

  2.DocumentBuilderオブジェクト

の作成

  3.DocumentBuilderオブジェクトのparseメソッドDocumentオブジェクト

を得る

  4.DocumentオブジェクトのgetElementsByTagName取得NodeListコレクション

  5.getFirstChildとgetNextSiblingによる遍歴 

使用するパッケージ:

import javax.xml.parsers.*;

import org.w3c.dom.*;

import org.xml.sax.*;

使用するオブジェクト:

DocumentBuilderFactory:DocumentBuilderの抽象ファクトリ

を作成する

DocumentBuilder:XMLからDocument

を取得できます.

Document:文書データへの基本的なアクセスを提供する

使用する方法:

DocumentBuilder.parse(String)':与えられたURIの内容をXMLドキュメントとして解析し、新しいDOM Documentオブジェクト

を返す.

Document.getElementsByTagName(String)':指定したタグ名を持つすべてのElementのNodeList

を返します.

Element.getAttribute(String)':属性値

を名前で取得
XMLファイルを解析します

import javax.xml.parsers.*; 
import org.w3c.dom.*; 
import org.xml.sax.*; 
 
public class Test 
{ 
  public static void main(String[] args) 
  { 
    DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance(); 
    try 
    { 
      DocumentBuilder db = dbf.newDocumentBuilder(); 
      Document doc = db.parse("pet2.xml"); 
 
      NodeList dogList = doc.getElementsByTagName("dog"); 
      System.out.println("  " + dogList.getLength() + " dog  "); 
      for (int i = 0; i < dogList.getLength(); i++) 
      { 
        Node dog = dogList.item(i); 
        Element elem = (Element) dog; 
        System.out.println("id:" + elem.getAttribute("id")); 
        for (Node node = dog.getFirstChild(); node != null; node = node.getNextSibling()) 
        { 
          if (node.getNodeType() == Node.ELEMENT_NODE) 
          { 
            String name = node.getNodeName(); 
            String value = node.getFirstChild().getNodeValue(); 
            System.out.print(name + ":" + value + "\t"); 
          } 
        } 
        System.out.println(); 
      } 
    } 
    catch (Exception e) 
    { 
      e.printStackTrace(); 
    } 
  } 
} 

XMLファイル

 
   
          
      YAYA 
      100 
      0 
             
     
          
      OUOU 
      90 
      15 
               
     
   
   
          
      QQ 
      100 
      20 
      Q        
         
   
 

以上が本文のすべての内容で、みんなの学習に役立つことを望みます.