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javaでDOM（１）

Last-modified: 2013-08-24 (土) 02:14:21 (3896d)
Top / javaでDOM（１）

javaでXpathを使う（１）

package example.ex3;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.io.StringReader;
import java.io.StringWriter;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathExpression;
import javax.xml.xpath.XPathExpressionException;
import javax.xml.xpath.XPathFactory;

import org.w3c.dom.Document;
import org.w3c.dom.NodeList;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;

public class XMLSample1 {


    private static final String IN_FILENAME="TestFileName.xml";
    private static final String OUT_FILENAME="OUT.xml";

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO 自動生成されたメソッド・スタブ

            try {
              // DocumentBuilderFactory インスタンスを取得
              DocumentBuilderFactory factory =
                  DocumentBuilderFactory.newInstance();

              factory.setNamespaceAware(true); // never forget this!

              File inputFile = new File(IN_FILENAME);

              BufferedReader br = new BufferedReader(new FileReader(IN_FILENAME));

              StringBuffer in = new StringBuffer();

              String tmp;
              while ((tmp = br.readLine()) != null){
                  in.append(tmp);
              }

              InputSource is = new InputSource(new StringReader(in.toString()));


              // DocumentBuilder を取得
              DocumentBuilder builder =
              factory.newDocumentBuilder();

              // DocumentBuilder を用いて Document オブジェクトを取得
//              Document doc = builder.parse(new File(IN_FILENAME));
              Document doc = builder.parse(is);
              XPathFactory xPathFactory = XPathFactory.newInstance();
              XPath xpath = xPathFactory.newXPath();

              XPathExpression expr = xpath.compile("//book[author='Neal Stephenson']/title/text()");
//              XPathExpression expr = xpath.compile("//book");
              Object result = expr.evaluate(doc, XPathConstants.NODESET);


              NodeList nodeList = (NodeList) result;
              for (int i = 0; i < nodeList.getLength(); i++) {
                  System.out.println(nodeList.item(i).getNodeValue());
//                  doc.removeChild(nodeList.item(i));
              }

//              System.out.println(doc.);
              StringWriter sw = new StringWriter();
              TransformerFactory tff=TransformerFactory.newInstance();
              Transformer tf = tff.newTransformer();
              tf.setOutputProperty("encoding", "UTF-8");
              tf.transform( new DOMSource(doc), new StreamResult(sw) );

System.out.println(sw);

            } catch (SAXException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            } catch (ParserConfigurationException e) {
                e.printStackTrace();
            } catch (XPathExpressionException e) {
                e.printStackTrace();
            } catch (TransformerException e) {
                // TODO 自動生成された catch ブロック
                e.printStackTrace();
            }
          }

}