[XPATH] Extraction d'un attribut

Extraction d'un attribut

Bonjour,
Je cherche à obtenir le prix du produit 321 du fichier XML suivant :

Code:

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<?xml version="1.0" encoding="ISO-8859-1"?>
 <inventaire>
 <produit code="1" prix="432.00" quantité= "43" />
 <produit code="32" prix="32.00" quantité= "100"  />
 <produit code="321" prix="31.00" quantité= "200"  />
 </inventaire>

Voici mon code :

Code:

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import javax.xml.parsers.*;
import javax.xml.xpath.*;
import java.io.*;
 
public class inventaire {
public static void main(String[] args) throws Exception {
DocumentBuilderFactory dbfact = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = dbfact.newDocumentBuilder();
Document inventaire =
builder.parse("inventaire.xml");
XPathFactory fact = XPathFactory.newInstance();
XPath xpath = fact.newXPath();
String prix321 = xpath.evaluate("//produit[@code=”321”]/@prix", inventaire);
System.out.println(prix321);
}
}

J'ai essayé de faire un code minimal mais malheureusement j’obtiens l’erreur suivante en ligne de commande :(:

Code:

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inventaire.java:8: error: cannot find symbol
Document inventaire =
^
  symbol:   class Document
  location: class inventaire
1 error

Merci pour vos lumières !

Radu

Tu as oublié dans tes import cette classe Document.

Extraction d'un attribut (problème de jeton)

Merci tchize ! Pour l'import de la classe Document, j’ai ajouté :

Code:

import org.w3c.dom.*;

Mais maintenant j’ai une erreur de 2km ::cry:

Code:

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Exception in thread "main" javax.xml.transform.TransformerException: Un chemin d
'accÞs Útait attendu, mais le jeton suivant a ÚtÚ dÚtectÚ : ö321ö
        at com.sun.org.apache.xpath.internal.compiler.XPathParser.error(XPathPar
ser.java:612)
        at com.sun.org.apache.xpath.internal.compiler.XPathParser.LocationPath(X
PathParser.java:1603)
        at com.sun.org.apache.xpath.internal.compiler.XPathParser.PathExpr(XPath
Parser.java:1319)
        at com.sun.org.apache.xpath.internal.compiler.XPathParser.UnionExpr(XPat
hParser.java:1238)
        at com.sun.org.apache.xpath.internal.compiler.XPathParser.UnaryExpr(XPat
hParser.java:1144)
        at com.sun.org.apache.xpath.internal.compiler.XPathParser.Multiplicative
Expr(XPathParser.java:1065)
        at com.sun.org.apache.xpath.internal.compiler.XPathParser.AdditiveExpr(X
PathParser.java:1007)
        at com.sun.org.apache.xpath.internal.compiler.XPathParser.RelationalExpr
(XPathParser.java:932)
        at com.sun.org.apache.xpath.internal.compiler.XPathParser.EqualityExpr(X
PathParser.java:872)
        at com.sun.org.apache.xpath.internal.compiler.XPathParser.EqualityExpr(X
PathParser.java:896)
        at com.sun.org.apache.xpath.internal.compiler.XPathParser.AndExpr(XPathP
arser.java:836)
        at com.sun.org.apache.xpath.internal.compiler.XPathParser.OrExpr(XPathPa
rser.java:809)
        at com.sun.org.apache.xpath.internal.compiler.XPathParser.Expr(XPathPars
er.java:792)
        at com.sun.org.apache.xpath.internal.compiler.XPathParser.PredicateExpr(
XPathParser.java:1956)
        at com.sun.org.apache.xpath.internal.compiler.XPathParser.Predicate(XPat
hParser.java:1938)
        at com.sun.org.apache.xpath.internal.compiler.XPathParser.Step(XPathPars
er.java:1728)
        at com.sun.org.apache.xpath.internal.compiler.XPathParser.RelativeLocati
onPath(XPathParser.java:1628)
        at com.sun.org.apache.xpath.internal.compiler.XPathParser.LocationPath(X
PathParser.java:1599)
        at com.sun.org.apache.xpath.internal.compiler.XPathParser.PathExpr(XPath
Parser.java:1319)
        at com.sun.org.apache.xpath.internal.compiler.XPathParser.UnionExpr(XPat
hParser.java:1238)
        at com.sun.org.apache.xpath.internal.compiler.XPathParser.UnaryExpr(XPat
hParser.java:1144)
        at com.sun.org.apache.xpath.internal.compiler.XPathParser.Multiplicative
Expr(XPathParser.java:1065)
        at com.sun.org.apache.xpath.internal.compiler.XPathParser.AdditiveExpr(X
PathParser.java:1007)
        at com.sun.org.apache.xpath.internal.compiler.XPathParser.RelationalExpr
(XPathParser.java:932)
        at com.sun.org.apache.xpath.internal.compiler.XPathParser.EqualityExpr(X
PathParser.java:872)
        at com.sun.org.apache.xpath.internal.compiler.XPathParser.AndExpr(XPathP
arser.java:836)
        at com.sun.org.apache.xpath.internal.compiler.XPathParser.OrExpr(XPathPa
rser.java:809)
        at com.sun.org.apache.xpath.internal.compiler.XPathParser.Expr(XPathPars
er.java:792)
        at com.sun.org.apache.xpath.internal.compiler.XPathParser.initXPath(XPat
hParser.java:131)
        at com.sun.org.apache.xpath.internal.XPath.<init>(XPath.java:180)
        at com.sun.org.apache.xpath.internal.XPath.<init>(XPath.java:268)
        at com.sun.org.apache.xpath.internal.jaxp.XPathImpl.eval(XPathImpl.java:
188)
        at com.sun.org.apache.xpath.internal.jaxp.XPathImpl.evaluate(XPathImpl.j
ava:270)
        at com.sun.org.apache.xpath.internal.jaxp.XPathImpl.evaluate(XPathImpl.j
ava:360)
        at inventaire.main(inventaire.java:14)
--------------- linked to ------------------
javax.xml.xpath.XPathExpressionException
        at com.sun.org.apache.xpath.internal.jaxp.XPathImpl.evaluate(XPathImpl.j
ava:284)
        at com.sun.org.apache.xpath.internal.jaxp.XPathImpl.evaluate(XPathImpl.j
ava:360)
        at inventaire.main(inventaire.java:14)
Caused by: javax.xml.transform.TransformerException: Un chemin d'accÞs Útait att
endu, mais le jeton suivant a ÚtÚ dÚtectÚ : ö321ö
        at com.sun.org.apache.xpath.internal.compiler.XPathParser.error(XPathPar
ser.java:612)
        at com.sun.org.apache.xpath.internal.compiler.XPathParser.LocationPath(X
PathParser.java:1603)
        at com.sun.org.apache.xpath.internal.compiler.XPathParser.PathExpr(XPath
Parser.java:1319)
        at com.sun.org.apache.xpath.internal.compiler.XPathParser.UnionExpr(XPat
hParser.java:1238)
        at com.sun.org.apache.xpath.internal.compiler.XPathParser.UnaryExpr(XPat
hParser.java:1144)
        at com.sun.org.apache.xpath.internal.compiler.XPathParser.Multiplicative
Expr(XPathParser.java:1065)
        at com.sun.org.apache.xpath.internal.compiler.XPathParser.AdditiveExpr(X
PathParser.java:1007)
        at com.sun.org.apache.xpath.internal.compiler.XPathParser.RelationalExpr
(XPathParser.java:932)
        at com.sun.org.apache.xpath.internal.compiler.XPathParser.EqualityExpr(X
PathParser.java:872)
        at com.sun.org.apache.xpath.internal.compiler.XPathParser.EqualityExpr(X
PathParser.java:896)
        at com.sun.org.apache.xpath.internal.compiler.XPathParser.AndExpr(XPathP
arser.java:836)
        at com.sun.org.apache.xpath.internal.compiler.XPathParser.OrExpr(XPathPa
rser.java:809)
        at com.sun.org.apache.xpath.internal.compiler.XPathParser.Expr(XPathPars
er.java:792)
        at com.sun.org.apache.xpath.internal.compiler.XPathParser.PredicateExpr(
XPathParser.java:1956)
        at com.sun.org.apache.xpath.internal.compiler.XPathParser.Predicate(XPat
hParser.java:1938)
        at com.sun.org.apache.xpath.internal.compiler.XPathParser.Step(XPathPars
er.java:1728)
        at com.sun.org.apache.xpath.internal.compiler.XPathParser.RelativeLocati
onPath(XPathParser.java:1628)
        at com.sun.org.apache.xpath.internal.compiler.XPathParser.LocationPath(X
PathParser.java:1599)
        at com.sun.org.apache.xpath.internal.compiler.XPathParser.PathExpr(XPath
Parser.java:1319)
        at com.sun.org.apache.xpath.internal.compiler.XPathParser.UnionExpr(XPat
hParser.java:1238)
        at com.sun.org.apache.xpath.internal.compiler.XPathParser.UnaryExpr(XPat
hParser.java:1144)
        at com.sun.org.apache.xpath.internal.compiler.XPathParser.Multiplicative
Expr(XPathParser.java:1065)
        at com.sun.org.apache.xpath.internal.compiler.XPathParser.AdditiveExpr(X
PathParser.java:1007)
        at com.sun.org.apache.xpath.internal.compiler.XPathParser.RelationalExpr
(XPathParser.java:932)
        at com.sun.org.apache.xpath.internal.compiler.XPathParser.EqualityExpr(X
PathParser.java:872)
        at com.sun.org.apache.xpath.internal.compiler.XPathParser.AndExpr(XPathP
arser.java:836)
        at com.sun.org.apache.xpath.internal.compiler.XPathParser.OrExpr(XPathPa
rser.java:809)
        at com.sun.org.apache.xpath.internal.compiler.XPathParser.Expr(XPathPars
er.java:792)
        at com.sun.org.apache.xpath.internal.compiler.XPathParser.initXPath(XPat
hParser.java:131)
        at com.sun.org.apache.xpath.internal.XPath.<init>(XPath.java:180)
        at com.sun.org.apache.xpath.internal.XPath.<init>(XPath.java:268)
        at com.sun.org.apache.xpath.internal.jaxp.XPathImpl.eval(XPathImpl.java:
188)
        at com.sun.org.apache.xpath.internal.jaxp.XPathImpl.evaluate(XPathImpl.j
ava:270)
        ... 2 more

Comme le montre la coloration syntaxique, les guillemets autour du 321 sont des guillemets littéraires, non-ASCII. Ce n'est pas de la syntaxe valide.

” et ", ce n'est pas la même chose. Les guillements dans xpath, c'est " ou ' et rien d'autre.