Question

在我的java项目中，我需要解组一个xml文件才能获得一个对象列表。

解组工作非常正常，但在修改文件内容时会引发问题。实际上在这个项目中我们可以通过点击“addButon”向这个文件中添加新的内容，但是当我想要另一个时间解组同一个文件（修改后）后，我只得到没有最后一个元素的旧对象列表（我刚刚添加到此文件）。

我已经验证了磁盘上的物理xml文件，我找到了刚刚添加的所有内容。另外我注意到获取最后一个对象列表的唯一方法是关闭appli并再次重新打开它，这是不合适的。

以下是一段代码：

//classe1.java

File iniFile = new File(proprietesPerle.getRepRef() + "referential.xml");

FileInputStream fs = = new FileInputStream(iniFile);

ref = Referentiel.unmarshal(fs);    

TreeMap map = ReferentielUtil.getApplication( ref );

...


//classe2.java

TreeMap map = new TreeMap();

List         listPL = app.getPl(); //this list is unmarshalled from the xml file

ListIterator itpl    = listPL.listIterator();

while (itpl.hasNext())
 {

   Pl pl = (Pl)itpl.next();

   map.put(pl.getCode(), pl);
 }

return map;

...

非常感谢伊戈尔的回复

In fact we select an app from a combobox, it's type is "Application" and this variable is stocked in a session. we use it like this:

session.setAttribute("selectedApplication",selectedAppli); 
TreeMap mapp = ReferentielUtil.getPl(selectedAppli.getApp());

//Class ReferentielUtil.java
public static TreeMap getPl(Application app)
{
    logger.debug("getPl");
    logger.debug("passe 10");
    TreeMap map = new TreeMap();

    List  listPL = app.getPl();
    ListIterator itpl    = listPL.listIterator();
    while (itpl.hasNext())
    {
        Pl pl = (Pl)itpl.next();

        map.put(pl.getCode(), pl);
    }
    return map;
}

inside Referentiel.unmarshal, you will find a code like this:

 public void unmarshal(Unmarshaller u)
    throws UnmarshalException
{

    XMLScanner xs = u.scanner();
    xs.takeStart("application");
    while (xs.atAttribute()) {
        String an = xs.takeAttributeName();
        throw new InvalidAttributeException(an);
    }
    if (xs.atStart("code")) {
        xs.takeStart("code");
        String s;
        if (xs.atChars(XMLScanner.WS_COLLAPSE)) {
            s = xs.takeChars(XMLScanner.WS_COLLAPSE);
        } else {
            s = "";
        }
        try {
            _Code = String.valueOf(s);
        } catch (Exception x) {
            throw new ConversionException("code", x);
        }
        xs.takeEnd("code");
    }
    if (xs.atStart("libelle")) {
        xs.takeStart("libelle");
        String s;
        if (xs.atChars(XMLScanner.WS_COLLAPSE)) {
            s = xs.takeChars(XMLScanner.WS_COLLAPSE);
        } else {
            s = "";
        }
        try {
            _Libelle = String.valueOf(s);
        } catch (Exception x) {
            throw new ConversionException("libelle", x);
        }
        xs.takeEnd("libelle");
    }
    _TypeApplication = ((TypeApplication) u.unmarshal());
    if (xs.atStart("entite")) {
        xs.takeStart("entite");
        String s;
        if (xs.atChars(XMLScanner.WS_COLLAPSE)) {
            s = xs.takeChars(XMLScanner.WS_COLLAPSE);
        } else {
            s = "";
        }
        try {
            _Entite = String.valueOf(s);
        } catch (Exception x) {
            throw new ConversionException("entite", x);
        }
        xs.takeEnd("entite");
    }
    {
        List l = PredicatedLists.create(this, pred_Pl, new ArrayList());
        while (xs.atStart("pl")) {
            l.add(((Pl) u.unmarshal())); // the problem is here : unmarshal() dont gives the last element --------------
        }
        _Pl = PredicatedLists.createInvalidating(this, pred_Pl, l);
    }
    xs.takeEnd("application");  

}

I noticed that in (while loop) we dont get the last element Pl which we want to add to the list "l"

Please do you have any idea?

Answer 1

是的，看起来好像你没有关闭/刷新outputStream对象。试试看，它应该有所帮助。

解组修改后的xml文件

1 个答案: