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各位程序员你好 :)。

我对Java很陌生,如果这是PHP我已经这样做了:P,无论如何我试图在这里搜索所有答案(stackoverflow)但没有一个适合我的具体问题,或者我没有看到一个例子或者我错过了某事...无论如何,如果您知道与我的问题类似的任何解决方案,请发布答案链接。

好的问题;)

我在一个文件中有这个 XML,我需要它是这样的:

<?xml version="1.0" encoding="UTF-8"?>
<events>
    <event id="46" title="Ferias" start="2013-04-25" end="2013-04-26" allDay="false" editable="true"/>
    <event id="47" title="Falta" start="Wed Apr 17 2013 00:00:00 GMT+0100" end="Thu Apr 18 2013 00:00:00 GMT+0100" allDay="false" editable="true"/>
    <event id="48" title="Tolerancia de Ponto" start="Mon Apr 01 2013 00:00:00 GMT+0100" end="" allDay="false" editable="true"/>    
    <event id="49" title="Titulo teste" start="Thu Apr 11 2013 00:00:00 GMT+0100" end="Sat Apr 13 2013 00:00:00 GMT+0100" allDay="true" editable="true"/>
    <event id="50" title="dfgfdgf" start="Fri Apr 12 2013 00:00:00 GMT+0100" end="Sat Apr 13 2013 00:00:00 GMT+0100" allDay="true" editable="true"/>
    <event id="51" title="hghfjfghj" start="Tue Apr 16 2013 00:00:00 GMT+0100" end="Wed Apr 17 2013 00:00:00 GMT+0100" allDay="true" editable="true"/>
    <event id="52" title="grande evento" start="Tue Apr 23 2013 00:00:00 GMT+0100" end="Wed May 01 2013 00:00:00 GMT+0100" allDay="true" editable="true"/>
</events>

我正在尝试添加一个带有属性的新元素“事件”,我正在使用它来加载和修改:

        String FilePath = "D:/myxml.xml";
    Document doc = openXMLfile(FilePath);

它在这里加载没问题..

openXMLfile 是这样的:

protected Document openXMLfile(String filepath){
    Document doc = null;
    try {
        File fXmlFile = new File(filepath);
        DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
        DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
        doc = dBuilder.parse(fXmlFile);         
    } catch (Exception e) {
        e.printStackTrace();
    }
    return doc;
}

然后在我的函数中添加元素我这样做:

File file = new File("D:\myxml.xml");
Element event = doc.createElement("event");
    event.setAttribute("test","testvalue");
    doc.getDocumentElement().appendChild(event);

    filePutContents(doc,file);

其中 filePutContents 我有这个功能:

protected void filePutContents(Document doc,File file){
    try{                    
        TransformerFactory tFactory = TransformerFactory.newInstance();
        Transformer transformer = tFactory.newTransformer();    
        transformer.setOutputProperty(OutputKeys.INDENT,"yes");

        DOMSource source = new DOMSource(doc);
        //StreamResult result = new StreamResult(System.out);//problem was this
        StreamResult result = new StreamResult(file);//correct way
                transformer.transform(source, result);

    }catch(TransformerConfigurationException tce){
        /*ERRO do Transformer*/         
        System.out.println("* Transformer Factory error");
        System.out.println(" " + tce.getMessage());

        Throwable x = tce;
        if (tce.getException() != null)
            x = tce.getException();
            x.printStackTrace(); 
    }catch(TransformerException te){
        /*ERRO da Factory*/
        System.out.println("* Transformation error");
        System.out.println(" " + te.getMessage());

        Throwable x = te;
        if (te.getException() != null)
            x = te.getException();
            x.printStackTrace();
    }
}

问题是,没有元素被添加到文件中,我想要更新文件,我做错了什么?谢谢

问题解决了,我已经反映了代码的变化;)感谢做帮手:)

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1 回答 1

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StreamResult result = new StreamResult(System.out); 

上面的语句将您的输出定向到控制台(System.out)。如果要更新文件,请将其指向文件。

试试这个-

StreamResult result = new StreamResult(new FileOutputStream("somefile.xml"));
于 2013-04-22T10:39:44.940 回答