Question

我正在构建一个天气应用程序，我需要使用 URL 中的数据填充 .xml 文件。

XML 文件的网址是 http://vrijeme.hr/hrvatska_n.xml ，我创建了一个名为 NewFile.xml 的文件。

当我手动下载此URL数据并将其导入 Eclipse IDE 时，它可以正常工作。但是这样一种方式，我无法获得远程资源的las内容。

以下是我使用的代码部分：

String readXML = null;
URL url = null;
URLConnection urlconn = null;

try {
    url = new URL("http://vrijeme.hr/hrvatska_n.xml");
    urlconn = url.openConnection();
} catch (IOException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
}

try {
    InputStreamReader inst = new InputStreamReader(urlconn.getInputStream());
    BufferedReader bfr = new BufferedReader(inst);
    boolean eof = false;
    while (!eof) {
        readXML = bfr.readLine();
        if (readXML == null) {
            eof = true;
        }
    }
} catch (IOException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
}

try {
    FileOutputStream fout = new FileOutputStream("NewFile.xml");
    Writer out = new OutputStreamWriter(fout, "UTF8");
    out.write(readXML);
} catch (IOException z) {
    System.out.println("Nešto se sjebalo.");
}

try {
    DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
    DocumentBuilder builder = factory.newDocumentBuilder();
    Document doc = builder.parse("NewFile.xml");                                            //Dokument

    NodeList cityList = doc.getElementsByTagName("GradIme");
    Node cNode = cityList.item(12);

    if (cNode.getNodeType() == Node.ELEMENT_NODE) {

        Element cElement = (Element) cNode;
        String city = cElement.getTextContent();
        System.out.println("Ime grada: " + city);
    }

    NodeList tempList = doc.getElementsByTagName("Temp");                                //Element po nazivu
    Node nNode = tempList.item(12);                                                        //Item number

    if (nNode.getNodeType() == Node.ELEMENT_NODE) {                                        // provjeta tipa podataka == Element

        Element eElement = (Element) nNode;                                            // Element nNode
        String temperatura = eElement.getTextContent();                                    //uzima text iz elementa
        System.out.println("Temperatura:" + temperatura + " C");

        NodeList vlagaList = doc.getElementsByTagName("Vlaga");
        Node vNode = vlagaList.item(12);

        if (vNode.getNodeType() == Node.ELEMENT_NODE) {

            Element vElement = (Element) vNode;
            String vlaga = vElement.getTextContent();
            System.out.println("Vlaga u zraku: " + vlaga + "%");
        }
    }
} catch (ParserConfigurationException | IOException | SAXException e) {
    e.printStackTrace();
}

Answer 1

您可以尝试使用此代码，它使用的是Java 8 nio API。

  <script src= "http://code.jquery.com/jquery-1.10.2.min.js" type="text/javascript"></script>
  <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>

Answer 2

您应该设法清理readXml方法：您几乎将文件读取和写入的代码块分开，当您尝试将null输入为public static void main(String[] args) { String readXML; URL url; URLConnection urlconn; try { url = new URL("http://vrijeme.hr/hrvatska_n.xml"); urlconn = url.openConnection(); BufferedReader bfr = null; InputStreamReader inst = null; FileOutputStream fout = null; Writer out = null; try { // read & write in the same block inst = new InputStreamReader(urlconn.getInputStream()); bfr = new BufferedReader(inst); fout = new FileOutputStream("NewFile.xml"); out = new OutputStreamWriter(fout, "UTF8"); while ((readXML = bfr.readLine()) != null) { out.write(readXML); } } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } finally { // cleanup your resources if (out != null) { out.close(); } if (fout != null) { fout.close(); } if (bfr != null) { bfr.close(); } if (inst != null) { inst.close(); } } } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } try { DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); DocumentBuilder builder = factory.newDocumentBuilder(); Document doc = builder.parse("NewFile.xml"); //Dokument NodeList cityList = doc.getElementsByTagName("GradIme"); Node cNode = cityList.item(12); if (cNode.getNodeType() == Node.ELEMENT_NODE) { Element cElement = (Element) cNode; String city = cElement.getTextContent(); System.out.println("Ime grada: " + city); } NodeList tempList = doc.getElementsByTagName("Temp"); //Element po nazivu Node nNode = tempList.item(12); //Item number if (nNode.getNodeType() == Node.ELEMENT_NODE) { // provjeta tipa podataka == Element Element eElement = (Element) nNode; // Element nNode String temperatura = eElement.getTextContent(); //uzima text iz elementa System.out.println("Temperatura:" + temperatura + " C"); NodeList vlagaList = doc.getElementsByTagName("Vlaga"); Node vNode = vlagaList.item(12); if (vNode.getNodeType() == Node.ELEMENT_NODE) { Element vElement = (Element) vNode; String vlaga = vElement.getTextContent(); System.out.println("Vlaga u zraku: " + vlaga + "%"); } } } catch (ParserConfigurationException | IOException | SAXException e) { e.printStackTrace(); } }时目标文件。

这里有一个稍微修改过的源代码版本：

SMTP=smtp.gmail.com
smtp_port=587
sendmail_from = your-gmail-id@gmail.com
sendmail_path = "\"C:\xampp\sendmail\sendmail.exe\" -t"

如何从URL填充我的.xml文件？

2 个答案: