Question

对于类项目，我们尝试连接到Google距离矩阵并从xml文件中解析一些数据，但是当我们运行它并填写目标字段并点击下一步时，它会在控制台中抛出以下错误。这是我们正在提取的xml的副本，我们用startingLocation取代芝加哥，用endDestination取代迈阿密。这些值在前一帧中填写，但不包括在内。

http://maps.googleapis.com/maps/api/distancematrix/xml?origins=chicago&destinations=Miami&language=en-EN&sensor=false&language=en-EN&units=imperial

[致命错误]：1：2：根元素之前的文档中的标记必须格式正确。 org.xml.sax.SAXParseException; lineNumber：1; columnNumber：2;根元素之前的文档中的标记必须格式正确。 at com.sun.org.apache.xerces.internal.parsers.DOMParser.parse（Unknown Source） at com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse（Unknown Source）在edu.bsu.cs222.gascalculator.connection.GoogleXMLParser.parseXMLFrom(GoogleXMLParser.java:44）在edu.bsu.cs222.gascalculator.connection.GoogleXMLParser.setUp（GoogleXMLParser.java:23）在edu.bsu.cs222.gascalculator.ui.GasCalculatorFrame.actionPerformed（GasCalculatorFrame.java:107）在javax.swing.AbstractButton.fireActionPerformed（未知来源） at javax.swing.AbstractButton $ Handler.actionPerformed（Unknown Source）在javax.swing.DefaultButtonModel.fireActionPerformed（未知来源）在javax.swing.DefaultButtonModel.setPressed（未知来源）在javax.swing.plaf.basic.BasicButtonListener.mouseReleased（未知来源） at java.awt.Component.processMouseEvent（Unknown Source）在javax.swing.JComponent.processMouseEvent（未知来源） at java.awt.Component.processEvent（Unknown Source） at java.awt.Container.processEvent（Unknown Source） at java.awt.Component.dispatchEventImpl（Unknown Source） at java.awt.Container.dispatchEventImpl（Unknown Source） at java.awt.Component.dispatchEvent（Unknown Source） at java.awt.LightweightDispatcher.retargetMouseEvent（Unknown Source） at java.awt.LightweightDispatcher.processMouseEvent（Unknown Source） at java.awt.LightweightDispatcher.dispatchEvent（Unknown Source） at java.awt.Container.dispatchEventImpl（Unknown Source） at java.awt.Window.dispatchEventImpl（Unknown Source） at java.awt.Component.dispatchEvent（Unknown Source） at java.awt.EventQueue.dispatchEventImpl（Unknown Source）在java.awt.EventQueue.access $ 200（未知来源）在java.awt.EventQueue $ 3.run（未知来源）在java.awt.EventQueue $ 3.run（未知来源） at java.security.AccessController.doPrivileged（Native Method） at java.security.ProtectionDomain $ 1.doIntersectionPrivilege（Unknown Source） at java.security.ProtectionDomain $ 1.doIntersectionPrivilege（Unknown Source）在java.awt.EventQueue $ 4.run（未知来源）在java.awt.EventQueue $ 4.run（未知来源） at java.security.AccessController.doPrivileged（Native Method） at java.security.ProtectionDomain $ 1.doIntersectionPrivilege（Unknown Source） at java.awt.EventQueue.dispatchEvent（Unknown Source） at java.awt.EventDispatchThread.pumpOneEventForFilters（Unknown Source） at java.awt.EventDispatchThread.pumpEventsForFilter（Unknown Source） at java.awt.EventDispatchThread.pumpEventsForHierarchy（Unknown Source） at java.awt.EventDispatchThread.pumpEvents（Unknown Source） at java.awt.EventDispatchThread.pumpEvents（Unknown Source）在java.awt.EventDispatchThread.run（未知来源）

public class GoogleDistanceMatrixConnection
{
String startLocation;
String endLocation;
final String urlString = "http://maps.googleapis.com/maps/api/distancematrix/xml?origins=" + startLocation +"&destinations=" + endLocation +"&language=en-EN&sensor=false&language=en-EN&units=imperial";


private static String XMLFile;

public String makeXMLFile(String start, String end) throws IOException
{
    startLocation = start;
    endLocation = end;
    URL url = new URL(urlString);
    URLConnection connection = url.openConnection();
    connection.connect();

    BufferedReader reader = new BufferedReader( new InputStreamReader(
            connection.getInputStream()));

    for(String line = reader.readLine(); line != null; line = 
            reader.readLine())
    {
        setXMLFile(line);
    }
    return getXMLFile();
}

public static String getXMLFile() {
    return XMLFile;
}
public static void setXMLFile(String xMLFile) {
    XMLFile = xMLFile;
}

public boolean doesPageExist() {
    if(XMLFile == null)
        return true;
    else    
        return false;
}
}

public class GoogleXMLParser {

private Document document;

@Before
public void setUp(String start, String end) throws ParserConfigurationException, SAXException,
        IOException {
    InputSource source = createInputSourceFromSampleXMLData(start, end);
    document = parseXMLFrom(source);
}

private InputSource createInputSourceFromSampleXMLData(String start, String end) {
    GoogleDistanceMatrixConnection googleConnection = new GoogleDistanceMatrixConnection();

    String xmlFile = "";
    try {
        xmlFile = googleConnection.makeXMLFile(start, end);
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    StringReader stringReader = new StringReader(xmlFile);
    return new InputSource(stringReader);
}

private Document parseXMLFrom(InputSource source)
        throws ParserConfigurationException, SAXException, IOException {
    DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
    DocumentBuilder documentBuilder = factory.newDocumentBuilder();
    return documentBuilder.parse(source);
}

public String retrieveDistance() throws ParserConfigurationException,
        SAXException, IOException {
    String distanceChildNodeName = document.getFirstChild().getChildNodes()
            .item(3).getFirstChild().getChildNodes().item(2)
            .getChildNodes().item(1).getFirstChild().getTextContent();
    return distanceChildNodeName;
}

public String retrieveDuration() throws ParserConfigurationException,
        SAXException, IOException {
    String durationChildNodeValue = document.getFirstChild()
            .getChildNodes().item(3).getFirstChild().getChildNodes()
            .item(1).getChildNodes().item(1).getFirstChild()
            .getTextContent();
    return durationChildNodeValue;
}
}

Answer 1

public String makeXMLFile(String start, String end) throws IOException
{
    startLocation = start;
    endLocation = end;
    URL url = new URL(urlString);
    URLConnection connection = url.openConnection();
    connection.connect();

    BufferedReader reader = new BufferedReader( new InputStreamReader(
            connection.getInputStream()));

    for(String line = reader.readLine(); line != null; line = 
            reader.readLine())
    {
        setXMLFile(line);
    }
    return getXMLFile();
}

public static String getXMLFile() {
    return XMLFile;
}
public static void setXMLFile(String xMLFile) {
    XMLFile = xMLFile;
}

你用每一行重写XMLFile - ＆gt;你得到的是最后一行而不是整个内容。您可以使用StringBuilder追加行。

根节点没有很好的形成错误

1 个答案: