Question

我正在java中创建一个应用程序，我需要获取csv文件中列出的某些位置的纬度和经度。一切都很顺利，但一段时间后响应就会停止。有时它会解析整套位置，有时会在两者之间停止。我无法抓住这个漏洞，请帮助我。代码写在下面

 `int count=0;
 JFileChooser  jfc;
String path_of_chosen_file;
File directory_of_chosen_file;
ArrayList<String> locations;
FileWriter writer = null;

 private void browseBtnActionPerformed(java.awt.event.ActionEvent evt) {                                          


    jfc = new JFileChooser();
    if(jfc.showOpenDialog(this) == JFileChooser.APPROVE_OPTION) {
        //code to handle choosed file here.
        jfilenametxt.setText(jfc.getName(jfc.getSelectedFile()));
        path_of_chosen_file = jfc.getSelectedFile().getAbsolutePath();
        directory_of_chosen_file=jfc.getCurrentDirectory();
        System.out.println(path_of_chosen_file);
    }
}    
   private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {                                         
    // TODO add your handling code here:

    FileInputStream fileIn = null;
    locations=new ArrayList();

    Scanner scanner = null;
    try {

        scanner = new Scanner(new File(path_of_chosen_file));
        scanner.useDelimiter(",");
        while(scanner.hasNextLine())
        {
            locations.add(scanner.nextLine());             
        }
        locations.removeAll(Arrays.asList("", null));  
 }
    catch(FileNotFoundException e1){
    }

      String writepath=directory_of_chosen_file.toString() 
    +"/newfile"+jfc.getName(jfc.getSelectedFile());


   FileWriter writer = null;

 try {

 writer = new FileWriter(writepath);
     try{
         Iterator itr=locations.iterator(); 
         while(itr.hasNext())
         {

             String pointLocation=(String) itr.next();
             System.out.println(pointLocation);
        String latLongs[] = getLatLongPositions( pointLocation);



        writer.append(pointLocation);
        writer.append(',');
        writer.append(latLongs[0]);
        writer.append(',');
        writer.append(latLongs[1]);
           writer.append('\n');
            writer.flush();


        System.out.println("Your excel file has been generated for " + pointLocation);
         }
         Object[] options = { "OK" };
 int input = JOptionPane.showOptionDialog(null, "Excel generation is 
  completed. Click OK to continue", "",
   JOptionPane.DEFAULT_OPTION, JOptionPane.WARNING_MESSAGE,
   null, options, options[0]);
          if(input == JOptionPane.OK_OPTION)
            {
                 System.out.println("AASHIMA");
            }
     }

     catch(Exception e1){
                  }

    } catch (IOException e) {
    e.printStackTrace();
    } finally {
     try {
     writer.flush();
     writer.close();
     } catch (IOException e) {
    e.printStackTrace();
 }
    }
   } 

 `

public static String[] getLatLongPositions(String address) throws Exception
   {
  int responseCode = 0;
  String api = "http://maps.googleapis.com/maps/api/geocode/xml?address=" + 
  URLEncoder.encode(address, "UTF-8") + "&sensor=true";
System.out.println("URL : "+api);
URL url = new URL(api);
HttpURLConnection httpConnection = (HttpURLConnection)url.openConnection();

httpConnection.connect();

responseCode = httpConnection.getResponseCode();

if(responseCode == 200)
{
  DocumentBuilder builder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
  Document document = builder.parse(httpConnection.getInputStream());
  XPathFactory xPathfactory = XPathFactory.newInstance();
  XPath xpath = xPathfactory.newXPath();
  XPathExpression expr = xpath.compile("/GeocodeResponse/status");
  String status = (String)expr.evaluate(document, XPathConstants.STRING);
  if(status.equals("OK"))
  {
     expr = xpath.compile("//geometry/location/lat");
     String latitude = (String)expr.evaluate(document, XPathConstants.STRING);
     expr = xpath.compile("//geometry/location/lng");
     String longitude = (String)expr.evaluate(document, XPathConstants.STRING);


     return new String[] {latitude, longitude};
  }
  else
  {
     throw new Exception("Error from the API - response status: "+status);
  }
}

return null;
}

这里停止并且没有进展。此外，控件返回到UI，按钮再次达到未按下状态。

它完全随机执行。这是截图

响应代码是200，我仍面临同样的问题

我发现了问题，请建议一个解决方案，以便我能得到理想的结果

Answer 1

我已经解决了这个问题。问题是由于OVER_QUERY_LIMIT，所以我检查了它的状态，并在一些超时后递归调用该函数。这是代码。

    public static String[] getLatLongPositions(String address) throws Exception
 {
  int responseCode = 0;
  String api = "http://maps.googleapis.com/maps/api/geocode/xml?address=" + 
 URLEncoder.encode(address, "UTF-8") + "&sensor=true";
System.out.println("URL : "+api);
URL url = new URL(api);
HttpURLConnection httpConnection = (HttpURLConnection)url.openConnection();

httpConnection.connect();

responseCode = httpConnection.getResponseCode();
System.out.println("The response code is: " +responseCode);

if(responseCode == 200)
{

  DocumentBuilder builder = DocumentBuilderFactory.newInstance().newDocumentBuilder();

  Document document = builder.parse(httpConnection.getInputStream());

  XPathFactory xPathfactory = XPathFactory.newInstance();
  XPath xpath = xPathfactory.newXPath();
  XPathExpression expr = xpath.compile("/GeocodeResponse/status");

  String status = (String)expr.evaluate(document, XPathConstants.STRING);

  System.out.println("the status is " +status);
  if(status.equals("OK"))
  {

     expr = xpath.compile("//geometry/location/lat");
     String latitude = (String)expr.evaluate(document, XPathConstants.STRING);
     expr = xpath.compile("//geometry/location/lng");
     String longitude = (String)expr.evaluate(document, XPathConstants.STRING);


     return new String[] {latitude, longitude};
  }
  if (status.equals("OVER_QUERY_LIMIT")) {    
       TimeUnit.SECONDS.sleep(20);
           return( getLatLongPositions(address));


    }
  else
  {
     throw new Exception("Error from the API - response status: "+status);
  }
}

return null;
}`

API的输出会自动停止

1 个答案: