我是解析的新手,我试图通过YQL语句检索库存数据来测试它。每次运行程序时我都会收到错误的连接,而且我已经搜索过但没有找到任何解决方案。我从我的stringbuilder获得的链接是:
https://query.yahooapis.com/v1/public/yql?q=select%20 *%20from%20yahoo.finance.quote%20where%20symbol%20英寸%20 “MSFT” %2C “YHOO” %2C “AAPL” %2C “歌”)及诊断=真安培; ENV =商店%3A%2F%2Fdatatables.org%2Falltableswithkeys
我的打印报表的输出
System.out.println(responseCode);
System.out.println(HttpURLConnection.HTTP_OK);
分别为400,200。我没有得到任何实际错误,但我的程序只是在比较这两个值的if语句处终止。
import java.*;
import java.awt.List;
import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.util.ArrayList;
import javax.lang.model.element.Element;
import javax.swing.text.Document;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.soap.Node;
import org.omg.CORBA.portable.InputStream;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;
public class Testing
{
public static void main(String[] args)
{
ArrayList<String> stockTicker = new ArrayList<>();
stockTicker.add("MSFT");
stockTicker.add("YHOO");
stockTicker.add("AAPL");
stockTicker.add("GOOG");
String YahooURL = "https://query.yahooapis.com/v1/public/yql? q=select%20*%20from%20yahoo.finance.quote%20where%20symbol%20in%20";
for(int x=0; x < stockTicker.size()-1; x++)
{
YahooURL += "\""+stockTicker.get(x)+"\"%2C";
}
YahooURL += "\""+stockTicker.get(stockTicker.size()-1)+"\"";
YahooURL += ")&diagnostics=true&env=store%3A%2F%2Fdatatables.org%2Falltableswithkeys";
System.out.println(YahooURL);
try {
URL url = new URL(YahooURL); //Begin Connecting
URLConnection connection;
connection = url.openConnection();
HttpURLConnection httpConnection = (HttpURLConnection)connection;
int responseCode = httpConnection.getResponseCode();
// Tests if responseCode == 200 Good Connection
System.out.println(responseCode);
System.out.println(HttpURLConnection.HTTP_OK);
if (responseCode == HttpURLConnection.HTTP_OK) {
System.out.println("gets past response code");
java.io.InputStream in = httpConnection.getInputStream();
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder db = dbf.newDocumentBuilder();
org.w3c.dom.Document dom = db.parse(in);
org.w3c.dom.Element docEle = dom.getDocumentElement(); //End of Connecting
//begin parsing
NodeList quoteList = docEle.getElementsByTagName("results");
for (int i = 0 ; i < quoteList.getLength(); i++)
{
org.w3c.dom.Node q = quoteList.item(i);
if (quoteList != null && quoteList.getLength() > 0)
{
Element tickerID = (Element) q;
String tID = (String) ((DocumentBuilderFactory) tickerID).getAttribute("quote symbol");
NodeList infoList = ((org.w3c.dom.Node) tickerID).getChildNodes();
for(int j=0; j < infoList.getLength();j++)
{
Node qi = (Node) infoList.item(j);
if(qi.getNodeType()==Node.ELEMENT_NODE)
{
Element info = (Element) qi;
System.out.println("TickerID: " + q + ((org.w3c.dom.Element) qi).getTagName() + " = " + qi.getTextContent());
}
}
}
}
}
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (ParserConfigurationException e) {
e.printStackTrace();
} catch (SAXException e) {
e.printStackTrace();
}
finally {
}
}
}
答案 0 :(得分:0)
尝试替换以下行(请注意?
之后删除空格以及结束(
处的左括号):
String YahooURL = "https://query.yahooapis.com/v1/public/yql?q=select * from yahoo.finance.quote where symbol in (";
粘贴correct link into my browser后,我收到回复,同样适用于您的代码段。