qiulin.java~5~

本程序用JAVA编制

import java.util.*;
import java.io.*;
import java.sql.Timestamp;
import org.w3c.dom.*;

public class Qiulin {

  private static final String source =
  "http://stock.sina.com.cn/cgi-bin/stock/quote/quote.cgi?symbol=600891&country=sh";
  private static final String xslFile = "new-xml/600891.xsl";
  private static final String xmlFile = "new-xml/600891-result.xml";

  public Qiulin(){
  //public static void main(String args[]) {
    try {
      // Retrieve the source document as XML
      Document xhtml = StockHelper.tidyHTML(source);
      // Parse the XSL document
      Document xsl   = StockHelper.parseXMLFromFile(xslFile);
      // Get the current data by applying the XSL transform
      Document data  = StockHelper.transformXML(xhtml, xsl);
      // For convenience, add a timestamp to what we have done

      Date now = new Date();
      Timestamp time = new Timestamp(now.getTime());
      Element root = data.getDocumentElement();
      NodeList nl = root.getElementsByTagName("stock");
      Element stock = (Element)nl.item(0);

      for(int i=0;i<stock.getChildNodes().getLength();i++){
        String value=stock.getChildNodes().item(i).getChildNodes().item(0).getNodeValue();
        stock.getChildNodes().item(i).getChildNodes().item(0).setNodeValue(value.trim());
      }
      String newtime=stock.getChildNodes().item(0).getChildNodes().item(0).getNodeValue();
      System.out.println("new time="+newtime);

      //Write the output file, merging if necessary
      File dataFile  = new File(xmlFile);
      if (dataFile.exists()) {
         //If we have extracted before, merge the data and write the file
        Document oldData = StockHelper.parseXMLFromFile(dataFile);
        StockHelper.mergeXML(oldData.getDocumentElement(), stock, false);
        StockHelper.outputXMLToFile(oldData, xmlFile);

        Element oldroot = oldData.getDocumentElement();
        NodeList oldnl = oldroot.getElementsByTagName("stock");
        Element oldstock = (Element)oldnl.item(0);


        //String firsttime=oldstock.getElementsByTagName("time").item(0).getChildNodes().item(0).getNodeValue();
        //System.out.println("first time="+firsttime);

        int len=oldroot.getChildNodes().getLength();
        String lasttime=oldroot.getChildNodes().item(len-2).getChildNodes().item(1).getChildNodes().item(0).getNodeValue();
        System.out.println("last time="+lasttime);

        if(newtime.equals(lasttime)){
          System.out.println("do nothing !");
        }
        else{
          StockHelper.mergeXML(oldData.getDocumentElement(), stock, false);
          StockHelper.outputXMLToFile(oldData, xmlFile);
        }

        //System.out.print(stock.getChildNodes().item(0).getChildNodes().item(0).getNodeValue());
      } else {
        // If this is our first extraction, just write the file
        StockHelper.outputXMLToFile(data, xmlFile);
      }

    } catch (XMLHelperException xmlhe) {
      System.err.println(
          "There was an error in the extraction process:\n" + xmlhe.getMessage());
    }
  }
}