Heres a sample that you can use to create your own :/
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import java.io.*;
import java.net.*;
import java.text.*;
public class Webcat {
public String GetString(String urlString, String preString, String postString)
{
// Get the web page from the url defined by urlString
String webPageHTML;
String DesiredString;
try {
webPageHTML = GetWebPageFromUrl(urlString);
DesiredString = GetStringFromHTML(webPageHTML, preString, postString);
}
catch (GetStringException e)
{
return "0";
}
catch (Exception e1)
{
// Catch any other exception that might occur
return "0";
}
return DesiredString;
}
//====================================================================
// Worker methods -- these can be private
//====================================================================
//====================================================================
// GetWebPageFromUrl()
//====================================================================
private String GetWebPageFromUrl(String urlString) throws GetStringException
{
// Create a URL object from urlString
URL PageURL;
try {
PageURL = new URL(urlString);
}
catch (MalformedURLException e)
{
String msg = "Invalid url: " + urlString;
throw new GetStringException(msg);
}
// Open a connection to the URL
URLConnection PageConnection;
try {
PageConnection = PageURL.openConnection();
}
catch (IOException e)
{
String msg = "Can't open connection to " + urlString;
throw new GetStringException(msg);
}
// Get the InputStream from the URL connection
InputStream webPageInputStream;
try {
webPageInputStream = PageConnection.getInputStream();
}
catch (IOException e)
{
// Could be any server error, but the most likely is 404
String msg = "404 File Not Found: " + urlString;
throw new GetStringException(msg);
}
// Read the web page via the InputStream
StringBuffer webPageData = new StringBuffer(32000);
int totalBytesRead = 0;
boolean moreToRead = true;
byte[] readBuf = new byte[4096]; // Read the web page in 4K chunks
while (moreToRead)
{
int numBytesRead = 0;
try {
numBytesRead = webPageInputStream.read(readBuf);
}
catch (IOException e)
{
moreToRead = false;
numBytesRead = -1;
}
if (numBytesRead > 0)
{
totalBytesRead += numBytesRead;
webPageData.append(new String(readBuf, 0, numBytesRead));
}
else
moreToRead = false;
}
try {
webPageInputStream.close();
}
catch (IOException e)
{
// Ignore any exception that might occur
}
webPageData.setLength(totalBytesRead);
return webPageData.toString();
}
//====================================================================
// GetStringFromHTML()
//====================================================================
private String GetStringFromHTML(String webPageHTML, String preString, String postString) throws GetStringException
{
// Look for the preString
int preStringLoc = webPageHTML.indexOf(preString);
if (preStringLoc == -1)
{
String msg = "Couldn't find the preString " + preString;
throw new GetStringException(msg);
}
// Found the preString, so look for the postString
int postStringLoc = webPageHTML.indexOf(postString, preStringLoc);
if (postStringLoc == -1)
{
String msg = "Couldn't find the postString " + postString;
throw new GetStringException(msg);
}
// The stock price is between the preString and postString
String DesiredString = webPageHTML.substring(preStringLoc + preString.length(), postStringLoc);
return DesiredString;
}
}
//====================================================================
//
// class GetStringException
//
// Convenience class to make it easy to return errors from our
// worker methods. This let's us separate StockGrabber errors
// from coding errors (what, coding errors?!).
//
//====================================================================
class GetStringException extends Exception
{
public GetStringException (String msg)
{
super(msg);
}
}
