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| 使用URL类( GetURL.java ) |
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import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.MalformedURLException;
import java.net.URL;
/**
* Chapter 2 Example
*
* This program uses the standard Java URL class to open a connection to a web
* page and download the contents.
*
* @author Jeff Heaton
* @version 1.0
*/
public class GetURL {
/**
* This method will display the URL specified by the parameter.
*
* @param u
* The URL to display.
*/
static protected void getURL(String u) {
URL url;
InputStream is;
InputStreamReader isr;
BufferedReader r;
String str;
try {
System.out.println("Reading URL: " + u);
url = new URL(u);
is = url.openStream();
isr = new InputStreamReader(is);
r = new BufferedReader(isr);
do {
str = r.readLine();
if (str != null)
System.out.println(str);
} while (str != null);
} catch (MalformedURLException e) {
System.out.println("Must enter a valid URL");
} catch (IOException e) {
System.out.println("Can not connect");
}
}
/**
* Program entry point.
*
* @param args
* Command line arguments. Specified the URL to download.
*/
static public void main(String args[]) {
if (args.length < 1)
System.out.println("Usage: GetURL ");
else
getURL(args[0]);
}
}
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