获取一个url的内容.

WebPageReader.java

package sdkongkong;
   import java.net.URL;
   import java.net.MalformedURLException;
   import java.net.URLConnection;
   import java.io.IOException;
   import java.io.BufferedReader;
   import java.io.InputStreamReader;

   public class WebPageReader {

      private static URLConnection connection;

      private static void connect( String urlString ) {
        try {
          URL url = new URL(urlString);
          connection = url.openConnection();
          System.out.println(connection.getClass());
        } catch (MalformedURLException e){
          e.printStackTrace();
        } catch (IOException e) {
          e.printStackTrace();
        }
      }

      private static void readContents() {
        BufferedReader in = null;
        try {
          in = new BufferedReader(
            new InputStreamReader(
              connection.getInputStream()));

          String inputLine;
          while (
            (inputLine = in.readLine()) != null) {
            System.out.println(inputLine);
          }
        } catch (IOException e) {
          e.printStackTrace();
        }
      }

      public static void main(String[] args) {
        if (args.length != 1) {
          System.err.println("usage: java WebPageReader " + "<url>");
          System.exit(0);
        }
        connect(args[0]);
        readContents();
      }
   }

使用方法,java WebPageReader + url(http://www.sina.com)