java访问网页

package au.com.test;
 
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
 
public class Test {
  public static void main(Strings[] args) {
    URL url;
    HttpURLConnection urlConnection;
    try {
      url = new URL("url1");
      urlConnection = (HttpURLConnection) url.openConnection();
      String string = urlConnection.getHeaderField("Set-Cookie");
      String[] sessionId = string.split(";");
      url = new URL("url12");
      urlConnection = (HttpURLConnection) url.openConnection();
      urlConnection.setRequestProperty("Cookie", sessionId[0]);
      urlConnection.setDoOutput(true);
      urlConnection.setRequestMethod("POST");
      OutputStream os = urlConnection.getOutputStream();
      os.write("username=zhangsan&password=1245".getBytes());
      BufferedReader reader = new BufferedReader(new InputStreamReader(urlConnection.getInputStream()));
      String line;
      while ((line = reader.readLine()) != null) {
        System.out.println(line);
      }
    } catch (MalformedURLException e) {
      e.printStackTrace();
    } catch (IOException e) {
      e.printStackTrace();
    }
  }
}