在java中获取google的搜索结果

我在此程序中收到403响应代码，但我需要获得200才能取回搜索结果，我该怎么办？

I got 403 response code in this program, but I need to get 200 to getting back the search result, what can I do?

      String url="http://www.google.com/search?q=";
      String charset="UTF-8";
      String key="java";
      String query = String.format("%s",URLEncoder.encode(key, charset));
      URLConnection con = new URL(url+ query).openConnection();
      BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()));
      String inputLine;
      while ((inputLine = in.readLine()) != null) 
      System.out.println(inputLine);
      in.close();