もっと具体的にお願いします。何がうまくいかないのですか?このコードは、HTTP GET 要求を行うために使用できるものです。
HttpClient httpClient = new DefaultHttpClient();  
String url = "http://www.mywebsite.com/script.php";
HttpGet httpGet = new HttpGet(url);
try {
    HttpResponse response = httpClient.execute(httpGet);
    StatusLine statusLine = response.getStatusLine();
    if (statusLine.getStatusCode() == HttpStatus.SC_OK) {
        HttpEntity entity = response.getEntity();
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        entity.writeTo(out);
        out.close();
        String responseStr = out.toString();
        // do something with response 
    } else {
        // handle bad response
    }
} catch (ClientProtocolException e) {
    // handle exception
} catch (IOException e) {
    // handle exception
}