my_url ="http://○○/servlet/dbapp"
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(my_url);

//パラメータ作成
//（http://○○/servlet/dbapp?Ap="0"&SQL="SELECT * FROM table_name ORDER BY code"）
List<NameValuePair> post_params = new ArrayList<NameValuePair>();
post_params.add(new BasicNameValuePair("Ap", "0"));
post_params.add(new BasicNameValuePair("SQL", "SELECT * FROM table_name ORDER BY code"));
httppost.setEntity(new UrlEncodedFormEntity(post_params, "UTF-8"));

try{
response = httpclient.execute(httppost);　←予期せず停止しました。
}
…

execute部でメッセージが表示されます。