Android HttpURLConnection set GET請求方法

Question

我想用GET方法發送HTTP請求，但我無法設置GET方法。 這裏是我的代碼：

try { 
       URL url = new URL(path); 
       conn = (HttpURLConnection) url.openConnection(); 

       conn.setReadTimeout(10000); 
       conn.setConnectTimeout(15000); 
       conn.setRequestMethod("GET"); 
       conn.setDoInput(true); 
       conn.setDoOutput(true); 
Uri.Builder builder = new Uri.Builder() 
         .appendQueryParameter("p1", "123") 
         .appendQueryParameter("p2", "123"); 
       String query = builder.build().getEncodedQuery(); 
       OutputStream os = conn.getOutputStream(); 
       BufferedWriter writer = new BufferedWriter(
         new OutputStreamWriter(os, "UTF-8")); 
       writer.write(query); 
       writer.flush(); 
       writer.close(); 
       os.close(); 

       conn.connect(); 
       Log.e("ERROR", conn.getResponseMessage()); 
       Log.e("ERROR", conn.getRequestMethod()); 
       Log.e("ERROR", String.valueOf(conn.getResponseCode())); 

      } catch (Exception e) { 
       Log.e("ERROR", e.getMessage()); 
      } 

在代碼中，我設置GET方法，但在日誌中，請求方法是POST：

02-01 16:48:54.766 23799-23831/? E/ERROR﹕ Method Not Allowed 
02-01 16:48:54.766 23799-23831/? E/ERROR﹕ POST 
02-01 16:48:54.766 23799-23831/? E/ERROR﹕ 405 

什麼是問題？

Answer 1

問題是

conn.setDoOutput(true); 

設置爲true時請求方法變更爲POST，因爲GET或DELETE不能有一個請求主體