PHP $ _POST爲空或爲空

Question

我拼命地試圖解決與我的Android應用程序的問題。我將一個列表提交給我的服務器，並將枚舉設置爲'標記'。 PHP頁面應該查看這個標籤，然後繼續執行相關的函數並作爲json數組或對象返回。這適用於應用程序的一個版本，但克隆版本無法獲取數據。 PHP只是直接跳過標記檢查isset標記並且標記不是空的條件，所以它必須完全看到一個空的POST或我提交的對象不符合我不知道的某些要求。

我查看了這麼多的帖子，搜索和搜索，但還沒有找到解決方案。它爲什麼會對一個版本的應用程序有效，但對於升級版本不起作用，它沒有對用於發送數據的方法進行任何更改？

所以這就是我正在處理的。首先，一個的AsyncTask需要的對象，並傳遞到處理一類的通信：

private class UpdateJobList extends AsyncTask<User, Void, Boolean> { 

    private List<Message> messages; 

    public UpdateJobList() { 
     super(); 
     messages = new ArrayList<Message>(); 
    } 

    @Override 
    protected Boolean doInBackground(User... params){   
     try { 
      CloudConnect cConn = new CloudConnect(sAddress); 
      this.messages = cConn.getAll(params[0]); 
      return true; 
     } catch (MalformedURLException e) { 
      e.printStackTrace(); 
     } catch (IOException e) { 
      e.printStackTrace(); 
     } 
     return false; 
    } 

    @Override 
    protected void onPostExecute(Boolean result) { 
     if (true) 
     { 
      handleMessageList(messages); 
     } 
    } 
} 

使用CloudConnect類來獲得單個JSON對象或對象的數組：

public class CloudConnect { 

private String site; 
private InputStream is; 
private Gson gson; 

public CloudConnect(String site) throws MalformedURLException { 
    this.site = site; 
    this.gson = new GsonBuilder().setDateFormat("yyyy-MM-dd").create(); 
    is = null; 
} 


public synchronized Message get(Message m) throws IOException { 
    Message msg = null; 
    HttpClient client = new DefaultHttpClient(); 
    HttpPost post = new HttpPost(this.site); 
    post.setEntity(new UrlEncodedFormEntity(validateMessage(m))); 

    HttpResponse response = client.execute(post); 
    StatusLine status = response.getStatusLine(); 

    if (status.getStatusCode() == 200) { 
     HttpEntity entity = response.getEntity(); 
     is = entity.getContent(); 
     try { 
      Reader read = new InputStreamReader(is); 
      String str = (String) gson.fromJson(read, Object.class); 
      JsonParser parser = new JsonParser(); 
      JsonElement jElem = parser.parse(str); 
      JsonObject jObject = (JsonObject) jElem; 

      msg = gson.fromJson(jObject, Message.class); 
      is.close(); 

     } catch (Exception e) { 
      e.printStackTrace(); 
     } 
    } 
    return msg; 
} 

public synchronized List<Message> getAll(Message m) throws IOException {  
    List<Message> mList = new ArrayList<Message>(); 
    HttpClient client = new DefaultHttpClient(); 
    HttpPost post = new HttpPost(this.site); 
    post.setEntity(new UrlEncodedFormEntity(validateMessage(m))); 

    HttpResponse response = client.execute(post); 
    StatusLine status = response.getStatusLine(); 

    if (status.getStatusCode() == 200) { 
     HttpEntity entity = response.getEntity(); 
     is = entity.getContent(); 
     try { 
      BufferedReader reader = new BufferedReader(new InputStreamReader(is)); 
      JsonArray jArray = null; 
      JsonReader jReader = new JsonReader(reader); 
      jReader.setLenient(true); 
      JsonParser parser = new JsonParser(); 
      if (parser.parse(jReader).isJsonArray()){ 
       jArray = parser.parse(jReader).getAsJsonArray(); 

       if (m instanceof User){ 
        for (JsonElement je : jArray) { 
         mList.add(gson.fromJson(je, Job.class)); 
         Log.d("json", je.toString()); 
        } 
       } else if (m instanceof Job) { 
        for (JsonElement je : jArray) { 
         mList.add(gson.fromJson(je, Update.class)); 
         Log.d("json", je.toString()); 
        } 
       } 
      } else { 
       JsonElement jElem = parser.parse(jReader); 
       JsonObject jObject = (JsonObject) jElem; 
       Error msg = null; 
       msg = gson.fromJson(jObject, Error.class); 
       mList.add(msg); 
      } 
      is.close(); 

     } catch (Exception e) { 
      e.printStackTrace(); 
     } 
    } 
    return mList; 
} 

而PHP代碼檢查標籤：

if (isset($_POST['messageType']) && $_POST['messageType'] != "") { 

$tag = $_POST['messageType']; 
// 
//various functions depending on messageType tag here. Such as getUser($email). 
//functions appear to work fine if the PHP doesn't find the initial conditions 
//false and skips them all. 
} else { 
$response["success"] = 0; 
    $response["error"]["errorMsg"] = "Tags are null"; 
    $response["error"]["messageType"] = $tag; 
      $response["error"]["varDump"] = var_dump($_POST); 

echo json_encode($response); 
} 

Answer 1

好吧，現在我明白了。你的Android代碼沒有問題，但在PHP中（我是因爲TAG Android而來到這裏的）。我不是PHP專家，但請記住isset ($ _POST ['messageType']) returns true only if the payload of your POST request contains something like: messageType=some_value.因此，您需要檢查您傳遞給post.setEntity(value)的值是否爲此格式的內容。

您可以使用像Fiddler這樣的工具來查看請求的有效負載並進行正確調試。