我正在製作一個應用程序,用於在數據庫中存儲一些數據,然後檢索它。 在服務器端,我正在使用PHP,而在客戶端,我有這個文件獲取輸入並將其傳遞給PHP文件。從服務器接收響應錯誤?
new AsyncTask<String, String, String>() {
JSONParser jsonParser = new JSONParser();
private ProgressBar pBar;
private String url_post_pet = "http://192.168.0.13/Android/post_pet.php";
// JSON Node names
private static final String TAG_SUCCESS = "success";
/**
* Before starting background thread Show Progress Dialog
*/
@Override
protected void onPreExecute() {
super.onPreExecute();
//pBar = new ProgressBar();
//pBar.setIndeterminate(false);
//pBar.setVisibility(View.VISIBLE);
}
@Override
protected String doInBackground(String... args) {
// Building Parameters
HashMap<String, String> params = new HashMap<>();
params.put("name", a);
params.put("breed", BREED);
params.put("type", TYPE);
params.put("images", "Whatever");
params.put("description", c);
params.put("coords", b);
// getting JSON Object
// Note that create product url accepts POST method
JSONObject json = jsonParser.makeHttpRequest(url_post_pet,
"POST", params);
// check log cat for response
Log.d("Create Response", json.toString());
// check for success tag
try {
int success = json.getInt(TAG_SUCCESS);
if (success == 1) {
// successfully created product
Intent i = new Intent(getApplicationContext(), MainActivity.class);
startActivity(i);
// closing this screen
finish();
} else {
// failed to create product
}
} catch (JSONException e) {
System.out.println("exception" + e);
e.printStackTrace();
}
System.out.println("nul");
return null;
}
/**
* After completing background task Dismiss the progress dialog
**/
protected void onPostExecute(String file_url) {
// dismiss the dialog once done
//pBar.dismiss();
}
}.execute();
}
});
}
而且,我這有JSONParser:
public class JSONParser {
String charset = "UTF-8";
HttpURLConnection conn;
DataOutputStream wr;
StringBuilder result;
URL urlObj;
JSONObject jObj = null;
StringBuilder sbParams;
String paramsString;
public JSONObject makeHttpRequest(String url, String method,
HashMap<String, String> params) {
sbParams = new StringBuilder();
int i = 0;
for (String key : params.keySet()) {
try {
if (i != 0){
sbParams.append("&");
}
sbParams.append(key).append("=")
.append(URLEncoder.encode(params.get(key), charset));
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
i++;
}
if (method.equals("POST")) {
// request method is POST
try {
urlObj = new URL(url);
conn = (HttpURLConnection) urlObj.openConnection();
conn.setDoOutput(true);
conn.setRequestMethod("POST");
conn.setRequestProperty("Accept-Charset", charset);
conn.setReadTimeout(10000);
conn.setConnectTimeout(15000);
conn.connect();
paramsString = sbParams.toString();
wr = new DataOutputStream(conn.getOutputStream());
wr.writeBytes(paramsString);
wr.flush();
wr.close();
} catch (IOException e) {
e.printStackTrace();
}
}
else if(method.equals("GET")){
// request method is GET
if (sbParams.length() != 0) {
url += "?" + sbParams.toString();
}
try {
urlObj = new URL(url);
conn = (HttpURLConnection) urlObj.openConnection();
conn.setDoOutput(false);
conn.setRequestMethod("GET");
conn.setRequestProperty("Accept-Charset", charset);
conn.setConnectTimeout(15000);
conn.connect();
} catch (IOException e) {
e.printStackTrace();
}
}
try {
//Receive the response from the server
InputStream in = new BufferedInputStream(conn.getInputStream());
BufferedReader reader = new BufferedReader(new InputStreamReader(in));
result = new StringBuilder();
String line;
while ((line = reader.readLine()) != null) {
result.append(line);
}
Log.d("JSON Parser", "result: " + result.toString());
} catch (IOException e) {
e.printStackTrace();
}
conn.disconnect();
// try parse the string to a JSON object
try {
System.out.println(jObj);
jObj = new JSONObject(result.toString());
} catch (JSONException e) {
Log.e("JSON Parser", "Error parsing data " + e.toString());
}
// return JSON Object
return jObj;
}
這是錯誤我得到我每次提交數據:
08-26 12:51: 08/2365089-5156/chtecnologies.myapplication D/JSON解析器:result:08-26 12:51:08.239 5089-5156/chtecnologies.myapplication E/JSON解析器:解析數據時出錯org.json.JSONException:字符0處的輸入結束 08-26 12:51:08.793 5089-5096/chtecnologie s.myapplication W/art:暫停所有線程花費:190.496ms 08-26 12:51:09.245 5089-5096/chtecnologies.myapplication W/art:暫停所有線程花費:137.277ms 08-26 12:51:09.267 5089-5156/chtecnologies.myapplication E/AndroidRuntime:致命異常:AsyncTask#1 進程:chtecnologies.myapplication,PID:5089 java.lang.RuntimeException:執行doInBackground()時發生錯誤() at android.os.AsyncTask $ 3 .done(AsyncTask.java:304) 在java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355) 在java.util.concurrent.FutureTask.setException(FutureTask.java:222) 在java.util中.concurrent.FutureTask.ru n(FutureTask.java:242) at android.os.AsyncTask $ SerialExecutor $ 1.run(AsyncTask.java:231) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112) at java.util .concurrent.ThreadPoolExecutor $ Worker.run(ThreadPoolExecutor.java:587) at java.lang.Thread.run(Thread.java:818) 引起:java.lang.NullPointerException:試圖調用虛擬方法java.lang .String org.json.JSONObject.toString()'空對象引用 at chtecnologies.myapplication.PostPet $ 4 $ 1.doInBackground(PostPet.java:154) at chtecnologies.myapplication.PostPet $ 4 $ 1.doInBackground(PostPet.java :118) at android.os.AsyncTask $ 2.call(AsyncTask.java:292) at java.util.concurrent.FutureTask.run(FutureTask.java:237) at android.os.AsyncTask $ SerialExecutor $ 1.run(AsyncTask.java :231) 在java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112) 在java.util.concurrent.ThreadPoolExecutor中$ Worker.run(ThreadPoolExecutor.java:587) 在java.lang.Thread.run (Thread.java:818)
數據成功進入數據庫,但似乎JSONParser中存在問題,比不能得到PHP文件的結果。
你能告訴我JSONParser文件或其他地方有什麼問題嗎?這是我第一次在我的應用中實現服務器,我希望你能幫助我!謝謝