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當我試圖通過PHP更新分數到MYSQL時，我在LogCat中出現錯誤。 給出的錯誤： 「解析數據org.json.JSONException時出錯：值<類型java.lang.String的表單不能轉換爲JSONObject」。 我很新的這個，所以我不知道如何解決這個問題？解析JSON數據時出錯，org.json.jsonexception，java.lang.String無法轉換
這裏是我的代碼：
int scoreEL;
String username;
if(DifficultyMenu.scoreEL1 < scoreEL1){
new UpdateScores().execute();
}
class UpdateScores extends AsyncTask<String, String, String> {
@Override
protected String doInBackground(String... args) {
// TODO Auto-generated method stub
int success;
try {
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("username", username));
params.add(new BasicNameValuePair("stars", String.valueOf(scoreEL1)));
Log.d("request!", "starting");
JSONObject json = jsonParser.makeHttpRequest(
LOGIN_URL_1, "POST", params);
Log.d("Login attempt", json.toString());
success = json.getInt(TAG_SUCCESS);
if (success == 1) {
Log.d("Updated successful!", json.getString(TAG_MESSAGE));
finish();
return json.getString(TAG_MESSAGE);
}else{
Log.d("Login Failure!", json.getString(TAG_MESSAGE));
return json.getString(TAG_MESSAGE);
}
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
：
更新比分的Android代碼JSONParser類：
public class JSONParser {
static InputStream is = null;
static JSONObject jObj = null;
static String json = "";
// constructor
public JSONParser() {
}
public JSONObject getJSONFromUrl(final String url) {
// Making HTTP request
try {
// Construct the client and the HTTP request.
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(url);
// Execute the POST request and store the response locally.
HttpResponse httpResponse = httpClient.execute(httpPost);
// Extract data from the response.
HttpEntity httpEntity = httpResponse.getEntity();
// Open an inputStream with the data content.
is = httpEntity.getContent();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
try {
// Create a BufferedReader to parse through the inputStream.
BufferedReader reader = new BufferedReader(new InputStreamReader(
is, "iso-8859-1"), 8);
// Declare a string builder to help with the parsing.
StringBuilder sb = new StringBuilder();
// Declare a string to store the JSON object data in string form.
String line = null;
// Build the string until null.
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
// Close the input stream.
is.close();
// Convert the string builder data to an actual string.
json = sb.toString();
} catch (Exception e) {
Log.e("Buffer Error", "Error converting result " + e.toString());
}
// Try to parse the string to a JSON object
try {
jObj = new JSONObject(json);
} catch (JSONException e) {
Log.e("JSON Parser", "Error parsing data " + e.toString());
}
// Return the JSON Object.
return jObj;
}
// function get json from url
// by making HTTP POST or GET mehtod
public JSONObject makeHttpRequest(String url, String method,
List<NameValuePair> params) {
// Making HTTP request
try {
// check for request method
if(method == "POST"){
// request method is POST
// defaultHttpClient
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(url);
httpPost.setEntity(new UrlEncodedFormEntity(params));
HttpResponse httpResponse = httpClient.execute(httpPost);
HttpEntity httpEntity = httpResponse.getEntity();
is = httpEntity.getContent();
}else if(method == "GET"){
// request method is GET
DefaultHttpClient httpClient = new DefaultHttpClient();
String paramString = URLEncodedUtils.format(params, "utf-8");
url += "?" + paramString;
HttpGet httpGet = new HttpGet(url);
HttpResponse httpResponse = httpClient.execute(httpGet);
HttpEntity httpEntity = httpResponse.getEntity();
is = httpEntity.getContent();
}
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
try {
BufferedReader reader = new BufferedReader(new InputStreamReader(
is, "iso-8859-1"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
is.close();
json = sb.toString();
} catch (Exception e) {
Log.e("Buffer Error", "Error converting result " + e.toString());
}
// try parse the string to a JSON object
try {
jObj = new JSONObject(json);
} catch (JSONException e) {
Log.e("JSON Parser", "Error parsing data " + e.toString());
}
// return JSON String
return jObj;
}
}
PHPcode：
<?php
if($_POST['submit']){
$stars= $_POST['stars'];
$username = $_POST['username'];
$connect = mysql_connect("*****", "****", "*****") or die("Can't connect to database!");
mysql_select_db("a9698368_webserv") or die("Can't select database!");
try{
$checkUsername = mysql_query("SELECT username FROM users WHERE username = '$username'");
$checkuser = mysql_fetch_assoc($checkUsername);
if($username == $checkuser){
$response["success"] = 0;
$response["message"] = "User doesn't exist!";
die(json_encode($response));
}
}
catch (PDOException $ex) {
$response["success"] = 0;
$response["message"] = "Database Error. Please Try Again!";
die(json_encode($response));
}
try{
mysql_query("
UPDATE users SET easy_level1 = '$stars' WHERE username = '$username'
");
}
catch (PDOException $ex) {
$response["success"] = 0;
$response["message"] = "Database Error. Please Try Again!";
die(json_encode($response));
}
try{
$check = mysql_query("
SELECT easy_level1 FROM users WHERE username = '$username'
");
}
catch (PDOException $ex) {
$response["success"] = 0;
$response["message"] = "Can't check if the new score is successfully updated!";
die(json_encode($response));
}
if($check !== $stars){
$updated = true;
}
if ($updated) {
$response["success"] = 1;
$response["message"] = "Updated successful!";
die(json_encode($response));
} else {
$response["success"] = 0;
$response["message"] = "Can't update the stars!";
die(json_encode($response));
}
mysql_close();
}
else{
echo"
<form action='updateEL1.php' method='POST'>
Username: <input type='text' name='username'><br>
Stars: <input type='text' name='stars'><br>
<input type='submit' name='submit' value='Update'>
</form>
";
}
?>
有人可以幫我嗎？
在此先感謝！
粘貼您的堆棧跟蹤和你的JSON太 – bhargavg 2014-09-02 18:14:10
，另外，儘量用別針把它降低到一個更短的一段代碼。我非常懷疑你需要250行來證明這個問題。 – 2014-09-02 18:16:10