Parsing JSON Object to Restful web service
Question
I am developing an android registration system that communicates with a mysql database through JSON. The restful web service was written with PHP and Slim library. i have tested the web service using Advanced Rest Client App by parsing a json payload data into it and it works perfectly fine with the result shown below. At the moment i am trying to parse user data from the android app to the server and it shows this error (Error parsing data org.json.JSONException: Value <html><head><title>Slim of type java.lang.String cannot be converted to JSONObject) . I would someone to tell me what i am doing wrong coz i feel the error is from my JSONParser class and Userfunction . Thanks in advance.
Here is my test result
{"tag":"signup","success":1,"error":0,"uid":"547d92b0480711.90973742",
"result":{"firstname":"mish","lastname":"harry","email":"mishael19@gmail.com"}}
Here is JSONParser
public class JSONParser2 {
static InputStream is = null;
static JSONObject jObj = null;
static String json = "";
// constructor
public JSONParser2() {
}
public JSONObject makeHttpRequest(String url, String method, List<NameValuePair> params){
try{
if(method.equals("POST")){
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"){
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;
}
}
here is my Userfunction
public class UserFunctions {
private JSONParser2 jsonParser2;
private static String signupURL = "http://globalpadtutorials.globalpad.info/loginSignup/v1/signup";
private static String signup_tag = "signup";
private static String postMethod = "POST";
public UserFunctions(){
jsonParser2 = new JSONParser2();
}
public JSONObject signupUser(String fname, String lname, String email, String pwd){
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("tag", signup_tag));
params.add(new BasicNameValuePair("firstname", fname));
params.add(new BasicNameValuePair("lastname", lname));
params.add(new BasicNameValuePair("email", email));
params.add(new BasicNameValuePair("password", pwd));
JSONObject json = jsonParser2.makeHttpRequest(signupURL, postMethod, params);
Log.e("JSON", json.toString());
return json;
}
}
Error stack
12-02 11:04:19.681: E/JSON Parser(10024): Error parsing data org.json.JSONException: Value <html>
<head><title>Slim of type java.lang.String cannot be converted to JSONObject
PHP code
function createUser(){
$request = \Slim\Slim::getInstance()->request();
$resp = \Slim\Slim::getInstance()->response();
$resp['Content-Type'] = 'application/json; charset=utf-8';
$body = $request->getBody();
$users = json_decode($body);
$dbhandler = new DbHandler();
$tag = $users->tag;
$fname = $users->firstname;
$lname = $users->lastname;
$email = $users->email;
$pwd = $users->password;
$response = array("tag" => $tag, "success" => 0, "error" => 0);
if($tag == 'signup') {
if ($dbhandler->userExisted($email)) {
$response["error"] = 2;
$response["error_msg"] = "User already existed";
echo json_encode($response);
} else {
$result = $dbhandler->addUser($fname, $lname, $email, $pwd);
if ($result != false) {
$response["success"] = 1;
var_dump($result);
$response["uid"] = $result["user_id"];
$response["result"]["firstname"] = $result["firstname"];
$response["result"]["lastname"] = $result["lastname"];
$response["result"]["email"] = $result["email"];
echo json_encode($response);
} else {
$response["error"] = 1;
$response["error_msg"] = "An error occured during sign up";
echo json_encode($response);
}
}
} else{
$response["error"] = 1;
$response["error_msg"] = "Invalid tag request: ".$tag;
echo json_encode($response);
}
}
html error
Slim Application Errorbody{margin:0;padding:30px;font:12px/1.5 Helvetica,Arial,Verdana,sans-serif;}h1{margin:0;font-size:48px;font-weight:normal;line-height:48px;}strong{display:inline-block;width:65px;}
Slim Application Error
The application could not run because of the following error:
Details
Type: ErrorException Code: 8 Message: Trying to get property of non-object File: /home/globa390/public_html/globalpadtutorials/loginSignup/v1/index.php Line: 63Trace
#0 /home/globa390/public_html/globalpadtutorials/loginSignup/v1/index.php(63): Slim\\Slim::handleErrors(8, 'Trying to get p...', '/home/globa390/...', 63, Array) \n12-02 11:55:50.366: E/JSON(27492): #1 [internal function]: createUser() \n12-02 11:55:50.366: E/JSON(27492): #2 /home/globa390/public_html/globalpadtutorials/loginSignup/library/Slim/Route.php(462): call_user_func_array('createUser', Array) \n12-02 11:55:50.366: E/JSON(27492): #3 /home/globa390/public_html/globalpadtutorials/loginSignup/library/Slim/Slim.php(1326): Slim\\Route->dispatch() \n12-02 11:55:50.366: E/JSON(27492): #4 /home/globa390/public_html/globalpadtutorials/loginSignup/library/Slim/Middleware/Flash.php(85): Slim\\Slim->call() \n12-02 11:55:50.366: E/JSON(27492): #5 /home/globa390/public_html/globalpadtutorials/loginSignup/library/Slim/Middleware/MethodOverride.php(92): Slim\\Middleware\\Flash->call() \n12-02 11:55:50.366: E/JSON(27492): #6 /home/globa390/public_html/globalpadtutorials/loginSignup/library/Slim/Middleware/PrettyExceptions.php(67): Slim\\Middleware\\MethodOverride->call() \n12-02 11:55:50.366: E/JSON(27492): #7 /home/globa390/public_html/globalpadtutorials/loginSignup/library/Slim/Slim.php(1271): Slim\\Middleware\\PrettyExceptions->call() \n12-02 11:55:50.366: E/JSON(27492): #8 /home/globa390/public_html/globalpadtutorials/loginSignup/v1/index.php(12): Slim\\Slim->run() \n12-02 11:55:50.366: E/JSON(27492): #9 {main}
3 answers
solution1
3 2014-12-02 12:17:44
public JSONObject signupUser(String fname, String lname, String email, String pwd){
List<NameValuePair> params = new ArrayList<NameValuePair>(5);
params.add(new BasicNameValuePair("tag", signup_tag));
params.add(new BasicNameValuePair("firstname", fname));
params.add(new BasicNameValuePair("lastname", lname));
params.add(new BasicNameValuePair("email", email));
params.add(new BasicNameValuePair("password", pwd));
String jsonstr = jsonParser2.makeHttpRequest(signupURL, postMethod, params);
//cast String into jsonobject
JSONObject json = new JSONObject(jsonStr);
return json;
}
solution2
1 2014-12-02 11:44:10
Your url returns html page with 404 error. That's why you cant parse it as json.
solution3
1 2014-12-02 11:48:32
I also had the same issue. Ask your Server admin for the permissions for using the database for both web and mobile. After that paste your php files in public_html.
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