Retrofit Post Request Error – java.lang.IllegalStateException: Expected BEGIN_OBJECT but was STRING at line 1 column 1 path $

huangapple
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英文:

Retrofit Post Request Error - java.lang.IllegalStateException: Expected BEGIN_OBJECT but was STRING at line 1 column 1 path $

问题

我正在尝试使用 Retrofit、MVVM、Coroutines 和 Hilt 发送一个 POST 请求。

在发送 POST 请求后，我得到了以下错误：

java.lang.IllegalStateException: 预期的是对象（BEGIN_OBJECT），但在第 1 行第 1 列找到了字符串（STRING），路径为 $

（我已经搜索过了，但没有找到有帮助的解决方法）

AppModule

  1. @Provides
  2. @Singleton
  3. fun provideRetrofit(gson: Gson): Retrofit = Retrofit.Builder()
  4.     .baseUrl(EndPoints.BASE_URL)
  5.     .client(
  6.         OkHttpClient.Builder().apply {
  7.             if (BuildConfig.DEBUG) {
  8.                 val logging = HttpLoggingInterceptor()
  9.                 logging.level = HttpLoggingInterceptor.Level.BODY
  10.                 addInterceptor(logging)
  11.             }
  12.         }.build()
  13.     )
  14.     .addConverterFactory(ScalarsConverterFactory.create())
  15.     .addConverterFactory(GsonConverterFactory.create(gson))
  16.     .build()
  18. @Provides
  19. @Singleton
  20. fun provideApiService(retrofit: Retrofit) = retrofit.create(ApiService::class.java)

ApiService

  1. @POST(EndPoints.REGISTER_WITH_EMAIL)
  2. suspend fun registerUserWithEmail(@Body newUser: NewUser): Response<JsonResponse>

ApiDataSource

  1. suspend fun createNewUserEmail(newUser: NewUser) = apiService.registerUserWithEmail(newUser)

NewUser

  1. data class NewUser(
  2.     @SerializedName("username") val userName: String?,
  3.     @SerializedName("password") val password: String?,
  4.     @SerializedName("email") val email: String?,
  5.     @SerializedName("birthday") val birthday: String?,
  6.     @SerializedName("birth_year") val birthYear: String?,
  7.     @SerializedName("fullname") val fullname: String?,
  8.     @SerializedName("gender") val gender: String?
  9. )

RegisterRepo

  1. suspend fun saveUserWithEmail(newUser: NewUser) = safeApiCall {
  2.     apiDataSource.createNewUserEmail(newUser)
  3. }

RegisterViewModel

  1. // SaveUserDetails
  2. private val _saveDetailsEmail = MutableLiveData<Resource<JsonResponse>>()
  4. fun doRegisterUserEmail(newUser: NewUser) = viewModelScope.launch {
  5.     try {
  6.         _saveDetailsEmail.value = registerRepo.saveUserWithEmail(newUser)
  7.     } catch (exception: Exception) {
  8.         // Handle exception
  9.     }
  10. }

JsonResponse

  1. data class JsonResponse(val success: String, val message: String)

RegisterFragment

  1. val userDetails = NewUser(usernameString, passwordPassed, emailPassed, birthdayPassed, birthYearPassed, fullnameString, genderString)
  2. registerViewModel.doRegisterUserEmail(userDetails)
  4. registerViewModel.saveDetailsEmail.observe(viewLifecycleOwner, Observer {
  5.     when (it.status) {
  6.         Resource.Status.SUCCESS -> {
  7.             if (it.data?.success == "0") {
  8.                 // Display error
  9.                 Toast.makeText(requireContext(), it.data.message + "Registration", Toast.LENGTH_LONG).show()
  10.             } else if (it.data?.success == "1") {
  11.                 // Go to home activity
  12.                 Toast.makeText(requireContext(), it.data.message + "Registrationx", Toast.LENGTH_LONG).show()
  13.                 val action = DetailsFragmentDirections.actionDetailsFragmentToHomeActivity()
  14.                 navController.navigate(action)
  15.             }
  16.         }
  17.         Resource.Status.LOADING -> {
  18.             // Show loading
  19.         }
  20.         Resource.Status.ERROR -> {
  21.             Toast.makeText(requireContext(), it.toString(), Toast.LENGTH_LONG).show()
  22.         }
  23.     }
  24. })

RESOURCE 类更新

  1. data class Resource<out T>(val status: Status, val data: T?, val message: String?) {
  2.     enum class Status {
  3.         SUCCESS,
  4.         ERROR,
  5.         LOADING
  6.     }
  8.     companion object {
  9.         fun <T> success(data: T): Resource<T> {
  10.             return Resource(Status.SUCCESS, data, null)
  11.         }
  13.         fun <T> error(message: String, data: T? = null): Resource<T> {
  14.             return Resource(Status.ERROR, data, message)
  15.         }
  17.         fun <T> loading(data: T? = null): Resource<T> {
  18.             return Resource(Status.LOADING, data, null)
  19.         }
  20.     }
  21. }

这是使用 POSTMAN 测试后的响应，它是正常工作的：

  1. {"success":"1","message":"User details saved"}

UPDATE - 完整 LOGCAT

（这里是日志信息，包含了发送请求和响应的信息）

PHP 代码

（这里是 PHP 代码，用于处理 POST 请求并将数据存储到数据库）

英文:

I am trying to make a Post Request using Retrofit, MVVM, Coroutines and Hilt.

After sending the post request I get this error

java.lang.IllegalStateException: Expected BEGIN_OBJECT but was STRING at line 1 column 1 path $

(I have searched but none was helpful)

AppModule

  1. @Provides
  2. @Singleton
  3. fun provideRetrofit(gson: Gson) : Retrofit = Retrofit.Builder()
  4.     .baseUrl(EndPoints.BASE_URL)
  5.     .client(OkHttpClient.Builder().also { client -&gt;
  6.         if (BuildConfig.DEBUG){
  7.             val logging = HttpLoggingInterceptor()
  8.             logging.setLevel(HttpLoggingInterceptor.Level.BODY)
  9.             client.addInterceptor(logging)
  10.         }
  11.        }.build()
  12.     )
  13.     .addConverterFactory(ScalarsConverterFactory.create())
  14.     .addConverterFactory(GsonConverterFactory.create(gson))
  15.     .build()
  17. @Provides
  18. @Singleton
  19. fun provideApiService(retrofit: Retrofit) = retrofit.create(ApiService::class.java)

ApiService

  1. @POST(EndPoints.REGISTER_WITH_EMAIL)
  2. suspend fun registerUserWithEmail(@Body newUser: NewUser) : Response&lt;JsonResponse&gt;

ApiDataSource

  1. suspend fun createNewUserEmail(newUser: NewUser) = apiService.registerUserWithEmail(newUser)

NewUser

  1. data class NewUser (
  2. @SerializedName(&quot;username&quot;) val userName: String?,
  3. @SerializedName(&quot;password&quot;) val password: String?,
  4. @SerializedName(&quot;email&quot;) val email: String?,
  5. @SerializedName(&quot;birthday&quot;) val birthday: String?,
  6. @SerializedName(&quot;birth_year&quot;) val birthYear: String?,
  7. @SerializedName(&quot;fullname&quot;) val fullname: String?,
  8. @SerializedName(&quot;gender&quot;) val gender: String?)

RegisterRepo

  1. suspend fun saveUserWithEmail(newUser: NewUser) = safeApiCall { 
  2. apiDataSource.createNewUserEmail(newUser) }

RegisterViewModel

  1. //SaveUserDetails
  3. private val _saveDetailsEmail = MutableLiveData&lt;Resource&lt;JsonResponse&gt;&gt;()
  5. fun doRegisterUserEmail(newUser: NewUser) = viewModelScope.launch {
  6.     try {
  7.         _saveDetailsEmail.value = registerRepo.saveUserWithEmail(newUser)
  8.     }
  9.     catch (exception: Exception){
  11.     }
  12. }

JsonResponse

  1. data class JsonResponse (val success: String, val message: String)

RegisterFragment

  1. val userDetails = NewUser(usernameString, passwordPassed, emailPassed, birthdayPassed, birthYearPassed, fullnameString, genderString)
  2.     registerViewModel.doRegisterUserEmail(userDetails)
  5.     registerViewModel.saveDetailsEmail.observe(viewLifecycleOwner, Observer {
  6.         when(it.status){
  7.             Resource.Status.SUCCESS -&gt; {
  8.                 if(it.data?.success == &quot;0&quot;){
  9.                     //Display error
  10.                     Toast.makeText(requireContext(), it.data.message + &quot;Registration&quot;, Toast.LENGTH_LONG ).show()
  11.                 }
  12.                 else if(it.data?.success == &quot;1&quot;){
  13.                     //go to home activity
  14.                     Toast.makeText(requireContext(), it.data.message + &quot;Registrationx&quot;, Toast.LENGTH_LONG ).show()
  15.                     val action  = DetailsFragmentDirections.actionDetailsFragmentToHomeActivity()
  16.                     navController.navigate(action)
  17.                 }
  18.             }
  19.             Resource.Status.LOADING -&gt; {
  20.                 //Show loading
  21.             }
  22.             Resource.Status.ERROR -&gt; {
  23.                 Toast.makeText(requireContext(), it.toString(), Toast.LENGTH_LONG).show()
  24.             }
  25.         }
  26.     })
  28. }

This is the response after testing with POSTMAN. it was working

  1. {&quot;success&quot;:&quot;1&quot;,&quot;message&quot;:&quot;User details saved&quot;}

Update RESOURCE class

  1. data class Resource&lt;out T&gt;(val status: Status, val data: T?, val message: String?) {
  3. enum class Status {
  4.     SUCCESS,
  5.     ERROR,
  6.     LOADING
  7. }
  10. companion object {
  11.     fun &lt;T&gt; success(data: T): Resource&lt;T&gt; {
  12.         return Resource(Status.SUCCESS, data, null)
  13.     }
  15.     fun &lt;T&gt; error(message: String, data: T? = null): Resource&lt;T&gt; {
  16.         return Resource(Status.ERROR, data, message)
  17.     }
  19.     fun &lt;T&gt; loading(data: T? = null): Resource&lt;T&gt; {
  20.         return Resource(Status.LOADING, data, null)
  21.     }
  22. }

UPDATE - FULL LOGCAT

  1.     6:01.640 20137-20305/com.snappmi.snappmi I/okhttp.OkHttpClient: --&gt; POST 
  2.    https://2e3045dc760e.ngrok.io/snappmi/account/register/register_with_email.php
  3.     09-20 14:26:01.640 20137-20305/com.snappmi.snappmi I/okhttp.OkHttpClient: Content-Type: application/json
  4.     09-20 14:26:01.640 20137-20305/com.snappmi.snappmi I/okhttp.OkHttpClient: Content-Length: 150
  5.     09-20 14:26:01.640 20137-20305/com.snappmi.snappmi I/okhttp.OkHttpClient: {&quot;birth_year&quot;:&quot;1999&quot;,&quot;birthday&quot;:&quot;1999-09-20&quot;,&quot;email&quot;:&quot;makanaki@gmail.com&quot;,&quot;fullname&quot;:&quot;makanaki&quot;,&quot;gender&quot;:&quot;Male&quot;,&quot;password&quot;:&quot;yellow&quot;,&quot;username&quot;:&quot;maka&quot;}
  6.     09-20 14:26:01.640 20137-20305/com.snappmi.snappmi I/okhttp.OkHttpClient: --&gt; END POST (150-byte body)
  7.     09-20 14:26:01.660 20137-20137/com.snappmi.snappmi W/DisplayListCanvas: DisplayListCanvas is started on unbinded RenderNode (without mOwningView)
  8.     09-20 14:26:01.660 20137-20137/com.snappmi.snappmi W/DisplayListCanvas: DisplayListCanvas is started on unbinded RenderNode (without mOwningView)
  9.     09-20 14:26:08.140 20137-20305/com.snappmi.snappmi I/okhttp.OkHttpClient: &lt;-- 200 https://2e3045dc760e.ngrok.io/snappmi/account/register/register_with_email.php (6500ms)
  10.     09-20 14:26:08.140 20137-20305/com.snappmi.snappmi I/okhttp.OkHttpClient: content-type: text/html; charset=UTF-8
  11.     09-20 14:26:08.140 20137-20305/com.snappmi.snappmi I/okhttp.OkHttpClient: date: Sun, 20 Sep 2020 13:27:07 GMT
  12.     09-20 14:26:08.140 20137-20305/com.snappmi.snappmi I/okhttp.OkHttpClient: server: Apache/2.4.43 (Win64) OpenSSL/1.1.1g PHP/7.4.6
  13.     09-20 14:26:08.140 20137-20305/com.snappmi.snappmi I/okhttp.OkHttpClient: x-powered-by: PHP/7.4.6
  14.     09-20 14:26:08.140 20137-20305/com.snappmi.snappmi I/okhttp.OkHttpClient: content-length: 1475
  15.     09-20 14:26:08.150 20137-20305/com.snappmi.snappmi I/okhttp.OkHttpClient: &lt;br /&gt;
  16.     09-20 14:26:08.150 20137-20305/com.snappmi.snappmi I/okhttp.OkHttpClient: &lt;b&gt;Notice&lt;/b&gt;:  Undefined index: username in &lt;b&gt;C:\xampp\htdocs\snappmi\account\register\register_with_email.php&lt;/b&gt; on line &lt;b&gt;7&lt;/b&gt;&lt;br /&gt;
  17.     09-20 14:26:08.150 20137-20305/com.snappmi.snappmi I/okhttp.OkHttpClient: &lt;br /&gt;
  18.     09-20 14:26:08.150 20137-20305/com.snappmi.snappmi I/okhttp.OkHttpClient: &lt;b&gt;Notice&lt;/b&gt;:  Undefined index: password in &lt;b&gt;C:\xampp\htdocs\snappmi\account\register\register_with_email.php&lt;/b&gt; on line &lt;b&gt;8&lt;/b&gt;&lt;br /&gt;
  19.     09-20 14:26:08.150 20137-20305/com.snappmi.snappmi I/okhttp.OkHttpClient: &lt;br /&gt;
  20.     09-20 14:26:08.150 20137-20305/com.snappmi.snappmi I/okhttp.OkHttpClient: &lt;b&gt;Notice&lt;/b&gt;:  Undefined index: email in &lt;b&gt;C:\xampp\htdocs\snappmi\account\register\register_with_email.php&lt;/b&gt; on line &lt;b&gt;9&lt;/b&gt;&lt;br /&gt;
  21.     09-20 14:26:08.150 20137-20305/com.snappmi.snappmi I/okhttp.OkHttpClient: &lt;br /&gt;
  22.     09-20 14:26:08.150 20137-20305/com.snappmi.snappmi I/okhttp.OkHttpClient: &lt;b&gt;Notice&lt;/b&gt;:  Undefined index: birthday in &lt;b&gt;C:\xampp\htdocs\snappmi\account\register\register_with_email.php&lt;/b&gt; on line &lt;b&gt;10&lt;/b&gt;&lt;br /&gt;
  23.     09-20 14:26:08.150 20137-20305/com.snappmi.snappmi I/okhttp.OkHttpClient: &lt;br /&gt;
  24.     09-20 14:26:08.150 20137-20305/com.snappmi.snappmi I/okhttp.OkHttpClient: &lt;b&gt;Notice&lt;/b&gt;:  Undefined index: birth_year in &lt;b&gt;C:\xampp\htdocs\snappmi\account\register\register_with_email.php&lt;/b&gt; on line &lt;b&gt;11&lt;/b&gt;&lt;br /&gt;
  25.     09-20 14:26:08.150 20137-20305/com.snappmi.snappmi I/okhttp.OkHttpClient: &lt;br /&gt;
  26.     09-20 14:26:08.150 20137-20305/com.snappmi.snappmi I/okhttp.OkHttpClient: &lt;b&gt;Notice&lt;/b&gt;:  Undefined index: fullname in &lt;b&gt;C:\xampp\htdocs\snappmi\account\register\register_with_email.php&lt;/b&gt; on line &lt;b&gt;12&lt;/b&gt;&lt;br /&gt;
  27.     09-20 14:26:08.150 20137-20305/com.snappmi.snappmi I/okhttp.OkHttpClient: &lt;br /&gt;
  28.     09-20 14:26:08.150 20137-20305/com.snappmi.snappmi I/okhttp.OkHttpClient: &lt;b&gt;Notice&lt;/b&gt;:  Undefined index: gender in &lt;b&gt;C:\xampp\htdocs\snappmi\account\register\register_with_email.php&lt;/b&gt; on line &lt;b&gt;13&lt;/b&gt;&lt;br /&gt;
  29.     09-20 14:26:08.150 20137-20305/com.snappmi.snappmi I/okhttp.OkHttpClient: &lt;br /&gt;
  30.   }

PHP SCODE

  1. if ($_SERVER[&#39;REQUEST_METHOD&#39;]==&#39;POST&#39;){
  3.  $username = $_POST[&#39;username&#39;];
  4.  $password = $_POST[&#39;password&#39;];
  5.  $email = $_POST[&#39;email&#39;];
  6.  $birthday = $_POST[&#39;birthday&#39;];
  7.  $birth_year = $_POST[&#39;birth_year&#39;];
  8.  $fullname = $_POST[&#39;fullname&#39;];
  9.  $gender = $_POST[&#39;gender&#39;];
  10.  $joined = date(&#39;Y/m/d H:i:s&#39;);
  11.  $hashed_password = password_hash($password, PASSWORD_DEFAULT);
  13. if(usernameExists($conn, $username))
  14.  {
  15.      $result[&quot;success&quot;] = &quot;0&quot;;
  16.      $result[&quot;message&quot;] = &quot;Username already taken&quot;;
  17.      echo json_encode($result);
  18.  }
  20.  elseif(!usernameExists($conn, $username)){
  22.       $sql = &quot;INSERT INTO users (username, password, email, birthday, birth_year, fullname, gender, joined) VALUES (?,?,?,?,?,?,?,?)&quot;;
  24.        $stmt= $conn-&gt;prepare($sql);
  25.        $stmt-&gt;execute([$username, $hashed_password, $email, $birthday, $birth_year, $fullname, $gender, $joined]);
  27.        if($stmt){
  28.            $result[&quot;success&quot;] = &quot;1&quot;;
  29.            $result[&quot;message&quot;] = &quot;success&quot;;
  30.            echo json_encode($result);
  31.        }
  33.  }
  35.  else{
  37.       $result[&quot;success&quot;] = &quot;0&quot;;
  38.       $result[&quot;message&quot;] = &quot;An error occured&quot; .mysqli_error($conn);
  40.       echo json_encode($result);
  41.  }

}

答案1

得分: 1

我必须解码发送到服务器的 JSON 数据，特别是在这里内容类型为 application/json 时。

  1. $data = file_get_contents('php://input');
  2. $json_data = json_decode($data, true);
  3. // 我在上面添加了这些
  5. if ($_SERVER['REQUEST_METHOD'] == 'POST') {
  6.     $username = $json_data["username"];
  7.     $password = $json_data["password"];
  8.     $email = $json_data["email"];
  9. }
英文:

I had to decode the JSON sent to the server especially when the content type here is application/json

  1. $data = file_get_contents(&#39;php://input&#39;);
  2. $json_data = json_decode($data , true);
  3. //I added these above
  5. if ($_SERVER[&#39;REQUEST_METHOD&#39;]==&#39;POST&#39;){
  7.  $username = $json_data[&quot;username&quot;];
  8.  $password = $json_data[&quot;password&quot;];
  9.  $email = $json_data[&quot;email&quot;];
  11. }

huangapple
  • 本文由 发表于 2020年9月20日 16:17:12
  • 转载请务必保留本文链接：https://go.coder-hub.com/63976924.html
  • android
  • java
  • kotlin
  • php
  • retrofit
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