在 android 应用程序中使用 API 执行 POST 方法时，带有 "Internal server Error" 消息的 500 错误代码

Question

为了API确认，我已经在POSTMAN应用程序中尝试过，但是响应正常并且数据已成功插入。下面是 POSTMAN 的结果。

在 Logcat 中也出现以下错误。

2021-06-01 17:56:58.522 16534-16534/? E/ample.addcours: Unknown bits set in runtime_flags: 0x8000
2021-06-01 17:56:58.893 1791-2057/? E/SurfaceFlinger: ro.sf.lcd_density must be defined as a build property
2021-06-01 17:56:58.897 1791-1897/? E/SurfaceFlinger: ro.sf.lcd_density must be defined as a build property
2021-06-01 17:57:01.325 1887-1887/? E/netmgr: Failed to open QEMU pipe 'qemud:network': Invalid argument
2021-06-01 17:57:01.713 1895-1895/? E/wifi_forwarder: RemoteConnection failed to initialize: RemoteConnection failed to open pipe

2021-06-01 17:57:48.882 1746-16596/? E/ResolverController: No valid NAT64 prefix (100, <unspecified>/0)
2021-06-01 17:57:48.915 2062-2154/system_process E/InputDispatcher: Window handle Window{33fd41d u0 com.example.addcourse/com.example.addcourse.RegisterActivity} has no registered input channel
2021-06-01 17:57:48.934 2062-6837/system_process E/InputDispatcher: Window handle Window{33fd41d u0 com.example.addcourse/com.example.addcourse.RegisterActivity} has no registered input channel

我是 android 应用程序的新手。这是我使用 API 概念的第一个程序。这是我试过的代码。请指导我找到问题。

data class RegisterResponse(
    @SerializedName("status")
    val status: Int,
    @SerializedName("message")
    val message: String
)
 object ApiClient {

    // retrofit is HTTP client which can send request to API
    fun getRetrofit() : Retrofit {

        val retrofit = Retrofit.Builder()
            .addConverterFactory(GsonConverterFactory.create())  // this is used to automatically convert json string into java/kotlin object and java/kotlin object into json string whenever required
            .baseUrl("https://XXXX.com/XXXX/api/index.php/")

            .build()

        return retrofit
    }
}

interface ApiService { 
 //   @Headers("Content-type: application/json")
    @POST("Course/addCourse")
    @FormUrlEncoded

    fun signup(
        @Field("course_title") title: String,
        @Field("course_desc") desc: String,
        @Field("course_fees") fees: String
    ) : Call<RegisterResponse>

}

class RegisterActivity : AppCompatActivity() {
    lateinit var binding: ActivityRegisterBinding
    lateinit var retrofit: Retrofit
    lateinit var apiSerice: ApiService

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        binding = ActivityRegisterBinding.inflate(layoutInflater)
        setContentView(binding.root)
        retrofit = ApiClient.getRetrofit()
        apiSerice = retrofit.create(ApiService::class.java)
        binding.btnRegister.setOnClickListener {
            register()
        }
    }

    private fun register() {
        val title = binding.etCourseTitle.text.toString()
        val desc = binding.etCourseDescription.text.toString()
        val fees = binding.etCourseFee.text.toString()

        val call = apiSerice.signup(title, desc, fees)

        val progressDialog = ProgressDialog(this);
        progressDialog.setMessage("Please wait. We are processing your request")
        progressDialog.setCancelable(false)

        call.enqueue(object: Callback<RegisterResponse> {
            override fun onResponse(call: Call<RegisterResponse>, response: Response<RegisterResponse>) {

                progressDialog.dismiss()

                if(response.isSuccessful) {
                    val registerResponse: RegisterResponse? = response.body()
                    if(registerResponse?.status == 0) {
                        Toast.makeText(baseContext, "Registered successfully", Toast.LENGTH_LONG).show()
                    } else {
                        Toast.makeText(baseContext, registerResponse?.message, Toast.LENGTH_LONG).show()
                    }
                } else {
                    Toast.makeText(baseContext, response.message()+"/nSomething went wrong. Please retry.(1)", Toast.LENGTH_LONG).show()
                }
            }
            override fun onFailure(call: Call<RegisterResponse>, t: Throwable) {
                progressDialog.dismiss()
                Toast.makeText(baseContext, t.message+"Something went wrong. Please retry.(2)", Toast.LENGTH_LONG).show()
            }
        })
        progressDialog.show()
    }
}

Answer 1

您的 API 需要请求正文中的 JSON 数据。但是您正在尝试以 FormURLEncoded 的形式发送数据。

在 Kotlin 中创建数据模型 class，如下所示。

data class Course(

    @SerializedName("course_title")
    val courseTitle: String,

    @SerializedName("course_desc")
    val courseDesc: String,

    @SerializedName("course_fees")
    val courseFees: String
)

并在 ApiService.kt 文件

中进行更改

interface ApiService { 

    @POST("Course/addCourse")
    fun signup(
       @Body data: Course
    ): Call<RegisterResponse>

}

在Activity或Fragment中准备Courseclass类型的对象，传给signup()函数

// rest of your code
// .....
val data = Course("Some course title", "Course desc", "150")

val service = .....

// call and pass parameter

val call = serivce.signup(data)

// handle response here

在 android 应用程序中使用 API 执行 POST 方法时，带有 "Internal server Error" 消息的 500 错误代码

500 Error code with "Internal server Error" message, while doing POST method using API in android application

android

internal-server-error

kotlin

retrofit2