Question

我通过.ne t核心 API 提供了一些休息服务。我在Android应用程序中使用以下代码对其进行了调用。有时服务工作并返回了数据，但有时我却得到了status code 200但没有返回任何值。我很迷惑！我不知道发生了什么，为什么具体方法有时行得通，有时行不通！

服务：

[Route("api/[controller]")]
[ApiController]
public class PMServicesController : BaseController
{
    private readonly IPMServices pmService;

    public PMServicesController(
        IPMServices pmService)
    {
        this.pmService = pmService;
    }
    [Route("Test"), HttpPost]
    public string set(string test)
    {
        return "Test is successfull";
    }
}

在android中：

@Override
protected String doInBackground(Object... params) {
    try {

        String uri = serviceURL + "/" + methodName;

        HttpConnectionParams.setConnectionTimeout(httpParameters,
                connectionTimeout);
        HttpConnectionParams.setSoTimeout(httpParameters, socketTimeOut);
        httpClient.setParams(httpParameters);
        HttpResponse response = null;

        this.requestType = HttpRequestType.GET;
        if (params.length == 1) {
            this.requestType = HttpRequestType.POST;
        }
        /*if (params.length > 1)
            if (params[0] != null)
                this.requestType = HttpRequestType.POST;*/


        if (this.requestType == HttpRequestType.POST) {
            // /// Input parameter exists /////////////

            //this.jsonStringer = getJsonStringFromObject(params);
            this.jsonStringer=params[0].toString();
            HttpPost request = new HttpPost(uri);
            request.setHeader("Accept", "application/json");
            request.setHeader("Content-type", "application/json");
            StringEntity msg = new StringEntity(jsonStringer,HTTP.UTF_8);
            msg.setContentEncoding(new BasicHeader(HTTP.CONTENT_TYPE,
                    "application/json"));
            msg.setContentType(new BasicHeader(HTTP.CONTENT_TYPE,
                    "application/json"));


            request.setEntity(msg);
            response = httpClient.execute(request);
        } else {
            uri = uri ;//+ "?" + params[0];
            HttpGet request = new HttpGet(uri);
            response = httpClient.execute(request);
        }

        /*int b;
        if(methodName.equalsIgnoreCase("PostCurrent"))
           b = response.getStatusLine().getStatusCode();*/
        int r = response.getStatusLine().getStatusCode();
        isCommunicationSucceed = r == 200;
        HttpEntity responseEntity = response.getEntity();
        // Read response data into buffer
        int contentLength = (int) responseEntity.getContentLength();
        String result = "";
        // if (r == 200) {
        if (contentLength > 0) {
            char[] buffer = new char[contentLength];
            InputStream stream = responseEntity.getContent();
            InputStreamReader reader = new InputStreamReader(stream);
            int hasRead = 0;
            int readsize = 0;
            while (hasRead < contentLength) {
                readsize = reader.read(buffer, hasRead, contentLength
                        - hasRead);
                //
                publishProgress((readsize * 100) / contentLength);
                //
                if (readsize == -1)
                    break;
                hasRead += readsize;
            }
            // reader.read(buffer);
            stream.close();
            result = new String(buffer).toString().trim();
        } else {
            if (AppConstant.DEBUG_MODE)
                Log.e(this.getClass().getName(), "Empty Result in WebService: "
                        + serviceURL + "/" + methodName);
        }
      return result;
}

Answer 1

您的API是否适合邮递员或提琴手的呼叫？

服务器端，您可以尝试：

public ActionResult<string> set(string test)
{
    return Ok("Test is successfull");
}

或异步版本

public async Task<ActionResult<string>> set(string test)
    {
        return Ok("Test is successfull");
    }

Answer 2

使用改造而不是HttpClient。

添加到build.gradle

int main()
{
    std::ifstream ifs("..\\tests\\data\\some_data.txt"); // Replace with your file
    if(!ifs)
        return -1;
    
    std::unordered_map<std::string, std::array<double, 200>> dict;
    dict.reserve(300000);
    
    std::string line;
    std::string key;
    double weight;
    std::size_t i;
    
    while(getline(ifs, line))
    {
        std::istringstream record(line);
        i = 0;
    
        record >> key;
    
        while(record >> weight)
        {
            dict[key].at(i++) = weight;
        }
    }

    ifs.close();

    // The whole file is loaded

    return 0;
}

添加权限

implementation 'com.squareup.retrofit2:retrofit:2.5.0'

implementation 'com.squareup.retrofit2:converter-gson:2.5.0'

使用在线工具从json响应中制作javaObject

<uses-permission android:name="android.permission.INTERNET"></uses-permission>

用于改造的make接口：

http://www.jsonschema2pojo.org/

制作改造实例

public interface MyInterface {

    @GET("posts")
    Call<List<Post>> getPosts();

}

使用您的界面并进行改进，以生成简单的GET http请求

 Retrofit retrofit = new Retrofit.Builder().baseUrl("YOUR_API")
                .addConverterFactory(GsonConverterFactory.create())
                .build();

然后

MyInterface myInterface = retrofit.create(MyInterface.class);

 Call<List<Post>> listCall = MyInterface.getPosts();

服务返回状态码200，但不返回数据

2 个答案: