我使用 Retrofit2 向服务器发送 10 个值。我发送的值应该是(根据 logd):
getRecommendations 值:
-1、-1、-1、-1、-1、-1、3、25、44.182345、7.1627383。
但是，当我通过改造将值发送到服务器(到 PHP 脚本)时，它们将被发送为
-1, -1 ,0 ,-1 ,-1 ,0 ,25 ,44.182345 , 7.1627383。
我知道这一点是因为我在 Android Studio 中使用 PHP 拦截器。 PHP 拦截器显示的内容如下:
maxGradientLo=-1&maxGradientHi=-1&totalDistanceLo=0&totalDistanceHi=-1&altitudeGainLo=-1&altitudeGainHi=-1&numberToRecommend=0&searchWithin=25¤tLatitude=44.182345¤tLongitude=7.1627349853515625
我很困惑为什么会出现这种情况 - 有些值只是随机更改，下面我附上了部分代码。
getRecommendations() - 将数据发送到服务器
private List<RecommendationJsonResponse> jsonResponse = null;
private void getRecommendations(int maxGradientLo, int maxGradientHi, int totalDistanceLo, int totalDistanceHi, int altitudeGainLo, int altitudeGainHi, int numberToRecommend, int searchWithin, double currentLatitude, double currentLongitude){
Log.d(Constants.SkiCompanionDebug, "getRecommendations values: " + maxGradientLo + ", "+ maxGradientHi + ", "+ totalDistanceLo + ", "+ totalDistanceHi + ", "+ altitudeGainLo + ", "+ altitudeGainHi + ", "+ numberToRecommend + ", "+ searchWithin);
RetrofitApiInterface retrofitApiInterface = RetrofitApiClient.getApiClient().create(RetrofitApiInterface.class);
Call<List<RecommendationJsonResponse>> callRecommendations = retrofitApiInterface.downloadRecommendations(maxGradientLo, maxGradientHi, totalDistanceLo, totalDistanceHi, altitudeGainLo, altitudeGainHi, numberToRecommend, searchWithin, currentLatitude, currentLongitude);
callRecommendations.enqueue(new Callback<List<RecommendationJsonResponse>>() {
@Override
public void onResponse(Call<List<RecommendationJsonResponse>> call, Response<List<RecommendationJsonResponse>> response) {
jsonResponse = response.body();
//calling helper functions to populate map with ski tracks
List<List<GeoPoint>> trackList = new ArrayList<>();
trackList = populateGeoPointLists();
populateMap(trackList);
}
@Override
public void onFailure(Call<List<RecommendationJsonResponse>> call, Throwable t) {
Log.d(Constants.SkiCompanionDebug, "onFailure: downloadRecommendations: " + t.getMessage());
}
});
}
Retrofit接口(interface)中方法的定义
@POST("download_recommendations.php")
@FormUrlEncoded
Call<List<RecommendationJsonResponse>> downloadRecommendations(@Field("maxGradientLo") int maxGradientLo,
@Field("maxGradientHi") int maxGradientHi,
@Field("totalDistanceLo") int totalDistanceLo,
@Field("totalDistanceHi") int totalDistanceHi,
@Field("altitudeGainLo") int altitudeGainLo,
@Field("altitudeGainHi") int altitudeGainHi,
@Field("numberToRecommend") int numberToRecommend,
@Field("searchWithin") int searchWithin,
@Field("currentLatitude") double currentLatitude,
@Field("currentLongitude") double currentLongitude);
调用 getRecommendations()
final int[] gradient = new int[2];
final int[] distance = new int[2];
final int[] altitude = new int[2];
final int[] recommendNumber = new int[1];
final int[] searchWithin = new int[1];
//initializing variables
gradient[0] = -1;
gradient[1] = -1;
distance[0] = -1;
distance[1] = -1;
altitude[0] = -1;
altitude[1] = -1;
recommendNumber[0] = 3;
searchWithin[0] = 25;
getRecommendations(gradient[0], gradient[1], distance[0], distance[1], altitude[0], altitude[1], recommendNumber[0], searchWithin[0], 44.182345, 7.1627383);
发布值的 PHP 脚本 - 请注意，当我回显时，值是错误的，与 PHP 拦截器给出的值相同
$maxGradientLo = $_POST["maxGradientLo"]; //degrees
$maxGradientHi = $_POST["maxGradientHi"];
$totalDistanceLo = $_POST["totalDistanceLo"]; //kilometers
$totalDistanceHi = $_POST["totalDistanceHi"];
$altitudeGainLo = $_POST["altitudeGainLo"]; //meters
$altitudeGainHi = $_POST["altitudeGainHi"];
$numberToRecommend = $_POST["numberToRecommend"];
$searchWithin = $_POST["searchWithin"]; //number of kilometers track can be from user
$currentLatitude = $_POST["currentLatitude"];
$currentLongitude = $_POST["currentLongitude"];
// echo "gradLo: " .$maxGradientLo ." gradHi: " .$maxGradientHi." distLo: " .$totalDistanceLo." distHi: " .$totalDistanceHi." altLo: " .$altitudeGainLo." altHi: " .$altitudeGainHi. " numTorecommend: ".$numberToRecommend;
从 OkHttp 拦截器中提取
02-22 17:12:31.967 25165-25426/skicompanion.skicompanion D/OkHttp: --> POST http://192.168.1.11/ski_companion/download_recommendations.php
02-22 17:12:31.967 25165-25426/skicompanion.skicompanion D/OkHttp: Content-Type: application/x-www-form-urlencoded
02-22 17:12:31.970 25165-25426/skicompanion.skicompanion D/OkHttp: Content-Length: 204
02-22 17:12:31.971 25165-25426/skicompanion.skicompanion D/OkHttp: maxGradientLo=-1&maxGradientHi=-1&totalDistanceLo=0&totalDistanceHi=-1&altitudeGainLo=-1&altitudeGainHi=-1&numberToRecommend=0&searchWithin=25¤tLatitude=44.182345¤tLongitude=7.1627349853515625
02-22 17:12:31.972 25165-25426/skicompanion.skicompanion D/OkHttp: --> END POST (204-byte body)
02-22 17:12:32.212 25165-25426/skicompanion.skicompanion D/OkHttp: <-- 200 OK http://192.168.1.11/ski_companion/download_recommendations.php (239ms)
02-22 17:12:32.212 25165-25426/skicompanion.skicompanion D/OkHttp: Date: Thu, 22 Feb 2018 17:12:33 GMT
02-22 17:12:32.212 25165-25426/skicompanion.skicompanion D/OkHttp: Server: Apache/2.4.29 (Win32) OpenSSL/1.1.0g PHP/7.2.1
02-22 17:12:32.213 25165-25426/skicompanion.skicompanion D/OkHttp: X-Powered-By: PHP/7.2.1
02-22 17:12:32.213 25165-25426/skicompanion.skicompanion D/OkHttp: Keep-Alive: timeout=5, max=100
02-22 17:12:32.213 25165-25426/skicompanion.skicompanion D/OkHttp: Connection: Keep-Alive
02-22 17:12:32.213 25165-25426/skicompanion.skicompanion D/OkHttp: Transfer-Encoding: chunked
02-22 17:12:32.213 25165-25426/skicompanion.skicompanion D/OkHttp: Content-Type: text/html; charset=UTF-8
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02-22 17:12:32.406 25165-25426/skicompanion.skicompanion D/OkHttp: <-- END HTTP (17280-byte body)
额外的 POJO 类
public class RetrofitApiClient {
public static final String BASE_URL = "http://" + Constants.SERVER_IP + "/ski_companion/";
public static Retrofit retrofit = null;
public static Retrofit getApiClient(){
if(retrofit == null){
HttpLoggingInterceptor interceptor = new HttpLoggingInterceptor();
interceptor.setLevel(HttpLoggingInterceptor.Level.BODY);
OkHttpClient client = new OkHttpClient.Builder()
.addInterceptor(interceptor)
.retryOnConnectionFailure(true)
.connectTimeout(15, TimeUnit.SECONDS)
.build();
retrofit = new Retrofit.Builder().baseUrl(BASE_URL).
addConverterFactory(GsonConverterFactory.create()).client(client).build();
}
return retrofit;
}
}
最佳答案
为了实现Retrofit实例的单例设计模式，请参见以下代码:
public class ApiClient extends Application {
private static ApiClient apiClient = null; //singleton Object
String apiURL = "http://your.url/";
public static ApiClient getApiClient() {//getter for object
if (apiClient == null)
apiClient = new ApiClient();
return apiClient;
}
@Override
public void onCreate() {
super.onCreate();
Stetho.initializeWithDefaults(this);
}
public Retrofit getClient() {//Retrofit instance
int myTime = 15;
OkHttpClient.Builder okHttpBuilder = new OkHttpClient.Builder()
.connectTimeout(myTime, TimeUnit.SECONDS)
.readTimeout(myTime, TimeUnit.SECONDS)
.writeTimeout(myTime, TimeUnit.SECONDS)
.addNetworkInterceptor(new StethoInterceptor());
Retrofit.Builder builder = new Retrofit.Builder()
.baseUrl(apiURL)
.client(okHttpBuilder.build())
.addConverterFactory(GsonConverterFactory.create());
return builder.build();
}
}
现在要使用retrofit，请参阅以下代码:
LoginDTO loginDTO = new LoginDTO(
etPhno.getText().toString().trim(),
etPass.getText().toString().trim()
);
ApiService service = ApiClient.getApiClient().getClient().create(ApiService.class);
Call<LoginResp> call = service.loginAPI(loginDTO);
call.enqueue(new Callback<LoginResp>() {
@Override
public void onResponse(Call<LoginResp> call, Response<LoginResp> response) {
LoginResp loginResp = response.body();
}
@Override
public void onFailure(Call<LoginResp> call, Throwable t) {
Toast.makeText(Login.this, "Error here", Toast.LENGTH_SHORT).show();
}
});
在ApiService接口(interface)中声明如下函数:
@POST("login")
Call<LoginResp> loginAPI(@Body LoginDTO loginDTO);
LoginDTO 类如下所示:
public class LoginDTO {
@SerializedName("log_phno")
@Expose
private String user;
@SerializedName("log_pass")
@Expose
private String pass;
public LoginDTO(String user, String pass) {
this.user = user;
this.pass = pass;
}
public String getUser() {
return user;
}
public String getPass() {
return pass;
}
}
现在是最重要的部分，转到 list 文件并在 <application> 下标签将您的单例类名前面加一个点(.)，如下所示:
android:name=".Controller.ApiClient"
最后要看看 Stetho Interceptor 的魔力，运行您的应用程序并打开 Google Chrome 并输入 chrome://inspect/
关于java - 改造 POST 向服务器发送错误的值，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/48933144/