android - 如何在 android 中使用 Retrofit 2 发布 JSON？

Question

我是 android 的新手，我不知道如何使用 retrofit 进行 POST

我有自己的服务器返回数据，我需要获取那个服务器

这是 URL 正文的样子

我必须发送由 edittext 获取的“城市名称”并将其传递到“ms_data 的”关键字中，即 keyword="India"

这是我到目前为止尝试过的...

Retrofit Builder 类

public class RetrofitBuilder {

public static Retrofit retrofit;

public static final String BASE_URL = "my url";

public static Retrofit getApiData()
{

    if(retrofit==null)
    {
        retrofit = new Retrofit.Builder().baseUrl(BASE_URL)
                   .addConverterFactory(GsonConverterFactory.create()).build();
    }
    return retrofit;
}
}

POJO 类

public class MessageFromServer {

private String city_name;

public MessageFromServer(String city_name) {
            this.city_name = city_name;
}

public String getCity_name() {
    return city_name;
}

public void setCity_name(String city_name) {
    this.city_name = city_name;
}

@Override
public boolean equals(Object o) {
    if (this == o) return true;
    if (o == null || getClass() != o.getClass()) return false;

    MessageFromServer that = (MessageFromServer) o;

    return city_name != null ? city_name.equals(that.city_name) : that.city_name == null;

}

@Override
public int hashCode() {
    return city_name != null ? city_name.hashCode() : 0;
}

@Override
public String toString() {
    return "MessageFromServer{" +
            "city_name='" + city_name + '\'' +
            '}';
}
}

RequestBean 类

public class JsonRequestBean {

private  String userId;
private String sessionToken;
private String clientType;
private String msServiceType;
private String msService;
private  String searchedLoc = null;
private List<String> msdata = null;




public List<String> getMsdata() {
    return msdata;
}

public void setMsdata(List<String> msdata) {
    this.msdata = msdata;
}


public JsonRequestBean() {
}

public JsonRequestBean(String userId, String sessionToken, String 
clientType, String msServiceType, String msService, String 
serachedLoc) {
    this.userId = userId;
    this.sessionToken = sessionToken;
    this.clientType = clientType;
    this.msServiceType = msServiceType;
    this.msService = msService;
    this.searchedLoc = serachedLoc;
}

public String getUserId() {
    return userId;
}

public void setUserId(String userId) {
    this.userId = userId;
}

public String getSessionToken() {
    return sessionToken;
}

public void setSessionToken(String sessionToken) {
    this.sessionToken = sessionToken;
}

public String getClientType() {
    return clientType;
}

public void setClientType(String clientType) {
    this.clientType = clientType;
}

public String getMsServiceType() {
    return msServiceType;
}

public void setMsServiceType(String msServiceType) {
    this.msServiceType = msServiceType;
}

public String getMsService() {
    return msService;
}

public void setMsService(String msService) {
    this.msService = msService;
}

public String getSerachedLoc() {
    return searchedLoc;
}

public void setSerachedLoc(String serachedLoc) {
    this.searchedLoc = serachedLoc;
}

@Override
public boolean equals(Object o) {
    if (this == o) return true;
    if (o == null || getClass() != o.getClass()) return false;

    JsonRequestBean that = (JsonRequestBean) o;

    if (userId != null ? !userId.equals(that.userId) : that.userId != 
null) return false;
    if (sessionToken != null ? !sessionToken.equals(that.sessionToken) 
: that.sessionToken != null)
        return false;
    if (clientType != null ? !clientType.equals(that.clientType) : 
that.clientType != null)
        return false;
    if (msServiceType != null ? 
!msServiceType.equals(that.msServiceType) : that.msServiceType != 
null)
        return false;
    if (msService != null ? !msService.equals(that.msService) : 
that.msService != null)
        return false;
    return searchedLoc != null ? searchedLoc.equals(that.searchedLoc) 
: that.searchedLoc == null;

}

@Override
public int hashCode() {
    int result = userId != null ? userId.hashCode() : 0;
    result = 31 * result + (sessionToken != null ? 
sessionToken.hashCode() : 0);
    result = 31 * result + (clientType != null ? clientType.hashCode() 
: 0);
    result = 31 * result + (msServiceType != null ? 
msServiceType.hashCode() : 0);
    result = 31 * result + (msService != null ? msService.hashCode() : 
0);
    result = 31 * result + (searchedLoc != null ? 
searchedLoc.hashCode() : 0);
    return result;
}

@Override
public String toString() {
    return "JsonRequestBean{" +
            "userId='" + userId + '\'' +
            ", sessionToken='" + sessionToken + '\'' +
            ", clientType='" + clientType + '\'' +
            ", msServiceType='" + msServiceType + '\'' +
            ", msService='" + msService + '\'' +
            ", serachedLoc=" + searchedLoc +
            '}';
}

private class Msdata {

    public String keyword;

    public void setKeyword(String keyword) {
        this.keyword = keyword;
    }
}
}

ResponseBean类//获取和存储以便我可以根据需要使用

public class JsonResponseBean {

@SerializedName("city_name")
@Expose
public String cityName;
@SerializedName("id")
@Expose
public String id;


public JsonResponseBean(String cityName, String id) {
    this.cityName = cityName;
    this.id = id;
}

public void setCityName(String cityName) {
    this.cityName = cityName;
}

public String getCityName() {
    return cityName;
}

public String getId() {
    return id;
}

public JsonResponseBean() {
}

@Override
public boolean equals(Object o) {
    if (this == o) return true;
    if (o == null || getClass() != o.getClass()) return false;

    JsonResponseBean that = (JsonResponseBean) o;

    if (cityName != null ? !cityName.equals(that.cityName) : 
 that.cityName != null)
        return false;
    return id != null ? id.equals(that.id) : that.id == null;

}

@Override
public int hashCode() {
    int result = cityName != null ? cityName.hashCode() : 0;
    result = 31 * result + (id != null ? id.hashCode() : 0);
    return result;
}


@Override
public String toString() {
    return "JsonRequestBean{" +
            "cityName='" + cityName + '\'' +
            ", id='" + id + '\'' +
            '}';
}
}

//内部类，可以看图//我使用 jsonschema2pojo.org 生成了这个

 class errorCode
 {
    @SerializedName("data")
    @Expose
    public List<JsonResponseBean> data = null;
    @SerializedName("error_code")
    @Expose
    public String errorCode;
    @SerializedName("message")
    @Expose
    public String message;
    @SerializedName("status")
    @Expose
    public String status;

}

API 类

public interface APIRequest {

@Headers({"Content-Type: application/json","Accept: 
application/json"})
@POST("/lfs/city_name")
Call<JsonResponseBean> locData (@Body JsonRequestBean mRequest);
}

我获取实际数据的 DisplayActivity

//一旦我打开activty，就会调用onfailure

public class DisplayActivity extends AppCompatActivity {


public static TextView tvM,tvN;
private Button btnFetch;
private EditText etCity;
private static final String TAG = "DisplayActivity";
private static final String VALUE = "displaytest";

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_display);

    init();

    Intent i = getIntent();
    String text = i.getStringExtra("HESRU");
    tvN.setText(text);
     String city_name = etCity.getText().toString();
    final List<String> cityList = new ArrayList<>() ;
     cityList.add(city_name);
    Log.d(TAG, "onCreate: city name-"+city_name);


    btnFetch.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Retrofit retrofit = RetrofitBuilder.getApiData();
            APIRequest service = retrofit.create(APIRequest.class);

            JsonRequestBean jsonRequestBean = new JsonRequestBean();
            jsonRequestBean.setClientType("mobile");
            jsonRequestBean.setMsServiceType("search");
            jsonRequestBean.setMsService("locality");
            jsonRequestBean.setMsdata(cityList);

            Call<JsonResponseBean> responseBeanCall = 
service.locData(jsonRequestBean);
            responseBeanCall.enqueue(new Callback<JsonResponseBean>() 
{
                @Override
                public void onResponse(Call<JsonResponseBean> call, 
Response<JsonResponseBean> response) {
                    Log.d(TAG, "onResponse: 
"+response.isSuccessful());
                    Log.d(TAG, "onResponse:, responebody---
"+response.body());
                }

                @Override
                public void onFailure(Call<JsonResponseBean> call, 
Throwable t) {
                    Log.e(TAG, "onFailure: message"+t.getMessage() );
                    t.printStackTrace();
                    Toast.makeText(DisplayActivity.this, "something 
went wrong", Toast.LENGTH_SHORT).show();
                }
            });
        }
    });


}
public void init() {
    tvM = (TextView) findViewById(R.id.textViewMSG);
    tvN = (TextView) findViewById(R.id.txtViewName);
    btnFetch = (Button) findViewById(R.id.buttonfetch);
    etCity = (EditText) findViewById(R.id.etCity);
}

请帮助解决这个问题，我发现我应该使用 HttpUrlConnection，但我不知道该怎么做。

Answer 1

请按照以下步骤操作:

1.) 首先为来自 http://www.jsonschema2pojo.org/ 的 Post 请求创建模态类 (MyRequestClass)

2.) 同时为来自同一站点的服务器响应创建模态 (MyResponseClass)。

3.) 通过创建 MyRequestClass 对象来设置要发送到服务器的值。

4.) 然后在您的界面中使用此方法访问 api:

@POST("/provider/filter")
Call<MyResponseClass> sendDataToServer(@Body MyRequestClass myModal);