Android：Retrofit中的Converter

Posted JMW1407

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Retrofit

Retrofit之Converter

应用程序通过 Retrofit 请求网络，实际上是使用 Retrofit 接口层封装请求参数、Header、Url 等信息，之后由 OkHttp 完成后续的请求操作，在服务端返回数据之后，OkHttp 将原始的结果交给 Retrofit，后者根据用户的需求对结果进行解析的过程。

在Retrofit中， 不管是发送数据或是接收数据, 最基本都是通过OKHttp的RequestBody和ResponseBody来实现，但是通常为了方便，我们在定制协议的时候，不会直接使用原始的RequestBody或是ResponseBody，因此，在Retrofit中，我们就需要对它进行转换。

Converter用于转换数据，例如，请求服务器时，经常会把对象转换成json格式，或者xml，收到服务器返回的文本时，又会需要转换成对象，或者String等。

手动VS自动 （进行数据转换）

BaseResponse

/**
 * Copyright 2021 bejson.com
 */
package com.enjoy.networkdemo.bean;

/**
 * Auto-generated: 2021-02-06 15:44:25
 *
 * @author bejson.com (i@bejson.com)
 * @website http://www.bejson.com/java2pojo/
 */
public class BaseResponse {

    private Data data;
    private int errorCode;
    private String errorMsg;

    public void setData(Data data) {
        this.data = data;
    }

    public Data getData() {
        return data;
    }

    public void setErrorCode(int errorCode) {
        this.errorCode = errorCode;
    }

    public int getErrorCode() {
        return errorCode;
    }

    public void setErrorMsg(String errorMsg) {
        this.errorMsg = errorMsg;
    }

    public String getErrorMsg() {
        return errorMsg;
    }

    @Override
    public String toString() {
        return "BaseResponse{" +
                "data=" + data +
                ", errorCode=" + errorCode +
                ", errorMsg='" + errorMsg + '\\'' +
                '}';
    }
}

Data

/**
 * Copyright 2021 bejson.com
 */
package com.enjoy.networkdemo.bean;

import java.util.List;

/**
 * Auto-generated: 2021-02-06 15:44:25
 *
 * @author bejson.com (i@bejson.com)
 * @website http://www.bejson.com/java2pojo/
 */
public class Data {

    private boolean admin;
    private List<String> chapterTops;
    private int coinCount;
    private List<Integer> collectIds;
    private String email;
    private String icon;
    private long id;
    private String nickname;
    private String password;
    private String publicName;
    private String token;
    private int type;
    private String username;

    public void setAdmin(boolean admin) {
        this.admin = admin;
    }

    public boolean getAdmin() {
        return admin;
    }

    public void setChapterTops(List<String> chapterTops) {
        this.chapterTops = chapterTops;
    }

    public List<String> getChapterTops() {
        return chapterTops;
    }

    public void setCoinCount(int coinCount) {
        this.coinCount = coinCount;
    }

    public int getCoinCount() {
        return coinCount;
    }

    public void setCollectIds(List<Integer> collectIds) {
        this.collectIds = collectIds;
    }

    public List<Integer> getCollectIds() {
        return collectIds;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public String getEmail() {
        return email;
    }

    public void setIcon(String icon) {
        this.icon = icon;
    }

    public String getIcon() {
        return icon;
    }

    public void setId(long id) {
        this.id = id;
    }

    public long getId() {
        return id;
    }

    public void setNickname(String nickname) {
        this.nickname = nickname;
    }

    public String getNickname() {
        return nickname;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public String getPassword() {
        return password;
    }

    public void setPublicName(String publicName) {
        this.publicName = publicName;
    }

    public String getPublicName() {
        return publicName;
    }

    public void setToken(String token) {
        this.token = token;
    }

    public String getToken() {
        return token;
    }

    public void setType(int type) {
        this.type = type;
    }

    public int getType() {
        return type;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getUsername() {
        return username;
    }

    @Override
    public String toString() {
        return "Data{" +
                "admin=" + admin +
                ", chapterTops=" + chapterTops +
                ", coinCount=" + coinCount +
                ", collectIds=" + collectIds +
                ", email='" + email + '\\'' +
                ", icon='" + icon + '\\'' +
                ", id=" + id +
                ", nickname='" + nickname + '\\'' +
                ", password='" + password + '\\'' +
                ", publicName='" + publicName + '\\'' +
                ", token='" + token + '\\'' +
                ", type=" + type +
                ", username='" + username + '\\'' +
                '}';
    }
}

WanandroidService

package com.enjoy.networkdemo;


import okhttp3.ResponseBody;
import retrofit2.Call;
import retrofit2.http.Field;
import retrofit2.http.FormUrlEncoded;
import retrofit2.http.GET;
import retrofit2.http.POST;

public interface WanAndroidService {

    @POST("user/login")
    @FormUrlEncoded
    Call<ResponseBody> login(@Field("username") String username, @Field("password") String pwd);
}

WanAndroidService2

package com.enjoy.networkdemo;


import com.enjoy.networkdemo.bean.BaseResponse;

import io.reactivex.rxjava3.core.Flowable;
import okhttp3.ResponseBody;
import retrofit2.Call;
import retrofit2.http.Field;
import retrofit2.http.FormUrlEncoded;
import retrofit2.http.GET;
import retrofit2.http.POST;
import retrofit2.http.Path;

public interface WanAndroidService2 {

    @POST("user/login")
    @FormUrlEncoded
    Call<BaseResponse> login(@Field("username") String username, @Field("password") String pwd);

    @POST("user/login")
    @FormUrlEncoded
    Flowable<BaseResponse> login2(@Field("username") String username, @Field("password") String pwd);


    @GET("lg/collect/list/{pageNum}/json")
    Flowable<ResponseBody> getArticle(@Path("pageNum") int pageNum);
}

WanAndroidUnitTest

package com.enjoy.networkdemo.retrofit;

import com.enjoy.networkdemo.CookieUnitTest;
import com.enjoy.networkdemo.HttpbinService;
import com.enjoy.networkdemo.WanAndroidService;
import com.enjoy.networkdemo.WanAndroidService2;
import com.enjoy.networkdemo.bean.BaseResponse;
import com.google.gson.Gson;

import org.jetbrains.annotations.NotNull;
import org.junit.Test;
import org.reactivestreams.Publisher;

import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import io.reactivex.rxjava3.android.schedulers.AndroidSchedulers;
import io.reactivex.rxjava3.core.Flowable;
import io.reactivex.rxjava3.core.Scheduler;
import io.reactivex.rxjava3.functions.Consumer;
import io.reactivex.rxjava3.functions.Function;
import io.reactivex.rxjava3.schedulers.Schedulers;
import okhttp3.Cookie;
import okhttp3.CookieJar;
import okhttp3.HttpUrl;
import okhttp3.OkHttpClient;
import okhttp3.RequestBody;
import okhttp3.ResponseBody;
import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;
import retrofit2.Retrofit;
import retrofit2.adapter.rxjava3.RxJava3CallAdapterFactory;
import retrofit2.converter.gson.GsonConverterFactory;

public class WanAndroidUnitTest {
    Retrofit retrofit = new Retrofit.Builder().baseUrl("https://www.wanandroid.com/").build();
    WanAndroidService wanAndroidService = retrofit.create(WanAndroidService.class);

    @Test
    public void loginTest() throws IOException {
        Call<ResponseBody> call =
                wanAndroidService.login("lanceedu", "123123");
        Response<ResponseBody> response = call.execute();
        String result = response.body().string();
        System.out.println(result);
        //手动进行数据转换
        BaseResponse baseResponse = new Gson().fromJson(result, BaseResponse.class);
        System.out.println(baseResponse);
    }
     //自动进行数据转换
    Retrofit retrofit2 = new Retrofit.Builder()
            .baseUrl("https://www.wanandroid.com/")
            .addConverterFactory(GsonConverterFactory.create()) //添加转换器
            .build();
    WanAndroidService2 wanAndroidService2 = retrofit2.create(WanAndroidService2.class);

    @Test
    public void loginConvertTest() throws IOException {
        Call<BaseResponse> call = wanAndroidService2.login("lanceedu", "123123");
        Response<BaseResponse> response = call.execute();
        BaseResponse baseResponse = response.body();
        System.out.println(baseResponse);
    }
}

输出

{"data":{"admin":false,"chapterTops":[],"coinCount":0,"collectIds":[17188,18965],"email":"","icon":"","id":86459,"nickname":"lanceedu","password":"","publicName":"lanceedu","token":"","type":0,"username":"lanceedu"},"errorCode":0,"errorMsg":""}
BaseResponse{data=Data{admin=false, chapterTops=[], coinCount=0, collectIds=[17188, 18965], email='', icon='', id=86459, nickname='lanceedu', password='', publicName='lanceedu', token='', type=0, username='lanceedu'}, errorCode=0, errorMsg=''}

Process finished with exit code 0

参考

1、Retrofit之Converter简单解析

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