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Retrofit概念

Retrofit 是一个 RESTful 的 HTTP 网络请求框架的封装,网络请求的工作本质上是 OkHttp 完成,而 Retrofit 仅负责 网络请求接口的封装。

Retrofit框架网络请求流程图: image.png

一、与安卓集成

1. 添加依赖

build.gradle下添加:其中第一个为添加retrofit,第二及第三个为添加json解析,这里采用的是GSON

implementation 'com.squareup.retrofit2:retrofit:2.1.0'
implementation 'com.squareup.retrofit2:converter-gson:2.0.2'
implementation 'com.google.code.gson:gson:2.7'
implementation 'com.squareup.okhttp3:okhttp:3.2.0'
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2. 加入 OkHttp 配置
         // 创建 OKHttpClient
        OkHttpClient.Builder builder = new OkHttpClient.Builder();
        builder.connectTimeout(1000*60, TimeUnit.SECONDS);//连接超时时间
        builder.writeTimeout(1000*60,TimeUnit.SECONDS);//写操作 超时时间
        builder.readTimeout(1000*60,TimeUnit.SECONDS);//读操作超时时间
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3. 加入 retrofit 配置
        ApiConfig.BASE_URL = "https://wanandroid.com/";
        // 创建 OKHttpClient
        OkHttpClient.Builder httpBuilder = new OkHttpClient.Builder();
        httpBuilder.connectTimeout(1000*60, TimeUnit.SECONDS);//连接超时时间
        httpBuilder.writeTimeout(1000*60,TimeUnit.SECONDS);//写操作 超时时间
        httpBuilder.readTimeout(1000*60,TimeUnit.SECONDS);//读操作超时时间
        
        // 创建Retrofit
       mRetrofit = new Retrofit.Builder() 
       .client(httpBuilder.build()) 
       .addConverterFactory(GsonConverterFactory.create()) 
       .baseUrl(ApiConfig.BASE_URL) 
       .build();
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4. 定义HTTP的API对应的接口:

 public interface ApiService {
 
   @GET("wenda/comments/{questionId}/json") 
   Call<CommentResponse> getWendaList(@Path("questionId") String questionId); 
}
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上面的接口定义就会调用服务端URL为wanandroid.com/wenda/comme… 需返回定义好对象

返回对象定义

public class CommentResponse {

    private Integer errorCode;

    private String errorMsg;

    private CommentBean date;

}

public class CommentBean {
    private int total;

    private int size;

    private List<CommentData> datas;

     class CommentData{

         private int articleId;
         private boolean canEdit;
         private String content;
         private int id;
         private String niceDate;
         private Date publishDate;
         private int rootCommentId;
         private int status;
         private int toUserId;
         private String toUserName;
         private int userId;
         private String userName;
         private int zan;
    }
}


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5. 请求接口

Call对象有两个请求方法: 1.Enqueue异步请求方法; 2.Exectue同步请求方法

异步请求:
 public void postAsnHttp(){
       ApiService httpList = mRetrofit.create(ApiService.class);
       调用实现的方法来进行同步或异步的HTTP请求:
       Call<CommentResponse> wendaList = httpList.getWendaList("14500");
       wendaList.enqueue(new Callback<CommentResponse>() {
           @Override
           public void onResponse(Call<Map<Object, Object>> call, Response<CommentResponse> response) {
               Log.i("111111","onResponse:"+response.body().toString());
           }

           @Override
           public void onFailure(Call<Map<Object, Object>> call, Throwable t) {


           }
       });
   }
}

同步请求

try { 
     //同步请求 
    Response<CommentResponse> response = call1.execute(); 
    If (response.isSuccessful()) { 
         Log.d("Retrofit2Example", response.body().getDesc()); 
    } 
} catch (IOException e) {
    e.printStackTrace();
} 



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