Retrofit2 + OkHttp3设置Http请求头(Headers)方法汇总

Posted 2020-08-02 一起学习_Program

在构建网络层时会遇到一个问题就是要手动配置Http请求的Headers，写入缓存Cookie，自定义的User-Agent等参数，但是对于有几十个接口的网络层，我才不想用注解配置Headers，目前网上很多文章的方法真对这两个版本都不是很适用，有的给出的方法已经被删除，有的方法会报出异常 :(

方法一：

在翻阅官方API文档整理后的方法如下：

1.  import okhttp3.Interceptor;  

2.  import okhttp3.OkHttpClient;  

3.  import okhttp3.Request;  

4.  import okhttp3.Response;  

5.  import retrofit2.Retrofit;  

6.    

7.  public class RetrofitAPIManager {  

8.    

9.      public static final String SERVER_URL = "url";  

10.   

11.     public static ClientAPI provideClientApi() {  

12.         Retrofit retrofit = new Retrofit.Builder()  

13.                 .baseUrl(SERVER_URL)  

14.                 .client(genericClient())  

15.                 .build();  

16.         return retrofit.create(ClientAPI.class);  

17.     }  

18.   

19.   

20.     public static OkHttpClient genericClient() {  

21.         OkHttpClient httpClient = new OkHttpClient.Builder()  

22.                 .addInterceptor(new Interceptor() {  

23.                     @Override  

24.                     public Response intercept(Chain chain) throws IOException {  

25.                         Request request = chain.request()  

26.                                 .newBuilder()  

27.                                 .addHeader("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8")  

28.                                 .addHeader("Accept-Encoding", "gzip, deflate")  

29.                                 .addHeader("Connection", "keep-alive")  

30.                                 .addHeader("Accept", "*/*")  

31.                                 .addHeader("Cookie", "add cookies here")  

32.                                 .build();  

33.                         return chain.proceed(request);  

34.                     }  

35.   

36.                 })  

37.                 .build();  

38.   

39.         return httpClient;  

40.     }  

41. }  

使用Interceptor来拦截并重新设置请求头，测试可用

•  List<Interceptor>  interceptors()方法，返回的是一个不可编辑的列表，如果对其进行编辑会报出UnSupportedOperationException
• Interceptor的典型使用场景，就是对request和response的Headers进行编辑

方法二.、

OkHttpClient okHttpClient = new OkHttpClient.Builder()
                .cookieJar(new CookieJar() {
                    private final HashMap<HttpUrl, List<Cookie>> cookieStore = new HashMap<>();
                    @Override
                    public void saveFromResponse(HttpUrl httpUrl, List<Cookie> list) {
                        cookieStore.put(httpUrl, list);
                    }

                    @Override
                    public List<Cookie> loadForRequest(HttpUrl httpUrl) {
                        List<Cookie> cookies = cookieStore.get(httpUrl);
                        return cookies != null ? cookies : new ArrayList<Cookie>();
                    }
                }).build();

 

方法三、

 

Request request = new Request.Builder()
                .url(PATH)
                .post(body)
                //取出本地保存的sessionId
                .addHeader("Cookie", "sessionId")
                .build();
        Call call = mOkHttpClient.newCall(request);
        call.enqueue(new Callback() {
            @Override
            public void onFailure(Call call, IOException e) {

            }

            @Override
            public void onResponse(Call call, Response response) throws IOException {
               if (response.isSuccessful()){
                   Headers headers = response.headers();
                   List<String> cookies = headers.values("Set-Cookie");
                   Log.d(TAG, "onResponse: "+cookies.size());
                   for (String str:cookies){
                       if (str.startsWith("phpSESSID")){
                           //将sessionId保存到本地
                           Log.d(TAG, "onResponse: "+str.split(";")[0]);
                       }
                   }

               }
            }
        });

来自为知笔记(Wiz)