Retrofit2 + OkHttp3设置Http请求头(Headers)方法汇总 - 一起学习—编程 - 博客园

安宇雨 - 随手采集
2021-12-23 19:24:25
随手采集
0000-未整理-等待研究

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：

import okhttp3.Interceptor;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;
import retrofit2.Retrofit;
publicclass RetrofitAPIManager {
publicstaticfinal String SERVER_URL = "url";
publicstatic ClientAPI provideClientApi() {
Retrofit retrofit = new Retrofit.Builder()
.baseUrl(SERVER_URL)
.client(genericClient())
.build();
return retrofit.create(ClientAPI.class);
}
publicstatic OkHttpClient genericClient() {
OkHttpClient httpClient = new OkHttpClient.Builder()
.addInterceptor(new Interceptor() {
@Override
public Response intercept(Chain chain) throws IOException {
Request request = chain.request()
.newBuilder()
.addHeader("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8")
.addHeader("Accept-Encoding", "gzip, deflate")
.addHeader("Connection", "keep-alive")
.addHeader("Accept", "/")
.addHeader("Cookie", "add cookies here")
.build();
return chain.proceed(request);
}
})
.build();
return httpClient;
}
}

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]);
                       }
                   }

               }
            }
        });

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原网址: 访问
创建于: 2021-12-23 19:24:25
目录: default
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