Retrofit 2 在拦截中将 post 附加到 requestbody

Question

我有这个：

OkHttpClient client = new OkHttpClient();
client.interceptors().add(new Interceptor() {
    @Override
    public com.squareup.okhttp.Response intercept(Chain chain) throws IOException {
        Request request = chain.request();
        HttpUrl url = request.httpUrl().newBuilder()
                     .addQueryParameter("platform", "android")
                     .addQueryParameter("app_version", com.package.BuildConfig.VERSION_NAME)
                     .build();
        Request newRequest = chain.request().newBuilder().url(url).build();
        return chain.proceed(newRequest);
    }
});

但还想向包含用户密钥的请求正文附加一个额外的 post 键值。这看起来像

    RequestBody newBody = RequestBody.create(request.body().contentType(),request.body().content+ request.addPost("sUserKey","3254345kdskf");
...
...
 Request newRequest = chain.request()
.newBuilder()
.url(url)
.post(newBody)
.build();

Answer 1

附加到 RequestBody 不是直截了当的。这是将添加 post 参数的自定义 RequestBody 的草图。几个注意事项——您需要添加一些错误检查，例如确保现有正文不为空。给定的代码还假定所有对该拦截器的调用都是 POST。如果不是这种情况，您需要在应用新主体之前检查传入的请求类型。此外，由于这只是将新参数复制到正文中，因此如果需要，您需要确保名称和正文已经 url 编码。

class AddPostParamRequestBody extends RequestBody {

    final RequestBody body;
    final String parameter;

    AddPostParamRequestBody(RequestBody body, String name, String value) {
        this.body = body;
        this.parameter = "&" + name + "=" + value;
    }

    @Override
    public long contentLength() throws IOException {
        return body.contentLength() + parameter.length();
    }

    @Override
    public MediaType contentType() {
        return body.contentType();
    }

    @Override
    public void writeTo(BufferedSink bufferedSink) throws IOException {
        body.writeTo(bufferedSink);
        bufferedSink.writeString(parameter, Charset.forName("UTF-8"));
    }

}

然后你可以在你的拦截器中使用 --

client.interceptors().add(new Interceptor() {
    @Override
    public com.squareup.okhttp.Response intercept(Chain chain) throws IOException {
        Request request = chain.request();
        HttpUrl url = request.httpUrl().newBuilder().addQueryParameter("added", "param").build();
        AddPostParamRequestBody newBody = new AddPostParamRequestBody(request.body(), "sUserKey","3254345kdskf");
        Request newRequest = request.newBuilder().post(newBody).url(url).build();
        return chain.proceed(newRequest);
    }
});

你的另一个选择是在你的改造定义中包含一个额外的 Field 注释并在每次调用时传递它，但我假设你试图避免这种情况。

Answer 2

无需创建额外的 class。

client.interceptors().add(new Interceptor() {
    @Override
    public com.squareup.okhttp.Response intercept(Chain chain) throws IOException {
        Request request = chain.request();
        String parameter = "&" + name + "=" + value;
        Request newRequest = interceptRequest(request, parameter)
        return chain.proceed(newRequest);
    }
});

这是创建新请求的简单方法。

 public static Request interceptRequest(@NotNull Request request, @NotNull String parameter)
            throws IOException {

        ByteArrayOutputStream baos = new ByteArrayOutputStream();

        Sink sink = Okio.sink(baos);
        BufferedSink bufferedSink = Okio.buffer(sink);

        /**
         * Write old params
         * */
        request.body().writeTo(bufferedSink);

        /**
         * write to buffer additional params
         * */
        bufferedSink.writeString(parameter, Charset.defaultCharset());

        RequestBody newRequestBody = RequestBody.create(
                request.body().contentType(),
                bufferedSink.buffer().readUtf8()
        );

        return request.newBuilder().post(newRequestBody).build();
    }

也可以从Gist

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Retrofit 2 在拦截中将 post 附加到 requestbody

Retrofit 2 appending post to requestbody in intercept

android

retrofit

okhttp