layout: post

title: '如何使用okHttp拦截器统一解密（1）'

subtitle: '转载请注明出处'

date: 2019-08-30

categories: Android okHttp3

cover: 'http://bpic.588ku.com/back_pic/05/56/83/235b206f30d6d48.jpg'

tags: Android okHttp3

自定义拦截器可以先客户端一步拿到每一次 Http 请求的结果做一些额外处理

example：解密、token过期后重新请求等

public class ResponseInterceptor implements Interceptor {
    private static final String TAG = "ResponseInterceptor";

    @Override
    public Response intercept(Chain chain) throws IOException {
        //返回request
        Request request = chain.request();
        //返回response
        Response response = chain.proceed(request);
        //isSuccessful () ; 如果代码在[200..300]中，则返回true，这意味着请求已成功接收、理解和接受。
        if (response.isSuccessful()) {
            //返回ResponseBody
            ResponseBody responseBody = response.body();
            if (responseBody != null) {
                try {
                    //获取bodyString
                    BufferedSource source = responseBody.source();
                    source.request(Long.MAX_VALUE);
                    Buffer buffer = source.buffer();
                    Charset charset = Charset.forName("UTF-8");
                    MediaType contentType = responseBody.contentType();
                    if (contentType != null) {
                        charset = contentType.charset(charset);
                    }
                    String bodyString = buffer.clone().readString(charset);
                    //我这里是base64解码  具体情况自己定义
                    //base64解码
                    String responseData = new String(EncodeUtils.base64Decode(bodyString));
                    //生成新的ResponseBody
                    ResponseBody newResponseBody = ResponseBody.create(contentType, responseData.trim());
                    //response
                    response = response.newBuilder().body(newResponseBody).build();
                     Log.i(TAG, "解密后数据: " + responseData);

                } catch (IOException e) {
                    //如果发生异常直接返回
                    e.printStackTrace();
                    return response;
                }
            } else {
                Log.i(TAG, "onHttpResultResponse: 响应体为空");
            }
        }
        return response;
    }

}