android Retrofit2 返回json客户端与服务端加密通信

深藏阁楼爱情的钟 2022-12-12 02:18 265阅读 0赞

### 对response进行解密，retrofit设置自定义的ConverterFactory，因客户端与服务端使用json通信，因此我们参考官方提供GsonConverterFactory编写 ###

Retrofit retrofit = new Retrofit.Builder()
                    .client(getOkHttpClient())
                    .addConverterFactory(CustomGsonConverterFactory.create())
                    .baseUrl(BASE_URL)
                    .build();

class CustomGsonResponseConverter<T> implements Converter<ResponseBody, T> {
    
        private final Gson gson;
        private final TypeAdapter<T> adapter;
    
        CustomGsonResponseConverter(Gson gson, TypeAdapter<T> adapter) {
            this.gson = gson;
            this.adapter = adapter;
        }
    
        @Override
        public T convert(ResponseBody value) throws IOException {
            try {
                String originalBody = value.string();
                // 解密
                String body = EncryptUtils.decryptParams(originalBody);
                // 获取json中的code，对json进行预处理
                JSONObject json = new JSONObject(body);
                int code = json.optInt("code");
                // 当code不为0时，设置data为{}，这样转化就不会出错了
                if (code != 0) {
                    json.put("data", new JSONObject());
                    body = json.toString();
                }
    
                return adapter.fromJson(body);
            } catch (Exception e) {
                throw new RuntimeException(e.getMessage());
            } finally {
                value.close();
            }
        }

class GsonRequestBodyConverter<T> implements Converter<T, RequestBody> {
      private static final MediaType MEDIA_TYPE = MediaType.parse("application/json; charset=UTF-8");
      private static final Charset UTF_8 = Charset.forName("UTF-8");
    
      private final Gson gson;
      private final TypeAdapter<T> adapter;
    
      GsonRequestBodyConverter(Gson gson, TypeAdapter<T> adapter) {
        this.gson = gson;
        this.adapter = adapter;
      }
    
      @Override public RequestBody convert(T value) throws IOException {
        Buffer buffer = new Buffer();
        Writer writer = new OutputStreamWriter(buffer.outputStream(), UTF_8);
        JsonWriter jsonWriter = gson.newJsonWriter(writer);
        adapter.write(jsonWriter, value);
        jsonWriter.close();
        return RequestBody.create(MEDIA_TYPE, buffer.readByteString());
      }
    }

![e96e2b4234d18dd3f811107b7c9b4258.png][]  
借鉴原文https://blog.csdn.net/weixin\_43901866/article/details/86578148

[e96e2b4234d18dd3f811107b7c9b4258.png]: /images/20221123/2e23aa7dc1d44d9395c25ab96d1f2b1d.png