okhttp传递数组参数

采用okhttp+rxjava+retrofit向后台传递字符串数组参数,格式以下

{
    "list": ["xxx","yyy"]//value是个字符串数组
}

最初定义了一个

List<String> list = new ArrayList<>();

而后转成字符串

String str =  list.toString();

可是这样获得的结果是

{
    "list": "["xxx","yyy"]"//value变成了字符串
}

比较以上两种格式,发现格式不对.传给后台时,老是报参数错误的异常.

解决办法:定义一个对象继承自okhttp3.RequestBody

public class DefaultRequestBody extends okhttp3.RequestBody{
    public List<String> list;
    @Nullable
    @Override
    public MediaType contentType() {
        return MediaType.parse("application/json; charset=utf-8");
    }

    @Override
    public void writeTo(BufferedSink sink) throws IOException {

    }
}

经过Retrofit定义请求接口API

@FormUrlEncoded
@POST("url")
Observable<BaseResult> request(@body DefaultRequestBody body);

打开PostMan,输入url,输入请求参数,选择Body,选择raw,选择JSON(application/json)

输入json格式的参数,点击右侧的[code]查看,选择[java ok http],如图

关键的代码:

MediaType mediaType = MediaType.parse("application/json");
    RequestBody body = RequestBody
    .create(mediaType, "{"list":    ["xxx","yyy"]}");

create方法的第二个参数就是咱们的对象DefaultRequestBody转换后的json字符串.

//Gson转换自动处理了字符串数组,不会出现上面那种value格式错误
String json = new org.google.Gson().toJson(new DefaultRequestBody());

上面定义的接口request API中传入的是对象DefaultRequestBody,咱们在okHttp的拦截器里作转换

public class DefaultIntercept extends okhttp3.Intercept{
         @Override
        public Response intercept(Chain chain) throws IOException {
            Request request = chain.request();
            RequestBody requestBody = request.body();
            if(requestBody instanceof DefaultRequestBody){
                DefaultRequestBody defaultBody = (DefaultRequestBody)requestBody;
                String json = new Gson().toJson(defaultBody);
                MediaType mediaType = MediaType.parse("application/json");
                //生成RequestBody
                RequestBody body = RequestBody.create(mediaType,json);
                //传递body,从新生成request请求
                request = request.newBuilder().post(body).build();
            }
            return chain.proceed(request);
        } 
    }

解决了传递字符串数组的问题