【Android】Retrofit的使用(2)-使用Retrofit提交JSON数据

来源：互联网发布：武汉软件职业技术学院编辑：程序博客网时间：2024/04/28 17:07

在公司的实际项目需求中，我们请求网络接口很多已经脱离简单的post与get方法，采用json的数据格式以流的形式来进行上传，那么怎么用Retrofit去实现呢？

1.首先我们需要创建一个ConverterFactory类，通过它来对请求数据与接收数进行装换

public final class JsonConverterFactory extends Converter.Factory {private JSONObject jsonObject;public static JsonConverterFactory create() {    return create(new JSONObject());}private static JsonConverterFactory create(JSONObject jsonObject) {return new JsonConverterFactory(jsonObject);}private JsonConverterFactory(JSONObject jsonObject) {if (jsonObject == null)throw new NullPointerException("json == null");this.jsonObject = jsonObject;}@Overridepublic Converter<ResponseBody, ?> fromResponseBody(Type type, Annotation[] annotations) {return new JsonResponseBodyConverter<>(jsonObject);}@Override public Converter<?, RequestBody> toRequestBody(Type type, Annotation[] annotations) {return new JsonRequestBodyConverter<>(jsonObject);}}

2.JsonRequestBodyConverter类

/** * Created by ccwant on 2016/8/19. */final class JsonRequestBodyConverter<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 JSONObject jsonObject;JsonRequestBodyConverter(JSONObject jsonObject) {this.jsonObject=jsonObject;}@Overridepublic RequestBody convert(T value) throws IOException {Buffer buffer = new Buffer();Writer writer = new OutputStreamWriter(buffer.outputStream(), UTF_8);Log.d("123","提交数据:"+value.toString());writer.write(value.toString());writer.close();return RequestBody.create(MEDIA_TYPE, buffer.readByteString());}}

3.JsonResponseBodyConverter类

/** * Created by ccwant on 2016/8/19. */final class JsonResponseBodyConverter<T> implements Converter<ResponseBody, T> {private JSONObject jsonObject;JsonResponseBodyConverter(JSONObject jsonObject) {}@Overridepublic T convert(ResponseBody value) throws IOException {BufferedReader br=new BufferedReader(value.charStream());String line="";StringBuffer buffer = new StringBuffer();while((line=br.readLine())!=null){buffer.append(line);}//buffer.toString()Log.d("123","接收数据:"+buffer.toString());try {jsonObject=new JSONObject(buffer.toString());} catch (JSONException e) {e.printStackTrace();}return (T)jsonObject;}}

4.使用方法

在实例化Retrofit的时候

Retrofit retrofit = new Retrofit.Builder()                .baseUrl(url)//传递url                .client(client)                .addConverterFactory(JsonConverterFactory.create())//添加转换器                .build();

在http的service我们这么写

@POST("login.json")Call<JSONObject> login(@Body JSONObject parmas);

在网络请求的回调方法中

call.enqueue(new Callback<JSONObject>() {    @Override    public void onResponse(Response<JSONObject> response, Retrofit retrofit) {    }    @Override    public void onFailure(Throwable t) {    }});

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