//參數(shù)類型private static final MediaType MEDIA_TYPE_PNG = MediaType.parse("image/png");//創(chuàng)建OkHttpClient實(shí)例private final OkHttpClient client = new OkHttpClient();MultipartBuilder builder = new MultipartBuilder().type(MultipartBuilder.FORM);//遍歷map中所有參數(shù)到builderfor (String key : map.keySet()) {      builder.addFormDataPart(key, map.get(key));    }  //遍歷paths中所有圖片絕對路徑到builder，并約定key如“upload”作為后臺(tái)接受多張圖片的key    for (String path : paths) {      builder.addFormDataPart("upload", null, RequestBody.create(MEDIA_TYPE_PNG, new File(path)));    }   //構(gòu)建請求體    RequestBody requestBody = builder.build(); //構(gòu)建請求 Request request = new Request.Builder()        .url(url)//地址        .post(requestBody)//添加請求體        .build(); //發(fā)送異步請求，同步會(huì)報(bào)錯(cuò)，Android4.0以后禁止在主線程中進(jìn)行耗時(shí)操作client.newCall(request).enqueue(new Callback() {      @Override      public void onFailure(Request request, IOException e) {        System.out.println("request = " + request.urlString());        System.out.println("e.getLocalizedMessage() = " + e.getLocalizedMessage())；      }      @Override      public void onResponse(Response response) throws IOException {        //看清楚是response.body().string()不是response.body().toString()             System.out.println("response = " + response.body().string());             }    });