//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builder
for (String key : map.keySet()) {
      builder.addFormDataPart(key, map.get(key));
    }
  //遍歷paths中所有圖片絕對(duì)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(qǐng)求體
    RequestBody requestBody = builder.build();
 //構(gòu)建請(qǐng)求
 Request request = new Request.Builder()
        .url(url)//地址
        .post(requestBody)//添加請(qǐng)求體
        .build(); 
//發(fā)送異步請(qǐng)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());
             }
    });