Android凌空上传图片

Question

我正在制作一个应用程序，我必须使用Volley上传图片。我试图谷歌，但没有发现类似的东西。如何使用Volley发布图像时多部分上传图像并添加参数，如user_id？

使用Retrofit不适用于我的情况。

Answer 1

首先创建一个文件MultipartRequest如下：

public class MultipartRequest extends Request<String> { 
private MultipartEntityBuilder entity = MultipartEntityBuilder.create(); 
private final Response.Listener<String> mListener; 
private final File file; 
private final HashMap<String, String> params; 

public MultipartRequest(String url, Response.Listener<String> listener, Response.ErrorListener errorListener, File file, HashMap<String, String> params) 
{ 
    super(Method.POST, url, errorListener); 

    mListener = listener; 
    this.file = file; 
    this.params = params; 
    buildMultipartEntity(); 
    buildMultipartEntity2(); 

} 



private void buildMultipartEntity() 
{ 
    entity.addBinaryBody(KEY_IMAGE, file, ContentType.create("image/jpeg"), file.getName()); 
    entity.setMode(HttpMultipartMode.BROWSER_COMPATIBLE); 
    entity.setLaxMode().setBoundary("xx").setCharset(Charset.forName("UTF-8")); 

    try 
    { 
     for (String key : params.keySet()) { 
      entity.addPart(key, new StringBody(params.get(key))); 
     } 
    } 
    catch (UnsupportedEncodingException e) 
    { 
     VolleyLog.e("UnsupportedEncodingException"); 
    } 
} 

@Override 
public String getBodyContentType() 
{ 
    return entity.build().getContentType().getValue(); 
} 
@Override 
public Map<String, String> getHeaders() throws AuthFailureError { 
    Map<String, String> headers = super.getHeaders(); 

    if (headers == null 
      || headers.equals(Collections.emptyMap())) { 
     headers = new HashMap<String, String>(); 
    } 

    headers.put("Accept", "application/json"); 

    return headers; 
} 

@Override 
public byte[] getBody() throws AuthFailureError 
{ 
    ByteArrayOutputStream bos = new ByteArrayOutputStream(); 
    try 
    { 
     entity.build().writeTo(bos); 
    } 
    catch (IOException e) 
    { 
     VolleyLog.e("IOException writing to ByteArrayOutputStream"); 
    } 
    return bos.toByteArray(); 
} 
/** 
* copied from Android StringRequest class 
*/ 
@Override 
protected Response<String> parseNetworkResponse(NetworkResponse response) { 
    String parsed; 
    try { 
     parsed = new String(response.data, HttpHeaderParser.parseCharset(response.headers)); 
    } catch (UnsupportedEncodingException e) { 
     parsed = new String(response.data); 
    } 
    return Response.success(parsed, HttpHeaderParser.parseCacheHeaders(response)); 
} 

@Override 
protected void deliverResponse(String response) { 
    mListener.onResponse(response); 
}} 

在你的活动只是让multipart请求信息如下：

public void uploadImage() 
{ 
    try { 
     pDialog = new ProgressDialog(getActivity()); 
     pDialog.setMessage("Loading..."); 
     pDialog.show(); 

      HashMap params = new HashMap<String, String>(); 

      params.put(KEY_NAME, name); 
     MultipartRequest sr = new MultipartRequest(UPLOAD_URL, new Response.Listener<String>() { 

      @Override 
      public void onResponse(String response) { 
       if ((pDialog != null) && pDialog.isShowing()) { 
        pDialog.dismiss(); 
       } 
       Log.d("file", f + ""); 
       Log.d("", ".......response====" + response.toString()); 

       //////// 
       try { 
        JSONObject object = new JSONObject(response); 
        String serverCode = object.getString("code"); 
        if (serverCode.equalsIgnoreCase("0")) { 

        } 
        if (serverCode.equalsIgnoreCase("1")) { 
         try { 

          if ("1".equals(serverCode)) { 
           JSONObject object1 = object.getJSONObject("data"); 

          } 
         } 

Answer 2

使用改造2：

您需要使用OkHttp的RequestBody类，并将您的文件封装到请求正文（表示您的用户标识）。
1）创建界面

public interface FileUploadService { 
    @Multipart 
    @POST("/upload") 
    Call<String> upload(
      @Part("myfile\"; filename=\"image.png\" ") RequestBody file, 
      @Part("userid") RequestBody userid); 
} 

2）在活动代码：

FileUploadService service = 
      ServiceGenerator.createService(FileUploadService.class); 

    String userid = "your_userid"; 
    RequestBody data = 
      RequestBody.create(MediaType.parse("multipart/form-data"), userid); 

    File file = new File("path/to/your/file"); 
    RequestBody requestBody = 
      RequestBody.create(MediaType.parse("multipart/form-data"), file); 

    Call<String> call = service.upload(requestBody, data); 
    call.enqueue(new Callback<String>() { 
     @Override 
     public void onResponse(Call<String> call, Response<String> response) { 
      Log.v("Upload", "success"); 
     } 

     @Override 
     public void onFailure(Call<String> call, Throwable t) { 
      Log.e("Upload", t.getMessage()); 
     } 
    });  

参考链接：https://futurestud.io/blog/retrofit-2-how-to-upload-files-to-server