我有一个API，它有一个String类型的有效负载主体。但是json和image（多方/表格）作为有效负载主体的一部分。像这样：
json={jsonbody} image=@images/testing.png
这就是我目前正在做的事情
public static String uploadImageQuery(Context context, String urlString, String method,
JSONObject jsonObject, Bitmap largeImageBitmap,
Dialog dialog) throws IOException {
String responseString = null;
HttpURLConnection conn = null;
URL url = new URL(urlString);
conn = (HttpURLConnection) url.openConnection();
Log.d(TAG, "Uploading largeImageBitmap ..");
conn.setConnectTimeout((int) Constants.THREE_MINUTES);
conn.setDoOutput(true);
conn.setDoInput(true);
conn.setUseCaches(false);
conn.setRequestMethod(method);
conn.setChunkedStreamingMode(16 * 1024);
conn.setRequestProperty("Transfer-Encoding", "chunked");
// The “boundry” can be any string. In this example it’s **********.
// It’s used in the body of the request to seperate each field being submitted.
//conn.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + BOUNDARY);
conn.setRequestProperty("Authorization", "Bearer " + access_token);
conn.connect();
DataOutputStream dataOS = new DataOutputStream(conn.getOutputStream());
dataOS.write(("json=" + jsonObject.toString()).getBytes(Constants.CHARSET_UTF_8));
dataOS.write(("image=").getBytes(Constants.CHARSET_UTF_8));
/* Standard order patten for sending multipart data*/
dataOS.write(buildStartPayload().getBytes(Constants.CHARSET_UTF_8));
dataOS.write(getImageBytes(largeImageBitmap));
dataOS.write(buildEndPayload().getBytes(Constants.CHARSET_UTF_8));
Log.d(TAG, "Posting String data to server : " + dataOS.toString());
dataOS.flush();
dataOS.close();
// Ensure we got the HTTP 200 response code
int responseCode = conn.getResponseCode();
String responseMessage = conn.getResponseMessage();
Log.d(TAG, "Response code for upload image query : " + responseCode + " Message : " + responseMessage);
if (responseCode != 200) {
dialog.cancel();
Log.e(TAG, String.format("Received the response code %d from the URL %s", responseCode, url));
// DisplayMessage.error("Couldn't upload image. Please try again later.", activity);
}
// Read the response
InputStream is = conn.getInputStream();
ByteArrayOutputStream baos = new ByteArrayOutputStream();
byte[] bytes = new byte[1024];
int bytesRead;
while ((bytesRead = is.read(bytes)) != -1) {
baos.write(bytes, 0, bytesRead);
}
byte[] bytesReceived = baos.toByteArray();
baos.close();
is.close();
String response = new String(bytesReceived);
Log.d(TAG, "Response:" + response);
conn.disconnect();
conn = null;
Log.d(TAG, "Cleard the connection handle.");
return responseString;
}
private static String buildStartPayload() {
String contentDisposition = "Content-Disposition: form-data; name=\"testing\"; filename=\"testing.png\"";
String contentType = "Content-Type: image/png";
// This is the standard format for a multipart request
StringBuilder requestBody = new StringBuilder();
requestBody.append(LINE_START);
requestBody.append(BOUNDARY);
requestBody.append(LINE_END);
requestBody.append(contentDisposition);
requestBody.append(LINE_END);
requestBody.append(contentType);
requestBody.append(LINE_END);
requestBody.append(LINE_END);
return requestBody.toString();
}
private static String buildEndPayload() {
// This is the standard format for a multipart request
StringBuilder requestBody = new StringBuilder();
requestBody.append(LINE_END + LINE_START + BOUNDARY + LINE_START + LINE_END);
return requestBody.toString();
}
我之前使用HttpURLConnection发布了一个多部分/表单图片，并尝试使用DataOutputform进行操作，但我收到了一个＆＃34;错误请求＆＃34;错误。有图书馆可以提供帮助吗？我使用凌空初级，但它没有良好的图像支持。我没有尝试过Retrofit但是现在不想去那里。我希望可以使用HttpURLConnection完成此操作。
答案 0 :(得分：0)
您可能需要将图像编码为字符串，然后将字符串放入您的请求正文中。
如果你正在使用凌空，你可以试试这个：
StringRequest stringRequest = new StringRequest(Request.Method.POST, URL, new Response
.Listener<String>() {
@Override
public void onResponse(String response) {
Log.d(TAG, "onResponse() called with: response = [" + response + "]");
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Log.d(TAG, "onErrorResponse() called with: error = [" + error + "]");
}
}) {
@Override
protected Map<String, String> getParams() throws AuthFailureError {
Map<String, String> params = new HashMap<>();
params.put("img", BASE64_IMG);
return params;
}
};
mRequestQueue.add(stringRequest);
覆盖getParams并将你的参数放入你的请求中。
您必须使用 Base64 将图像编码为字符串。
答案 1 :(得分：0)
您可以使用此库链接click here..
compile "cz.msebera.android:httpclient:4.4.1.2"
添加图片的代码
protected String doInBackground(Void... params) {
String result = "";
try {
HttpClient client = new DefaultHttpClient();
HttpPost post = new HttpPost("your url");
post.setHeader("key", Key_for_XYZ);
MultipartEntityBuilder entityBuilder = MultipartEntityBuilder.create();
entityBuilder.setMode(HttpMultipartMode.BROWSER_COMPATIBLE);
entityBuilder.addTextBody("id", id);
entityBuilder.addTextBody("name", fnm);
// file path.....
entityBuilder.addBinaryBody("uploaded_file", destination);
cz.msebera.android.httpclient.HttpEntity entity = entityBuilder.build();
post.setEntity(entity);
cz.msebera.android.httpclient.HttpResponse response = client.execute(post);
cz.msebera.android.httpclient.HttpEntity httpEntity = response.getEntity();
result = EntityUtils.toString(httpEntity);
Log.e("result", result);
} catch (Exception e) {
e.printStackTrace();
}
return result;
}
//确保您已导入此包...
import cz.msebera.android.httpclient.client.HttpClient;
import cz.msebera.android.httpclient.client.methods.HttpPost;
import cz.msebera.android.httpclient.entity.mime.HttpMultipartMode;
import cz.msebera.android.httpclient.entity.mime.MultipartEntityBuilder;
import cz.msebera.android.httpclient.impl.client.DefaultHttpClient;
import cz.msebera.android.httpclient.util.EntityUtils;