我正在使用二手商品销售Android应用程序，我想在服务器上上传多张商品图片。用户最多可以上传4张图片，而至少必须上传一张图片。介于1到4之间，具体取决于用户要上传的图片数量。 现在我的问题是，如何 我可以在一个多部分请求中将多个包含String数据的图像上传到服务器
下面是我的用于将单个图像和字符串数据上传到服务器的代码。
try {
if (selectedImage.equals(null)) {
Toast.makeText(MainActivity.this, "Choose Image First", Toast.LENGTH_LONG).show();
} else {
tvLoad.setVisibility(View.VISIBLE);
Map<String, String> params = new HashMap<String, String>();
params.put("user_id", "34242");
params.put("user_city", "Delhi");
params.put("category", "vehicle");
params.put("subcategory", "car");
params.put("brand", "honda");
params.put("model", "2019");
params.put("fuel", "petrol");
params.put("conditn", "good");
params.put("title", "title");
params.put("description", "description");
params.put("year", "2018");
params.put("kmdriven", "90000");
params.put("price", "100000");
Log.e("abc", " =============" + link);
try {
multipartRequest(link, params, selectedImage + "", "image", "image/jpg");
} catch (Exception e) {
e.printStackTrace();
}
}
}catch (Exception e){
e.printStackTrace();
Toast.makeText(MainActivity.this, "Choose Image First", Toast.LENGTH_LONG).show();
}
public void multipartRequest(String urlTo, Map<String, String>
parmas, String filepath, String filefield, String fileMimeType) throws
Exception {
HttpURLConnection connection = null;
DataOutputStream outputStream = null;
InputStream inputStream = null;
String twoHyphens = "--";
String boundary = "*****" +
Long.toString(System.currentTimeMillis()) + "*****";
String lineEnd = "\r\n";
String result = "";
int bytesRead, bytesAvailable, bufferSize;
byte[] buffer;
int maxBufferSize = 1 * 1024 * 1024;
String[] q = filepath.split("/");
int idx = q.length - 1;
try {
File file = new File(filepath);
FileInputStream fileInputStream = new FileInputStream(file);
URL url = new URL(urlTo);
connection = (HttpURLConnection) url.openConnection();
connection.setDoInput(true);
connection.setDoOutput(true);
connection.setUseCaches(false);
connection.setRequestMethod("POST");
connection.setRequestProperty("Connection", "Keep-Alive");
connection.setRequestProperty("User-Agent", "Android Multipart HTTP Client 1.0");
connection.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + boundary);
outputStream = new DataOutputStream(connection.getOutputStream());
outputStream.writeBytes(twoHyphens + boundary + lineEnd);
outputStream.writeBytes("Content-Disposition: form-data; name=\"" + filefield + "\"; filename=\"" + q[idx] + "\"" + lineEnd);
outputStream.writeBytes("Content-Type: " + fileMimeType + lineEnd);
outputStream.writeBytes("Content-Transfer-Encoding: binary" + lineEnd);
outputStream.writeBytes(lineEnd);
bytesAvailable = fileInputStream.available();
bufferSize = Math.min(bytesAvailable, maxBufferSize);
buffer = new byte[bufferSize];
bytesRead = fileInputStream.read(buffer, 0, bufferSize);
while (bytesRead > 0) {
outputStream.write(buffer, 0, bufferSize);
bytesAvailable = fileInputStream.available();
bufferSize = Math.min(bytesAvailable, maxBufferSize);
bytesRead = fileInputStream.read(buffer, 0, bufferSize);
}
outputStream.writeBytes(lineEnd);
// Upload POST Data
Iterator<String> keys = parmas.keySet().iterator();
while (keys.hasNext()) {
String key = keys.next();
String value = parmas.get(key);
outputStream.writeBytes(twoHyphens + boundary + lineEnd);
outputStream.writeBytes("Content-Disposition: form-data; name=\"" + key + "\"" + lineEnd);
outputStream.writeBytes("Content-Type: text/plain" + lineEnd);
outputStream.writeBytes(lineEnd);
outputStream.writeBytes(value);
outputStream.writeBytes(lineEnd);
}
outputStream.writeBytes(twoHyphens + boundary + twoHyphens + lineEnd);
if (200 != connection.getResponseCode()) {
throw new Exception("Failed to upload code:" + connection.getResponseCode() + " " + connection.getResponseMessage());
}
inputStream = connection.getInputStream();
result = this.convertStreamToString(inputStream);
fileInputStream.close();
inputStream.close();
outputStream.flush();
outputStream.close();
JSONObject jsonObject = new JSONObject(result);
if(jsonObject.getString("success").equals("true")){
Toast.makeText(MainActivity.this, "Service Added", Toast.LENGTH_LONG).show();
}else{
}
tvLoad.setText("Successfully loaded");
Log.e("abc", " ========= result === " + result) ;
try {
JSONObject jsonObject1 = new JSONObject(result);
String link = jsonObject1.getString("link");
tvLink.setText(link);
}catch (Exception e){
e.printStackTrace();
}
} catch (Exception e) {
e.printStackTrace();
}
}
private String convertStreamToString(InputStream is) {
BufferedReader reader = new BufferedReader(new InputStreamReader(is));
StringBuilder sb = new StringBuilder();
String line = null;
try {
while ((line = reader.readLine()) != null) {
sb.append(line);
}
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return sb.toString();
}