我试图将一些数据发送到服务器。服务器正在等待json和图像。我尝试了我发现的每个例子，但我无法发送数据。实际上我发送了带有PrintWriter对象的json params，但它并不接受图像。 我需要使用HttpURLConnection而不是apache库。这是我的一段代码：
HttpURLConnection connection = null;
PrintWriter output = null;
ByteArrayOutputStream stream = new ByteArrayOutputStream();
attachImage.compress(Bitmap.CompressFormat.PNG, 40, stream);
byte[] imageData = stream.toByteArray();
String imagebase64 = Base64.encodeToString(imageData, Base64.DEFAULT);
Log.d(tag, "POST to " + url);
try{
URL url = new URL(this.url);
connection = (HttpURLConnection) url.openConnection();
connection.setRequestMethod("POST");
connection.setDoInput(true);
connection.setDoOutput(true);
connection.setUseCaches(false);
connection.setRequestProperty(HTTP_CONTENT_TYPE, "application/json; charset=utf-8");
connection.setRequestProperty(HTTP_USER_AGENT, mUserAgent);
connection.setRequestProperty(HTTP_HEADER_ACCEPT, "application/json; charset=utf-8");
connection.connect();
output = new PrintWriter(connection.getOutputStream());
JSONObject jsonParam = new JSONObject();
jsonParam.put("oauth_token", params.get("oauth_token"));
jsonParam.put("rating", "1");
jsonParam.put("comments", "ASDASDASDASDASDASDAS");
Log.d(tag, jsonParam.toString());
output.print(jsonParam);
output.flush();
output.close();
Log.d(tag, connection.getResponseCode() + connection.getResponseMessage());
}catch(Exception e ){
}
当我尝试在json params中发送图像时，收到500内部错误消息。
谢谢！
答案 0 :(得分：2)
好的，根据我的建议2种方式将图像发送到服务器
1.for base 64转到以下链接
Android post Base64 String to PHP
2.直接上传到服务器请查看以下链接
快乐的编码!!
答案 1 :(得分：1)
人们！经过很多天，我可以将图像上传到服务器！我正在阅读这个图书馆，它有很多用途。 https://source.android.com/reference/com/android/tradefed/util/net/HttpMultipartPost.html 我下载了源代码，并采取了一些条款来发送图像。我只发送由ASCII编码的字节。谢谢您的帮助！
答案 2 :(得分：0)
请检查以下代码，以发送包含图像或其他任何媒体文件的表单数据和zip文件。
private class MultipartFormTask extends AsyncTask<String, Void, String> {
String getStringFromInputStream(HttpURLConnection conn) {
String strResponse = "";
try {
DataInputStream inStream = new DataInputStream(
conn.getInputStream());
BufferedReader br = new BufferedReader(new InputStreamReader(
inStream));
String line;
while ((line = br.readLine()) != null) {
strResponse += line;
}
br.close();
inStream.close();
} catch (IOException ioex) {
Log.e("Debug", "error: " + ioex.getMessage(), ioex);
}
return strResponse;
}
void uploadJSONFeed(HttpURLConnection conn, DataOutputStream dos,
String lineEnd) {
String issue_details_key = "issue_details";
String issue_details_value = "Place your Jsondata HERE";
try {
dos.writeBytes("Content-Disposition: form-data; name=\""
+ issue_details_key + "\"" + lineEnd
+ "Content-Type: application/json" + lineEnd);
dos.writeBytes(lineEnd);
dos.writeBytes(issue_details_value);
dos.writeBytes(lineEnd);
} catch (IOException ioe) {
Log.e("Debug", "error: " + ioe.getMessage(), ioe);
}
}
void uploadZipFile(HttpURLConnection conn, DataOutputStream dos,
String lineEnd) {
int bytesRead, bytesAvailable, bufferSize;
byte[] buffer;
int maxBufferSize = 1 * 1024 * 1024;
try {
InputStream is = null;
try {
is = getAssets().open("Test.zip");
} catch (IOException ioe) {
// TODO Auto-generated catch block
Log.e("Debug", "error: " + ioe.getMessage(), ioe);
}
String zip_file_name_key = "file_zip";
String upload_file_name = "test.zip";
dos.writeBytes("Content-Disposition: form-data; name=\""
+ zip_file_name_key + "\";filename=\""
+ upload_file_name + "\"" + lineEnd); // uploaded_file_name
// is the Name
// of the File
// to be
// uploaded
dos.writeBytes(lineEnd);
bytesAvailable = is.available();
bufferSize = Math.min(bytesAvailable, maxBufferSize);
buffer = new byte[bufferSize];
bytesRead = is.read(buffer, 0, bufferSize);
while (bytesRead > 0) {
dos.write(buffer, 0, bufferSize);
bytesAvailable = is.available();
bufferSize = Math.min(bytesAvailable, maxBufferSize);
bytesRead = is.read(buffer, 0, bufferSize);
}
dos.writeBytes(lineEnd);
is.close();
} catch (IOException ioe) {
Log.e("Debug", "error: " + ioe.getMessage(), ioe);
}
}
@Override
protected String doInBackground(String... params) {
// TODO Auto-generated method stub
HttpURLConnection conn = null;
DataOutputStream dos = null;
String lineEnd = "\r\n";
String twoHyphens = "--";
String boundary = "*****";
String urlString = "http://www.example.org/api/file.php";
try {
// ------------------ CLIENT REQUEST
// FileInputStream fileInputStream = new FileInputStream(new
// File(existingFileName) );
// open a URL connection to the Servlet
URL url = new URL(urlString);
// Open a HTTP connection to the URL
conn = (HttpURLConnection) url.openConnection();
// Allow Inputs
conn.setDoInput(true);
// Allow Outputs
conn.setDoOutput(true);
// Don't use a cached copy.
conn.setUseCaches(false);
// Use a post method.
conn.setRequestMethod("POST");
conn.setRequestProperty("Connection", "Keep-Alive");
conn.setRequestProperty("Content-Type",
"multipart/form-data;boundary=" + boundary);
dos = new DataOutputStream(conn.getOutputStream());
dos.writeBytes(twoHyphens + boundary + lineEnd);
uploadJSONFeed(conn, dos, lineEnd);
dos.writeBytes(twoHyphens + boundary + lineEnd);
uploadZipFile(conn, dos, lineEnd);
dos.writeBytes(twoHyphens + boundary + twoHyphens + lineEnd);
dos.flush();
dos.close();
} catch (MalformedURLException ex) {
Log.e("Debug", "error: " + ex.getMessage(), ex);
} catch (IOException ioe) {
Log.e("Debug", "error: " + ioe.getMessage(), ioe);
}
// ------------------ read the SERVER RESPONSE
String strResponse = getStringFromInputStream(conn);
return strResponse;
}
@Override
protected void onPostExecute(String result) {
// might want to change "executed" for the returned string passed
// into onPostExecute() but that is upto you
Toast.makeText(getApplicationContext(), result, Toast.LENGTH_LONG)
.show();
Log.e("Result:", result);
}
}
答案 3 :(得分：0)
you can upload large jsonstring using buffer please use bellow code .
HttpsURLConnection connection = null;
OutputStream os = null;
InputStream is = null;
InputStreamReader isr = null;
try {
connection = (HttpsURLConnection) url.openConnection();
SSLContext contextSSL = SSLContext.getInstance("TLS");
contextSSL.init(null, new TrustManager[]{new DefaultTrustManager()}, new SecureRandom());
HttpsURLConnection.setDefaultSSLSocketFactory(contextSSL.getSocketFactory());
MySSLFactory(context.getSocketFactory()));
HttpsURLConnection.setDefaultHostnameVerifier(new MyHostnameVerifier());
connection.setDoInput(true);
connection.setDoOutput(true);
connection.setUseCaches(false);
connection.setChunkedStreamingMode(0);
connection.setRequestMethod("POST");
connection.setRequestProperty("Content-Type", "application/json");
connection.setRequestProperty("Accept", "application/json");
connection.setRequestProperty("Authorization", auth);
connection.setConnectTimeout(timeoutMillis);
OutputStream os ;
if (input != null && !input.isEmpty()) {
os = connection.getOutputStream();
InputStream stream = new ByteArrayInputStream(input.getBytes(StandardCharsets.UTF_8));
BufferedInputStream bis = new BufferedInputStream(stream, 8 * 1024);
byte[] buffer = new byte[8192];
int availableByte = 0;
while ((availableByte = bis.read(buffer)) != -1) {
os.write(buffer, 0, availableByte);
os.flush();
}
}
int responseCode = connection.getResponseCode();
答案 4 :(得分：-1)
HTTP 500错误代码表示发生了服务器端错误。
这与您的代码无关。
服务器有错误，而不是您的代码。