[英]write byte[] object in file and send file to server
i'm trying to write an byte[] (encrypted text) in a file on android client, and then sending this file to the Server (using HTTP). 我试图在Android客户端上的文件中写入byte [](加密的文本),然后将此文件发送到服务器(使用HTTP)。 the file is correctly created in the mobile, but when it is stored at server side, it creates a file with 0 bytes.
该文件是在移动设备中正确创建的,但是当它存储在服务器端时,它将创建一个0字节的文件。
here is the android code to write the file 这是写入文件的android代码
File file = new File(getExternalCacheDir(), "index.txt");
FileOutputStream fout = new FileOutputStream(file);
ObjectOutputStream oos = new ObjectOutputStream(fout);
oos.writeObject(encIndex);
oos.close();
here is the servlet code to read and store the file 这是读取和存储文件的servlet代码
String fileName = request.getHeader("fileName");
File saveFile = new File(SAVE_DIR + fileName);
// opens input stream of the request for reading data
InputStream inputStream = request.getInputStream();
// opens an output stream for writing file
FileOutputStream outputStream = new FileOutputStream(saveFile);
byte[] buffer = new byte[BUFFER_SIZE];
int bytesRead;
System.out.println("Receiving data...");
while ((bytesRead = inputStream.read(buffer)) != -1) {
outputStream.write(buffer, 0, bytesRead);
}
System.out.println("Data received.");
outputStream.close();
inputStream.close();
System.out.println("File written to: " + saveFile.getAbsolutePath());
file.close();
Code for Client to Server file sending 客户端到服务器文件发送的代码
File uploadFile = new File(filePath, fileName);
URL url = new URL(UPLOAD_URL);
HttpURLConnection httpConn = (HttpURLConnection)url.openConnection();
httpConn.setUseCaches(false);
httpConn.setDoOutput(true);
httpConn.setRequestMethod("POST");
httpConn.setRequestProperty("fileName", uploadFile.getName());
OutputStream outputStream = httpConn.getOutputStream();
FileInputStream inputStream = new FileInputStream(uploadFile);
byte[] buffer = new byte[BUFFER_SIZE];
int bytesRead;
while ((bytesRead = inputStream.read(buffer)) != -1) {
outputStream.write(buffer, 0, bytesRead);
}
outputStream.close();
inputStream.close();
for some reasons, i can not use Socket. 由于某些原因,我无法使用Socket。 The android doesn't show any error.
android没有显示任何错误。 the error that server shows is that, the file is empty/ and i'm operating on the empty file
服务器显示的错误是,文件为空/,并且我正在处理空文件
fout.write(encIndex);
fout.close();
Or 要么
BufferedOutputStream oos = new BufferedOutputStream(fout,
Math.min(4086, encIndex.length));
oos.write(encIndex);
oos.close();
The problem was that, i was sending the some more data with URL, ie https://ip:8084/project/servelt?reqid=something&data=something , 问题是,我正在使用URL发送更多数据,即https:// ip:8084 / project / servelt?reqid = something&data = something ,
the code, somehow, don't allow me to read the parameters first, I needed to read the file first, and then the parameters from the URL... 代码以某种方式不允许我首先读取参数,我需要首先读取文件,然后再读取URL中的参数...
Jean and Joop, thank you for the suggestions. 让和乔普,谢谢你的建议。
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