Hello Everyone,
I am looking for an example on how to upload files in Java only. What I saw recently it requires JSP also. But I only wish to use Java only. Here is an example on what I used, but it seems does not work.
Can you please provide some samples or review the code below.
Thanks in advance.
public static void FileUpload(String URLPath, String FilePath){
HttpURLConnection conn = null;
DataOutputStream dos = null;
DataInputStream inStream = null;
String lineEnd = "\r\n";
String twoHyphens = "--";
String boundary = "*****";
int bytesRead, bytesAvailable, bufferSize;
byte[] buffer;
int maxBufferSize = 1*1024*1024;
try{
//------------------ CLIENT REQUEST
FileInputStream fileInputStream = new FileInputStream(new File(FilePath));
// open a URL connection to the Servlet
URL url = new URL(URLPath);
// 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);
dos.writeBytes("Content-Disposition: form-data; name=\"upload\";" + " filename=\"" + FilePath +"\"" + lineEnd);
dos.writeBytes(lineEnd);
// create a buffer of maximum size
bytesAvailable = fileInputStream.available();
bufferSize = Math.min(bytesAvailable, maxBufferSize);
buffer = new byte[bufferSize];
// read file and write it into form...
bytesRead = fileInputStream.read(buffer, 0, bufferSize);
while (bytesRead > 0){
dos.write(buffer, 0, bufferSize);
bytesAvailable = fileInputStream.available();
bufferSize = Math.min(bytesAvailable, maxBufferSize);
bytesRead = fileInputStream.read(buffer, 0, bufferSize);
SimpleLog.write(FilePath + " uploaded to " + URLPath);
}
// send multipart form data necesssary after file data...
dos.writeBytes(lineEnd);
dos.writeBytes(twoHyphens + boundary + twoHyphens + lineEnd);
// close streams
fileInputStream.close();
dos.flush();
dos.close();
//System.out.println(FilePath + " uploaded to from " + URLPath);
}catch (MalformedURLException ex){
System.out.println("From ServletCom CLIENT REQUEST:"+ex);
}catch (IOException ioe){
System.out.println("From ServletCom CLIENT REQUEST:"+ioe);
}
//------------------ read the SERVER RESPONSE
try {
inStream = new DataInputStream ( conn.getInputStream() );
String str;
while (( str = inStream.readLine()) != null){
//System.out.println("Server response is: " + str);
//System.out.println("");
}
inStream.close();
}catch (IOException ioex){
System.out.println("From (ServerResponse): " + ioex);
}
}
public static void main(String args[]){
String URLPath = "http://server:8080/ATTACHMENTS";
String FilePath = "C:\\file.xls";
UploadDataFile.FileUpload(URLPath, FilePath);
}
