code extract to use HttpPost with StringEntity with JSON in it.
String jsonRequest = "the file data and related stuff";
StringEntity stringEntityForProgressBar = new StringEntity(jsonRequest, progressBean);
httpPost.setEntity(stringEntityForProgressBar);
HttpResponse response = httpClient.execute(httpPost);
My own StringEntity.java
import java.io.IOException;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import com.edentiti.registrations.verification.ProgressBean;
public class StringEntity extends org.apache.http.entity.StringEntity
{
private ProgressBean _progressBean;
public StringEntity(String string, ProgressBean progressBean) throws UnsupportedEncodingException
{
super(string);
_progressBean = progressBean;
}
private OutputStreamProgress outstream;
@Override
public void writeTo(OutputStream outstream) throws IOException
{
this.outstream = new OutputStreamProgress(outstream, _progressBean, getContentLength());
super.writeTo(this.outstream);
}
}
My own StringEntity.java, for my own purpose, the progress goes up to 70% here and you can adjust it(e.g. up to 100%) to suit your own purpose.
import java.io.IOException;
import java.io.OutputStream;
import com.edentiti.registrations.verification.ProgressBean;
public class OutputStreamProgress extends OutputStream {
private final static int CHUNK_SIZE = 40960; // Ming feels it is a lucky number, no solid reason for it.
private ProgressBean _progressBean;
private long _contentLength;
private final OutputStream outstream;
private volatile long bytesWritten=0;
public OutputStreamProgress(OutputStream outstream, ProgressBean progressBean, long contentLength)
{
this._progressBean = progressBean;
this._contentLength = contentLength;
this.outstream = outstream;
}
@Override
public void write(int b) throws IOException {
outstream.write(b);
bytesWritten++;
}
@Override
public void write(byte[] b) throws IOException {
int numChunks;
if (b.length % CHUNK_SIZE == 0)
{
numChunks = b.length / CHUNK_SIZE;
}
else
{
numChunks = (b.length / CHUNK_SIZE) + 1;
}
for (int i = 0; i <= numChunks; i++)
{
// if last block
if (i == numChunks)
{
write(b, i * CHUNK_SIZE, b.length);
}
else
{
write(b, i * CHUNK_SIZE, CHUNK_SIZE);
}
}
}
@Override
public void write(byte[] b, int off, int len) throws IOException {
outstream.write(b, off, len);
bytesWritten += len;
long progressValue = (long) ((70 * getWrittenLength()) / _contentLength);
if (progressValue > 70)
{
progressValue = 70;
}
if (progressValue < 1)
{
progressValue = 1;
}
// here we only allow something between 1 to 70
_progressBean.setValue(Long.valueOf(progressValue));
}
@Override
public void flush() throws IOException {
outstream.flush();
}
@Override
public void close() throws IOException {
outstream.close();
}
public long getWrittenLength() {
return bytesWritten;
}
}
References:
- http://stackoverflow.com/questions/7057342/how-to-get-a-progress-bar-for-a-file-upload-with-apache-httpclient-4
