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package com.example.upload;import java.io.FilterOutputStream;import java.io.IOException;import java.io.OutputStream;import java.nio.charset.Charset;import org.apache.http.entity.mime.HttpMultipartMode;import org.apache.http.entity.mime.MultipartEntity;public class CustomMultiPartEntity extends MultipartEntity {	private final ProgressListener listener;	public CustomMultiPartEntity(final ProgressListener listener) {		super();		this.listener = listener;	}	public CustomMultiPartEntity(final HttpMultipartMode mode, final ProgressListener listener) {		super(mode);		this.listener = listener;	}	public CustomMultiPartEntity(HttpMultipartMode mode, final String boundary, final Charset charset, final ProgressListener listener) {		super(mode, boundary, charset);		this.listener = listener;	}	@Override	public void writeTo(final OutputStream outstream) throws IOException {		super.writeTo(new CountingOutputStream(outstream, this.listener));	}	public static interface ProgressListener {		void transferred(long num);	}	public static class CountingOutputStream extends FilterOutputStream {		private final ProgressListener listener;		private long transferred;		public CountingOutputStream(final OutputStream out, final ProgressListener listener) {			super(out);			this.listener = listener;			this.transferred = 0;		}		public void write(byte[] b, int off, int len) throws IOException {			out.write(b, off, len);			this.transferred += len;			this.listener.transferred(this.transferred);		}		public void write(int b) throws IOException {			out.write(b);			this.transferred++;			this.listener.transferred(this.transferred);		}	}}

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