Java tutorial
/* Copyright 2012 Sbastien Vrillaud Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. */ /* This code is taken from Rafael Sanches' blog. http://blog.rafaelsanches.com/2011/01/29/upload-using-multipart-post-using-httpclient-in-android/ */ package org.kochka.android.weightlogger.tools; import java.io.ByteArrayInputStream; import java.io.ByteArrayOutputStream; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.util.Random; import org.apache.http.Header; import org.apache.http.HttpEntity; import org.apache.http.message.BasicHeader; import android.util.Log; public class SimpleMultipartEntity implements HttpEntity { private final static char[] MULTIPART_CHARS = "-_1234567890abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ" .toCharArray(); private String boundary = null; ByteArrayOutputStream out = new ByteArrayOutputStream(); boolean isSetLast = false; boolean isSetFirst = false; public SimpleMultipartEntity() { final StringBuffer buf = new StringBuffer(); final Random rand = new Random(); for (int i = 0; i < 30; i++) { buf.append(MULTIPART_CHARS[rand.nextInt(MULTIPART_CHARS.length)]); } this.boundary = buf.toString(); } public void writeFirstBoundaryIfNeeds() { if (!isSetFirst) { try { out.write(("--" + boundary + "\r\n").getBytes()); } catch (final IOException e) { Log.e("WeightLogger :: ", e.getMessage(), e); } } isSetFirst = true; } public void writeLastBoundaryIfNeeds() { if (isSetLast) { return; } try { out.write(("\r\n--" + boundary + "--\r\n").getBytes()); } catch (final IOException e) { Log.e("WeightLogger :: ", e.getMessage(), e); } isSetLast = true; } public void addPart(final String key, final String value) { writeFirstBoundaryIfNeeds(); try { out.write(("Content-Disposition: form-data; name=\"" + key + "\"\r\n").getBytes()); out.write("Content-Type: text/plain; charset=UTF-8\r\n".getBytes()); out.write("Content-Transfer-Encoding: 8bit\r\n\r\n".getBytes()); out.write(value.getBytes()); out.write(("\r\n--" + boundary + "\r\n").getBytes()); } catch (final IOException e) { Log.e("WeightLogger :: ", e.getMessage(), e); } } public void addPart(final String key, final String fileName, final InputStream fin) { addPart(key, fileName, fin, "application/octet-stream"); } public void addPart(final String key, final String fileName, final InputStream fin, String type) { writeFirstBoundaryIfNeeds(); try { type = "Content-Type: " + type + "\r\n"; out.write(("Content-Disposition: form-data; name=\"" + key + "\"; filename=\"" + fileName + "\"\r\n") .getBytes()); out.write(type.getBytes()); out.write("Content-Transfer-Encoding: binary\r\n\r\n".getBytes()); final byte[] tmp = new byte[4096]; int l = 0; while ((l = fin.read(tmp)) != -1) { out.write(tmp, 0, l); } out.flush(); } catch (final IOException e) { Log.e("WeightLogger :: ", e.getMessage(), e); } finally { try { fin.close(); } catch (final IOException e) { Log.e("WeightLogger :: ", e.getMessage(), e); } } } public void addPart(final String key, final File value) { try { addPart(key, value.getName(), new FileInputStream(value)); } catch (final FileNotFoundException e) { Log.e("WeightLogger :: ", e.getMessage(), e); } } @Override public long getContentLength() { writeLastBoundaryIfNeeds(); return out.toByteArray().length; } @Override public Header getContentType() { return new BasicHeader("Content-Type", "multipart/form-data; boundary=" + boundary); } @Override public boolean isChunked() { return false; } @Override public boolean isRepeatable() { return false; } @Override public boolean isStreaming() { return false; } @Override public void writeTo(final OutputStream outstream) throws IOException { outstream.write(out.toByteArray()); } @Override public Header getContentEncoding() { return null; } @Override public void consumeContent() throws IOException, UnsupportedOperationException { if (isStreaming()) { throw new UnsupportedOperationException("Streaming entity does not implement #consumeContent()"); } } @Override public InputStream getContent() throws IOException, UnsupportedOperationException { return new ByteArrayInputStream(out.toByteArray()); } }