Android HttpClient post MultipartEntity

在Android 中使用HttpClient，MultipartEntity

为了发送图片，文件等资源，现在采用开源的org.apache.http.entity.mime.MultipartEntity

一.去官网http://hc.apache.org/downloads.cgi 下载

可以只下载binary，如果可能需要修改源文件的话，可以直接下载source.

二.导入jar包

将下载下来的httpcomponents-client-4.2.5-bin.zip取其httpcomponents-client-4.2.5-bin.zip\httpcomponents-client-4.2.5\lib\httpmime-4.2.5.jar包

将httpmime-4.2.5.jar包，放到android工程的lib目录下。

三. 查看jar包，

我这里用的是源文件，因为我需要修改些东西

三.使用

class MyAsyncTask extends AsyncTask<String, Integer, String> {String FORM_TABLE_NAME = "ask?action=Chatbottom-toSay-";// 自己需要配置的表单String filePath = "/mnt/sdcard/picture.jpg";// 测试写的文件路径，转换成自己的文件路径final String hostUrl = "http://www.myhost.com";// 写成自己要上传的地址@Overrideprotected String doInBackground(String... params) {HttpClient httpclient = null;httpclient = new DefaultHttpClient();final HttpPost httppost = new HttpPost(hostUrl);final File imageFile = new File(filePath);final MultipartEntity multipartEntity = new MultipartEntity();if (false) {InputStream in = null;try {in = new FileInputStream(imageFile);} catch (FileNotFoundException e) {e.printStackTrace();}InputStreamBody inputStreamBody = new InputStreamBody(in,"android_inputstream.jpg");// FormBodyPart formBodyPart = new FormBodyPart(FORM_TABLE_NAME,// contentBody);multipartEntity.addPart(FORM_TABLE_NAME, inputStreamBody);}if (false) {ContentBody contentBody = new FileBody(imageFile);FormBodyPart formBodyPart = new FormBodyPart(FORM_TABLE_NAME,contentBody);multipartEntity.addPart(formBodyPart);}if (false) {// FileBody fileBody = new FileBody(imageFile, "image/jpeg",// "utf-8");FileBody fileBody = new FileBody(imageFile);multipartEntity.addPart(FORM_TABLE_NAME, fileBody);}if (true) {Bitmap photoBM = BitmapFactory.decodeFile(filePath);if (photoBM == null) {return null;}ByteArrayOutputStream photoBao = new ByteArrayOutputStream();boolean successCompress = photoBM.compress(CompressFormat.JPEG,80, photoBao);if (!successCompress) {return null;}ByteArrayBody byteArrayBody = new ByteArrayBody(photoBao.toByteArray(), "android.jpg");photoBM.recycle();// InputStreamBody inbody = new InputStreamBody(new InputStream,// filename);multipartEntity.addPart(FORM_TABLE_NAME, byteArrayBody);}httppost.setEntity(multipartEntity);HttpResponse httpResponse;try {httpResponse = httpclient.execute(httppost);final int statusCode = httpResponse.getStatusLine().getStatusCode();String response = EntityUtils.toString(httpResponse.getEntity(), HTTP.UTF_8);IWLog.d("got response:\n" + response);if (statusCode == HttpStatus.SC_OK) {return "success";}} catch (ClientProtocolException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();} finally {if (httpclient != null) {httpclient.getConnectionManager().shutdown();httpclient = null;}}return null;}@Overrideprotected void onPostExecute(String result) {super.onPostExecute(result);if (result.equals("success")) {}}}

四.与HttpURLConnection比较

网上好多人都用的是HttpURLConnection来上传图片，文件。由于我在解决实际问题时HttpURLConnection并不能达到预期，老是死在urlConnection.getInputStream()永远回不来。所以不得以改用的上面的库。最终感觉MultipartEntity用起来比较简单。

附：

在解决实际问题中，我也不是一帆风顺，也遇到了各种抽象的问题。推荐给大家个工具wireshark工具，用于抓取网络协议用的。很有帮助