java使用http往服务器上传文件（图片）
使用http往服务端上传文件，要使用MultipartEntity，需要引入httpmime包，在附件中。

public static String postFile(String uploadFile, final String uploadType, String userId) throws ClientProtocolException, IOException, JSONException {   HttpClient httpclient = new DefaultHttpClient();   //设置通信协议版本   httpclient.getParams().setParameter(CoreProtocolPNames.PROTOCOL_VERSION, HttpVersion.HTTP_1_1);   Log.i("chopin", uploadFile);    HttpPost httppost = new HttpPost(Const.ImageUpload);       File file = new File(uploadFile);    MultipartEntity mpEntity = new MultipartEntity(); //文件传输    ContentBody cbFile = new FileBody(file);    mpEntity.addPart("file", cbFile);     mpEntity.addPart("userId",new StringBody(userId));    mpEntity.addPart("uploadType",new StringBody(uploadType));         httppost.setEntity(mpEntity);   System.out.println("executing request " + httppost.getRequestLine());      HttpResponse response = httpclient.execute(httppost);   HttpEntity resEntity = response.getEntity();   System.out.println(response.getStatusLine());//通信Ok   String json="";   String path="";   if (resEntity != null) {     json=EntityUtils.toString(resEntity,"utf-8");     Log.i("chopin", json);     JSONObject p=null;     try{     p=new JSONObject(json);     path=(String) p.get("path");     }catch(Exception e){     e.printStackTrace();     }   }   if (resEntity != null) {     resEntity.consumeContent();   }   httpclient.getConnectionManager().shutdown();   return path; }