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; }