Android HttpClient上传文件 的一个封装方法。里面有一小段代码是处理获取JSON格式数据
System.out.println("executing request " + httppost.getRequestLine()); 返回协议和返回码
正确的话是 http 1.1 200
System.out.println(EntityUtils.toString(resEntity,"utf-8"));
获取处理后的页面内容

android并不自带MultipartEntity
把httpmime-4.1.1.jar 这个放进lib中就可以使用 MultipartEntity了
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public String post(String pathToOurFile,String urlServer) 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);
  
   //File path= Environment.getExternalStorageDirectory(); //取得SD卡的路径

//String pathToOurFile = path.getPath()+File.separator+"ak.txt"; //uploadfile
//String urlServer = "http://192.168.1.88/test/upload.php";

   HttpPost httppost = new HttpPost(urlServer);
   File file = new File(pathToOurFile);

   MultipartEntity mpEntity = new MultipartEntity(); //文件传输
   ContentBody cbFile = new FileBody(file);
   mpEntity.addPart("userfile", cbFile); // <input type="file" name="userfile" />  对应的

   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) {
     //System.out.println(EntityUtils.toString(resEntity,"utf-8"));
     json=EntityUtils.toString(resEntity,"utf-8");
     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;
 }