@Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        findViewById(R.id.btn).setOnClickListener(new OnClickListener() {

            @Override

            public void onClick(View v) {

                new AsyncTask<String, Void, String>() {

                    @Override

                    protected String doInBackground(String... params) {

                        try {

                            URL url=new URL(params[0]);

                            HttpURLConnection connection=(HttpURLConnection)url.openConnection();

                            connection.setDoOutput(true);

                            connection.setRequestMethod("POST");

                            OutputStreamWriter osw=new OutputStreamWriter(connection.getOutputStream(),"UTF-8");

                            BufferedWriter bw=new BufferedWriter(osw);

                            bw.write("keyfrom=aiHttpGet&key=1989341286&type=data&doctype=json&version=1.1&q=post");

                            bw.flush();

                            InputStream iStream=connection.getInputStream();

                            InputStreamReader isr=new InputStreamReader(iStream,"UTF-8");

                            BufferedReader br=new BufferedReader(isr);

                            String line;

                            while ((line=br.readLine())!=null) {

                                Log.i("get", line);

                            }

                            br.close();

                            isr.close();

                            iStream.close();

                        } catch (MalformedURLException e) {

                            // TODO Auto-generated catch block

                            e.printStackTrace();

                        } catch (IOException e) {

                            // TODO Auto-generated catch block

                            e.printStackTrace();

                        }

                        return null;

                    }

                }.execute("http://fanyi.youdao.com/openapi.do");

            }

        });

    }