android okhttp怎么给服务器传递的参数怎么转成json

public String androidPost() { String rs = null; String path = "url/Android_JDBC_SH/AndroidLoginAction"; HttpPost hp = new HttpPost(path); //获取客户端，用来向服务器发出请求 DefaultHttpClient hc = new DefaultHttpClient(); try { //Default Constructor taking a name and a value BasicNameValuePair nm = new BasicNameValuePair("name", name); BasicNameValuePair pa = new BasicNameValuePair("password", password); List list = new ArrayList(); list.add(nm); list.add(pa); //构建向服务器发送的实体 HttpEntity entity = new UrlEncodedFormEntity(list); hp.setEntity(entity); //提交请求，获取服务器的响应 HttpResponse response = hc.execute(hp); if (response.getStatusLine().getStatusCode() == 200) { //获取响应实体 entity = response.getEntity(); rs = EntityUtils.toString(entity); } } catch (ClientProtocolException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } return rs; }