java中怎么调用api数据接口

public  static  String do_post(String url, List name_value_pair)  throws  IOException {
        String body =  "{}" ;
        DefaultHttpClient httpclient =  new  DefaultHttpClient();
        try  {
            HttpPost httpost =  new  HttpPost(url);
            httpost.setEntity( new  UrlEncodedFormEntity(name_value_pair, StandardCharsets.UTF_8));
            HttpResponse response = httpclient.execute(httpost);
            HttpEntity entity = response.getEntity();
            body = EntityUtils.toString(entity);
        }  finally  {
            httpclient.getConnectionManager().shutdown();
        }
        return  body;
    }
    public  static  String do_get(String url)  throws  ClientProtocolException, IOException {
        String body =  "{}" ;
        DefaultHttpClient httpclient =  new  DefaultHttpClient();
        try  {
            HttpGet httpget =  new  HttpGet(url);
            HttpResponse response = httpclient.execute(httpget);
            HttpEntity entity = response.getEntity();
            body = EntityUtils.toString(entity);
        }  finally  {
            httpclient.getConnectionManager().shutdown();
        }
        return  body;
    }