public class MainActivity extends AppCompatActivity { private ListView lv; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); //找控件 lv = (ListView) findViewById(R.id.lv); new Thread(){ @Override public void run() { getMenuInfoForPost("红烧肉","e3c3dd5597dd875ff29c665a25b74025"); } }.start(); } /** * HttpURLConnection请求数据 * 请求方式 : post */ private void getMenuInfoForPost(String menu,String key){ try { URL url = new URL("http://apis.juhe.cn/cook/query.php"); HttpURLConnection connection = (HttpURLConnection) url.openConnection(); //请求方式必须大写 connection.setRequestMethod("POST"); connection.setConnectTimeout(5000); connection.setReadTimeout(5000); //设置请求参数 OutputStream os = connection.getOutputStream(); os.write(("menu="+ URLEncoder.encode(menu,"utf-8")+"key="+key).getBytes()); os.flush(); //等待服务器响应 int code = connection.getResponseCode(); if(code == 200){ InputStream is = connection.getInputStream(); String menuInfo = StreamTools.readFromNetWork(is); Gson gson = new Gson(); MenuInfo info = gson.fromJson(menuInfo, MenuInfo.class); System.out.println("结果-->"+info); } } catch (Exception e) { e.printStackTrace(); } } }