HttpURLConnection

原生网络请求

public class MainActivity extends AppCompatActivity {
    //接口地址
    private  String path = "http://www.yulin520.com/a2a/forum/allTypeList?sign=376C5BFC22179A1B8FF3A86D4588B29F&pageSize=10&ts=1877785007&forumType=0&page=1";

    private Handler handler = new Handler(){
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            switch (msg.what){
                case 0:
               String json = (String) msg.obj;
                    Log.i("xxx",json);
                    Gson gson = new Gson();


                break;
            }
        }
    };
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //找控件
         initView();

        getServerData();


    }

    private void getServerData() {
//请求网络是耗时操作 也可以异步
        //开子线程做耗时操作  android.os.NetworkOnMainThreadException
        new Thread(new Runnable() {
            @Override
            public void run() {
                //把接口地址包装成网络地址 联网需要加权限 android.permission.INTERNET
                try {
                    URL url = new URL(path);
                    //建立连接对象
                    HttpURLConnection connection = (HttpURLConnection) url.openConnection();
                    //设置超时时间
                    connection.setConnectTimeout(5000);
                    //设置请求方式 换请求方式 get和post
                    connection.setRequestMethod("POST");
                    //判断响应码
                    if(connection.getResponseCode()==200){
                        //获取输入流
                        InputStream inputStream = connection.getInputStream();


             //在子线程中直接更新UI 这种方式不建议使用
                       /* runOnUiThread(new Runnable() {
                            @Override
                            public void run() {
                                Toast.makeText(MainActivity.this, "请求成功", Toast.LENGTH_SHORT).show();


                            }
                        });
          */


                        //定义一个字节数组输出流
                        /*ByteArrayOutputStream bos = new ByteArrayOutputStream();
                        //定义一个字节数组
                        byte [] buffer = new byte[1024];
                        //定义长度
                        int len = 0;
                        while ((len=inputStream.read(buffer))!=-1){
                            bos.write(buffer,0,len);


                        }
                         inputStream.close();
                          bos.close();
                        final String json = bos.toString();*/


                        //抽取成工具类
                        String json = GetServerDataUtils.getServerData(inputStream);
                        /*runOnUiThread(new Runnable() {
                            @Override
                            public void run() {
                                Toast.makeText(MainActivity.this, "json:"+json, Toast.LENGTH_SHORT).show();
                                Log.i("xxx",json);
                            }
                        });*/
                       //创建消息 第一种
                        Message message = new Message();
                        //给消息加标识
                        message.what = 0;
                        //把数据给消息
                        message.obj = json;
                        //通过handler发送消息
                        handler.sendMessage(message);

                    }

                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }).start();

    }


    //找控件
    private void initView() {
        TextView tv_title = (TextView) findViewById(R.id.tv_title);


    }
}

别忘记加网络权限