Android Studio中与网站通信

post方法

HttpURLConnection必须在子线程执行

/**
                     * 方法名: new Thread
                     * 作用: 开启新的子线程,
                     * start(): 是准备运行子线程
                     * run(): 运行子线程
                     */
                    new Thread(new Runnable() {
                        @Override
                        public void run() {
                            String path = "https://网址";  //要提交的网址,如果是http需要android:usesCleartextTraffic="true"
                            try {
                                URL url = new URL(path);
                                HttpURLConnection conn = (HttpURLConnection) url.openConnection();  //得到conn对象
                                conn.setConnectTimeout(60000);  //连接服务器超时
                                conn.setRequestMethod("POST");  //设置请求模式
                                conn.setReadTimeout(60000);  //从服务器接收数据超时
                                conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");// 设置发送的数据为表单类型，会被添加到http body当中
                                //conn.setRequestProperty ("Content-Type", "application/json");
                                Gson gson = new Gson();
                                Person person = new Person();
                                person.setCha_xun("ceshi");
                                person.setKai_shi_shi_jian(shu_zi);
                                String data = gson.toJson(person); //将对象转换为JSON
                                conn.setRequestProperty("Content-Length", String.valueOf(data.length()));//设置发送数据的长度
                                conn.setDoOutput(true); //设置true表示连接为输出(提交),默认为false.
                                conn.setUseCaches(false); //设置不用缓存
                                conn.setDoInput(true);  //设置true表示连接为输入(提交),默认为true.
                                conn.getOutputStream().write(data.getBytes()); //写入此连接的输出流,我理解为提交数据
                                int responseCode = conn.getResponseCode(); //从HTTP响应消息获取状态代码
                                if (responseCode == 200) {
                                    InputStream inputStream = conn.getInputStream(); //从这个打开的连接读取数据的输入流(读取服务器返回的数据)
                                    final String result = StreamUtils.readStream(inputStream); //解析数据
                                    runOnUiThread(new Runnable() { //在子线程操作UI更新的方法
                                        @Override
                                        public void run() {
                                            textView_cha_xun_fan_hui.setText(result);
                                        }
                                    });
                                } else {
                                    showToastInAnyThread("保存失败");
                                }


                            } catch (MalformedURLException e) {
                                e.printStackTrace();
                            } catch (IOException e) {
                                e.printStackTrace();
                            }
                        }
                    }).start();

StreamUtils类

public class StreamUtils {
    public static String readStream(InputStream is){
        try {
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            byte[] buffer = new byte[1024];
            int len = 0;
            while(( len = is.read(buffer))!=-1){
                baos.write(buffer, 0, len);
            }
            is.close();
            String result = baos.toString();

            if(result.contains("gb2312")){
                return baos.toString("gb2312");
            }else{
                return result;
            }

        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

    public static Bitmap readBitmap(InputStream is){
        return BitmapFactory.decodeStream(is);
    }
}