HttpURLConnection 使用 Post 方式传递 Json 数据网络请求实例小记

傷城~ 2024-04-06 09:25 48阅读 0赞

1、我新建了一个新项目，先添加权限：

<uses-permission android:name="android.permission.INTERNET"/>

2、添加属性（如果网址是 http 的话需要添加，https 不需要添加）：

android:usesCleartextTraffic="true"

3、新起一个子线程（网络请求可能比较耗时，不允许在主线程中执行）：

private void startHttpRequestThread() {
            new Thread(new Runnable() {
                @Override
                public void run() {
                    doHttpRequest();
                }
            }).start();
        }

4、定义需要传递给服务器的 json 数据

private String getJsonContent() throws JSONException {
            JSONObject jsonObject = new JSONObject();
            jsonObject.put("username", "user123");
            jsonObject.put("password", "psw123");
            jsonObject.put("device", "device123");
            return jsonObject.toString();
        }

5、执行网络请求：

private void doHttpRequest() {
            try {
                URL url = new URL("http://192.168.xxx.xxx:8080/xxx/login");
                HttpURLConnection conn = (HttpURLConnection) url.openConnection();
                conn.setRequestMethod("POST");
                conn.setRequestProperty("Connection","keep-Alive");
                conn.setRequestProperty("Content-Type", "application/json");
                conn.setDoOutput(true);
                conn.setDoInput(true);
                conn.setUseCaches(false);
                conn.connect();
                String json = getJsonContent();
                OutputStream os = conn.getOutputStream();
                os.write(json.getBytes(StandardCharsets.UTF_8));
                os.flush();
                os.close();
                int responseCode = conn.getResponseCode();
                android.util.Log.e("tag", "responseCode = " + responseCode);
                if (responseCode == HttpURLConnection.HTTP_OK) {
                    InputStream input = conn.getInputStream();
                    StringBuilder sb = new StringBuilder();
                    int ss;
                    while ((ss = input.read()) != -1) {
                        sb.append((char) ss);
                    }
                    android.util.Log.e("tag", "请求结果 = " + sb.toString());
                    input.close();
                }
                conn.disconnect();
            } catch (Exception e) {
                android.util.Log.e("tag", "出现异常: " + e.toString());
                e.printStackTrace();
            }
        }