Question

我正在尝试使用我的计算机的本地IP地址将我的Android设备连接到我的sql数据库，但没有任何反应。我有错误。

在为BufferedReader检索附加的javadoc时超时[在BufferedReader.class [在java.io中[在E：\ Installer \ Application \ Eclipse \ sdk \ android-sdk-windows \ platforms \ android-23 \ a droid] .jar]]]

来自我的LogCat

java.lang.RuntimeException：执行doInBackground（）时发生错误

引起：java.lang.ClassCastException：libcore.net.http.HttpURLConnectionImpl无法强制转换为javax.net.ssl.HttpsURLConnection

class BackgroundTask extends AsyncTask< Void, Void, String>{

    String json_url = "http://192.168.1.106/sample/sample.php";
    HttpURLConnection httpsURLConnection = null;

    @Override
    protected String doInBackground(Void... params) {
        try {
            URL url = new URL(json_url);
            httpsURLConnection = (HttpsURLConnection) url.openConnection(); 
            InputStream inputStream = httpsURLConnection.getInputStream();
            BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
            StringBuilder stringBuilder = new StringBuilder();

            while((JSON_STRING = bufferedReader.readLine()) != null){
                stringBuilder.append(JSON_STRING+"\n");
            }

            bufferedReader.close();
            inputStream.close();
            httpsURLConnection.disconnect();

            return stringBuilder.toString().trim();
        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;

    @Override
    protected void onPostExecute(String result) {
        TextView textView = (TextView) findViewById(R.id.tvDisplay);
        textView.setText(result);
    }
}

任何建议都将不胜感激。

Answer 1

在这一行 -

httpsURLConnection = (HttpsURLConnection) url.openConnection();

你应该成功 -

httpsURLConnection = (HttpURLConnection) url.openConnection();

在Http之后还有一个额外的s。你把它扔到错误的班级。

Answer 2

如果您正在使用＆＃39; http＆＃39;使用HttpURLConnection代替HttpsURLConnection。与您的本地服务器通信。虽然＆＃39; HttpsURLConnection＆＃39;继承自＆＃39; HttpURLConnection＆＃39;，当你错误地投射它时它不会给你错误但是当你实际通过http连接时它可能会给你错误。

httpurlconnection本地ip地址

2 个答案: