检查smtp连接是否正常使用PHP Mailer并获取状态接收OK

Question

我想通过发送邮件或ping服务器来检查SMTP服务器是否正常工作并获得响应收据确认。

我想用php检查我的smtp是关闭还是关闭。我尝试使用下面的PHPmailer代码测试它。哪个是测试smtp是否使用php脚本运行的最佳方法。

    public class CurrentAffairs extends AppCompatActivity {
    public static int correct, wrong, marks;
    DbH db;
    ArrayList<Question> mcqs;
    Cursor cur;
    ListView lv;
    CustomAdapter c;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.current_affairs);

        //casting
        lv = (ListView) findViewById(R.id.lv);
        mcqs = new ArrayList<>();


    enter code here
        try {
            db = new DbH(this);
        } catch (IOException e2) {

            e2.printStackTrace();
        }

        try {
            db.createdatabase();
        } catch (IOException e) {

            e.printStackTrace();
        }

        db.opendatabase();
        cur = db.data();

        try {

            while (cur.moveToNext()) {
                String mcqss = cur.getString(1);
                String opta = cur.getString(2);
                String optb = cur.getString(3);
                String optc = cur.getString(4);
                String optd = cur.getString(5);
                String answ = cur.getString(6);

                //put data in a listview
                Question question = new Question();
                question.question = mcqss;
                question.option1 = opta;
                question.option2 = optb;
                question.option3 = optc;
                question.option4 = optd;
                question.correctanxer = answ;
                mcqs.add(question);



               c = new CustomAdapter(CurrentAffairs.this, R.layout.row, R.id.mcqsText, mcqs);
                lv.setAdapter(c);


            }
        } finally {
            cur.close();
        }
        Button btnshow = (Button) findViewById(R.id.btnshowresult);
        btnshow.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                StringBuffer sb = new StringBuffer();
                sb.append("Correct Answer = " + " " + correct);
                sb.append("    " + "Wrong Answer = " + " " + wrong);
                sb.append("    " + "Final Score = " + " " + correct * 5);

                Toast.makeText(CurrentAffairs.this, sb, Toast.LENGTH_SHORT).show();
            }
        });
    }



    class CustomAdapter extends ArrayAdapter<Question> {

        public CustomAdapter(Context context, int resource, int textViewResourceId, ArrayList<Question> objects) {
            super(context, resource, textViewResourceId, objects);


        }

        @Override
        public View getView(final int position, View convertView, ViewGroup parent) {

            LayoutInflater inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            View v = inflater.inflate(R.layout.row, parent, false);
            TextView mcqsText = (TextView) v.findViewById(R.id.mcqsText);
            TextView ans2 = (TextView) v.findViewById(R.id.answer2);
            TextView anss = (TextView) v.findViewById(R.id.answer);
            RadioGroup rg = (RadioGroup) v.findViewById(R.id.radioGroup);

            RadioButton opt1 = (RadioButton) v.findViewById(R.id.optA);
            RadioButton opt2 = (RadioButton) v.findViewById(R.id.optB);
            RadioButton opt3 = (RadioButton) v.findViewById(R.id.optC);
            RadioButton opt4 = (RadioButton) v.findViewById(R.id.optD);

            Question question = mcqs.get(position);

            mcqsText.setText(question.question);
            opt1.setText(question.option1);
            opt2.setText(question.option2);
            opt3.setText(question.option3);
            opt4.setText(question.option4);
            anss.setText(question.selectedanxer);
            ans2.setText("Correct answer is = " + question.correctanxer);

            String test=opt1.getText().toString();
            String test2=question.selectedanxer+"";

            if (test.equals(""+test2)){
                opt1.setChecked(true);
            }
            if (test2.equals(opt2.getText()+"")){
                opt2.setChecked(true);
            }
            if (test2.equals(opt3.getText()+"")){
                opt3.setChecked(true);
            }
            if (test2.equals(opt4.getText()+"")){
                opt4.setChecked(true);
            }




            rg.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
                @Override
                public void onCheckedChanged(RadioGroup group, int checkedId) {


                    Question question1=mcqs.get(position);
                    RadioButton radioButton= (RadioButton) group.findViewById(checkedId);
                    mcqs.get(position).selectedanxer=radioButton.getText().toString();
                    notifyDataSetChanged();



                }
            });

            return v;
        }
    }

    public class Question {
        String question;
        String option1;
        String option2;
        String option3;
        String option4;

        String selectedanxer;
        String correctanxer;

    }

}

我尝试了上面的代码，但仍然没用。