Jsoup解析HTML问题

Question

我是 Jsoup 的新手，我正在尝试使用以下 html 解析网站，并检索下面 html 中输入的文本的值，特别是“value=14”，然后我想显示该值（在这种情况下，数字 14）作为我的 android 应用程序中文本视图中的字符串。我尝试了多种方法，但没有奏效，我只收到“null”。请举例说明。

<div id="PatientsCurrentlyInClinic" style="display: none"> <!-- Messages are shown when a link with these attributes are clicked: href="#messages" rel="modal"  -->

            <h3>Which clinic are you updating?</h3>
            <form action="" method="get">
            <p>
                <select name="patientclinicid" id="patientclinicid"><option value="2" selected>Location Two</option><option value="1">Location One</option><option value="3">Location Three</option></select>               </p>



                <h4>How many patients are in the clinic?</h4>
                <p>
                    To provide better service to your patients, please enter the current number of patients in your clinic.
                </p>
                    <input class="text-input medium-input" type="text" id="small-input" name="patientsInClinic" value="14"/>

                    <p><input class="button" name="patients-clinic" type="submit" value="Update" /></p>


            </form>

        </div> <!-- End #messages -->

我给我“null”的尝试如下：

private class Title extends AsyncTask<Void, Void, Void> {
    String name;
    String value;


    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        mProgressDialog = new ProgressDialog(HTML.this);
        mProgressDialog.setTitle("Checking Database");
        mProgressDialog.setMessage("Loading...");
        mProgressDialog.setIndeterminate(false);
        mProgressDialog.show();
    }

    @Override
    protected Void doInBackground(Void... params) {
        try {

            Document doc = Jsoup.connect(url).get();
            Elements inputElems =doc.select("input#small-input");
            for (Element inputElem : inputElems){
                name = inputElem.attr("name");
                value = inputElem.attr("value");
            }
        } catch(Throwable t) {
            t.printStackTrace();
        }
        return null;
    }

    @Override
    protected void onPostExecute(Void result) {
        // Set title into TextView
        TextView txttitle = (TextView) findViewById(R.id.showPatientNumber);
        txttitle.setText(value);
        mProgressDialog.dismiss();
    }
}

Answer 1

试试这个，

Elements inputElems =doc.select("input");
Iterator<Element> linksIt = inputElems .iterator();

while (linksIt.hasNext()) {
    Element inputElem = linksIt.next();
    String id = inputElem.attr("id");

    if(id.equals("small-input")){
        name = inputElem.attr("name");
        value= inputElem.attr("value");
    }
}

Answer 2

我终于能够通过使用以下代码获得该值：

Element pInput = doc.select("input[id=small-input]").first();
           rPts = pInput.attr("value");

这最初是空的，但是在我添加了以下代码以获取身份验证 cookie 之后，我将其传递到存储我的数据值的下一个网页以及我试图从中获取解析数据的位置，它是成功。

  Document doc1 = res.parse();
            String sessionId = res.cookie("SESSIONID");



            Document doc = Jsoup.connect(url)
                    .cookie("SESSIONID", sessionId)
                    .get();

Answer 3

试试这个：

 Elements inputElems =doc.select("input");
 for (Element inputElem : inputElems){
    name = inputElem.attr("name").first();
    value = inputElem.attr("value").first();
 }