java - 如何在网页中搜索字词

Question

如何在给定 url 说“www.microsoft.com”的网页中搜索是否存在该词。我是否需要下载此网页才能执行此搜索？

Answer 1

你只需要在网页上发出http请求并抓取它的所有内容，然后你就可以在其中搜索必要的词，下面的代码可能会帮助你这样做。

 public static void main(String[] args) {
    try {
        URL url;
        URLConnection urlConnection;
        DataOutputStream outStream;
        DataInputStream inStream;

        // Build request body
        String body =
        "fName=" + URLEncoder.encode("Atli", "UTF-8") +
        "&lName=" + URLEncoder.encode("Þór", "UTF-8");

        // Create connection
        url = new URL("http://www.example.com");
        urlConnection = url.openConnection();
        ((HttpURLConnection)urlConnection).setRequestMethod("POST");
        urlConnection.setDoInput(true);
        urlConnection.setDoOutput(true);
        urlConnection.setUseCaches(false);
        urlConnection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
        urlConnection.setRequestProperty("Content-Length", ""+ body.length());

        // Create I/O streams
        outStream = new DataOutputStream(urlConnection.getOutputStream());
        inStream = new DataInputStream(urlConnection.getInputStream());

        // Send request
        outStream.writeBytes(body);
        outStream.flush();
        outStream.close();

        // Get Response
        // - For debugging purposes only!
        String buffer;
        while((buffer = inStream.readLine()) != null) {
            System.out.println(buffer);
        }

        // Close I/O streams
        inStream.close();
        outStream.close();
    }
    catch(Exception ex) {
        System.out.println("Exception cought:\n"+ ex.toString());
    }
}