如何从以下 URL 获取一些数据？

Question

我想从以下 URL 获取一些数据，如 sunriseTime、outTemp、outsideHumidity 等。如果您知道我该怎么做，请帮助我。

网址 enter link description here

Answer 1

您需要执行以下操作：

• 打开网址
• 阅读网页内容
• 创建要在数据中找到的模式
• 使用 Regex（正则表达式）从数据中匹配您想要的模式

我已经编写了一个 Java 程序来执行上述操作。希望对你有帮助:)

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.URL;
import java.net.URLConnection;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;


class URLReader {

    public static List<String> getAttributesFromURL(String urlString, 
                                                    String [] keys) {
        StringBuilder sb = new StringBuilder();
        try {

            //Opening the URL
            URL url = new URL(urlString);
            URLConnection urlConnection = url.openConnection();
            BufferedReader bufferedReader = new BufferedReader(
                    new InputStreamReader(urlConnection.getInputStream()));

            // Reading the URL contents into a StringBuilder object
            String line;
            while ((line = bufferedReader.readLine()) != null) {
                sb.append(line + "\n");
            }
            bufferedReader.close();
        } catch (Exception e) {
            e.printStackTrace();
        }

        // Copying the StringBuilder contents into a string
        String contents = sb.toString();


        List<String> keyList = Arrays.asList(keys);
        List<String> result = new ArrayList<String>();
        for (String key : keyList) {

            // Defining the pattern to be found in contents
            String patternToFind = key + "=\"(.*)\"";
            Pattern p = Pattern.compile(patternToFind);
            Matcher m = p.matcher(contents);
            if (m.find()) {

                // If pattern found, store them in the result list
                result.add(key + ": " + m.group(1).trim());
            }
        }
        // Returning the result
        return result;
    }
    public static void main(String[] args) throws java.lang.Exception {
        String urlString ="http://www.metar.gr/ws/alexan/ZWNTANA.htm";

        // List all the keys whose values need to be extracted
        String[] keys = {"sunriseTime", "outsideTemp", "outsideHumidity"};

        // Getting the result
        List<String> attributeValuePairs = getAttributesFromURL(urlString, keys);
        System.out.println(attributeValuePairs);
    }
}

上述程序的输出将是：

[sunriseTime: 6:14, outsideTemp: 21.7, outsideHumidity: 57]

你可以通过在程序中keysarray中指定属性名来获取你想要的其他属性的值。