java:从url获取一个参数

import java.net.URL;
import java.net.URLDecoder;

public class Main {
    public static void main(String[] args) {
        try {
            String urlString = "http://example.com/?param1=value1&param2=value2";
            URL url = new URL(urlString);
            String query = url.getQuery();
            String[] params = query.split("&");
            
            for (String param : params) {
                String[] keyValue = param.split("=");
                String paramName = URLDecoder.decode(keyValue[0], "UTF-8");
                String paramValue = URLDecoder.decode(keyValue[1], "UTF-8");
                
                if (paramName.equals("param1")) {
                    System.out.println("param1的值为：" + paramValue);
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}