尝试实现一个简单的示例来解析html
失败：

Exception in thread "main" java.lang.NoClassDefFoundError: org/jsoup/Jsoup
    at html_parser.JSoupBsp.main(JSoupBsp.java:16)
Caused by: java.lang.ClassNotFoundException: org.jsoup.Jsoup
    at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:606)
    at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:168)
    at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522)
    ... 1 more

代码：

package html_parser;

import java.io.IOException; 
import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;

public class JSoupBsp {

    public static void main(String[] args) {   
            // Dokument von URL laden
            Document doc = null;
            try {
                doc = Jsoup.connect("http://www.javabeginners.de").get();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            System.out.println(doc.title());            

    }
}

项目道具：在此处输入图像描述
所以我不知道为什么它不起作用。