java实现获取网站的keywords，description

package cn.evan.util;
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 SemanticCrawl {
    public static void main(String[] args) {
        Document doc = null;
        try {
            doc = Jsoup.connect("网址").get();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        String title = doc.title();
        Elements metas = doc.head().select("meta");  
        for (Element meta : metas) {  
            String content = meta.attr("content");  
            if ("keywords".equalsIgnoreCase(meta.attr("name"))) {  
                System.out.println("关键字："+content);  
            }  
            if ("description".equalsIgnoreCase(meta.attr("name"))) {  
                System.out.println("网站内容描述:"+content);  
            }  
        }  
        Elements keywords = doc.getElementsByTag("meta");
        System.out.println("标题"+title);
    }
}