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);
    }
}