XMLUtils.java

package com.xxxx.xxxx.xxx.utils;

import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;

import java.io.File;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.TreeMap;

/**
 * Created by leon on 10/02/2017.
 * jsoup 2 xml utils
 */
public class XMLUtils {

    private static final boolean isDebug = true;

    public static Document string2Doc(String s) {
        try {
            Document doc = Jsoup.parse(s, "utf8");
            if (isDebug) {
                pwd(doc);
            }
            return doc;
        } catch (Exception e) {
            if (isDebug) {
                System.out.println("file2Elements failed, e = " + e);
            }
            return null;
        }
    }


    public static Document file2Doc(File file) {
        try {
            Document doc = Jsoup.parse(file, "utf8");
            if (isDebug) {
                pwd(doc);
            }
            return doc;
        } catch (Exception e) {
            if (isDebug) {
                System.out.println("file2Elements failed, e = " + e);
            }
            return null;
        }
    }

    /**
     * tag: get `<dependency attr="233"></dependency>` => `dependencies dependency`
     * <p>
     * html()(Str) / getAllElements(AST):          <groupId>junit</groupId>
     * <artifactId>junit</artifactId>
     * <version>4.11</version>
     * <type>jar</type>
     * <scope>test</scope>
     * attr(): "233"
     * <p>
     * Elements links = doc.select("a[href]"); // a with href
     * Elements pngs = doc.select("img[src$=.png]");
     * // img with src ending .png
     * <p>
     * Element masthead = doc.select("div.masthead").first();
     * // div with class=masthead
     * <p>
     * see <a href>https://jsoup.org/cookbook/extracting-data/selector-syntax</a>
     *
     * @param element
     * @param css
     * @return
     */

    public static Elements select(Element element, String css) {
        return element.select(css);
    }

    public static String firstText(Element element, String css) {
        return element.select(css).first().text();
    }


    public static void pwd(Element element) {
        if (isDebug) {
            System.out.println(element.tag() + " is at = " + element.cssSelector());
        }
    }

    /**
     * Last level xml 2 map
     *
     * @param element
     * @return
     */
    public static Map<String, String> element2map(Element element) {
        Map<String, String> map = new TreeMap<String, String>();
        Elements childs = element.children();
        for (int i = 0; i < childs.size(); i++) {
            Element e = childs.get(i);
            String key = e.tagName();
            String val = e.text();
            map.put(key, val);
        }
        return map;
    }

    public static List<Element> asList(Elements elements) {
        List<Element> list = new ArrayList<Element>();
        for (int i = 0; i < elements.size(); i++) {
            Element e = elements.get(i);
            list.add(e);
        }
        return list;
    }

    public static void main(String[] args) throws Exception {
        File file = new File("pom.xml");
        Document doc = file2Doc(file);
        Elements plugins = doc.select("project build plugins plugin");
        for (Element plugin : plugins) {
            System.out.println("element = " + element2map(plugin));

        }

    }
}