xml TO json（非递归实现）

之前的xml文件转化为json是利用json-lib或者递归方式实现的，在效率方面难免有些不足.经过改进，利用栈实现了非递归的方式，首先需要导入dom4j的jar包。

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import com.alibaba.fastjson.JSONObject;import org.dom4j.Document;import org.dom4j.DocumentException;import org.dom4j.Element;import org.dom4j.io.SAXReader;import java.io.File;import java.util.List;import java.util.Stack;/** * Created by 东方电视台 on 2017/7/28. */public class xmlTojson {    public static void main(String[] args) throws Exception{        JSONObject result = getJson("test.xml");        System.out.println(result.toString());    }    public static Document readXml(String filename) throws DocumentException {        Document document = null;        try{            //获取xml文件            File file = new File(filename);            //创建SAXReader对象            SAXReader reader = new SAXReader();            //读取文件            document = reader.read(file);        }catch (DocumentException e){            e.printStackTrace();        }        return  document;    }    public static JSONObject getJson(String filename) throws Exception {        JSONObject jsonObj = new JSONObject();        try {            Document doc = readXml(filename);            Element root = doc.getRootElement();            Stack<Element> stackElement = new Stack<Element>();            Stack<JSONObject> stackJson = new Stack<JSONObject>();            stackElement.push(root);            stackJson.push(jsonObj);            while (!stackElement.isEmpty()) {                Element element = stackElement.pop();                JSONObject json = stackJson.pop();                List<Element> childList = element.elements();                //判断该节点的子节点下是否为叶子节点                for (Element e : childList) {                    //如果子节点为叶子节点                    if (e.elements().isEmpty()) {                        json.put(e.getName(), e.getText());                    } else {                        JSONObject jsonNew = new JSONObject();                        json.put(e.getName(), jsonNew);                        stackElement.push(e);                        stackJson.push(jsonNew);                    }                }            }        } catch (Exception e) {            e.printStackTrace();        }        return jsonObj;    }}