package com.itmayiedu.utils;

import java.io.InputStream;
import java.io.Writer;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;

import org.dom4j.Document;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;

import com.itmayiedu.base.TextMessage;
import com.thoughtworks.xstream.XStream;
import com.thoughtworks.xstream.core.util.QuickWriter;
import com.thoughtworks.xstream.io.HierarchicalStreamWriter;
import com.thoughtworks.xstream.io.xml.PrettyPrintWriter;
import com.thoughtworks.xstream.io.xml.XppDriver;

import lombok.extern.slf4j.Slf4j;

@Slf4j
public class XmlUtils {
    /**
     * 解析微信发来的请求（XML）
     * 
     * @param request
     * @return Map<String, String>
     * @throws Exception
     */
    @SuppressWarnings("unchecked")
    public static Map<String, String> parseXml(HttpServletRequest request) throws Exception {
        // 将解析结果存储在HashMap中
        Map<String, String> map = new HashMap<String, String>();

        // 从request中取得输入流
        InputStream inputStream = request.getInputStream();
        // 读取输入流
        SAXReader reader = new SAXReader();
        Document document = reader.read(inputStream);
        // 得到xml根元素
        Element root = document.getRootElement();
        // 得到根元素的所有子节点
        List<Element> elementList = root.elements();

        // 遍历所有子节点
        for (Element e : elementList)
            map.put(e.getName(), e.getText());

        // 释放资源
        inputStream.close();
        inputStream = null;

        return map;
    }

    /**
     * 文本消息对象转换成xml
     * 
     * @param textMessage
     *            文本消息对象
     * @return xml
     */
    public static String messageToXml(TextMessage textMessage) {
        xstream.alias("xml", textMessage.getClass());··
        return xstream.toXML(textMessage);
    }

    /**
     * 扩展xstream使其支持CDATA
     */
    private static XStream xstream = new XStream();
}