微信开发之对象转换为xml

package util;

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 message.resp.Article;

import message.resp.ImageMessage;

import message.resp.MusicMessage;

import message.resp.NewsMessage;

import message.resp.TextMessage;

import message.resp.VideoMessage;

import message.resp.VoiceMessage;

import org.dom4j.Document;

import org.dom4j.Element;

import org.dom4j.io.SAXReader;

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;

/**

* 消息处理工具类

*

*/

public class MessageUtil {

// 请求消息类型：文本

public static final String REQ_MESSAGE_TYPE_TEXT = "text";

// 请求消息类型：图片

public static final String REQ_MESSAGE_TYPE_IMAGE = "image";

// 请求消息类型：语音

public static final String REQ_MESSAGE_TYPE_VOICE = "voice";

// 请求消息类型：视频

public static final String REQ_MESSAGE_TYPE_VIDEO = "video";

// 请求消息类型：地理位置

public static final String REQ_MESSAGE_TYPE_LOCATION = "location";

// 请求消息类型：链接

public static final String REQ_MESSAGE_TYPE_LINK = "link";

// 请求消息类型：事件推送

public static final String REQ_MESSAGE_TYPE_EVENT = "event";

// 事件类型：subscribe(订阅)

public static final String EVENT_TYPE_SUBSCRIBE = "subscribe";

// 事件类型：unsubscribe(取消订阅)

public static final String EVENT_TYPE_UNSUBSCRIBE = "unsubscribe";

// 事件类型：scan(用户已关注时的扫描带参数二维码)

public static final String EVENT_TYPE_SCAN = "scan";

// 事件类型：LOCATION(上报地理位置)

public static final String EVENT_TYPE_LOCATION = "LOCATION";

// 事件类型：CLICK(自定义菜单)

public static final String EVENT_TYPE_CLICK = "CLICK";

// 响应消息类型：文本

public static final String RESP_MESSAGE_TYPE_TEXT = "text";

// 响应消息类型：图片

public static final String RESP_MESSAGE_TYPE_IMAGE = "image";

// 响应消息类型：语音

public static final String RESP_MESSAGE_TYPE_VOICE = "voice";

// 响应消息类型：视频

public static final String RESP_MESSAGE_TYPE_VIDEO = "video";

// 响应消息类型：音乐

public static final String RESP_MESSAGE_TYPE_MUSIC = "music";

// 响应消息类型：图文

public static final String RESP_MESSAGE_TYPE_NEWS = "news";

/**

* 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;

}

/**

* 扩展xstream使其支持CDATA

*/

private static XStream xstream = new XStream(new XppDriver() {

public HierarchicalStreamWriter createWriter(Writer out) {

return new PrettyPrintWriter(out) {

// 对所有xml节点的转换都增加CDATA标记

boolean cdata = true;

@SuppressWarnings("unchecked")

public void startNode(String name, Class clazz) {

super.startNode(name, clazz);

if(name.equals("CreateTime")){

cdata = false;

}else {

cdata = true;

}

}

protected void writeText(QuickWriter writer, String text) {

if (cdata) {

writer.write("<![CDATA[");

writer.write(text);

writer.write("]]>");

} else {

writer.write(text);

}

}

};

}

});

/**

* 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);

}

/**

* 图片消息对象转换成xml

*

* @param imageMessage 图片消息对象

* @return xml

*/

public static String messageToXml(ImageMessage imageMessage) {

xstream.alias("xml", imageMessage.getClass());

return xstream.toXML(imageMessage);

}

/**

* 语音消息对象转换成xml

*

* @param voiceMessage 语音消息对象

* @return xml

*/

public static String messageToXml(VoiceMessage voiceMessage) {

xstream.alias("xml", voiceMessage.getClass());

return xstream.toXML(voiceMessage);

}

/**

* 视频消息对象转换成xml

*

* @param videoMessage 视频消息对象

* @return xml

*/

public static String messageToXml(VideoMessage videoMessage) {

xstream.alias("xml", videoMessage.getClass());

return xstream.toXML(videoMessage);

}

/**

* 音乐消息对象转换成xml

*

* @param musicMessage 音乐消息对象

* @return xml

*/

public static String messageToXml(MusicMessage musicMessage) {

xstream.alias("xml", musicMessage.getClass());

return xstream.toXML(musicMessage);

}

/**

* 图文消息对象转换成xml

*

* @param newsMessage 图文消息对象

* @return xml

*/

public static String messageToXml(NewsMessage newsMessage) {

xstream.alias("xml", newsMessage.getClass());

xstream.alias("item", new Article().getClass());

return xstream.toXML(newsMessage);

}

}