package org.liufeng.course.message.resp;

/**
 * 文本消息
 * 
 * @author liufeng
 * @date 2013-05-19
 */
public class TextMessage extends BaseMessage {
	// 回复的消息内容
	private String Content;

	public String getContent() {
		return Content;
	}

	public void setContent(String content) {
		Content = content;
	}
}

package org.liufeng.course.message.resp;

/**
 * 消息基类（公众帐号 -> 普通用户）
 * 
 * @author liufeng
 * @date 2013-05-19
 */
public class BaseMessage {
	// 接收方帐号（收到的OpenID）
	private String ToUserName;
	// 开发者微信号
	private String FromUserName;
	// 消息创建时间 （整型）
	private long CreateTime;
	// 消息类型（text/music/news）
	private String MsgType;
	// 位0x0001被标志时，星标刚收到的消息
	private int FuncFlag;

	public String getToUserName() {
		return ToUserName;
	}

	public void setToUserName(String toUserName) {
		ToUserName = toUserName;
	}

	public String getFromUserName() {
		return FromUserName;
	}

	public void setFromUserName(String fromUserName) {
		FromUserName = fromUserName;
	}

	public long getCreateTime() {
		return CreateTime;
	}

	public void setCreateTime(long createTime) {
		CreateTime = createTime;
	}

	public String getMsgType() {
		return MsgType;
	}

	public void setMsgType(String msgType) {
		MsgType = msgType;
	}

	public int getFuncFlag() {
		return FuncFlag;
	}

	public void setFuncFlag(int funcFlag) {
		FuncFlag = funcFlag;
	}
}

工具类

package org.liufeng.course.util;

import java.io.InputStream;
import java.io.Writer;
import java.util.Date;
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 org.liufeng.course.message.resp.Article;
import org.liufeng.course.message.resp.MusicMessage;
import org.liufeng.course.message.resp.NewsMessage;
import org.liufeng.course.message.resp.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;

/**
 * 消息工具类
 */
public class MessageUtil {

	/**
	 * 返回消息类型：文本
	 */
	public static final String RESP_MESSAGE_TYPE_TEXT = "text";

	/**
	 * 文本消息对象转换成xml
	 * alias 起别名,如果没有,根节点将面为com.pacage.textMessage的形式
	 * @param textMessage 文本消息对象
	 * @return xml
	 */
	public static String textMessageToXml(TextMessage textMessage) {
		xstream.alias("xml", textMessage.getClass());
		return xstream.toXML(textMessage);
	}

	public static void main(String[] args) {
		TextMessage textMessage = new TextMessage();
		textMessage.setToUserName("fromUser");
		textMessage.setFromUserName("toUser");
		textMessage.setCreateTime(new Date().getTime());
		textMessage.setMsgType(MessageUtil.RESP_MESSAGE_TYPE_TEXT);
		textMessage.setFuncFlag(0);
		String xml = new MessageUtil().textMessageToXml(textMessage);
		System.out.println(xml);
	}
	
	/**
	 * 扩展xstream，使其支持CDATA块
	 */
	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;
				String createTime = "";
				@SuppressWarnings("unchecked")
				public void startNode(String name, Class clazz) {
					if(name!=null&&name.equals("CreateTime")){
						createTime = "CreateTime";
					}else{
						createTime=name;
					}
					super.startNode(name, clazz);
				}
				protected void writeText(QuickWriter writer, String text) {
					if (cdata&&!createTime.equals("CreateTime")) {
						writer.write("<![CDATA[");
						writer.write(text);
						writer.write("]]>");
					} else {
						writer.write(text);
					}
				}
			};
		}
	});
}