package?com.cheney.chat;

import?java.io.File;
import?java.io.FileOutputStream;
import?java.io.IOException;
import?java.io.PrintWriter;
import?java.text.DateFormat;
import?java.text.SimpleDateFormat;
import?java.util.Date;
import?java.util.Iterator;
import?java.util.Random;
import?java.util.Vector;

import?javax.servlet.ServletException;
import?javax.servlet.http.HttpServlet;
import?javax.servlet.http.HttpServletRequest;
import?javax.servlet.http.HttpServletResponse;
import?javax.servlet.http.HttpSession;

import?org.jdom.Document;
import?org.jdom.Element;
import?org.jdom.JDOMException;
import?org.jdom.input.SAXBuilder;
import?org.jdom.output.Format;
import?org.jdom.output.xmlOutputter;


public?class?MessagesAction?extends?HttpServlet?{

	/**
	?*?Constructor?of?the?object.
	?*/
	public?MessagesAction（）?{
		super（）;
	}

	/**
	?*?Destruction?of?the?servlet.?

	?*/
	public?void?destroy（）?{
		super.destroy（）;?//?Just?puts?“destroy“?string?in?log
		//?Put?your?code?here
	}

	/**
	?*?The?doGet?method?of?the?servlet.?

	?*
	?*?This?method?is?called?when?a?form?has?its?tag?value?method?equals?to?get.
	?*?
	?*?@param?request?the?request?send?by?the?client?to?the?server
	?*?@param?response?the?response?send?by?the?server?to?the?client
	?*?@throws?ServletException?if?an?error?occurred
	?*?@throws?IOException?if?an?error?occurred
	?*/
	public?void?doGet（HttpServletRequest?request?HttpServletResponse?response）
			throws?ServletException?IOException?{

		doPost（request?response）;
	}

	/**
	?*?The?doPost?method?of?the?servlet.?

	?*
	?*?This?method?is?called?when?a?form?has?its?tag?value?method?equals?to?post.
	?*?
	?*?@param?request?the?request?send?by?the?client?to?the?server
	?*?@param?response?the?response?send?by?the?server?to?the?client
	?*?@throws?ServletException?if?an?error?occurred
	?*?@throws?IOException?if?an?error?occurred
	?*/
	public?void?doPost（HttpServletRequest?request?HttpServletResponse?response）
			throws?ServletException?IOException?{
		String?action?=?request.getParameter（“action“）;
		if?（“getMessages“.equals（action））?{		//從xml文件中讀取聊天信息
			this.getMessages（request?response）;
		}?else?if?（“sendMessage“.equals（action））?{	//發送聊天信息
			this.sendMessages（request?response）;
		}?else?if?（“loginRoom“.equals（action））?{	//登錄時，寫入系統公告
			this.loginRoom（request?response）;
		}
	}
	//?讀取保存聊天信息的xml文件
	public?void?getMessages（HttpServletRequest?requestHttpServletResponse?response）?{
		response.setContentType（“text/html;charset=GBK“）;
		String?fileURL?=?createFile（request?response）;?//?當文件不存在時創建該文件
		
		/*******************開始解析保存聊天內容的xml文件**********************/
		Document?feedDoc?=null;
		try?{
			SAXBuilder?builder?=?new?SAXBuilder（）;
			feedDoc?=?builder.build（fileURL）;?//得到xml的文件
			Element?root?=?feedDoc.getRootElement（）;			//獲取根節點
			Element?channel?=?root.getChild（“messages“）;		//獲取messages節點?還有一種xpath讀法
			Iterator?items?=?channel.getChil

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2013-01-06?19:28??chat2013\
?????文件?????????951??2013-01-06?15:17??chat2013\.classpath
?????目錄???????????0??2013-01-06?19:28??chat2013\.myeclipse\
?????文件?????????297??2013-01-06?15:09??chat2013\.mymetadata
?????文件????????1414??2013-01-06?16:01??chat2013\.project
?????目錄???????????0??2013-01-06?19:28??chat2013\.settings\
?????文件?????????500??2013-01-06?15:09??chat2013\.settings\.jsdtscope
?????文件?????????330??2013-01-06?15:09??chat2013\.settings\org.eclipse.jdt.core.prefs
?????文件??????????49??2013-01-06?15:09??chat2013\.settings\org.eclipse.wst.jsdt.ui.superType.container
?????文件???????????6??2013-01-06?15:09??chat2013\.settings\org.eclipse.wst.jsdt.ui.superType.name
?????目錄???????????0??2013-01-06?19:28??chat2013\WebRoot\
?????目錄???????????0??2013-01-06?19:28??chat2013\WebRoot\CSS\
?????目錄???????????0??2013-01-06?19:28??chat2013\WebRoot\CSS\.svn\
?????文件?????????178??2013-01-06?15:16??chat2013\WebRoot\CSS\.svn\all-wcprops
?????文件?????????327??2013-01-06?15:16??chat2013\WebRoot\CSS\.svn\entries
?????目錄???????????0??2013-01-06?19:28??chat2013\WebRoot\CSS\.svn\prop-base\
?????目錄???????????0??2013-01-06?19:28??chat2013\WebRoot\CSS\.svn\props\
?????目錄???????????0??2013-01-06?19:28??chat2013\WebRoot\CSS\.svn\text-base\
?????文件????????2176??2013-01-06?15:16??chat2013\WebRoot\CSS\.svn\text-base\style.css.svn-base
?????目錄???????????0??2013-01-06?19:28??chat2013\WebRoot\CSS\.svn\tmp\
?????目錄???????????0??2013-01-06?19:28??chat2013\WebRoot\CSS\.svn\tmp\prop-base\
?????目錄???????????0??2013-01-06?19:28??chat2013\WebRoot\CSS\.svn\tmp\props\
?????目錄???????????0??2013-01-06?19:28??chat2013\WebRoot\CSS\.svn\tmp\text-base\
?????文件????????2176??2012-10-11?09:14??chat2013\WebRoot\CSS\style.css
?????目錄???????????0??2013-01-06?19:28??chat2013\WebRoot\JS\
?????目錄???????????0??2013-01-06?19:28??chat2013\WebRoot\JS\.svn\
?????文件?????????186??2013-01-06?15:17??chat2013\WebRoot\JS\.svn\all-wcprops
?????文件?????????331??2013-01-06?15:17??chat2013\WebRoot\JS\.svn\entries
?????目錄???????????0??2013-01-06?19:28??chat2013\WebRoot\JS\.svn\prop-base\
?????目錄???????????0??2013-01-06?19:28??chat2013\WebRoot\JS\.svn\props\
?????目錄???????????0??2013-01-06?19:28??chat2013\WebRoot\JS\.svn\text-base\
............此處省略102個文件信息