himessagefuncs.java

运用hibernate技术 实现的留言板

/**
 * 
 */
package com.tiandinet.HiMessage;

import com.tiandinet.hibernate.HibernateUtil;

import org.hibernate.Criteria;
import org.hibernate.criterion.Expression;
import org.hibernate.Session;
import org.hibernate.Transaction;
import org.hibernate.HibernateException;
import org.hibernate.Query;

import java.util.List;
import java.util.Iterator;
import java.util.Hashtable;
import java.util.Set;

/**
 * @author Meng Yang
 *
 */
public class HiMessageFuncs {

	private Hashtable replyMsgs = new Hashtable();
	/**
	 * 
	 */
	public HiMessageFuncs() {
	}

	/**
	 * get Configuration
	 * @return Conf
	 */
	
	public Hashtable getReplyMsgs() {
		return this.replyMsgs;
	}
	
	public Conf getConfiguration() {
		Conf conf = null;
		try {
			Session session = HibernateUtil.getSession();
			
			String sql = "select conf from Conf as conf";
			Query query = session.createQuery(sql);
			query.setMaxResults(1);
			List result = query.list();
			
			if (result.size() == 1) {
				conf = (Conf)result.get(0);
			}
			else {
				// add conf
				Transaction tx = session.beginTransaction();
				conf = new Conf();
				conf.setPageshow(new Integer(20));
				conf.setShowIp(new Integer(1));
				conf.setTitle("HiMessage - TiandiNet.com");
				session.save(conf);
				tx.commit();
			}
			
			HibernateUtil.closeSession();
		}
		catch (Exception e) {
		}
		
		return conf;
	}
	
	/**
	 * get message total
	 * @return int
	 */
	public int getMessageTotal() {
		int total = 0;
		
		try {
			Session session = HibernateUtil.getSession();
			total = ((Integer)session.createQuery("select count(*) from Msg").iterate().next()).intValue();
			HibernateUtil.closeSession();
		}
		catch (Exception he) {
			total = 0;
		}
		
		return total;
	}
	
	/**
	 * get page total
	 */
	public int getPageTotal(int messageTotal, int pageshow) {
		int pageTotal = 0;
		if (messageTotal > 0) {
			float totalTmp = (float)messageTotal/(float)pageshow;
			float totalTmp2 = (float)(messageTotal/pageshow);
			if (totalTmp > totalTmp2) {
				pageTotal = (int)totalTmp2 + 1;
			}
			else {
				pageTotal = (int)totalTmp2;
			}
		}
		return pageTotal;
	}
	
	public Msg getMessage(String msgId, Session session) {
		Msg msg = null;
		try {
			//Session session = HibernateUtil.getSession();
			
			String sql = "select msg from Msg as msg where msg.MsgId=:msgid";
			
			Query query = session.createQuery(sql);
			query.setString("msgid", msgId);
			query.setMaxResults(1);
			
			Iterator result = query.iterate();
			while (result.hasNext()) {
				msg = (Msg)result.next();
			}
			
			//HibernateUtil.closeSession();
		}
		catch (Exception he) {
			msg = null;
		}
		
		return msg;
	}
	
	public Msg getMessageForServletInvoke(String msgId) {
		Msg msg = null;
		try {
			Session session = HibernateUtil.getSession();
			
			String sql = "select msg from Msg as msg where msg.MsgId=:msgid";
			
			Query query = session.createQuery(sql);
			query.setString("msgid", msgId);
			query.setMaxResults(1);
			
			Iterator result = query.iterate();
			while (result.hasNext()) {
				msg = (Msg)result.next();
			}
			
			HibernateUtil.closeSession();
		}
		catch (Exception he) {
		}
		
		return msg;
	}
	
	/**
	 * get messages
	 * @param page
	 * @return Hashtable
	 */
	public Hashtable getMessages(int page) {
		Conf conf = this.getConfiguration();
		Hashtable ht = new Hashtable();
		
		/*
		int total = this.getMessageTotal();
		if (total == 0) {
			return ht;
		}
		*/
		
		try {
			Session session = HibernateUtil.getSession();

			int pageShow = conf.getPageshow().intValue();
			
			//String sql = "select msg from Msg as msg order by msg.MsgId desc";
			String sql = "select msg from Msg as msg order by msg.PostTime desc";
			Query query = session.createQuery(sql);
			int firstResult = (page - 1) * pageShow;
			query.setFirstResult(firstResult);
			//query.setFetchSize(pageShow);
			query.setMaxResults(pageShow);
			
			//System.out.println(">>>>>>> firstResult: " + String.valueOf(firstResult));
			//System.out.println(">>>>>>> pageShow: " + String.valueOf(pageShow));

			Iterator result = query.iterate();
			int i = 0;
			while (result.hasNext()) {	
				Msg msg = (Msg)result.next();
				Set s = msg.getPics();
				ht.put(new Integer(i), msg);
				
				if (msg.getReId() != null 
						&& !msg.getReId().equals("") 
						&& !msg.getReId().equals("NONE")) {
					
					Msg replyMsg = this.getMessage(msg.getReId(), session);
					if (replyMsg == null) {
						replyMsg = new Msg();
						replyMsg.setMsgId("Deleted");
					}
					this.replyMsgs.put(new String(msg.getMsgId()), replyMsg);
				}
				
				i++;
			}
			
			HibernateUtil.closeSession();
		}
		catch (Exception he) {
		}
		
		return ht;
	}
	
	/**
	 * get messages
	 * @param page
	 * @return List
	 */
	public List getMessagesList(int page) {
		Conf conf = this.getConfiguration();
		List result = null;
		
		/*
		int total = this.getMessageTotal();
		if (total == 0) {
			return result;
		}
		*/
		
		try {
			Session session = HibernateUtil.getSession();

			int pageShow = conf.getPageshow().intValue();
			
			String sql = "select msg from Msg as msg order by msg.MsgId desc";
			Query query = session.createQuery(sql);
			int firstResult = (page - 1) * pageShow;
			query.setFirstResult(firstResult);
			query.setFetchSize(pageShow);
			result = query.list();
			
			HibernateUtil.closeSession();
		}
		catch (Exception he) {
		}
		
		return result;
	}
	
	/**
	 * add new message
	 * @param reId ip name qq email msn content filename
	 * @return boolean
	 */
	public boolean addMessage(String reId, 
									String ip, 
									String name, 
									String headima,
									String qq, 
									String email, 
									String msn, 
									String content, 
									String filename) {
		try {
			Session session = HibernateUtil.getSession();
			Transaction tx = session.beginTransaction();
			
			Msg msg = new Msg();
			msg.setReId(reId);
			msg.setIp(ip);
			msg.setName(name);
			msg.setHeadima(headima);
			msg.setQq(qq);
			msg.setEmail(email);
			msg.setMsn(msn);
			msg.setIcq("");
			msg.setSite("");
			msg.setIsEnable(new Integer(1));
			msg.setPostTime(new java.util.Date());
			msg.setContent(this.HtmlSpecialChars(content));
			
			// set the uploaded file
			if (filename != null 
					&& !filename.equals("NONE")) {
				Pic pic = new Pic();
				pic.setMsg(msg);
				pic.setFilename(filename);
	
				if (msg.getPics() == null) {
					msg.setPics(new java.util.HashSet());
				}
	
				msg.getPics().add(pic);
			}

			session.save(msg);
			tx.commit();
			
			HibernateUtil.closeSession();
			
			return true;
		}
		catch (Exception e) {
			//
			return false;
		}
	}
	
	/**
	 * 
	 */
	public String HtmlSpecialChars(String str)
	{
		if(str == null||str.equals(""))
		{
		    return str;
		}
		
		StringBuffer temp = new StringBuffer();
		int i = 0;
		while(i < str.length()) 
		{
			if(str.charAt(i) == '\n')
			{
			    temp = temp.append("<br>");
			}
				
			else if(str.charAt(i) == ' ')
			{
			    temp = temp.append("&nbsp;");
			}
				
			else if(str.charAt(i) == '<')
			{
			    temp = temp.append("&lt;");
			}
				
			else if(str.charAt(i) == '>')
			{
			    temp = temp.append("&gt;");
			}
			else
			{
			    temp = temp.append(str.substring(i,i+1));
			}
		
			i++;
		}
		
		String okstring = temp.toString();
		return okstring;
	}
	
	/**
	 * Generate the page link
	 * @param url queryString pageTotal page
	 * @return String
	 * 
	 * @author Meng Yang
	 */
	public String pageLink(String url, String queryString, int pageTotal, int page) {
		int num = 2;
		
		String link = "";
		
		if (page < 1) {
			page = 1;
		}
		else if (page > pageTotal) {
			page = pageTotal;
		}
		
		if (!queryString.equals("")) {
			String[] pattern = new String[4];
			String[] replace = new String[4];
			
			pattern[0] = "(^page=[0-9]*&)";
			pattern[1] = "(&page=[0-9]*&)";
			pattern[2] = "(&page=[0-9]*$)";
			pattern[3] = "(^page=[0-9]*$)";
	
			replace[0] = "";
			replace[1] = "&";
			replace[2] = "";
			replace[3] = "";
			
			for (int i = 0, k = pattern.length; i < k; i++) {
				queryString = queryString.replaceAll(pattern[i], replace[i]);
			}
		}
		
		if (!queryString.equals("")) {
			link = url + "?" + queryString;
		}
		else {
			link = url;
		}
		
		if (link.indexOf("?") == -1) {
			link += "?page=";
		}
		else {
			link += "&page=";
		}
		
		String linkString = "";

		if (page != 1) {
			linkString += "<a href=\"" + link + "1\">|&lt;&lt;</a>&nbsp;";
			linkString += "<a href=\"" + link + String.valueOf(page - 1) + "\">&lt;</a>&nbsp;";
		}

		int beginRange = page - 1;
		if (beginRange > num) {
			beginRange = num;
		}

		String last = "";
		if (beginRange > 0) {
			for (int i = page - beginRange; i < page; i++) {
				last += "<a href=\"" + link + String.valueOf(i) + "\">" + String.valueOf(i) + "</a>&nbsp;";
			}
		}

		int endRange = pageTotal - page;
		if (endRange > num) {
			endRange = num;
		}

		String next = "";
		if (endRange > 0) {
			for (int i = page + 1; i < (page + endRange + 1); i++) {
				next += "<a href=\"" + link + String.valueOf(i) + "\">" + String.valueOf(i) + "</a>&nbsp;";
			}
		}

		linkString += last + "<strong>" + String.valueOf(page) + "</strong>&nbsp;" + next;
		if (page != pageTotal && pageTotal > 0) {
			linkString += "<a href=\"" + link + String.valueOf(page + 1) + "\">&gt;</a>&nbsp;";
			linkString += "<a href=\"" + link + String.valueOf(pageTotal) + "\">&gt;&gt;|</a>";
		}
		
		return linkString;
	}
}