chatutils.java

ICE3.3.0--聊天程序服务器端demo

// **********************************************************************
//
// Copyright (c) 2003-2008 ZeroC, Inc. All rights reserved.
//
// This copy of Chat Demo is licensed to you under the terms
// described in the CHAT_DEMO_LICENSE file included in this
// distribution.
//
// **********************************************************************

package ChatDemoGUI;

import java.util.Date;
import java.util.TimeZone;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.io.StringWriter;
import java.io.PrintWriter;

public class ChatUtils
{
    //
    // This function unescapes HTML entities in the data string
    // and return the unescaped string.
    //
    public static String unstripHtml(String data)
    {
        data = data.replace(""", "\"");
        data = data.replace("'", "'");
        data = data.replace("&lt;", "<");
        data = data.replace("&gt;", ">");
        data = data.replace("&amp;", "&");
        return data;
    }

    public static String formatTimestamp(long timestamp)
    {
        DateFormat dtf = new SimpleDateFormat("HH:mm:ss");
        dtf.setTimeZone(TimeZone.getDefault());
        return dtf.format(new Date(timestamp));
    }

    public static String formatUsername(String in)
    {
        try
        {
            in = in.substring(0, 1).toUpperCase() + in.substring(1, in.length()).toLowerCase();
        }
        catch(IndexOutOfBoundsException ex)
        {
        }
        return in;
    }

    public static void validateMessage(String message) throws Chat.InvalidMessageException
    {
        if(message.length() > _maxMessageSize)
        {
            Chat.InvalidMessageException ex = new Chat.InvalidMessageException();
            ex.reason = "Message length exceeded, maximum length is " + _maxMessageSize + " characters.";
            throw ex;
        }

    }

    public static String stack2string(Exception e)
    {
        try
        {
            StringWriter sw = new StringWriter();
            PrintWriter pw = new PrintWriter(sw);
            e.printStackTrace(pw);
            return sw.toString();
        }
        catch(Exception e2)
        {
            return e.toString();
        }
    }

    private static final int _maxMessageSize = 1024;
};