📄 srv_jchat.java
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import java.io.*;import java.util.*;import javax.servlet.*;import javax.servlet.http.*;import org.ansurgen.jchat.Channel;import org.ansurgen.jchat.User;import org.ansurgen.jchat.Message;import org.ansurgen.jchat.PrivateMessage;/**<pre>Srv_JChat.javaSee the README.txt file that come with this distribution forinstallation instructions@author ttimoteo@ansurgen.org@version 1.0 09-NOV-1998@see org.ansurgen.jchat.Channel@see org.ansurgen.jchat.User@see org.ansurgen.jchat.Message@see org.ansurgen.jchat.PrivateMessage</pre>*/public class Srv_JChat extends HttpServlet { private final boolean ALLOW_HTML = false; private final int MAX_USERS_PER_CHANNEL = 15; private final int MAX_MESSAGES_PER_CHANNEL = 20; private final int MAX_PVT_MESSAGES_PER_CHANNEL = 10; private final int MAX_LATENT_TIME = 5;//...in minutes private final String DEFAULT_URL = "http://www.ansurgen.org/servlets/Srv_JChat"; private final String ABOUT_URL = "http://www.ansurgen.org/board/ttimoteo/jchat/about_jchat.html"; private String DEFAULT_LOGIN_MESSAGE = "<b>HAS JOINED"; //username will be prepended... private String DEFAULT_LOGOUT_MESSAGE = "<b>HAS LEFT"; //username will be prepended... private int user_count; private int message_count; private Date date; //to add a channel, add it here private String[] channels_array = {"ANSURGEN","Java","Perl","ColdFusion","Merlot","Pacifico","Judo","Paratrooper","BigLlama","FunkBucket","BBShelly_1","BBShelly_2"}; private Hashtable channels_hash; public void init(ServletConfig config) throws ServletException{ user_count = 0; message_count = 0; channels_hash = new Hashtable(); date = new Date(); for (int i=0; i < channels_array.length; i++) { Channel channel = new Channel(channels_array[i], MAX_MESSAGES_PER_CHANNEL, MAX_USERS_PER_CHANNEL, MAX_PVT_MESSAGES_PER_CHANNEL, MAX_LATENT_TIME); channels_hash.put(channels_array[i], channel); } }//init() public void doGet(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException{ res.setContentType("text/html"); ServletOutputStream out = res.getOutputStream(); out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 3.2 Final//EN\">"); out.println("<HTML>"); out.println("<HEAD>"); out.println("<TITLE>JChat Login</TITLE>"); out.println("<script language=Javascript>"); out.println(" function validate(){"); out.println(" if(validateUserName() && validateChannel() && validateEmail()){"); out.println(" return true;"); out.println(" }"); out.println(" return false;"); out.println(" }"); out.println(" function validateUserName(){"); out.println(" user = document.jchat.str_user_name.value;"); out.println(" if(user.length == 0){"); out.println(" alert('You must specify a UserName!');"); out.println(" document.jchat.str_user_name.focus();"); out.println(" return false;"); out.println(" }else if(user.indexOf(\" \") > 0){"); out.println(" alert('UserName cannot contain white space!');"); out.println(" document.jchat.str_user_name.focus();"); out.println(" return false;"); out.println(" }"); out.println(" return true;"); out.println(" }"); out.println(" function validateEmail(){"); out.println(" email = document.jchat.str_email.value;"); out.println(" if(email.length > 0){"); out.println(" at = email.indexOf(\"@\");"); out.println(" dot = email.lastIndexOf(\".\");"); out.println(" n = email.length;"); out.println(" if(at < 1 || at >= dot || (dot+2) >= n){"); out.println(" alert('Invalid email! Use a valid address or leave it blank.');"); out.println(" document.jchat.str_email.focus();"); out.println(" return false;"); out.println(" }"); out.println(" }"); out.println(" return true;"); out.println(" }"); out.println(" function validateChannel(){"); out.println(" var n = document.jchat.str_channel.length;"); out.println(" for (i=0; i<n; i++) {"); out.println(" if (document.jchat.str_channel.options[i].selected) {"); out.println(" if (document.jchat.str_channel.options[i].value == \"FULL\") {"); out.println(" alert('Selected channel is FULL! Try again later');"); out.println(" return false;"); out.println(" }"); out.println(" }"); out.println(" }"); out.println(" return true;"); out.println(" }"); out.println("</script>"); out.println("</HEAD>"); out.println("<BODY bgcolor=white>"); out.println("<form name=\"jchat\" onSubmit=\"return validate()\" method=post action=\"Srv_JChat\">"); out.println("<table border=0 cellspacing=0 cellpadding=0 width=100% height=100%>"); out.println("<tr>"); out.println("<td align=center valign=middle>"); out.println("<img src=\"http://www.ansurgen.org/board/ttimoteo/images/header.gif\" border=0>"); out.println("<table border=0 cellspacing=0 cellpadding=3 width=300 bgcolor=brown>"); out.println("<tr>"); out.println("<th><font face=\"tahoma,verdana,arial\" size=-1 color=white>JChat Login</th>"); out.println("</tr>"); out.println("<tr><td align=center valign=middle><table border=0 cellspacing=0 cellpadding=3 bgcolor=silver width=100%>"); out.println("<tr>"); out.println("<td align=right><font face=\"tahoma,verdana,arial\" size=-1><b>UserName</td>"); out.println("<td><input type=text name=str_user_name size=20 maxlength=20 onChange=\"return validateUserName()\"></td>"); out.println("</tr>"); out.println("<tr>"); out.println("<td align=right><font face=\"tahoma,verdana,arial\" size=-1><b>Email</td>"); out.println("<td><input type=text name=str_email size=20 maxlength=30 onChange=\"return validateEmail()\"></td>"); out.println("</tr>"); out.println("<tr>"); out.println("<td align=right><font face=\"tahoma,verdana,arial\" size=-1><b>Channel</td>"); out.println("<td><select name=str_channel onChange=\"return validateChannel()\">"); Enumeration enum = channels_hash.elements(); int open_channels = 0; while (enum.hasMoreElements()) { Channel channel = (Channel)enum.nextElement(); if (!channel.hasMaxUsers()) { out.println("<option value=\""+channel.getName()+"\">" + channel.getName() + " [" + channel.size() + " users]"); open_channels++; }else{ out.println("<option value=\"FULL\">" + channel.getName() + " [FULL]"); } } if (open_channels == 0) { out.println("<option value=\"FULL\"> ALL CHANNELS FULL"); } out.println("</select>"); out.println("</td>"); out.println("</tr>"); out.println("<tr>"); out.println("<td align=center colspan=2><input type=submit name=\"btn_login\" value=\" Login \"></td>"); out.println("</tr>"); out.println("<tr>"); out.println("<td colspan=2><font face=\"tahoma,verdana,arial\" size=-2>"); out.println(getSettings()); out.println("</td>"); out.println("</tr></table></td>"); out.println("</tr>"); out.println("</table>"); out.println("</td>"); out.println("</tr>"); out.println("</table>"); out.println("</BODY>"); out.println("</HTML>"); } public String getSettings(){ String info = "<a href=\""+ABOUT_URL+"\" target=\"_blank\">@about JChat</a><br>" +"@author: <a href=\"mailto:ttimoteo@ansurgen.org\">ttimoteo@ansurgen.org</a><br>" +"@version: 1.0[alpha] 07NOV1998<br>" +"@servlet_started: "+date+"<br>" +"@max_users_per_channel_setting: " + MAX_USERS_PER_CHANNEL + "<br>" +"@max_messages_per_channel_setting: " + MAX_MESSAGES_PER_CHANNEL + "<br>" +"@max_private_messages_per_channel_setting: " + MAX_PVT_MESSAGES_PER_CHANNEL + "<br>" +"@max_latent_time: " + MAX_LATENT_TIME + "<br>" +"@allow_html: " + ALLOW_HTML; return info; } public void doPost(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException{ res.setContentType("text/html"); ServletOutputStream out = res.getOutputStream(); HttpSession session = req.getSession(true); //parameters... String btn_login = req.getParameter("btn_login"); String btn_logout = req.getParameter("btn_logout"); String btn_post = req.getParameter("btn_post"); String str_user_name = req.getParameter("str_user_name"); String str_email = req.getParameter("str_email"); String str_channel = req.getParameter("str_channel"); String str_message = req.getParameter("str_message"); String str_recipient_id = req.getParameter("str_recipient_id"); //System.out.println("+@params:"); //System.out.println(" +btn_login: " + btn_login); //System.out.println(" +btn_logout: " + btn_logout); //System.out.println(" +btn_post: " + btn_post); //System.out.println(" +str_user_name: " + str_user_name); //System.out.println(" +str_email: " + str_email); //System.out.println(" +str_channel: " + str_channel); //System.out.println(" +str_message: " + str_message); //System.out.println(" +str_recipient_id: " + str_recipient_id); User user = null; if (btn_login != null && str_user_name != null && !str_user_name.equals("")) { user = (User)session.getValue(str_user_name+":"+str_channel); if (user != null) { errorPage(out, "The user_name <i><b>" + str_user_name + "</b></i> is already in use. Pick another name and try again."); return; } user_count++; user = new User(user_count, str_user_name, str_email, str_channel, MAX_LATENT_TIME); session.putValue(str_user_name+":"+str_channel, user); try{ login(user); }catch(Exception e){ e.printStackTrace(); errorPage(out, "Srv_JChat.doPost() -> error during login operation"); return; } }else{ user = (User)session.getValue(str_user_name+":"+str_channel); if (!user.refresh()) { session.removeValue(str_user_name+":"+str_channel); errorPage(out,"Session expired... you must login again"); return; } } if (user == null) { errorPage(out,"Could not find User object in session [Srv_JChat.doPost()] - Your session may have expired (Max Allowable Latent Time: "+MAX_LATENT_TIME+")"); return; } if (btn_logout != null) { try{ logout(user); session.removeValue(str_user_name+":"+str_channel); doGet(req, res); return; }catch(Exception e){ e.printStackTrace(); errorPage(out, "Srv_JChat.doPost() -> error during logout operation"); return; } } try{ Channel channel = getChannel(user.getChannelName()); if (btn_post != null && (str_message != null && !str_message.equals("")) || (str_message != null && !str_message.equals(""))) { if (!ALLOW_HTML) { str_message = replaceHtml(str_message); } if (!str_recipient_id.equals("ALL USERS")) {⌨️ 快捷键说明
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