📄 chat_sendmsg.java
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package ec;import javax.servlet.*;import javax.servlet.http.*;import java.io.*;import java.util.*;public class chat_sendmsg extends HttpServlet { private static final String CONTENT_TYPE = "text/html; charset=GBK"; /**Initialize global variables*/ public void init() throws ServletException { } //define a useful function which will be used by the following code public void clearVector() { Vector _tempchatMsg=(Vector)getServletContext().getAttribute("chatMsg"); if (_tempchatMsg.size()>40) { _tempchatMsg.removeAllElements(); _tempchatMsg.addElement("<font color='orange' size='2'>"+"系统管理员清除了消息队列，大家慢聊"+".</font><br>"); } } /**Process the HTTP Get request*/ public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType(CONTENT_TYPE); PrintWriter out = response.getWriter(); out.println("<html>"); out.println("<head><title>chat_sendmsg</title></head>"); out.println("<body>"); out.println("<p>The servlet has received a GET. This is the reply.</p>"); out.println("</body></html>"); } /**Process the HTTP Post request*/ public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType(CONTENT_TYPE); PrintWriter out = response.getWriter(); HttpSession session=request.getSession(true); out.println("<html>"); out.println(" <title>发送聊天信息</title>"); out.println("<head>"); out.println("<script language=\"JavaScript\" type=\"text/javascript\">"); out.println("function setCookie()"); out.println("{"); out.println(" document.cookie=form1.toTalk.selectedIndex+\"#\";"); out.println("}"); out.println("function setFocus()"); out.println("{"); out.println(" form1.message.focus();"); out.println(" var cookieValue=document.cookie;"); out.println(" var formValue=cookieValue.split(\"#\");"); out.println(" form1.toTalk.selectedIndex=formValue[1];"); out.println(" _formValue=formValue[0].split(\";\");"); out.println("}"); out.println("</script>"); out.println("</head>"); out.println("<body bgcolor=\"#CCCCFF\" onload=\"setFocus()\">"); //*********************************************************************************************** //初始化一些常用的变量 boolean boolcanupdatemsg=true; Vector tempchatMsg=(Vector)getServletContext().getAttribute("chatMsg"); String cUserName=(String)session.getAttribute("username"); Date userTime=new Date(); String timestamp="["+userTime.getHours()+":"+userTime.getMinutes()+":"+userTime.getSeconds()+"]"; //*********************************************************************************************** //*********************************************************************************************** //receive some parameter and analysis them byte[] temp_t; String temp_p; temp_p=request.getParameter("message"); temp_t=temp_p.getBytes("ISO8859-1"); String temp=new String(temp_t); byte[] talkTo_t; String talkTo_p; talkTo_p=request.getParameter("toTalk"); talkTo_t=talkTo_p.getBytes("ISO8859-1"); String talkTo=new String(talkTo_t); //analysis the parameter if(temp.startsWith("<")) { temp="<font color='red' size='2'>请不要使用html标记"+timestamp+"</font><br>"; tempchatMsg.addElement(temp); boolcanupdatemsg=false; getServletContext().setAttribute("chatMsg",tempchatMsg); } if (temp.endsWith("/>")) { temp="<font color='red' size='2'>请不要使用html标记"+timestamp+"</font><br>"; tempchatMsg.addElement(temp); boolcanupdatemsg=false; getServletContext().setAttribute("chatMsg",tempchatMsg); } if (talkTo.equals("all")) { talkTo="每一个人"; } cUserName="<font color='red' size='2'>"+cUserName+"</font>"; talkTo="<font color='#0000FF' size='2'>"+talkTo+"</font>"; if (boolcanupdatemsg==true) { //update some msg so that the user have the asbility to update the msg Hashtable userLife=(Hashtable)getServletContext().getAttribute("userLife"); userLife.put((String)session.getValue("username"),new Long(userTime.getTime())); getServletContext().setAttribute("userLife",userLife); //************************************************************** } if (boolcanupdatemsg==true) { tempchatMsg.addElement(cUserName+"对"+talkTo+"说："+temp); getServletContext().setAttribute("chatMsg",tempchatMsg); } out.println("<form action=\"\" method=\"post\" onsubmit=\"setCookie()\" id=\"form1\">"); out.println(" <table border=\"0\" cellspacing=\"3\" cellpadding=\"0\">"); out.println(" <tr>"); out.println(" <td>"+session.getValue("username")+"</td>"); out.println(" <td align=\"left\" colspan=\"2\"> "); out.println(" <input name=\"message\" style=\"HEIGHT: 21px; WIDTH: 367px\">"); out.println(" </td>"); out.println(" </tr>"); out.println(" <tr> "); out.println(" <td align=\"center\"> "); out.println(" 对象 "); out.println(" </td>"); out.println(" <td align=\"left\"> "); out.println(" <!--在一个下拉列表中显示所有用户名供用户选择-->"); out.println(" <select name=\"toTalk\"> "); out.println(" <option value=\"all\">全体在聊</option>"); Vector tempuser=(Vector)getServletContext().getAttribute("chatUser"); for (int i=0;i<tempuser.size();i++) { out.println("<option>"); out.println(tempuser.elementAt(tempuser.size()-i-1).toString()); out.println("</option>"); } out.println(" </select>"); out.println(" <input type=\"submit\" value=\"说话呀\" name=\"submit\">"); out.println(" </td>"); out.println(" <td>"); out.println(" <a href=\"ec.chat_leavechat\" target=\"_top\">离开聊天室</a>"); out.println(" </td>"); out.println(" </tr>"); out.println(" </table>"); out.println("</form> "); out.println("</body>"); out.println("</html>"); } /**Clean up resources*/ public void destroy() { }}⌨️ 快捷键说明
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