📄 userlimitedfilter.java
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/*
*this file is part of nseer erp
*Copyright (C)2006-2010 Nseer(Beijing) Technology co.LTD/http://www.nseer.com
*
*This program is free software; you can redistribute it and/or
*modify it under the terms of the GNU General Public License
*as published by the Free Software Foundation; either
*version 2 of the License, or (at your option) any later version.
*/
package include.users_lock;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.util.StringTokenizer;
import java.util.Map;
/**
* 用户过滤器:
* 如果用户的数量超过限制,不能正常登录
*
*/
public class UserLimitedFilter implements Filter {
private FilterConfig filterConfig=null;
private int limitation=5;
private int current=0;
private String urls=null;
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain) throws IOException,ServletException {
if(filterConfig==null) {
return;
}
Map users=(Map) filterConfig.getServletContext().getAttribute("user");
if (users!=null) {
current=users.size();
}
//对于几个特殊的页面，不需要用户数过滤束缚
//
if(isSpecial((HttpServletRequest)request)){
//呵呵，什么也不干
} else if(current>=limitation){
PrintWriter out=response.getWriter();
response.setContentType("text/html; charset=GB2312");
out.println("<head>");
out.println("<meta http-equiv=\"Content-Type\" content=\"text/html; charset=UTF-8\">");
out.println("<meta name=\"GENERATOR\" content=\"Microsoft FrontPage 5.0\">");
out.println("<meta name=\"ProgId\" content=\"FrontPage.Editor.Document\">");
out.println("<META HTTP-EQUIV=\"Pragma\" CONTENT=\"no-cache\">");
out.println("<META HTTP-EQUIV=\"Cache-Control\" CONTENT=\"no-cache\">");
out.println("<META HTTP-EQUIV=\"Expires\" CONTENT=\"0\">");
out.println("<title>欢迎进入恩信科技客户关系管理系统</title>");
out.println("<STYLE>");
out.println("A:visited {");
out.println(" TEXT-DECORATION: none");
out.println("}");
out.println("A:active {");
out.println(" TEXT-DECORATION: none");
out.println("}");
out.println("A:hover {");
out.println(" TEXT-DECORATION: underline overline");
out.println("}");
out.println("A:link {");
out.println(" TEXT-DECORATION: none");
out.println("}");
out.println(".t {");
out.println(" LINE-HEIGHT: 1.4");
out.println("}");
out.println("BODY {");
out.println(" FONT-FAMILY: 宋体;");
out.println(" FONT-SIZE: 9pt;");
out.println(" SCROLLBAR-HIGHLIGHT-COLOR: buttonface;");
out.println(" SCROLLBAR-SHADOW-COLOR: buttonface;");
out.println(" SCROLLBAR-3DLIGHT-COLOR: buttonhighlight;");
out.println(" SCROLLBAR-TRACK-COLOR: #eeeeee;");
out.println(" SCROLLBAR-DARKSHADOW-COLOR: buttonshadow;");
out.println(" margin-left: 0px;");
out.println(" margin-top: 0px;");
out.println(" margin-right: 0px;");
out.println(" margin-bottom: 0px;");
out.println("}");
out.println("TD {");
out.println(" FONT-FAMILY: 宋体; FONT-SIZE: 9pt");
out.println("}");
out.println("DIV {");
out.println(" FONT-FAMILY: 宋体; FONT-SIZE: 9pt");
out.println("}");
out.println("FORM {");
out.println(" FONT-FAMILY: 宋体; FONT-SIZE: 9pt");
out.println("}");
out.println("OPTION {");
out.println(" FONT-FAMILY: 宋体; FONT-SIZE: 9pt");
out.println("}");
out.println("P {");
out.println(" FONT-FAMILY: 宋体; FONT-SIZE: 9pt");
out.println("}");
out.println("TD {");
out.println(" FONT-FAMILY: 宋体; FONT-SIZE: 9pt");
out.println("}");
out.println("BR {");
out.println(" FONT-FAMILY: 宋体; FONT-SIZE: 9pt");
out.println("}");
out.println("INPUT {");
out.println(" BORDER-BOTTOM-COLOR: #cccccc; BORDER-BOTTOM-WIDTH: 1px; BORDER-LEFT-COLOR: #cccccc; BORDER-LEFT-WIDTH: 1px; BORDER-RIGHT-COLOR: #cccccc; BORDER-RIGHT-WIDTH: 1px; BORDER-TOP-COLOR: #cccccc; BORDER-TOP-WIDTH: 1px; FONT-SIZE: 9pt; HEIGHT: 18px; PADDING-BOTTOM: 1px; PADDING-LEFT: 1px; PADDING-RIGHT: 1px; PADDING-TOP: 1px");
out.println("}");
out.println("TEXTAREA {");
out.println(" BACKGROUND-COLOR: #efefef; BORDER-BOTTOM-COLOR: #000000; BORDER-BOTTOM-WIDTH: 1px; BORDER-LEFT-COLOR: #000000; BORDER-LEFT-WIDTH: 1px; BORDER-RIGHT-COLOR: #000000; BORDER-RIGHT-WIDTH: 1px; BORDER-TOP-COLOR: #000000; BORDER-TOP-WIDTH: 1px; FONT-FAMILY: 宋体 ; FONT-SIZE: 9pt");
out.println("}");
out.println("SELECT {");
out.println(" BACKGROUND-COLOR: #efefef; BORDER-BOTTOM-COLOR: #000000; BORDER-BOTTOM-WIDTH: 1px; BORDER-LEFT-COLOR: #000000; BORDER-LEFT-WIDTH: 1px; BORDER-RIGHT-COLOR: #000000; BORDER-RIGHT-WIDTH: 1px; BORDER-TOP-COLOR: #000000; BORDER-TOP-WIDTH: 1px; FONT-FAMILY: 宋体 ; FONT-SIZE: 9pt");
out.println("}");
out.println("</STYLE>");
out.println("<!--end css info-->");
out.println("<META content=\"Microsoft FrontPage 4.0\" name=GENERATOR>");
out.println("");
out.println("<STYLE>");
out.println(".gray {");
out.println(" CURSOR: hand; FILTER: gray");
out.println("}");
out.println(".style3 {");
out.println(" font-size: 16px;");
out.println(" font-weight: bold;");
out.println("}");
out.println(".unnamed1 {");
out.println(" border: 1px solid #006600;");
out.println("}");
out.println(".unnamed2 {");
out.println(" border: 1px ridge #666666;");
out.println("}");
out.println(".style8 {color: #000066}");
out.println("</STYLE>");
out.println("</head>");
out.println("<Script Langvage=javascript>");
out.println("function KeyDown(){");
out.println("if ((window.event.altKey)&&");
out.println("((window.event.keyCode==37)||(window.event.keyCode==39))){");
out.println("alert(\"请不要使用ALT+方向键前进或后退网页！\");");
out.println("event.returnValue=false;");
out.println("}");
out.println("");
out.println("if ((event.keyCode==8)||(event.keyCode==116)||(event.ctrlKey && event.keyCode==82)){");
out.println("event.keyCode=0;");
out.println("event.returnValue=false;");
out.println("}");
out.println("if ((event.ctrlKey)&&(event.keyCode==78))");
out.println("event.returnValue=false;");
out.println("if ((event.shiftKey)&&(event.keyCode==121))");
out.println("event.returnValue=false;");
out.println("if (window.event.srcElement.tagName == \"A\" && window.event.shiftKey)");
out.println("window.event.returnValue = false;");
out.println("if ((window.event.altKey)&&(window.event.keyCode==115)){");
out.println("window.showModelessDialog(\"about:blank\",\"\",\"dialogWidth:1px;dialogheight:1px\");");
out.println("return false;}");
out.println("}");
out.println("</script>");
out.println("<body bgcolor=\"#EFEFEF\" onkeydown=\"KeyDown()\" oncontextmenu=\"event.returnValue=true\">");
out.println("<div align=\"center\">");
out.println(" <center>");
out.println(" <table border=\"0\" cellpadding=\"2\" width=\"650\" height=\"10\">");
out.println(" <tr>");
out.println(" <td height=\"15\"></td>");
out.println(" </tr>");
out.println(" </table>");
out.println(" </center>");
out.println("</div>");
out.println("");
out.println("<div align=\"center\">");
out.println(" <center>");
out.println(" <table border=\"0\" cellpadding=\"2\" width=\"650\">");
out.println(" <tr>");
out.println(" <td height=\"10\"></td>");
out.println(" </tr>");
out.println(" </table>");
out.println(" </center>");
out.println("</div>");
out.println("<div align=\"center\">");
out.println(" <center>");
out.println(" <table border=\"0\" cellpadding=\"2\" width=\"650\">");
out.println(" <tr>");
out.println(" <td height=\"5\"></td>");
out.println(" </tr>");
out.println(" </table>");
out.println(" </center>");
out.println("</div>");
out.println("<p> </p>");
out.println("<p> </p>");
out.println("<p> </p>");
out.println(" <div align=\"center\">");
out.println(" <table border=\"0\" cellpadding=\"2\" width=\"650\">");
out.println(" <tr>");
out.println(" <td width=\"100%\">");
out.println(" <p align=\"center\">对不起，您的用户数已经达到最大值！</td>");
out.println(" </tr>");
out.println(" </table>");
out.println("</div>");
out.println("<div align=\"center\">");
out.println(" <center>");
out.println(" <table border=\"0\" cellpadding=\"2\" width=\"650\">");
out.println(" <tr>");
out.println(" <td height=\"5\"></td>");
out.println(" </tr>");
out.println(" </table>");
out.println(" </center>");
out.println("</div>");
out.flush();
return;
}
chain.doFilter(request,response);
}
public void init(FilterConfig filterConfig) {
String li=(String)filterConfig.getServletContext().getAttribute(
"numberLimitation");
try {
limitation=Integer.parseInt(li);
} catch (Exception e) {
limitation=5;
} // end of try-catch
this.filterConfig=filterConfig;
if((urls=filterConfig.getInitParameter("urls"))==null) {
urls=" ";
}
}
public boolean isSpecial(HttpServletRequest request) {
String url=request.getRequestURI();
StringTokenizer st=new StringTokenizer(urls,",");
while (st.hasMoreElements()){
if(url.indexOf(st.nextToken())!=-1){
return true;
}
}
return false;
}
public void destroy() {
this.filterConfig = null;
}
}
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