showonline_jsp.java

用jsp实现在线留言！采用MVC三层架构！

package org.apache.jsp.inc;

import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.jsp.*;
import java.sql.*;

public final class showonline_jsp extends org.apache.jasper.runtime.HttpJspBase
    implements org.apache.jasper.runtime.JspSourceDependent {


  String  DateToString(){
	  String str;
	  //int i,j;
	  java.util.Date date = new java.util.Date();
	  str=String.valueOf(date.getTime());
	  //i=str.length();
	  //j=i-9;
	  str=str.substring(0,9);
	  return str;
  }

 String sql,Time_Str,User_List,Guest_List,UserName;
    long Online_Time;
    int Guest_Num,User_Num;

  private static java.util.List _jspx_dependants;

  public Object getDependants() {
    return _jspx_dependants;
  }

  public void _jspService(HttpServletRequest request, HttpServletResponse response)
        throws java.io.IOException, ServletException {

    JspFactory _jspxFactory = null;
    PageContext pageContext = null;
    HttpSession session = null;
    ServletContext application = null;
    ServletConfig config = null;
    JspWriter out = null;
    Object page = this;
    JspWriter _jspx_out = null;
    PageContext _jspx_page_context = null;


    try {
      _jspxFactory = JspFactory.getDefaultFactory();
      response.setContentType("text/html; charset=gb2312");
      pageContext = _jspxFactory.getPageContext(this, request, response,
      			null, true, 8192, true);
      _jspx_page_context = pageContext;
      application = pageContext.getServletContext();
      config = pageContext.getServletConfig();
      session = pageContext.getSession();
      out = pageContext.getOut();
      _jspx_out = out;

      out.write('\r');
      out.write('\n');
      yy.jdbc yy = null;
      synchronized (_jspx_page_context) {
        yy = (yy.jdbc) _jspx_page_context.getAttribute("yy", PageContext.PAGE_SCOPE);
        if (yy == null){
          yy = new yy.jdbc();
          _jspx_page_context.setAttribute("yy", yy, PageContext.PAGE_SCOPE);
        }
      }
      out.write("\r\n");
      out.write("\r\n");
      out.write('\r');
      out.write('\n');
      out.write('\r');
      out.write('\n');

 Guest_List="";
 User_List="";
 
 Connection con=yy.getConn();
 Statement  stmt=con.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_READ_ONLY);
 ResultSet rs=null;


  sql="select * from 在线 where 在线id='"+session.getId()+"'";
  rs=stmt.executeQuery(sql);
  rs.last();
  if (rs.getRow()>0)
	  {
  if (session.getValue("UserName")==null)
  sql="update 在线 set 在线后面时间='"+yy.getTime()+"',在线最后时间='"+DateToString()+"' where 在线id='"+session.getId()+"'";
  else
  sql="update 在线 set 在线用户名='"+session.getValue("UserName")+"',在线后面时间='"+yy.getTime()+"',在线最后时间='"+DateToString()+"' where 在线id='"+session.getId()+"'";
  stmt.executeUpdate(sql);
  }else
	  {
  sql="insert into 在线(在线id,在线用户名,在线开始时间,在线后面时间,在线最后时间,在线IP地址) ";

  if (session.getValue("UserName")==null)
  sql=sql+" values('"+session.getId()+"','客人','"+yy.getTime()+"','"+yy.getTime()+"','"+DateToString()+"','"+request.getRemoteAddr()+"')";
  else
  sql=sql+" values('"+session.getId()+"','"+session.getValue("UserName")+"','"+yy.getTime()+"','"+yy.getTime()+"','"+DateToString()+"','"+request.getRemoteAddr()+"')";
  //out.println(sql);
  stmt.executeUpdate(sql);
  
  }

  Time_Str=DateToString();
  Online_Time=Integer.parseInt(Time_Str);;
  Online_Time=Online_Time-60;
  sql="delete from 在线 where 在线最后时间<'"+Online_Time+"'";
  stmt.executeUpdate(sql);
  
  
  
  //out.println(Online_Time);
  sql="select 在线用户名 from 在线 where 在线用户名<>'客人' order by 在线最后时间 desc";
  rs=stmt.executeQuery(sql);
  rs.last();
  User_Num=rs.getRow();
  if (User_Num>0)
  {
   for (int i=1;i<=User_Num;i++)
	  {

	UserName=rs.getString("在线用户名");
	User_List=User_List+"<a href=member.jsp?member="+UserName+">"+UserName+"</a>&nbsp;&nbsp";

	}
  }
 sql="select 在线用户名 from 在线 where 在线用户名='客人' order by 在线最后时间 desc";
  rs=stmt.executeQuery(sql);
  rs.last();
  Guest_Num=rs.getRow();

  if (Guest_Num>0)
  {
   for (int i=1;i<=Guest_Num;i++)
	  {
	    Guest_List=Guest_List+"客人&nbsp;&nbsp";

	}
  }




      out.write("\r\n");
      out.write("\t\t<tr bgcolor=\"#9CCFFF\">\r\n");
      out.write("          <td colspan=\"7\" height=\"14\" width=\"734\"><b><font color=\"#333399\">在线人员\r\n");
      out.write("            - 目前有 ");
      out.print(Guest_Num);
      out.write(" 位游客和 ");
      out.print(User_Num);
      out.write(" 位会员在线 </font></b></td>\r\n");
      out.write("        </tr>\r\n");
      out.write("        <tr bgcolor=\"#F7FBFF\">\r\n");
      out.write("          <td align=\"center\" height=\"16\" width=\"15\"><img src=\"image/pmlogin.gif\" width=\"14\" height=\"15\"></td>\r\n");
      out.write("          <td colspan=\"6\" height=\"16\" width=\"703\">");
      out.print(User_List);
      out.print(Guest_List);
      out.write("</td>\r\n");
      out.write("    </tr>");
    } catch (Throwable t) {
      if (!(t instanceof SkipPageException)){
        out = _jspx_out;
        if (out != null && out.getBufferSize() != 0)
          out.clearBuffer();
        if (_jspx_page_context != null) _jspx_page_context.handlePageException(t);
      }
    } finally {
      if (_jspxFactory != null) _jspxFactory.releasePageContext(_jspx_page_context);
    }
  }
}