browse_0002ejsp_jsp.java

用JAVA编写的网上书店程序

import java.sql.*;
import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.jsp.*;
import org.apache.jasper.runtime.*;


public class browse_0002ejsp_jsp extends HttpJspBase {

    // begin [file="/browse.jsp";from=(11,0);to=(11,52)]
    // end
    // begin [file="/browse.jsp";from=(12,0);to=(12,78)]
    // end

    static {
    }
    public browse_0002ejsp_jsp( ) {
    }

    private static boolean _jspx_inited = false;

    public final void _jspx_init() throws org.apache.jasper.runtime.JspException {
    }

    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;
        String  _value = null;
        try {

            if (_jspx_inited == false) {
                synchronized (this) {
                    if (_jspx_inited == false) {
                        _jspx_init();
                        _jspx_inited = true;
                    }
                }
            }
            _jspxFactory = JspFactory.getDefaultFactory();
            response.setContentType("text/html; charset=GB18030");
            pageContext = _jspxFactory.getPageContext(this, request, response,
            			"", true, 8192, true);

            application = pageContext.getServletContext();
            config = pageContext.getServletConfig();
            session = pageContext.getSession();
            out = pageContext.getOut();

            // HTML // begin [file="/browse.jsp";from=(0,52);to=(1,0)]
                out.write("\r\n");

            // end
            // HTML // begin [file="/browse.jsp";from=(1,31);to=(2,0)]
                out.write("\r\n");

            // end
            // begin [file="/browse.jsp";from=(2,2);to=(10,0)]
                
                /*检查客户是否通过登录，如果未经过登录检查，返回登录界面。
                *验证用户是否存在，避免用户直接进入该页，以后的每张动态网
                *页都要包括这一部分。*/
                if(session.getAttribute("username")==null)
                {
                  response.sendRedirect("login.html");
                }
            // end
            // HTML // begin [file="/browse.jsp";from=(10,2);to=(11,0)]
                out.write("\r\n");

            // end
            // begin [file="/browse.jsp";from=(11,0);to=(11,52)]
                book.bk bkId = null;
                boolean _jspx_specialbkId  = false;
                 synchronized (pageContext) {
                    bkId= (book.bk)
                    pageContext.getAttribute("bkId",PageContext.PAGE_SCOPE);
                    if ( bkId == null ) {
                        _jspx_specialbkId = true;
                        try {
                            bkId = (book.bk) java.beans.Beans.instantiate(this.getClass().getClassLoader(), "book.bk");
                        } catch (ClassNotFoundException exc) {
                             throw new InstantiationException(exc.getMessage());
                        } catch (Exception exc) {
                             throw new ServletException (" Cannot create bean of class "+"book.bk", exc);
                        }
                        pageContext.setAttribute("bkId", bkId, PageContext.PAGE_SCOPE);
                    }
                 } 
                if(_jspx_specialbkId == true) {
            // end
            // begin [file="/browse.jsp";from=(11,0);to=(11,52)]
                }
            // end
            // HTML // begin [file="/browse.jsp";from=(11,52);to=(12,0)]
                out.write("\r\n");

            // end
            // begin [file="/browse.jsp";from=(12,0);to=(12,78)]
                book.SessionListener SessionListenerId = null;
                boolean _jspx_specialSessionListenerId  = false;
                 synchronized (pageContext) {
                    SessionListenerId= (book.SessionListener)
                    pageContext.getAttribute("SessionListenerId",PageContext.PAGE_SCOPE);
                    if ( SessionListenerId == null ) {
                        _jspx_specialSessionListenerId = true;
                        try {
                            SessionListenerId = (book.SessionListener) java.beans.Beans.instantiate(this.getClass().getClassLoader(), "book.SessionListener");
                        } catch (ClassNotFoundException exc) {
                             throw new InstantiationException(exc.getMessage());
                        } catch (Exception exc) {
                             throw new ServletException (" Cannot create bean of class "+"book.SessionListener", exc);
                        }
                        pageContext.setAttribute("SessionListenerId", SessionListenerId, PageContext.PAGE_SCOPE);
                    }
                 } 
                if(_jspx_specialSessionListenerId == true) {
            // end
            // begin [file="/browse.jsp";from=(12,0);to=(12,78)]
                }
            // end
            // HTML // begin [file="/browse.jsp";from=(12,78);to=(13,0)]
                out.write("\r\n");

            // end
            // begin [file="/browse.jsp";from=(13,2);to=(23,0)]
                
                int PageSize=8;//设置每张网页显示8条记录
                int ShowPage=1;//设置预显示的页数
                int RowCount=0;//ResultSet的记录数
                int PageCount=0;//ResuleSet分页后的总页数
                ResultSet rs=bkId.executeQuery("SELECT * FROM 书籍信息表");
                rs.last();//将指针移到最后一个记录
                RowCount=rs.getRow();//取得结果中的记录数
                //计算显示的页数
                PageCount=((RowCount%PageSize)==0?(RowCount/PageSize):(RowCount/PageSize+1));
            // end
            // HTML // begin [file="/browse.jsp";from=(23,2);to=(40,8)]
                out.write("\r\n<html>\r\n<head>\r\n<title>\r\n迷你书店\r\n</title>\r\n</head>\r\n<body bgcolor=\"#ffffff\">\r\n  <center>\r\n    <font size=5 color=blue>\r\n      欢迎光临\r\n    </font>\r\n  </center>\r\n  <center>\r\n    <p>\r\n      在线人数：\r\n      <font size=\"4\" color=\"red\">\r\n        ");

            // end
            // begin [file="/browse.jsp";from=(40,11);to=(40,39)]
                out.print(SessionListenerId.getCount());
            // end
            // HTML // begin [file="/browse.jsp";from=(40,41);to=(48,8)]
                out.write("\r\n      </font>\r\n    </p>\r\n  </center>\r\n<br >\r\n  <hr >\r\n    <br >\r\n      <center>\r\n        ");

            // end
            // begin [file="/browse.jsp";from=(48,10);to=(62,8)]
                String ToPage=request.getParameter("ToPage");//判断请求页
                        if(ToPage!=null)//判断是否正确取得ToPage参数
                        {
                          ShowPage=Integer.parseInt(ToPage);
                          if(ShowPage>PageCount)
                          {
                            ShowPage=PageCount;
                          }
                          else if(ShowPage<=0)
                          {
                            ShowPage=1;
                          }
                        }
                        rs.absolute(((ShowPage-1)*PageSize+1));//计算欲显示页的第一条记录位置
                        
            // end
            // HTML // begin [file="/browse.jsp";from=(62,10);to=(65,10)]
                out.write("\r\n        <h3>\r\n          当前在第<font size=4 color=red>\r\n          ");

            // end
            // begin [file="/browse.jsp";from=(65,13);to=(65,21)]
                out.print(ShowPage);
            // end
            // HTML // begin [file="/browse.jsp";from=(65,23);to=(67,10)]
                out.write("</font>页，共\r\n          <font size=4 color=red>\r\n          ");

            // end
            // begin [file="/browse.jsp";from=(67,13);to=(67,22)]
                out.print(PageCount);
            // end
            // HTML // begin [file="/browse.jsp";from=(67,24);to=(78,12)]
                out.write("</font>页\r\n        </h3>\r\n        <br>\r\n          <table border=\"1\"width=\"100%\">\r\n            <tr>\r\n              <td width=\"30%\">书名</td>\r\n              <td width=\"30%\">作者</td>\r\n              <td width=\"15%\">价格（元）</td>\r\n              <td width=\"25%\">购书</td>\r\n            </tr>\r\n\r\n            ");

            // end
            // begin [file="/browse.jsp";from=(78,14);to=(82,12)]
                
                            int i=0;
                            while(rs.next()){
                              i=i+1;
                            
            // end
            // HTML // begin [file="/browse.jsp";from=(82,14);to=(84,30)]
                out.write("\r\n            <tr>\r\n              <td width=\"30%\">");

            // end
            // begin [file="/browse.jsp";from=(84,33);to=(84,53)]
                out.print(rs.getString("name"));
            // end
            // HTML // begin [file="/browse.jsp";from=(84,55);to=(85,30)]
                out.write("</td>\r\n              <td width=\"30%\">");

            // end
            // begin [file="/browse.jsp";from=(85,33);to=(85,55)]
                out.print(rs.getString("author"));
            // end
            // HTML // begin [file="/browse.jsp";from=(85,57);to=(86,30)]
                out.write("</td>\r\n              <td width=\"15%\">");

            // end
            // begin [file="/browse.jsp";from=(86,33);to=(86,51)]
                out.print(rs.getInt("price"));
            // end
            // HTML // begin [file="/browse.jsp";from=(86,53);to=(87,56)]
                out.write("</td>\r\n              <td width=\"25%\"><a href=\"cart.jsp?book_id=");

            // end
            // begin [file="/browse.jsp";from=(87,59);to=(87,74)]
                out.print(rs.getInt("id"));
            // end
            // HTML // begin [file="/browse.jsp";from=(87,76);to=(89,12)]
                out.write("\">选购此书</a></td>\r\n            </tr>\r\n            ");

            // end
            // begin [file="/browse.jsp";from=(89,14);to=(95,12)]
                
                            //超过8条
                            if(i==PageSize)
                            {
                              break;
                            }
                            
            // end
            // HTML // begin [file="/browse.jsp";from=(95,14);to=(96,12)]
                out.write("\r\n            ");

            // end
            // begin [file="/browse.jsp";from=(96,14);to=(99,12)]
                
                            }
                            rs.close();
                            
            // end
            // HTML // begin [file="/browse.jsp";from=(99,14);to=(103,14)]
                out.write("\r\n          </table>\r\n          <table>\r\n            <tr valign=\"baseline\" align=\"center\">\r\n              ");

            // end
            // begin [file="/browse.jsp";from=(103,16);to=(108,16)]
                
                              //判断目前所在页号是否为一页，不是则显示到第一页与上一页的超链接
                              if(ShowPage!=1)
                              {
                                //以显示的分页号ToPage为参数，超链接到browse.jsp
                                
            // end
            // HTML // begin [file="/browse.jsp";from=(108,18);to=(110,44)]
                out.write("\r\n                <td width=\"150\">\r\n                  <a Href=browse.jsp?ToPage=");

            // end
            // begin [file="/browse.jsp";from=(110,47);to=(110,57)]
                out.print(ShowPage-1);
            // end
            // HTML // begin [file="/browse.jsp";from=(110,59);to=(113,16)]
                out.write(">到上一页\r\n                  </a>\r\n                </td>\r\n                ");

            // end
            // begin [file="/browse.jsp";from=(113,18);to=(119,16)]
                
                                }
                                //判断目前所在分页是否为最后一页，不是则显示到最后一页与下一页的超链接
                                if(ShowPage!=PageCount)
                                {
                                  //以显示的分页号topage为参数，超链接到browse.jsp
                                
            // end
            // HTML // begin [file="/browse.jsp";from=(119,18);to=(121,44)]
                out.write("\r\n                <td width=\"150\">\r\n                  <a Href=browse.jsp?ToPage=");

            // end
            // begin [file="/browse.jsp";from=(121,47);to=(121,56)]
                out.print(PageCount);
            // end
            // HTML // begin [file="/browse.jsp";from=(121,58);to=(124,16)]
                out.write(">到最后一页\r\n                  </a>\r\n                </td>\r\n                ");

            // end
            // begin [file="/browse.jsp";from=(124,18);to=(127,16)]
                
                                }
                                //利用表单向browse.jsp传送要显示的页号
                                
            // end
            // HTML // begin [file="/browse.jsp";from=(127,18);to=(133,28)]
                out.write("\r\n\r\n                <td width=\"150\">\r\n                  <form action=\"browse.jsp\" method=\"POST\" >\r\n                    到\r\n                    <input type=\"text\"name=ToPage style=\"HEIGHT:25px;WIDTH:40px\"\r\n                      value=");

            // end
            // begin [file="/browse.jsp";from=(133,31);to=(133,39)]
                out.print(ShowPage);
            // end
            // HTML // begin [file="/browse.jsp";from=(133,41);to=(141,0)]
                out.write(">页\r\n                  </form>\r\n                </td>\r\n            </tr>\r\n          </table>\r\n      </center>\r\n</body>\r\n</html>\r\n");

            // end

        } catch (Throwable t) {
            if (out != null && out.getBufferSize() != 0)
                out.clearBuffer();
            if (pageContext != null) pageContext.handlePageException(t);
        } finally {
            if (_jspxFactory != null) _jspxFactory.releasePageContext(pageContext);
        }
    }
}