shoppager.java

jsp网站开发四“酷”全书原码

package com.publish.shop.taglib;

import java.util.ArrayList;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspTagException;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.tagext.TagSupport;
import com.publish.shop.util.javabeans.SessionWrapper;
import com.publish.shop.util.javabeans.Utility;
import com.publish.shop.util.javabeans.Constants;
import com.publish.shop.util.javabeans.Pager;

public class ShopPager extends TagSupport {
  private String csContextPath = "";
  private String csImgPath = "";

  public ShopPager()
  {
  }

  public int doStartTag()  throws JspException
  {
    try{
      HttpServletRequest req = (HttpServletRequest)pageContext.getRequest();
      csContextPath = req.getContextPath();
      csImgPath=csContextPath+"/images/";
      Pager pager = (Pager)req.getAttribute(Constants.Pager_Session);
      JspWriter jspwriter = pageContext.getOut();
      String allSizeString = Utility.getMessage("label.allSize");
      String record = Utility.getMessage("label.record");
      if(pager.getSize()==0){
        jspwriter.print(allSizeString+"0"+record);
      }else{
        jspwriter.print(allSizeString+pager.getSize()+record+"  ");
        jspwriter.print(Utility.getMessage("label.currentPage")+pager.getBegin()+"-"+pager.getEnd()+record+"  ");
        if(pager.getBegin()>1)
          jspwriter.print("<a href=\"javascript: var form=document.formpage; form.pagerOffSet.value='"+(pager.getBegin()-pager.getLength())+"'; form.strutsAction.value='0';form.submit();\">"+Utility.getMessage("label.prePage")+"</a>");
        if(pager.getEnd()<pager.getSize())
          jspwriter.print("&nbsp;<a href=\"javascript: var form=document.formpage; form.pagerOffSet.value='"+(pager.getEnd()+1)+"'; form.strutsAction.value='0';form.submit();\">"+Utility.getMessage("label.nextPage")+"</a>");
      }
    }//end of try
    catch(Exception ex)
    {
      ex.printStackTrace();
      throw new JspTagException(ex.getMessage());
    }
    return 0;
  }
}