ssm整合之四 分页

package com.util;

import java.util.List;

/**
类名：PageData.java
创建人: zh
修改人:
完成功能:分页返回用
*/
public class PageData{

    //列表
    private  List list;
    //行数
    private int count;

    public PageData(){
    }

    public <T> PageData(int count,List<T> list)
    {
        this.count=count;
        this.list=list;
    }
    public List getList() {
        return list;
    }
    public void setList(List list) {
        this.list = list;
    }
    public int getCount() {
        return count;
    }
    public void setCount(int count) {
        this.count = count;
    }


}

package com.util;


import java.io.UnsupportedEncodingException;
import java.util.Enumeration;

import javax.servlet.http.HttpServletRequest;

public class PageUtil {

    private int  recordCount,pageSize,pageNo;//总数量   每页显示数量   页数
    private int pageCount=0;//总页数
    private String pageString,css="", url="";
    /**
     * 构造方法，初始化其他参数
     * @param pageSize
     * @param pageNo
     * @param recordCount
     * @param request
     */
    public PageUtil(int pageSize,int pageNo,int recordCount,HttpServletRequest request)
    {
        this.pageNo=pageNo;
        this.recordCount=recordCount;
        if(this.recordCount<0)
            this.recordCount=0;
        this.pageSize=pageSize;
        //链接地址
        this.url=request.getRequestURI()+"?";
        Enumeration  pNames=request.getParameterNames();  
         while(pNames.hasMoreElements()){  
          String  name=(String)pNames.nextElement();
          if( name.equalsIgnoreCase("pageNo")==false )
            {
              if(url.charAt(url.length()-1)=='?')
                  url+=name+"="+request.getParameter(name);
              else
                  url+="&"+name+"="+request.getParameter(name);
            }
          }
         if(url.charAt(url.length()-1)!='?')
         {
             url+="&";
         }
    }
    /**
     * 计算拼接分页字符串
     * @return
     */
    public String getPageString()
    {

        if(recordCount%pageSize==0)
        {
            pageCount=recordCount/pageSize;
        }
        else
        {
            pageCount=recordCount/pageSize+1;
        }

        //当前页
        if(pageNo<1)
        {
            pageNo=1;
        }
        //尾页
        if(pageNo>pageCount)
        {
            pageNo=pageCount;
        }

        //上页和首页
        if (pageNo>1)
        {
            pageString="<a href='"+url+"pageNo=1'><font class='"+css+"'>首页</font></a> ";
            pageString+="<a href='"+url+"pageNo="+(pageNo-1)+"'><font class='"+css+"'>上页</font></a> ";
        }
        else
        {
            pageString="<font class='"+css+"'>首页</font> ";
            pageString+="<font class='"+css+"'>上页</font> ";
        }


        pageString+="<font color=red>"+pageNo+"</font> ";

        //下页和尾页
        if(pageNo<pageCount)
        {
            pageString+="<a href='"+url+"pageNo="+(pageNo+1)+"' class='"+css+"'>下页</a> ";
            pageString+="<a href='"+url+"pageNo="+pageCount+"' class='"+css+"'>尾页</a> ";
        }
        else
        {
            pageString+="<font class='"+css+"'>下页</font> ";
            pageString+="<font class='"+css+"'>尾页</font>";
        }
        //跳转页
        pageString+="  转到第<select id=pageNo onchange=\"window.location.href='"+url+"pageNo='+this.value\">";;
        for(int i=1;i<=this.pageCount;i++) {
                if( pageNo==i) {
                    pageString+="<option value="+i+" selected>"+i+"</option>";
                } else {
                    pageString+="<option value="+i+">"+i+"</option>";
                }
        }
            pageString+="</select>页";

        return "<div align=center class="+css+">共"+pageCount+"页,"+recordCount+"条记录  "+pageString+"</div>";      
    }
    public void setPageNo(int pageNo) 
    {
        this.pageNo=pageNo;
    }

    public void setCss(String css) 
    {
        this.css=css;
    }

    public void setUrl(String url) 
    {
        this.url=url;
    }
    public static void main(String[] args) {
        System.out.println("abc".charAt("abc".length()-1));
    }
}

Enumeration  pNames=request.getParameterNames();  
     while(pNames.hasMoreElements()){  
      String  name=(String)pNames.nextElement();
      if( name.equalsIgnoreCase("pageNo")==false )
      {
        if(url.charAt(url.length()-1)=='?')
          url+=name+"="+request.getParameter(name);
        else
          url+="&"+name+"="+request.getParameter(name);
      }
      }
     if(url.charAt(url.length()-1)!='?')
     {
       url+="&";
     }