pageresultset.java

应用系统的权限管理

package com.gmdq.util;

import java.util.Collection;
import java.util.Vector;
import java.util.ArrayList;

/**
 * Created by IntelliJ IDEA.
 * User: zhoudalei
 * Date: 2009-1-21
 * Time: 16:04:38
 * To change this template use File | Settings | File Templates.
 */
public class PageResultSet {
    /**
       * 分页数据
       */
      private Collection data = null;
      /**
       * 当前页
       */
      private int curPage;
      /**
       * 每页显示的记录数
       */
      private int pageSize;
      /**
       * 记录行数
       */
      private int rowsCount;
      /**
       * 页数
       */
      private int pageCount;
      public PageResultSet(Collection data) {
          this.data = data;
          this.curPage = 1;
          this.pageSize = 10;
          this.rowsCount = data.size();
          this.pageCount = (int) Math.ceil((double) rowsCount / pageSize);
      }
      public PageResultSet(Collection data, int curPage) {
          this.data = data;
          this.curPage = curPage;
          this.pageSize = 10;
          this.rowsCount = data.size();
          this.pageCount = (int) Math.ceil((double) rowsCount / pageSize);
      }
      public PageResultSet(Collection data, int curPage, int pageSize) {
          this.data = data;
          this.curPage = curPage;
          this.pageSize = pageSize;
          this.rowsCount = data.size();
          this.pageCount = (int) Math.ceil((double) rowsCount / pageSize);
      }
      /**
       * getCurPage:返回当前的页数
       *
       * @return int
       */
      public int getCurPage() {
          return curPage;
      }
      /**
       * getPageSize：
  .vf]Y5{p}BuC"W
  返回分页大小
       *
       * @return int
       */
      public int getPageSize() {
          return pageSize;
      }
      /**
       * getRowsCount：8NsAX教t$nT"TQ返回总记录行数
       *
       * @return int
       */
      public int getRowsCount() {
          return rowsCount;
      }
      /**
       * getPageCount：返回总页数
       *
       * @return int
       */
      public int getPageCount() {
          return pageCount;
      }
      /**
       * 第一页
       * @return int
       */
      public int first() {
          return 1;
      }
      /**
       * 最后一页
       * @return int
       */
      public int last() {
          return pageCount;
      }
      /**
       * 上一页
       * @return int
       */
      public int previous() {
          return (curPage - 1 < 1) ? 1 : curPage - 1;
      }
      /**
       * 下一页
       * @return int
       */
      public int next() {
          return (curPage + 1 > pageCount) ? pageCount : curPage + 1;
      }
      /**
       * 第一页
       * @return boolean
       */
      public boolean isFirst() {
          return (curPage==1)?true:false;
      }
      /**
       * 第一页
       * @return boolean
       */
      public boolean isLast() {
          return (curPage==pageCount)?true:false;
      }
      /**
       * 获取当前页数据
       * @return Collection
       */
      public Collection getData() {
          Collection curData = null;
          if (data != null) {
              int start = (curPage - 1) * pageSize;
              int end = 0;
              if (start + pageSize > rowsCount)
                  end = rowsCount;
              else
                  end = start + pageSize;
              ArrayList arrayCurData = new ArrayList();
              ArrayList arrayData = null;

              Vector vectorCurData = new Vector();
              Vector vectorData = null;
              boolean isArray = true;
              if (data instanceof ArrayList) {
                  arrayData = (ArrayList) data;
                  isArray = true;
              } else if (data instanceof Vector) {
                  vectorData = (Vector) data;
                  isArray = false;
              }
              for (int i = start; i < end; i++) {
                  if (isArray) {
                      arrayCurData.add(arrayData.get(i));
                  } else {
                      vectorData.add(vectorData.elementAt(i));
                  }
              }
              if (isArray) {
                  curData = (Collection) arrayCurData;
              } else {
                  curData = (Collection) vectorCurData;
              }
          }
          return curData;
      }
      /**
       * 获取工具条
       * @return String
       */
      public String getToolBar(String fileName){
         
          String temp="";
          if(fileName.indexOf("?")==-1)
          {
              temp="?";
          }
          else
          {
              temp="&";
          }
          String str="<form method=\"post\" name=\"frmPage\" action=\""+fileName+"\">";
          str+="<p align=\"center\">";
          if(isFirst())
              str+="首页 上一页&nbsp;";
          else
          {
              str+="<a href=\""+fileName+temp+"cur_page=1\">首页</a>&nbsp;";
              str+="<a href=\""+fileName+temp+"cur_page="+(curPage-1)+"\">上一页</a>&nbsp;";
          }
          if(isLast())
              str+="下一页 尾页&nbsp;";
          else
          {
              str+="<a href=\""+fileName+temp+"cur_page="+(curPage+1)+"\">下一页</a>&nbsp;";
              str+="<a href=\""+fileName+temp+"cur_page="+pageCount+"\">尾页</a>&nbsp;";
          }
          str+="&nbsp;共<b>"+rowsCount+"</b>条记录&nbsp;";
          str+="&nbsp;转到<select name=\"page\" onChange=\"location=\""+fileName+temp+"cur_page=\"+this.options[this.selectedIndex].value\">";
          for(int i=1;i<=pageCount;i++)
          {
              if(i==curPage)
                  str+="<option value=\""+i+"\" selected>第"+i+"页</option>";
              else
                  str+="<option value=\""+i+"\">第"+i+"页</option>";
          }
          str+="</select></p></form>";
          return str;
      }

}