JavaEE-- 分页

来源：互联网发布：bt在线播放软件编辑：程序博客网时间：2024/06/05 17:07

package com.qulx.common;

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

/**
*
* @author qulx
* 分页公共类
*
*/

public class PageResultSet {

private Collection data =null ;
private int curPage; //当前页
private int pageSize; //每页显示的行数
private int rowsCount; //总行数
private int pageCount; //总页数

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);
}
/**
* 获取当前页
* @return int
*/
public int getCurPage() {
  return curPage;
}
/**
* 获取总页数
* @return int
*/
public int getPageCount() {
  return pageCount;
}
public int getPageSize() {
  return pageSize;
}
public int getRowsCount() {
  return rowsCount;
}
public int first(){

  return 1;
}

public int last(){

return this.rowsCount;
}
/**
　　 * 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;
}

public boolean isFirst() {
return (curPage==1)?true:false;
}

public boolean isLast() {
return (curPage==pageCount)?true:false;
}

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;
}

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  ";
}else{
  str+="<a href='"+fileName+temp+"cur_page=1'>首页</a> ";
  str+="<a href='"+fileName+temp+"cur_page="+(curPage-1)+"'>上一页</a> ";
}
if(isLast()){
  str+="下一页尾页 ";
}else{
  str+="<a href='"+fileName+temp+"cur_page="+(curPage+1)+"'>下一页</a> ";
  str+="<a href='"+fileName+temp+"cur_page="+pageCount+"'>尾页</a> ";
}
str+=" 共<b>"+rowsCount+"</b>条记录 ";
str+=" 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;
}
}