pagemanage.java

一个完整的网络订餐系统

package com.util;

import java.util.*;

public class PageManage {
  //分页显示数据
  private int currentpage = 1; //当前页
  private int i_page_count = 10; //每页显示数据
  private int totalPagenum = 0; //总页数
  private int totalObjectnum = 0; //总数据条目数
  private List objectList; //需要分页的数据
  private List currentList; //当前页取出的数据;

  public PageManage() {}

  public PageManage(List objectList) {
    this.setObjectList(objectList);
    this.totalObjectnum = this.getTotalObjectnum();
  }

  public int getI_page_count() {
    return i_page_count;
  }

  public List getObjectList() {
    return objectList;
  }

//计算总页数
  public int getTotalPagenum() {
    if (totalObjectnum % i_page_count == 0) {
      totalPagenum = totalObjectnum / i_page_count;
    }
    else {
      totalPagenum = totalObjectnum / i_page_count + 1;
    }
    return totalPagenum;
  }

  public int getTotalObjectnum() {
    return this.getObjectList().size();
  }

  public int getCurrentpage() {
    return currentpage;
  }

  //获得当前页的list数据
  public List getCurrentList() {
    this.currentList = null;
    this.currentList = new ArrayList();
    int begin_num = currentpage * i_page_count - i_page_count + 1; //开始取的数据位置
    //System.out.println("开始数据 ＝ "+begin_num);
    int isbegin = 1;
    int isend = 0;
    for (int index = 0; index < this.getTotalObjectnum(); index++) {
      if (isbegin < begin_num) {
        isbegin = isbegin + 1;
        continue; //如果小于要开始取的数据位置，则继续循环；
      }
      else if (isend < i_page_count) { //如果已经取了每页需要显示的数据条数，则跳出循环不再取数据
        this.currentList.add(this.objectList.get(index));
        isend = isend + 1;
      }
      else {
        break;
      }
    }

    return this.currentList;
  }

  public void setI_page_count(int i_page_count) {
    this.i_page_count = i_page_count;
  }

  public void setObjectList(List objectList) {
    this.objectList = objectList;
  }

  public void setTotalPagenum(int totalPagenum) {
    this.totalPagenum = totalPagenum;
  }

  public void setTotalObjectnum(int totalObjectnum) {
    this.totalObjectnum = this.getObjectList().size();
  }

  public void setCurrentpage(int currentpage) {
    if (currentpage < 1) {
      currentpage = 1;
    }
    if (currentpage > this.totalPagenum) {
      currentpage = this.totalPagenum;
    }
    this.currentpage = currentpage;
  }

}