java中利用List的subList方法实现对List分页（简单易学）_java

以下是介绍利用List的subList方法实现对List分页，废话不多说了，直接看代码把

/** *//**
* List分页
* 实现：利用List的获取子List方法，实现对List的分页
* @author 显武
* @date 2010-1-8 16:27:31
*
*/  

import java.util.ArrayList;
import java.util.List;  

public class PageModel {
  private int page = 1; // 当前页  

  public int totalPages = 0; // 总页数  

  private int pageRecorders;// 每页5条数据  

  private int totalRows = 0; // 总数据数  

  private int pageStartRow = 0;// 每页的起始数  

  private int pageEndRow = 0; // 每页显示数据的终止数  

  private boolean hasNextPage = false; // 是否有下一页  

  private boolean hasPreviousPage = false; // 是否有前一页  

  private List list;  

  // private Iterator it;  

  public PageModel(List list, int pageRecorders) {
    init(list, pageRecorders);// 通过对象集，记录总数划分
  }  

  /** *//**
   * 初始化list，并告之该list每页的记录数
   * @param list
   * @param pageRecorders
   */
  public void init(List list, int pageRecorders) {
    this.pageRecorders = pageRecorders;
    this.list = list;
    totalRows = list.size();
    // it = list.iterator();
    hasPreviousPage = false;
    if ((totalRows % pageRecorders) == 0) {
      totalPages = totalRows / pageRecorders;
    } else {
      totalPages = totalRows / pageRecorders + 1;
    }  

    if (page >= totalPages) {
      hasNextPage = false;
    } else {
      hasNextPage = true;
    }  

    if (totalRows < pageRecorders) {
      this.pageStartRow = 0;
      this.pageEndRow = totalRows;
    } else {
      this.pageStartRow = 0;
      this.pageEndRow = pageRecorders;
    }
  }  

  // 判断要不要分页
  public boolean isNext() {
    return list.size() > 5;
  }  

  public void setHasPreviousPage(boolean hasPreviousPage) {
    this.hasPreviousPage = hasPreviousPage;
  }  

  public String toString(int temp) {
    String str = Integer.toString(temp);
    return str;
  }  

  public void description() {  

    String description = "共有数据数:" + this.getTotalRows() +  

    "共有页数: " + this.getTotalPages() +  

    "当前页数为:" + this.getPage() +  

    " 是否有前一页: " + this.isHasPreviousPage() +  

    " 是否有下一页:" + this.isHasNextPage() +  

    " 开始行数:" + this.getPageStartRow() +  

    " 终止行数:" + this.getPageEndRow();  

    System.out.println(description);
  }  

  public List getNextPage() {
    page = page + 1;  

    disposePage();  

    System.out.println("用户凋用的是第" + page + "页");
    this.description();
    return getObjects(page);
  }  

  /** *//**
   * 处理分页
   */
  private void disposePage() {  

    if (page == 0) {
      page = 1;
    }  

    if ((page - 1) > 0) {
      hasPreviousPage = true;
    } else {
      hasPreviousPage = false;
    }  

    if (page >= totalPages) {
      hasNextPage = false;
    } else {
      hasNextPage = true;
    }
  }  

  public List getPreviousPage() {  

    page = page - 1;  

    if ((page - 1) > 0) {
      hasPreviousPage = true;
    } else {
      hasPreviousPage = false;
    }
    if (page >= totalPages) {
      hasNextPage = false;
    } else {
      hasNextPage = true;
    }
    this.description();
    return getObjects(page);
  }  

  /** *//**
   * 获取第几页的内容
   *
   * @param page
   * @return
   */
  public List getObjects(int page) {
    if (page == 0)
      this.setPage(1);
    else
      this.setPage(page);
    this.disposePage();
    if (page * pageRecorders < totalRows) {// 判断是否为最后一页
      pageEndRow = page * pageRecorders;
      pageStartRow = pageEndRow - pageRecorders;
    } else {
      pageEndRow = totalRows;
      pageStartRow = pageRecorders * (totalPages - 1);
    }  

    List objects = null;
    if (!list.isEmpty()) {
      objects = list.subList(pageStartRow, pageEndRow);
    }
    //this.description();
    return objects;
  }  

  public List getFistPage() {
    if (this.isNext()) {
      return list.subList(0, pageRecorders);
    } else {
      return list;
    }
  }  

  public boolean isHasNextPage() {
    return hasNextPage;
  }  

  public void setHasNextPage(boolean hasNextPage) {
    this.hasNextPage = hasNextPage;
  }  

  public List getList() {
    return list;
  }  

  public void setList(List list) {
    this.list = list;
  }  

  public int getPage() {
    return page;
  }  

  public void setPage(int page) {
    this.page = page;
  }  

  public int getPageEndRow() {
    return pageEndRow;
  }  

  public void setPageEndRow(int pageEndRow) {
    this.pageEndRow = pageEndRow;
  }  

  public int getPageRecorders() {
    return pageRecorders;
  }  

  public void setPageRecorders(int pageRecorders) {
    this.pageRecorders = pageRecorders;
  }  

  public int getPageStartRow() {
    return pageStartRow;
  }  

  public void setPageStartRow(int pageStartRow) {
    this.pageStartRow = pageStartRow;
  }  

  public int getTotalPages() {
    return totalPages;
  }  

  public void setTotalPages(int totalPages) {
    this.totalPages = totalPages;
  }  

  public int getTotalRows() {
    return totalRows;
  }  

  public void setTotalRows(int totalRows) {
    this.totalRows = totalRows;
  }  

  public boolean isHasPreviousPage() {
    return hasPreviousPage;
  }  

}  

//测试类：
package com.Gavin.tools.util;  

import java.util.ArrayList;
import java.util.List;  

public class TestPagerModel {
  public static void main(String args[]) {
    List<String> list = new ArrayList<String>();
    list.add("a");
    list.add("b");
    list.add("c");
    list.add("d");
    list.add("e");
    list.add("f");
    list.add("g");
    list.add("h");
    list.add("h");
    list.add("i");
    list.add("j");
    list.add("k");
    list.add("l");
    list.add("m");
    PageModel pm = new PageModel(list, 5);  

    List sublist = pm.getObjects(3);
    for(int i = 0; i < sublist.size(); i++) {
      System.out.println(sublist.get(i));
    }
    System.out.println(sublist.get(0));
  }  

} 

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