java中利用List的subList方法实现对List分页（简单易学）

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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