一个简单的对任意list分页的工具-----PageUtil

一、工具类代码

  1 import java.util.List;
  2 import java.util.stream.Collectors;
  3
  4 public class PageUtil<T> {
  5     /**
  6      * 实体类列表
  7      */
  8     List<T> content;
  9     /**
 10      * 是否首页
 11      */
 12     boolean first;
 13     /**
 14      * 是否尾页
 15      */
 16     boolean last;
 17     /**
 18      * 总记录数
 19      */
 20     Integer totalElements;
 21     /**
 22      * 总页数
 23      */
 24     Integer totalPages;
 25
 26     Integer numberOfElements;
 27     /**
 28      * 每页记录数
 29      */
 30     Integer size;
 31     /**
 32      * 当前页
 33      */
 34     Integer number;
 35
 36     @Override
 37     public String toString() {
 38         return "PageUtil{" +
 39                 "content=" + content +
 40                 ", first=" + first +
 41                 ", last=" + last +
 42                 ", totalElements=" + totalElements +
 43                 ", totalPages=" + totalPages +
 44                 ", numberOfElements=" + numberOfElements +
 45                 ", size=" + size +
 46                 ", number=" + number +
 47                 '}';
 48     }
 49
 50     public List<T> getContent() {
 51         return content;
 52     }
 53
 54     public boolean isFirst() {
 55         return first;
 56     }
 57
 58     public boolean isLast() {
 59         return last;
 60     }
 61
 62     public Integer getTotalElements() {
 63         return totalElements;
 64     }
 65
 66     public Integer getTotalPages() {
 67         return totalPages;
 68     }
 69
 70     public Integer getNumberOfElements() {
 71         return numberOfElements;
 72     }
 73
 74     public Integer getSize() {
 75         return size;
 76     }
 77
 78     public Integer getNumber() {
 79         return number;
 80     }
 81
 82     public void pageUtil(Integer page, Integer size, List<T> list){
 83         List<T> list1=list.stream ().skip (page*size).limit (size).collect(Collectors.toList());
 84         int length=list.size ();
 85         this.first=(page==0);//是否第一页
 86         this.last= (page==(length-1)/size);//是否最后一页
 87         this.totalPages =((length-1)/size+1);//总页数
 88         this.totalElements= (length);//总elements
 89         this.size= (size);//每页多少elements
 90         this.content= (list1);//内容
 91         this.numberOfElements =(list1.size ());//当前页elements
 92         this.number= (page);//当前页数，第一页是0
 93     }
 94 }

二、测试

import java.util.Arrays;
import java.util.List;

public class PageTest {
    public static void main(String[] args) {
        int page=1;
        int size=5;
        List<String> stringList= Arrays.asList ("1","2","3","4","5","6","7","8","9","10","11","12","13","14");
        List<Integer> integerList=Arrays.asList (1,2,3,4,5,6,7,8,9,10,11,12,13,14);
        PageUtil<String> stringPageUtil=new PageUtil<> ();
        stringPageUtil.pageUtil (page,size,stringList);
        PageUtil<Integer> integerPageUtil=new PageUtil<> ();
        integerPageUtil.pageUtil (page,size,integerList);
        System.out.println (stringPageUtil);
        System.out.println ("==========================================");
        System.out.println (integerPageUtil);
    }
}

三、结果

PageUtil{content=[6, 7, 8, 9, 10], first=false, last=false, totalElements=14, totalPages=3, numberOfElements=5, size=5, number=1}
==========================================
PageUtil{content=[6, 7, 8, 9, 10], first=false, last=false, totalElements=14, totalPages=3, numberOfElements=5, size=5, numbe