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