Java实现非数据库简单分页记录

Java实现非数据库简单分页记录 此demo，适合抓取网页文章。

模拟数据进行测试

import java.util.ArrayList;
import java.util.List;
public class DataPagination {
    public static void main(String[] args) {
        // 假设我们有72条数据
        List<String> data = new ArrayList<>();
        for (int i = 1; i <= 72; i++) {
            data.add("Data " + i);
        }
        // 每页的数据量
        int pageSize = 10;
        // 计算总页数
        int totalPages = (int) Math.ceil((double) data.size() / pageSize);
        // 输出每一页的数据
        for (int pageNum = 1; pageNum <= totalPages; pageNum++) {
            List<String> pageData = getPage(data, pageNum, pageSize);
            System.out.println("Page " + pageNum + ": " + pageData);
        }
    }
    // 获取指定页数的数据
    public static List<String> getPage(List<String> data, int pageNum, int pageSize) {
        List<String> pageData = new ArrayList<>();
        int startIndex = (pageNum - 1) * pageSize;
        int endIndex = Math.min(startIndex + pageSize, data.size());
        for (int i = startIndex; i < endIndex; i++) {
            pageData.add(data.get(i));
        }
        return pageData;
    }
}

运行结果

Page 1: [Data 1, Data 2, Data 3, Data 4, Data 5, Data 6, Data 7, Data 8, Data 9, Data 10]
Page 2: [Data 11, Data 12, Data 13, Data 14, Data 15, Data 16, Data 17, Data 18, Data 19, Data 20]
Page 3: [Data 21, Data 22, Data 23, Data 24, Data 25, Data 26, Data 27, Data 28, Data 29, Data 30]
Page 4: [Data 31, Data 32, Data 33, Data 34, Data 35, Data 36, Data 37, Data 38, Data 39, Data 40]
Page 5: [Data 41, Data 42, Data 43, Data 44, Data 45, Data 46, Data 47, Data 48, Data 49, Data 50]
Page 6: [Data 51, Data 52, Data 53, Data 54, Data 55, Data 56, Data 57, Data 58, Data 59, Data 60]
Page 7: [Data 61, Data 62, Data 63, Data 64, Data 65, Data 66, Data 67, Data 68, Data 69, Data 70]
Page 8: [Data 71, Data 72]

Process finished with exit code 0

Pagination分页实体

public class Pagination {

    private int totalRecords; // 总记录数
    private int totalPages; // 总页数

    // 构造函数
    public Pagination(int totalRecords, int recordsPerPage) {
        // 整除计算页数，如果有余数则页数加1
        int totalPages = (int) Math.ceil((double) totalRecords / recordsPerPage);
        this.totalRecords = totalRecords;
        this.totalPages = totalPages;
    }

    // 获取总记录数
    public int getTotalRecords() {
        return totalRecords;
    }

    // 获取总页数
    public int getTotalPages() {
        return totalPages;
    }


}

运行类

public class Test {
    public static void main(String[] args) {
   // 总记录数为102，每页显示20条记录
        Pagination pagination = new Pagination(102, 20);

        System.out.println("Total records: " + pagination.getTotalRecords()); // 总记录数
        System.out.println("Total pages: " + pagination.getTotalPages()); // 总页数

    }


}

运行结果

Total records: 102
Total pages: 6