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
