JAVA常用的分页方式

常见的分页方式

1、guava分页

• 引入maven依赖

  
  	com.google.guava
  	guava
  	21.0
  
  

• 示例1

  @Test
  public void test() {
      // 准备数据
      ArrayList<Integer> list = Lists.newArrayList(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);
  
      // 将集合list按照 2 个元素一份进行划分
      List<List<Integer>> partition = Lists.partition(list, 2);
      for (List<Integer> nums : partition) {
        // 你需要处理的业务逻辑
        System.out.println(nums);
      }
  }
  

• 示例2

  private List partition(ArrayList list, int pageSize, int pageNum) {
      // 将 List 按照 PageSzie 拆分
      List> partition = Lists.partition(list, pageSize);
      // 总页数
      int pages = partition.size();
      pageNum = pageNum <= 0 ? 0 : (pageNum <= (pages - 1) ? pageNum : (pages - 1));
      return partition.get(pageNum);
  }
  
  public void partitionTest() {
      int pageSize = 4; // 每一页显示的数量
      int pageNum = 3; // 页码
   
      // 准备数据
      ArrayList list = Lists.newArrayList(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);
          
      System.out.println(partition(list, pageSize, -1));
      System.out.println(partition(list, pageSize, 0));
      System.out.println(partition(list, pageSize, 1));
      System.out.println(partition(list, pageSize, 4));
  }
  

2、MyBatis 分页插件 PageHelper

• 引入pom

  
      com.github.pagehelper
      pagehelper
      5.0.1
  
  

• 示例

  import java.util.ArrayList;
  import java.util.List;
   
  import com.github.pagehelper.Page;
  import com.github.pagehelper.PageInfo;
   
  public class TestListPage {
      public static void main(String[] args) {
          List<String> list = new ArrayList<>();
          for (int i = 0; i < 10; i++) {
              list.add(i + 1 + "");
          }
          int currentPage = 1;
          int pageSize = 3;
         
          PageInfo<String> queryPageInfo = queryPageInfo(currentPage, pageSize, list);
          System.out.println("总条数：" + queryPageInfo.getTotal());
          System.out.print("数据：");
          queryPageInfo.getList().forEach(e -> System.out.print(e));
          System.out.println("当前页：" + queryPageInfo.getPageNum());
          System.out.println("每页个数：" + queryPageInfo.getPageSize());
          System.out.println("总页数：" + queryPageInfo.getPages());
      }
   
      /**
       * 处理List集合数据进行分页
       *
       * @param currentPage 当前页
       * @param pageSize    每页数据个数
       * @param list        进行分页的数据
       * @param 
       * @return
       */
      public static <T> PageInfo<T> queryPageInfo(int currentPage, int pageSize, List<T> list) {
          int total = list.size();
          if (total > pageSize) {
              int toIndex = pageSize * currentPage;
              if (toIndex > total) {
                  toIndex = total;
              }
              list = list.subList(pageSize * (currentPage - 1), toIndex);
          }
          Page<T> page = new Page<>(currentPage, pageSize);
          page.addAll(list);
          page.setPages((total + pageSize - 1) / pageSize);
          page.setTotal(total);
   
          PageInfo<T> pageInfo = new PageInfo<>(page);
          return pageInfo;
      }
   
  }
  

希望对你有所帮助～