PageObject类实现与分页逻辑-优快云博客

本文介绍了一个PageObject类的设计与实现细节，该类用于处理分页操作，包括设置当前页码、每页显示的记录数及总记录数等属性，并提供了计算总页数、起始位置和结束位置的方法。

public class PageObject {

   public PageObject(Integer page, Integer size) {

       this.page = page;

       if (page < 1) {
           page = 1;
       }
       this.pageSize = size;
   }

   public PageObject() {
       super();
   }

   // 开始索引
   private Integer page;

   // 一页行数
   private Integer pageSize;

   // 总行数
   private Integer totalCount;

   public PageObject(Integer page, Integer size, Integer totalCount) {

       this.page = page;

       if (page < 1) {
           page = 1;
       }
       this.pageSize = size;

       this.totalCount = totalCount;
   }

   @Override
   public String toString() {
       StringBuilder builder = new StringBuilder();
       builder.append("PageObject [page=").append(page).append(", pageSize=")
               .append(pageSize).append(", totalCount=").append(totalCount)
               .append("]");
       return builder.toString();
   }

   public Integer getPage() {
       return page;
   }

   public void setPage(Integer page) {
       this.page = page;
   }

   public Integer getPageSize() {
       return pageSize;
   }

   public void setPageSize(Integer pageSize) {
       this.pageSize = pageSize;
   }

   /*
   * 获取总页数
   */
   public Integer getTotalCount() {
       int count = 0;
       if (this.totalCount > 0) {
           count = this.totalCount % pageSize == 0 ? (this.totalCount / this.pageSize)
                   : (this.totalCount / this.pageSize + 1);
       }
       return count;
   }

   public void setTotalCount(Integer totalCount) {
       this.totalCount = totalCount;
   }

   /*
   * 获取起始位置
   */
   public Integer getStartIndex() {
       int startIndex = (page - 1) * pageSize;
       return startIndex;
   }

   /*
   * 获取结束位置
   */
   public Integer getEndIndex() {
       int endIndex = this.page * this.pageSize;
       return endIndex;
   }
}