集合对象分页通用方法（忘记在哪里找到的）

最新推荐文章于 2025-02-25 16:28:37 发布

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该博客展示了一个Java的ListPageUtil工具类，用于对集合进行分页操作。类中包含原集合、当前页、每页条数等属性，提供了获取分页参数和分页后数据的方法，还给出了使用示例，可帮助开发者实现集合的分页功能。

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public class ListPageUtil<T> {
/**原集合*/
private List<T> data;

/** 上一页 */
private int lastPage;

/** 当前页 */
private int nowPage;

/** 下一页 */
private int nextPage;
//
/** 每页条数 */
private int pageSize;

/** 总页数 */
private int totalPage;

/** 总数据条数 */
private int totalCount;


/**
* 获取分页的参数
* @param data list集合
* @param pageSize 一页显示的数量
*/
public ListPageUtil(List<T> data,int pageSize) {
if (data == null || data.isEmpty()) {
throw new IllegalArgumentException("data must be not empty!");
}

this.data = data;
this.pageSize = pageSize;
/*this.totalPage = data.size()/pageSize;
if(data.size()%pageSize!=0){
this.totalPage++;
}*/

this.totalCount = data.size();
this.totalPage = (totalCount + pageSize - 1) / pageSize;
this.lastPage = nowPage-1>1? nowPage-1:1;
this.nextPage = nowPage>=totalPage? totalPage: nowPage + 1;
}





public ListPageUtil(List<T> data,int nowPage,int pageSize) {
if (data == null || data.isEmpty()) {
throw new IllegalArgumentException("data must be not empty!");
}

this.data = data;
this.pageSize = pageSize;
/*this.totalPage = data.size()/pageSize;
if(data.size()%pageSize!=0){
this.totalPage++;
}*/

this.nowPage = nowPage;
this.totalCount = data.size();
this.totalPage = (totalCount + pageSize - 1) / pageSize;
this.lastPage = nowPage-1>1? nowPage-1:1;
this.nextPage = nowPage>=totalPage? totalPage: nowPage + 1;

}

/**
* 得到分页后的数据
*
* @param pageNum 页码
* @return 分页后结果
*/
public List<T> getPagedList() {
int fromIndex = (nowPage - 1) * pageSize;
if (fromIndex >= data.size()) {
return Collections.emptyList();//空数组
}
if(fromIndex<0){
return Collections.emptyList();//空数组
}
int toIndex = nowPage * pageSize;
if (toIndex >= data.size()) {
toIndex = data.size();
}
return data.subList(fromIndex, toIndex);
}

public int getPageSize() {
return pageSize;
}

public List<T> getData() {
return data;
}
public int getLastPage() {
return lastPage;
}

public int getNowPage() {
return nowPage;
}

public int getNextPage() {
return nextPage;
}

public int getTotalPage() {
return totalPage;
}

public int getTotalCount() {
return totalCount;
}

public static void main(String[] args) {
Integer[] array = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12};
List<Integer> list = Arrays.asList(array);

ListPageUtil<Integer> listPageUtil = new ListPageUtil<Integer>(list,2, 2);
List<Integer> pagedList = listPageUtil.getPagedList();
System.out.println(pagedList);
}
}