通用的分页模型实现.

分页模型类:

package selfimpr.page;

import java.util.List;

/**
 * 分页模型
 * @param <T> 数据泛型
 * @author selfimpr
 * @blog http://blog.csdn.net/lgg201
 * @email [e-mail]
 */
public class PageModel<T> {
	private int total;
	
	private int page;
	
	private int pagesize;
	
	private List<T> datas;

	/**
	 * 总记录数
	 * @return
	 */
	public int getTotal() {
		return total;
	}

	public void setTotal(int total) {
		this.total = total;
	}

	/**
	 * 数据
	 * @return
	 */
	public List<T> getDatas() {
		return datas;
	}

	public void setDatas(List<T> datas) {
		this.datas = datas;
	}

	/**
	 * 当前页
	 * @return
	 */
	public int getPage() {
		return page;
	}

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

	/**
	 * 每页显示条数
	 * @return
	 */
	public int getPagesize() {
		return total;
	}

	public void setPagesize(int pagesize) {
		this.pagesize = pagesize;
	}
	
	/**
	 * 总页数
	 * @return
	 */
	public int getTotalPage() {
		return (total + pagesize - 1) / pagesize;
	}

	/**
	 * 下一页
	 * @return
	 */
	public int getNext() {
		int totalPage = getTotalPage();
		return page >= totalPage ? totalPage : page + 1;
	}
	
	/**
	 * 上一页
	 * @return
	 */
	public int getPrev() {
		return page <= 1 ? 1 : page - 1;
	}
	
	/**
	 * 第一页
	 * @return
	 */
	public int getFirst() {
		return 1;
	}
	
	/**
	 * 最后一页
	 * @return
	 */
	public int getLast() {
		return getTotalPage();
	}
	
	/**
	 * 获取当前页之前n页的页码
	 * @param n
	 * @return
	 */
	public int[] getPrevN(int n) {
		int tmp = page - n;
		int start = tmp >= 1 ? tmp : 1;
		int size = page - start;
		int[] prevN = new int[size];
		for(int i = 0; i < size; i ++) {
			prevN[i] = start ++;
		}
		return prevN;
	}
	
	/**
	 * 获取当前页之后n页的页码
	 * @param n
	 * @return
	 */
	public int[] getNextN(int n) {
		int tmp = page + n;
		int totalPage = getTotalPage();
		int end = tmp <= totalPage ? tmp : totalPage;
		int size = end - page;
		int[] nextN = new int[size];
		for(int i = 0; i < size; i ++) {
			nextN[i] = page + i + 1;
		}
		return nextN;
	}
}

测试:

package selfimpr.page;

import junit.framework.TestCase;

/**
 * 测试分页模型
 * @author selfimpr
 * @blog http://blog.csdn.net/lgg201
 * @email [e-mail]
 */
public class TestPageModel extends TestCase {
	public void testPageModel() {
		PageModel<Object> pageModel = new PageModel<Object>();
		pageModel.setTotal(108);
		pageModel.setPage(3);
		pageModel.setPagesize(10);
		
		System.out.println("First page: " + pageModel.getFirst());
		System.out.println("Prev page: " + pageModel.getPrev());
		System.err.println("Current page: " + pageModel.getPage());
		System.out.println("Next page: " + pageModel.getNext());
		System.out.println("Last page: " + pageModel.getLast());
		System.out.println("Total page: " + pageModel.getTotalPage());
		
		System.out.print("Prev 5 pages: ");
		int[] prevN = pageModel.getPrevN(5);
		for(Integer i: prevN) {
			System.out.print("[" + i + "]");
		}
		System.out.println();
		
		System.out.print("Next 5 pages: ");
		int[] nextN = pageModel.getNextN(5);
		for(Integer i: nextN) {
			System.out.print("[" + i + "]");
		}
		System.out.println();
	}
}