pagebean.java

系统特色: 1,栏目无限级分类,形成树型结构

package com.hao2007.struts.bean;

import com.hao2007.struts.form.NewsList;
import java.util.*;

/**
 * Struts分页显示逻辑Bean
 */
public class PageBean {

	int currentPage = 1;// 当前页

	public int totalPages = 0;// 总页数

	int pageRecorders = 10;// 每页10条数据

	int totalRows = 0;// 总数据数

	int pageStartRow = 0;// 每页的起始数

	int pageEndRow = 0;// 每页显示数据的终止数

	boolean hasNextPage = false; // 是否有下一页

	boolean hasPreviousPage = false; // 是否有前一页

	ArrayList arrayList;

	Iterator it;

	public String sort_id;

	 public PageBean() {
	}

	public PageBean(ArrayList arrayList, String pass_sort_id) {
		this.sort_id = pass_sort_id;
		this.arrayList = arrayList;
		totalRows = arrayList.size();
		it = arrayList.iterator();
		hasPreviousPage = false;
		currentPage = 1;
		if ((totalRows % pageRecorders) == 0) {
			totalPages = totalRows / pageRecorders;
		} else {
			totalPages = totalRows / pageRecorders + 1;
		}

		if (currentPage >= totalPages) {
			hasNextPage = false;
		} else {
			hasNextPage = true;
		}

		if (totalRows < pageRecorders) {
			this.pageStartRow = 0;
			this.pageEndRow = totalRows;
		} else {
			this.pageStartRow = 0;
			this.pageEndRow = pageRecorders;
		}

	}

	public String getSort_id() {
		return sort_id;
	}

	public void setSort_id(String sort_id) {
		this.sort_id = sort_id;
	}

	/**
	 * @return Returns the currentPage.
	 */
	public String getCurrentPage() {
		return this.toString(currentPage);
	}

	/**
	 * @param currentPage
	 *            The currentPage to set.
	 */
	public void setCurrentPage(int currentPage) {
		this.currentPage = currentPage;
	}

	/**
	 * @return Returns the pageRecorders.
	 */
	public int getPageRecorders() {
		return pageRecorders;
	}

	/**
	 * @param pageRecorders
	 *            The pageRecorders to set.
	 */
	public void setPageRecorders(int pageRecorders) {
		this.pageRecorders = pageRecorders;
	}

	/**
	 * @return Returns the pageEndRow.
	 */
	public int getPageEndRow() {
		return pageEndRow;
	}

	/**
	 * @return Returns the pageStartRow.
	 */
	public int getPageStartRow() {
		return pageStartRow;
	}

	/**
	 * @return Returns the totalPages.
	 */
	public String getTotalPages() {

		return this.toString(totalPages);
	}

	/**
	 * @return Returns the totalRows.
	 */
	public String getTotalRows() {
		return this.toString(totalRows);
	}

	/**
	 * @return Returns the hasNextPage.
	 */
	public boolean isHasNextPage() {
		return hasNextPage;
	}

	/**
	 * @param hasNextPage
	 *            The hasNextPage to set.
	 */
	public void setHasNextPage(boolean hasNextPage) {
		this.hasNextPage = hasNextPage;
	}

	/**
	 * @return Returns the hasPreviousPage.
	 */
	public boolean isHasPreviousPage() {
		return hasPreviousPage;
	}

	/**
	 * @param hasPreviousPage
	 *            The hasPreviousPage to set.
	 */
	public void setHasPreviousPage(boolean hasPreviousPage) {
		this.hasPreviousPage = hasPreviousPage;
	}

	public NewsList[] getNextPage() {

		currentPage = currentPage + 1;

		if ((currentPage - 1) > 0) {
			hasPreviousPage = true;
		} else {
			hasPreviousPage = false;
		}
		if (currentPage >= totalPages) {
			hasNextPage = false;
		} else {
			hasNextPage = true;
		}

		NewsList[] nsList = getNsList();
		this.description();
		return nsList;
	}

	public NewsList[] getPreviouspage() {
		currentPage = currentPage - 1;

		if (currentPage == 0) {
			currentPage = 1;
		}

		if (currentPage >= totalPages) {
			hasNextPage = false;
		} else {
			hasNextPage = true;
		}
		if ((currentPage - 1) > 0) {
			hasPreviousPage = true;
		} else {
			hasPreviousPage = false;
		}
		NewsList[] nsList = getNsList();
		this.description();
		return nsList;
	}

	public NewsList[] getNsList() {
		System.out.println("pageBean.getBooks（）开始执行；");
		if (currentPage * pageRecorders < totalRows) {// 判断是否为最后一页
			pageEndRow = currentPage * pageRecorders;
			pageStartRow = pageEndRow - pageRecorders;
		} else {
			pageEndRow = totalRows;
			pageStartRow = pageRecorders * (totalPages - 1);
		}
		NewsList[] books = new NewsList[pageEndRow - pageStartRow + 1];

		System.out.println("pageStartRow=" + pageStartRow);
		System.out.println("pageEndRow=" + pageEndRow);
		int j = 0;
		for (int i = pageStartRow; i < pageEndRow; i++) {
			NewsList book = (NewsList) arrayList.get(i);
			books[j++] = book;

		}
		System.out.println("要显示的页面数据已经封装,具体信息如下：");
		this.description();
		return books;
	}

	public String toString(int temp) {
		String str = Integer.toString(temp);
		return str;
	}

	public void description() {
		String description = "共有数据数:" + this.getTotalRows() + "共有页数: "
				+ this.getTotalPages() + "当前页数为:" + this.getCurrentPage()
				+ " 是否有前一页: " + this.isHasPreviousPage() + " 是否有下一页:"
				+ this.isHasNextPage() + " 开始行数:" + this.getPageStartRow()
				+ " 终止行数:" + this.getPageEndRow();
		System.out.println(description);
	}
}