pagebean.java

java源代码

package com.soft136.struts.model;

import java.util.ArrayList;
import java.util.Iterator;

public class PageBean {

	int currentPage = 1;// 当前页
	public int totalPages; // 总页数
	int pageRecorders = 1;// 每页5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<PersonBean> arrayList;
	Iterator<PersonBean> it;

	public PageBean() {

	}

	public ArrayList<PersonBean> getArrayList() {
		return arrayList;
	}

	public void setArrayList(ArrayList<PersonBean> arrayList) {
		this.arrayList = arrayList;
	}

	public PageBean(ArrayList<PersonBean> list) {
		this.arrayList = list;
		totalRows = list.size();

		// it = list.iterator();
		hasPreviousPage = false;
		/*
		 * 判断总共有多少页
		 */
		if (totalRows == 0) {
			totalPages = 1;
		} else if ((totalRows % pageRecorders) == 0) {
			totalPages = totalRows / pageRecorders;
		} else {
			totalPages = totalRows / pageRecorders + 1;
		}

		/*
		 * 判断是否有下一页
		 */

		if (currentPage >= totalPages) {
			hasNextPage = false;
		} else {
			hasNextPage = true;
		}
		/*
		 * 判断每页的起始页和终止页
		 */

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

	public int getCurrentPage() {
		return currentPage;
	}

	public void setCurrentPage(int currentPage) {
		this.currentPage = currentPage;
	}

	public int getPageRecorders() {
		return pageRecorders;
	}

	public void setPageRecorders(int pageRecorders) {
		this.pageRecorders = pageRecorders;
	}

	public int getPageEndRow() {
		return pageEndRow;
	}

	public int getPageStartRow() {
		return pageStartRow;
	}

	public String getTotalPages() {

		return String.valueOf(totalPages);
	}

	public String getTotalRows() {
		return String.valueOf(totalRows);
	}

	public boolean isHasNextPage() {
		return hasNextPage;
	}

	public void setHasNextPage(boolean hasNextPage) {
		this.hasNextPage = hasNextPage;
	}

	public boolean isHasPreviousPage() {
		return hasPreviousPage;
	}

	public void setHasPreviousPage(boolean hasPreviousPage) {
		this.hasPreviousPage = hasPreviousPage;
	}

	public PersonBean[] getPersonBean() {
		// System.out.println("pageBean.getBooks（）开始执行；");
		// System.out.println(currentPage);
		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);
		}
		PersonBean[] books = new PersonBean[pageEndRow - pageStartRow + 1];

		// System.out.println("pageStartRow=" + pageStartRow);
		// System.out.println("pageEndRow=" + pageEndRow);
		int j = 0;
		for (int i = pageStartRow; i < pageEndRow; i++) {

			PersonBean book = (PersonBean) 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 PersonBean[] getnextPage() {
		currentPage = currentPage + 1;
		/*
		 * 判断是否有上一页
		 */
		if ((currentPage - 1) > 0) {
			hasPreviousPage = true;
		} else {
			hasPreviousPage = false;
		}
		/*
		 * 判断是否有下一页
		 */
		if (currentPage >= totalPages) {
			hasNextPage = false;
		} else {
			hasNextPage = true;
		}
		PersonBean[] books = getPersonBean();
		// this.description();
		return books;
	}

	public PersonBean[] 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;
		}
		PersonBean[] books = getPersonBean();
		// this.description();
		return books;
	}

	// 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);
	//	}
}