pagebean.java

struts spring+Hibernate 实现文件上传下载操作

package sshfile.help;

import java.util.ArrayList;
import java.util.Iterator;
import sshfile.model.*;
public class PageBean {

	int currentPage = 1; // 当前页

	public int totalPages = 0; // 总页数

	int pageRecorders = 10;// 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 arrayList;

	Iterator it;

	public PageBean() {
	}

	public PageBean(ArrayList arrayList) {
		this.arrayList = arrayList;
		totalRows = arrayList.size();
		// System.out.print(totalRows);
		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;
		}

	}

	/**
	 * @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 Tfile[] getNextPage() {

		currentPage = currentPage + 1;
		// System.out.println("PageBean.getNextPage()正在执行；");
		// System.out.println("参数currentPage="+currentPage);

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

		if (currentPage >= totalPages) {
			hasNextPage = false;
		} else {
			hasNextPage = true;
		}
		// System.out.println("参数hasNextPage="+hasNextPage);
		// System.out.println("准备执行PageBean.getBooks()");
		Tfile[] products = getServiceInfo();
		this.description();

		return products;
	}

	public Tfile[] 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;
		}
		Tfile[] products = getServiceInfo();
		this.description();
		return products;
	}

	public Tfile[] getFirstpage() {

		currentPage = 1;

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

	public Tfile[] getLastpage() {

		currentPage = totalPages;

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

	public Tfile[] getServiceInfo() {
		// System.out.println("pageBean.getPros（）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);
		}
		Tfile[] products = new Tfile[pageEndRow
				- pageStartRow + 1];

		// System.out.println("pageStartRow="+pageStartRow);
		// System.out.println("pageEndRow="+pageEndRow);
		int j = 0;
		for (int i = pageStartRow; i < pageEndRow; i++) {
            
			Tfile product = (Tfile) arrayList.get(i);
			products[j++] = product;

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

	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);

	}
}