page.java

本项目源码是一个真实的应用项目

/**
 * 
 */
package org.langsin.computer.util;

import java.util.ArrayList;
import java.util.List;

/**
 *<p>Title: 浪曦视频在线</p>
 * <p>Description: 电脑维修管理系统</p>
 * <p>Copyright: Copyright (c) 2007</p>
 * <p>Company: langsin.com</p>
 * @author [小L]
 * @version 1.0

 */
public class Page {
	private int currentPage = 1; // 当前页

	private int totalPages = 0; // 总页数

	private int pageRecorders = 5; // 每页5行数据

	private int totalRows = 0; // 总数据行数

	private int pageStartRow = 0; // 每页的起始数

	private int pageEndRow = 0; // 每页显示数据的终止数

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

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

	private List list;

	public Page() {
	}

	public Page(List list) {
		this.list = list;

		totalRows = list.size();

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

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

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

	public void 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;
		}
	}

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

	public void setGotoPage(int gotoPage) {
		this.currentPage = gotoPage;
		hasNextPage = true;
		hasPreviousPage = true;
		if (currentPage <= 1) {
			currentPage = 1;
			hasNextPage = true;
			hasPreviousPage = false;
		}
		if (currentPage >= this.totalPages) {
			currentPage = totalPages;
			hasNextPage = false;
			hasPreviousPage = true;
		}
	}

	@SuppressWarnings("unchecked")
	public List getPageList() {
		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);
		}
		List testlist = new ArrayList();
		int j = 0;
		for (int i = pageStartRow; i < pageEndRow; i++) {
			Object obj =  list.get(i);
			testlist.add(j, obj);
			j++;
		}
		return testlist;
	}

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

}