pageseparator.java

使用JSP+Servlet+Hibernate+Struts实现的一个学生软件发布平台

package edu.neu.sspp;


public class PageSeparator {
	private int count;
	private int totalPage;
	private int size;
	private int currentPage;
	private boolean isEnd;
	private boolean isBegin;
	
	public PageSeparator(int count, int size) {
		this.count = count;
		this.size = size;
		
		init();
	
	}
	
	private void init() {
		if(count % size != 0)
			totalPage = count / size + 1;
		else
			totalPage = count / size;
		
		currentPage = 1;
		refresh();
	}
	
	private void refresh() {
		if(totalPage == 1) {
			isBegin = true;
			isEnd = true;
		}
		else if(currentPage == 1) {
			isBegin = true;
			isEnd = false;
		}
		else if(currentPage == totalPage) {
			isBegin = false;
			isEnd = true;
		}
		else {
			isBegin = false;
			isEnd = false;
		}		
	}
	
	public void setCurrentPage(int currentPage) throws Exception {
		if(currentPage > totalPage || currentPage < 1)
			throw new Exception("current page error!");
		else
			this.currentPage = currentPage;
		refresh();
	}
	
	public int getCurrentPage() {
		return currentPage;
	}
	
	public int getTotalPage() {
		return totalPage;
	}
	
	public boolean getIsBegin() {
		return isBegin;
	}
	
	public boolean getIsEnd() {
		return isEnd;
	}
	
	public void setToBegin() {
		currentPage = 1;
		refresh();
	}
	
	public void setToEnd() {
		currentPage = totalPage;
		refresh();
	}
	
	public int getSize() {
		return size;
	}
	
	public int getCurrentPageBegin() {
		return (currentPage - 1) * size;
	}
	
	public int getCurrentPageEnd() {
		if(!isEnd || count % size == 0)
			return currentPage * size;
		else
			return (currentPage - 1) * size + count % size;
	}
	
	public int getCurrentPageCount() {
		if(!isEnd || count % size == 0)
			return size;
		else
			return count % size;
	}
	
	public int getNextPage() {
		return currentPage + 1;
	}
	
	public int getBackPage() {
		return currentPage - 1;
	}
	
	public int getCount() {
		return count;
	}
}