pageinfo.java

一个汽车售后服务站的典型的进销管理系统,B/S模式的

package com.xfaccp.base;

public class PageInfo {
	
	    private int totalRows = 0; // 记录总数
	    
	    private int pageSize = 3; // 每页显示数据条数，默认为3条记录

	    private int totalPages = 0; // 总页数

	    private int currentPage = 1; // 当前页数(初始显示为第一页)

	    private boolean hasPrevious = false; // 是否有上一页

	    private boolean hasNext = false; // 是否有下一页
	    
	    public PageInfo() {

	    }
	    
	    
		 // 自定义方法用于刷新当前页面信息
		    public void refresh() {
		    	//只有一页信息case
		        if (totalPages <1) {
		            hasPrevious = false;
		            hasNext = false;
		        }
		        //不止一页但当前为第一页的case
		        else if (currentPage == 1) {
		            hasPrevious = false;
		            hasNext = true;
		        }
		        //不止一页而且当前页为最后一页
		        else if (currentPage == totalPages) {
		            hasPrevious = true;
		            hasNext = false;
		        }
		        //不止一页当前页为中间页
		        else {
		            hasPrevious = true;
		            hasNext = true;
		        }

		    }

	    public void init(int totalRows, int pageSize) {

	        this.totalRows = totalRows;

	        this.pageSize = pageSize;

	        totalPages = ((totalRows + pageSize) - 1) / pageSize;
	        //刷新当前页面信息
	        refresh(); 

	    }

	    public int getCurrentPage() {
	        return currentPage;

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

	    }
	    public int getPageSize() {
	        return pageSize;

	    }
	    public void setPageSize(int pageSize) {
	        this.pageSize = pageSize;
	        refresh();

	    }

	    public int getTotalPages() {
	        return totalPages;

	    }
	    public void setTotalPages(int totalPages) {
	        this.totalPages = totalPages;
	        refresh();

	    }
	    public int getTotalRows() {
	        return totalRows;

	    }

	    public void setTotalRows(int totalRows) {

	        this.totalRows = totalRows;
	        refresh();

	    }
	    
	// 跳到第一页
	    public void first() {
	    	
	        currentPage = 1;
	        this.setHasPrevious(false);
	        refresh();

	    }
	// 取得上一页（重新设定当前页面即可）

	    public void previous() {
	    	if(currentPage>0)
	    	{
	        currentPage--;
	    	}
	        refresh();
	    }

	// 取得下一页
	    public void next() {
	        System.out.println("next: totalPages: " + totalPages +" currentPage : " + currentPage);
	        if (currentPage < totalPages) {
	            currentPage++;
	        }
	        refresh();
	    }

	 // 跳到最后一页
	    public void last() {
	        currentPage = totalPages;
	        this.setHasNext(false);
	        refresh();

	    }
	    public boolean isHasNext() {
	        return hasNext;

	    }
	    public void setHasNext(boolean hasNext) {
	        this.hasNext = hasNext;

	    }
	    public boolean isHasPrevious() {
	        return hasPrevious;

	    }
	    public void setHasPrevious(boolean hasPrevious) {
	        this.hasPrevious = hasPrevious;

	    }
	 

}