分页封装VO

àì夳堔傛蜴生んèń 2021-06-24 14:36 524阅读 0赞

/**
     * 
     */
    /** 
     * @ClassName: PageInfo 
     * @Description: TODO(这里用一句话描述这个类的作用) 
     * @author zhoushun
     * @date 2012-3-11 下午12:45:13 
     *  
     */
    /**
     * 该类描述了分页记录集中的关于页的信息
     */
    public class PageInfo {
    	/**
    	 * 总共记录数
    	 */
    	private int totalRow;	//
    	/**
    	 * 总共页数
    	 */
    	private int totalPage;	//
    	/**
    	 * 当前页，默认为1
    	 */
    	private int currentPage = 1; //
    	/**
    	 * 页的大小(默认显示10条)
    	 */
    	private int pageSize = 10;   //
    	/**
    	 * 当前页的第一条记录的编号
    	 */
    	private int startRow=2;
    	private boolean hasPrevious;
    	private boolean hasNext;
    	private boolean bof;
    	private boolean eof;
        /** 构造方法
    	   @param totalRow 总记录数
    	   @param pageSize 页的大小
    	   @param page 页码
         */
    	public PageInfo(int totalRow, int pageSize, int page) {
    		this.totalRow = totalRow;
    		this.pageSize = pageSize;
    		// 根据页大小和总记录数计算出总页数
    		this.totalPage = countTotalPage(this.pageSize, this.totalRow);
    		setCurrentPage(page);
    		//获取当前页的第一条记录的编号
    		this.startRow=getStartRow(this.pageSize, this.currentPage);
    		//System.out.println("startRow:"+startRow);
    		// 修正当前页
    		
    		init();
    	}
    	/**
    	 * 获取当前页的第一条记录的编号
    	 * @param pageSize(页的大小)
    	 * @param page（页码）
    	 * @return
    	 */
    	public int getStartRow(int pageSize, int page){
    		
    		return pageSize*(page-1)+1;
    	}
    	
    	public int getTotalRow() {
    		return totalRow;
    	}
    
    	
    	public int getStartRow() {
    		return startRow;
    	}
    	public void setStartRow(int startRow) {
    		this.startRow = startRow;
    	}
    
    	public void setTotalRow(int totalRow) {
    		this.totalRow = totalRow;
    	}
    
    
    	public void setTotalPage(int totalPage) {
    		this.totalPage = totalPage;
    	}
    
    
    	public void setHasPrevious(boolean hasPrevious) {
    		this.hasPrevious = hasPrevious;
    	}
    
    
    	public void setHasNext(boolean hasNext) {
    		this.hasNext = hasNext;
    	}
    
    
    	public void setBof(boolean bof) {
    		this.bof = bof;
    	}
    
    
    	public void setEof(boolean eof) {
    		this.eof = eof;
    	}
    
    
    	public int getTotalPage() {
    		return totalPage;
    	}
    	public int getCurrentPage() {
    
    		return this.currentPage;
    	}
    	// 修正计算当前页
    	public void setCurrentPage(int currentPage) {
            if(currentPage>this.totalPage){
            	this.currentPage=this.totalPage;        	
            }else if (currentPage<1){
            	this.currentPage=1;
            }
            else{
            	this.currentPage=currentPage;
            }
    	}
    	// 获取分页大小
    
    	public int getPageSize() {
    		return pageSize;
    	}
    
    	// 设置分页大小
    	public void setPageSize(int pageSize) {
    		this.pageSize = pageSize;
    	}
    	// 获取当前页记录的开始索引
    	public int getBeginIndex() {
    		int beginIndex = (currentPage - 1) * pageSize; // 索引下标从0开始
            if(beginIndex < 0){
                return 0;
            }
    		return beginIndex;
    	}
    	/**
    	 *  计算总页数
    	 * @param pageSize
    	 * @param totalRow
    	 * @return
    	 */
    	public int countTotalPage(int pageSize, int totalRow) {
    		int totalPage = totalRow%pageSize == 0 ? (totalRow/pageSize):(totalRow/pageSize)+1;
    		return totalPage;
    	}
    	/**
    	 *  返回下一页的页码
    	 * @return
    	 */
    	public int getNextPage() {
    
    		if (currentPage + 1 >= this.totalPage) { // 如果当前页已经是最后页 则返回最大页
    			return this.totalPage;
    		}
    		return currentPage + 1; 
    	}
    	// 返回前一页的页码
    
    	public int getPreviousPage() {
    		if (currentPage - 1 <= 1) {
    
    			return 1;
    
    		} else {
    			return currentPage - 1;
    		}
    
    	}
    	public boolean isHasPrevious() {
    		return hasPrevious;
    	}
    	public boolean isHasNext() {
    		return hasNext;
    	}
    	public boolean isBof() {
    		return bof;
    
    	}
    	public boolean isEof() {
    
    		return eof;
    
    	}
    	public boolean hasNext() {
    
    		return currentPage < this.totalPage;
    
    	}
    	public boolean hasPrevious() {
    
    		return currentPage > 1;
    
    	}
    	public boolean isFirst() {
    
    		return currentPage == 1;
    
    	}
    	public boolean isLast() {
    
    		return currentPage >= this.totalPage;
    
    	}
    	// 初始化信息
    
    	private void init() {
    
    		this.hasNext = hasNext();
    
    		this.hasPrevious = hasPrevious();
    
    		this.bof = isFirst();
    
    		this.eof = isLast();
    
    	}
    }

//使用：

PageInfo pageInfo = new PageInfo(count, max, page);

总数、每页最大页数、当前第几页