分页测试

第一次做分页，刚刚开始想从网上找一段现成的分页代码拿来直接使用，看了很多头有点晕，但在这种飘飘然的晕中貌似找到点了写分页的灵感，最后决定自己写一段分页代码。


先摆出我写的分页，比较简单较容易懂，后面会上一段标准的分页代码，供参考
原理很简单：用page对象来控制页面信息、改变页面内容
1、Struts 2 下运行
核心方法：根据 LIST<> 中的 subList(startIndex，endIndex);方法

// Page

public class Page {
	private int totalCount;			//总条目
	private int totalPage;			//总页面		
	private int currentCount;		//当前条目
	private int currentPage;		//当前页面

	public Page(){

	}

	public int getTotalCount() {
		return totalCount;
	}
	public void setTotalCount(int totalCount) {
		this.totalCount = totalCount;
	}
	public int getTotalPage() {
		return totalPage;
	}
	public void setTotalPage(int totalPage) {
		this.totalPage = totalPage;
	}
	public int getCurrentCount() {
		return currentCount;
	}
	public void setCurrentCount(int currentCount) {
		this.currentCount = currentCount;
	}
	public int getCurrentPage() {
		return currentPage;
	}
	public void setCurrentPage(int currentPage) {
		this.currentPage = currentPage;
	}

	@Override
	public String toString() {
		// TODO Auto-generated method stub
		return  "totalCount"+totalCount+"\ttotalPage"+totalPage+"\tcurrentCount"+currentCount+"\tcurrentPage"+currentPage;
	}

}

//Action 中代码 在Action中分页
public String execute() throws Exception {
		HttpServletRequest request = ServletActionContext.getRequest();
		HttpSession session = request.getSession();
		ISubjectService subjectSer = new SubjectServiceImpl();
		//得到考卷
		ArrayList arrSubject = subjectSer.querySubject();  //将要分段的内容放置到容器
		//****************************************************
		//分页	
		int showCount = 15;                              //展示页面
		int totalCount = arrSubject.size();              //总条目
		int totalPage = arrSubject.size()/showCount;			 //总页数
		Page page = (Page)session.getAttribute("page");  //得到页面

		if(pageCount<0){
			session.setAttribute("outOfPage", -1); //首页了
			System.out.println("首页了");
			return SUCCESS;			
		}
		if(pageCount>totalPage){
			session.setAttribute("outOfPage", 1);  //尾页了
			System.out.println("尾页了");
			return SUCCESS;			
		}		
		if(page==null){
			page = new Page();	
			page.setCurrentCount(0);
			page.setCurrentPage(0);
			page.setTotalCount(totalCount);				//设置总条目
			page.setTotalPage(totalPage);				//设置总页数
		}
		//page.setTotalCount(totalCount);                 
		//page.setTotalPage(totalPage);					 
		page.setCurrentPage(pageCount);                  //设置当前条目
		int currentPage = page.getCurrentPage();         //当前页面
		int currentCount = page.getCurrentCount();		 //当前条目
		int startCount = currentPage*showCount;
		int endCount = currentPage*showCount + showCount;
		List listSubject = null ;
		if(totalPage==pageCount){
			listSubject = arrSubject.subList(startCount, totalCount);

		}else{
			listSubject = arrSubject.subList(startCount, endCount);
		}	
		session.setAttribute("page", page);          //将页面对象传递到页面
		//****************************************************
		session.setAttribute("arrSubject", listSubject);   //将分页得到的结果放入session
		return super.execute();
	}

										style="color:gray;text-decoration:none " >	上一页
  |
										style="color:gray;text-decoration:none " >	下一页
										 
 当前页面：${session.page.currentPage +1 } /${session.page.totalPage +1 }

2、标准分页 Struts2 + hibernate

//Page
public class Page {
	private int everyPage;			//每页显示记录数
	private int totalCount;			//总记录数
	private int totalPage;			//总页数
	private int currentPage;		//当前页
	private int beginIndex;			//查询起始点
	private boolean hasPrePage;		//是否有上一页
	private boolean hasNextPage;	//是否有下一页
	public Page(int everyPage, int totalCount, int totalPage, 
			int currentPage,int beginIndex, boolean hasPrePage,
			boolean hasNextPage) {	//自定义构造方法
		this.everyPage = everyPage;
		this.totalCount = totalCount;
		this.totalPage = totalPage;
		this.currentPage = currentPage;
		this.beginIndex = beginIndex;
		this.hasPrePage = hasPrePage;
		this.hasNextPage = hasNextPage;
	}
	public Page(){}					//默认构造函数
	public int getEveryPage() {		//获得每页显示记录数
		return everyPage;
	}
	public void setEveryPage(int everyPage) {//设置每页显示记录数
		this.everyPage = everyPage;
	}
	public int getTotalCount() {//获得总记录数
		return totalCount;
	}
	public void setTotalCount(int totalCount) {//设置总记录数
		this.totalCount = totalCount;
	}
	public int getTotalPage() {//获得总页数
		return totalPage;
	}
	public void setTotalPage(int totalPage) {//设置总页数
		this.totalPage = totalPage;
	}
	public int getCurrentPage() {//获得当前页
		return currentPage;
	}
	public void setCurrentPage(int currentPage) {//设置当前页
		this.currentPage = currentPage;
	}
	public int getBeginIndex() {//获得查询起始点
		return beginIndex;
	}
	public void setBeginIndex(int beginIndex) {//设置查询起始点
		this.beginIndex = beginIndex;
	}
	public boolean isHasPrePage() {//获得是否有上一页
		return hasPrePage;
	}
	public void setHasPrePage(boolean hasPrePage) {//设置是否有上一页
		this.hasPrePage = hasPrePage;
	}
	public boolean isHasNextPage() {//获得是否有下一页
		return hasNextPage;
	}
	public void setHasNextPage(boolean hasNextPage) {//设置是否有下一页
		this.hasNextPage = hasNextPage;
	}
}

//页面信息
public class PageResult {
	private Page page;		//分页信息
	private List list;		//记录信息
	public PageResult(Page page, List list) {
		this.page = page;
		this.list = list;
	}
	public Page getPage() {
		return page;
	}
	public void setPage(Page page) {
		this.page = page;
	}
	public List getList() {
		return list;
	}
	public void setList(List list) {
		this.list = list;
	}
}

/*
 * 分页信息辅助类
 */
public class PageUtil {
	public static Page createPage(int everyPage,int totalCount,int currentPage) {//创建分页信息对象
		everyPage = getEveryPage(everyPage);
		currentPage = getCurrentPage(currentPage);
		int totalPage = getTotalPage(everyPage, totalCount);
		int beginIndex = getBeginIndex(everyPage, currentPage);
		boolean hasPrePage = getHasPrePage(currentPage);
		boolean hasNextPage = getHasNextPage(totalPage, currentPage);
		return new Page(everyPage, totalCount, totalPage, currentPage,
				beginIndex, hasPrePage,  hasNextPage);
	}
	public static int getEveryPage(int everyPage) {		//获得每页显示记录数
		return everyPage == 0 ? 10 : everyPage;
	}
	public static int getCurrentPage(int currentPage) {	//获得当前页
		return currentPage == 0 ? 1 : currentPage;
	}
	public static int getTotalPage(int everyPage,int totalCount) {//获得总页数
		int totalPage = 0;
		if(totalCount != 0 &&totalCount % everyPage == 0) {
			totalPage = totalCount / everyPage;
		} else {
			totalPage = totalCount / everyPage + 1;
		}
		return totalPage;
	}
	public static int getBeginIndex(int everyPage,int currentPage) {//获得起始位置
		return (currentPage - 1) * everyPage;
	}
	public static boolean getHasPrePage(int currentPage) {//获得是否有上一页
		return currentPage == 1 ? false : true;
	}
	public static boolean getHasNextPage(int totalPage, int currentPage) {	//获得是否有上一页
		return currentPage == totalPage || totalPage == 0 ? false : true;
	}
}