SSH 分页查询

前台请求json数据时

pageBean工具类

public class PageBean {
	//当前页
	private int currentPage;
	//每页显示条数
	private int pageSize;
	//查询条件
	private DetachedCriteria detachedCriteria;
	//总条数
	private int total;
	//查询结果集合
	private List rows;
	public int getCurrentPage() {
		return currentPage;
	}
	public void setCurrentPage(int currentPage) {
		this.currentPage = currentPage;
	}
	public int getPageSize() {
		return pageSize;
	}
	public void setPageSize(int pageSize) {
		this.pageSize = pageSize;
	}
	public DetachedCriteria getDetachedCriteria() {
		return detachedCriteria;
	}
	public void setDetachedCriteria(DetachedCriteria detachedCriteria) {
		this.detachedCriteria = detachedCriteria;
	}
	public int getTotal() {
		return total;
	}
	public void setTotal(int total) {
		this.total = total;
	}
	public List getRows() {
		return rows;
	}
	public void setRows(List rows) {
		this.rows = rows;
	}
	
}

Action

    private int page;
	private int rows;
	
	

	public void setPage(int page) {
		this.page = page;
	}

	public void setRows(int rows) {
		this.rows = rows;
	}


    public String pageQuery() throws IOException{
		PageBean pageBean = new PageBean();
		pageBean.setCurrentPage(page);
		pageBean.setPageSize(rows);
		//离线查询对象
		DetachedCriteria detachedCriteria = DetachedCriteria.forClass(Staff.class);
		pageBean.setDetachedCriteria(detachedCriteria);
		staffService.pageQuery(pageBean);
		
		JsonConfig jsonConfig = new JsonConfig();
		jsonConfig.setExcludes(new String[]{"currentPage","detachedCriteria","pageSize"});
		String json = JSONObject.fromObject(pageBean, jsonConfig).toString();
                //返回json
		ServletActionContext.getResponse().setContentType("text/json;charset=utf-8");
		ServletActionContext.getResponse().getWriter().write(json);
		return NONE;
	}

service直接调用dao

dao：

    public void pageQuery(PageBean pageBean) {
		int currentPage = pageBean.getCurrentPage();
		int pageSize = pageBean.getPageSize();
		DetachedCriteria detachedCriteria = pageBean.getDetachedCriteria();
		
		//查询total---总数据量
		detachedCriteria.setProjection(Projections.rowCount());//指定hibernate框架sql的形式----》select count(*) from bc_staff;
		List<Long> countList = (List<Long>) this.getHibernateTemplate().findByCriteria(detachedCriteria);
		Long count = countList.get(0);
		pageBean.setTotal(count.intValue());
		
		//查询rows---当前页需要展示的数据集合
		detachedCriteria.setProjection(null);//指定hibernate框架发出sql的形式----》select * from bc_staff;
		int firstResult = (currentPage - 1) * pageSize;
		int maxResults = pageSize;
		List rows = this.getHibernateTemplate().findByCriteria(detachedCriteria, firstResult, maxResults);
		pageBean.setRows(rows);
	}