spring Pageable分页

 

最近做的项目都用到Pageable分页，感觉挺好用的，就把它记下来，以后去别的地方也会用的着

想用Pageable，要导入jar：spring-data-commons-1.7.0.RELEASE.jar

 

先建个Page的实体类用于后面的操作

public class Pager implements Serializable {
	
	private static final long serialVersionUID = 1236926132859752284L;
	// 倒序还是顺序
	private String order;
	// 排序的字段
	private String sort;
	// 当前页
	private int page = 1;
	// 每页分页的行数
	private int rows = 10;
	private Object[] values;
	// 数据的条数
	private long total;
	// 总页数
	private long allPage;

	public Pager() {
	}

	public Pager(int page, int rows, String sort, String order, Object[] values) {
		this.page = page;
		this.rows = rows;
		this.sort = sort;
		this.order = order;
		this.values = values;

	}

	public Object[] getValues() {
		return values;
	}

	public void setValues(Object[] values) {
		this.values = values;
	}

	public String getOrder() {
		return order;
	}

	public void setOrder(String order) {
		this.order = order;
	}

	public String getSort() {
		return sort;
	}

	public void setSort(String sort) {
		this.sort = sort;
	}

	public int getPage() {
		return page;
	}

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

	public int getRows() {
		return rows;
	}

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

	public long getTotal() {
		return total;
	}

	public void setTotal(long total) {
		this.total = total;
	}

	public long getAllPage() {
		return allPage;
	}

	public void setAllPage() {
		if (total % this.rows == 0) {
			allPage = total / rows;
		} else {
			allPage = total / rows + 1;
		}
	}

	/**
	 * 
	 * 方法描述：获取分页对象 创建人：dujiewei 创建时间：2015-4-15 下午5:07:22
	 */
	public static Pageable getPageable(int page, int rows) {
		Pageable pageable = new PageRequest(page, rows);
		return pageable;
	}

	/**
	 * 
	 * 方法描述：获取分页对象
	 */
	public static Pageable getPageable(Pager pager) {

		int page = pager.getPage();
		int rows = pager.getRows();
		String sort = pager.getSort();
		String order = pager.getOrder();
		Pageable pageable = null;
		if (null == sort || "".equals(sort)) {
			pageable = new PageRequest(page, rows);
		} else {
			pageable = new PageRequest(page, rows,
					Sort.Direction.fromStringOrNull(order), sort);
		}

		return pageable;
	}

	@Override
	public String toString() {
		return "Pager [order=" + order + ", sort=" + sort + ", page=" + page
				+ ", rows=" + rows + ", values=" + Arrays.toString(values)
				+ ", total=" + total + ", allPage=" + allPage + "]";
	}

}

 

上面的代码有一段代码写的是获取分页对象

 */
	public static Pageable getPageable(int page, int rows) {
		Pageable pageable = new PageRequest(page, rows);
		return pageable;
	}

	/**
	 * 
	 * 方法描述：获取分页对象 
	 */
	public static Pageable getPageable(Pager pager) {

		int page = pager.getPage();
		int rows = pager.getRows();
		String sort = pager.getSort();
		String order = pager.getOrder();
		Pageable pageable = null;
		if (null == sort || "".equals(sort)) {
			pageable = new PageRequest(page, rows);
		} else {
			pageable = new PageRequest(page, rows,
					Sort.Direction.fromStringOrNull(order), sort);
		}

		return pageable;
	}

 这段代码才是关键  它是将page对象封装进pageable里面。有了它，我们可以在action或者controller里面写业务逻辑的时候直接使用。demo如下：

比如说我们在用springmvc的时候用到分页

@RequestMapping("/getFinanceLog")
	public ModelAndView getSettleList(Pager page,FinanceLogVO financeLog, HttpServletRequest request,HttpServletResponse response) {
		ModelAndView view=new ModelAndView();
		Map<String, Object> map=new HashMap<String, Object>();
		map.put("ORDER_ID", financeLog.getORDER_ID());  //根据订单编号去查询
		map.put("PAY_TYPE", financeLog.getPAY_TYPE());  //根据支付方式去查询
		map.put("beginDate", request.getParameter("beginDate")); 
		map.put("endDate", request.getParameter("endDate"));   //时间条件查询
		map.put("BUSI_TYPE", financeLog.getBUSI_TYPE());//根据业务类型查询	
		map.put("TRADE_ID",financeLog.getTRADE_ID()); //根据财务流水号查询
		if(StrUtil.isNotNull(request.getParameter("beginDate"))&&StrUtil.isNotNull(request.getParameter("endDate"))){
			map.put("allDate","allDate");//如果前台两个参数都传过来，那么在数据库里面就用 between and来取时间区间
		}
		if(StrUtil.isNotNull(request.getParameter("beginDate"))&&StrUtil.isNull(request.getParameter("endDate"))){
			map.put("startDate","startDate");
		}
		if(StrUtil.isNotNull(request.getParameter("endDate"))&&StrUtil.isNull(request.getParameter("beginDate"))){
			map.put("endsDate","endsDate");
		}
		page.setRows(PAGE_SIZE);  //每页多少数据
		Pageable pageable = Pager.getPageable(page);  //页数封装
		String userId = (String) request.getSession().getAttribute("UID");
		try {
			if (StrUtil.isNotNull(userId)) {
				UserVO user = LoginHelper.getSessionForUser(request); //获取登录角色
		        String userType = user.getUSER_TYPE();    
		        if(userType.equals(Constant.USER_TYPE.SHOP)){         //如果查询出来的用户角色是商家
		            StoreVO store = storeService.selectStoreByUserId(user.getUSER_ID());    //根据登录角色的userId查询商铺
		            map.put("STORE_ID", store.getSTORE_ID());    //如果是商家的话，只查询商家的订单流水
		        }
			Map<String, Object> list=financeLogService.selectLogList(map,pageable);  //查询
			view.addObject("logList", list.get("rows"));
			view.addObject("page_info", list.get("page_info"));
			view.addObject("param", map);
			view.setViewName("zhaiqqadmin/finance/financeLog_list");
		 }else{
			// 跳转到登录页面
			view.setViewName("/zhaiqqadmin/login");
		 }
		} catch (Exception e) {
			logger.error(e);
		}
		return view;
	}
	

 将Pager.getPageable(page)封装进pageable里面，pageable封装的是page对象。里面的各种参数可以自己设定。在查询的时候要将pageable对象传进去。这样就可以分页了。