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 map=new HashMap();
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 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。