java8 Lambad表达式自己的例子

 service层方法

 public <E> E outer(Function<Session, E> function) {

 return dao.outer(function);
 }

 dao层方法

 public <E> E outer(Function<Session, E> function) {

 return function.apply(this.sessionFactory.getCurrentSession());
 }

 controller层查询方法

 @RequestMapping(value = "/findEntityJson/{pageNum}")
 public @ResponseBody Object findEntityJson(
 　　   @PathVariable(value = "pageNum") Integer pageNum){
 final int pageSize = 5;
 return baseService.outer((session) -> {
 JSONObject json = new JSONObject();
 StringBuffer hql = new StringBuffer();//hql语句
 hql.append("from Entity where 1=1 ");
 Query dataQuery = session.createQuery(hql.toString());
 // 分页
 dataQuery.setFirstResult((pageNum - 1) * pageSize).setMaxResults(pageSize);
 json.put("data", Arrays.stream(dataQuery.list().toArray()).map(Entity.class::cast).collect(Collectors.toList()));
 // 列表数量查询
 String hql_1 = "select count(*) " + hql.toString();
 Query sizeQuery = session.createQuery(hql_1);
 json.put("size", sizeQuery.uniqueResult());
 return json;
 });
 }