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系统介绍：（根据协同过滤算法推荐的商品系统）
系统后端设计
协同过滤算法参考
/*** 协同算法（按用户购买推荐）*/@RequestMapping("/autoSort2")public R autoSort2(@RequestParam Map<String, Object> params,ShangpinxinxiEntity shangpinxinxi, HttpServletRequest request){String userId = request.getSession().getAttribute("userId").toString();String goodtypeColumn = "shangpinleixing";List<OrdersEntity> orders = ordersService.selectList(new EntityWrapper<OrdersEntity>().eq("userid", userId).eq("tablename", "shangpinxinxi").orderBy("addtime", false));List<String> goodtypes = new ArrayList<String>();Integer limit = params.get("limit")==null?10:Integer.parseInt(params.get("limit").toString());List<ShangpinxinxiEntity> shangpinxinxiList = new ArrayList<ShangpinxinxiEntity>();//去重List<OrdersEntity> ordersDist = new ArrayList<OrdersEntity>();for(OrdersEntity o1 : orders) {boolean addFlag = true;for(OrdersEntity o2 : ordersDist) {if(o1.getGoodid()==o2.getGoodid() || o1.getGoodtype().equals(o2.getGoodtype())) {addFlag = false;break;}}if(addFlag) ordersDist.add(o1);}if(ordersDist!=null && ordersDist.size()>0) {for(OrdersEntity o : ordersDist) {shangpinxinxiList.addAll(shangpinxinxiService.selectList(new EntityWrapper<ShangpinxinxiEntity>().eq(goodtypeColumn, o.getGoodtype())));}}EntityWrapper<ShangpinxinxiEntity> ew = new EntityWrapper<ShangpinxinxiEntity>();params.put("sort", "id");params.put("order", "desc");PageUtils page = shangpinxinxiService.queryPage(params, MPUtil.sort(MPUtil.between(MPUtil.likeOrEq(ew, shangpinxinxi), params), params));List<ShangpinxinxiEntity> pageList = (List<ShangpinxinxiEntity>)page.getList();if(shangpinxinxiList.size()<limit) {int toAddNum = (limit-shangpinxinxiList.size())<=pageList.size()?(limit-shangpinxinxiList.size()):pageList.size();for(ShangpinxinxiEntity o1 : pageList) {boolean addFlag = true;for(ShangpinxinxiEntity o2 : shangpinxinxiList) {if(o1.getId().intValue()==o2.getId().intValue()) {addFlag = false;break;}}if(addFlag) {shangpinxinxiList.add(o1);if(--toAddNum==0) break;} }} else if(shangpinxinxiList.size()>limit) {shangpinxinxiList = shangpinxinxiList.subList(0, limit);}page.setList(shangpinxinxiList);return R.ok().put("data", page);}
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