基于协同过滤算法的景点推荐系统java源码.zip

package jou.cs.service.impl; import jou.cs.configurator.CONST; import jou.cs.entity.TComment; import jou.cs.entity.TUser; import jou.cs.mapper.ComtRepository; import jou.cs.mapper.UserRepository; import jou.cs.service.CommentService; import org.springframework.data.domain.Page; import org.springframework.data.domain.PageRequest; import org.springframework.stereotype.Service; import javax.annotation.Resource; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; @Service public class CommentImpl implements CommentService { @Resource private ComtRepository comtRepository; @Resource private UserRepository userRepository; @Override public void addComment(TComment comment) { comtRepository.save(comment); } @Override public void deleteComment(Long id) { comtRepository.deleteById(id); } @Override public void updateComment(TComment comment) { comtRepository.save(comment); } @Override public TComment getCommentById(Long id) { return comtRepository.findById(id).orElse(null); } @Override public List<Map<Object, Object>> getCommentByPage(int page) { return comtRepository.findAllByTid(CONST.POST, PageRequest.of(page, CONST.PAGE_SIZE)) .stream().collect(ArrayList::new, (list, comt) -> { HashMap<Object, Object> map = new HashMap<>(); map.put("comt", comt); map.put("user", userRepository.findById(comt.getUid()).orElse(null)); list.add(map); }, ArrayList::addAll); } @Override public List<Map<Object,Object>> getCommentByUserId(Long uid) { TUser user = userRepository.findById(uid).orElse(null); return comtRepository.findAllByUid(uid).stream() .collect(ArrayList::new, (list, comt) -> { HashMap<Object, Object> map = new HashMap<>(); map.put("comt", comt); map.put("user", user); list.add(map); }, ArrayList::addAll); } @Override public Page<TComment> getCommentByUserIdAndPage(Long uid, int page) { return comtRepository.findAllByUid(uid, PageRequest.of(page, CONST.PAGE_SIZE)); } @Override public List<Map<String, Object>> getComByPid(Long id) { return comtRepository.findAllByPidAndTid(id, CONST.COMMENT).stream().collect(ArrayList::new, (list, comt) -> { Map<String, Object> map = new HashMap<>(); map.put("comt", comt); map.put("user", userRepository.findById(comt.getUid())); list.add(map); }, ArrayList::addAll); } @Override public List<Object> getPageByPid(Long id, Integer page) { return comtRepository.findAllByPid(id, PageRequest.of(page, CONST.PAGE_SIZE)).getContent() .stream().collect(ArrayList::new, (list, comt) -> { Map<String, Object> map = new HashMap<>(); map.put("comt", comt); map.put("user", userRepository.findById(comt.getUid())); list.add(map); }, ArrayList::addAll); } @Override public Long getMaxId() { return comtRepository.count(); } }