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src/main/java/com/lk/paopao/controller/PostController.java
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60
src/main/java/com/lk/paopao/controller/PostController.java
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package com.lk.paopao.controller;
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import com.lk.paopao.dto.CommentDto;
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import com.lk.paopao.dto.PostDto;
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import com.lk.paopao.dto.rest.request.PostRequest;
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import com.lk.paopao.dto.rest.response.DataResult;
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import com.lk.paopao.dto.rest.response.Paged;
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import com.lk.paopao.dto.rest.response.ResultUtil;
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import com.lk.paopao.service.PostService;
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import jakarta.websocket.server.PathParam;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.web.bind.annotation.*;
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import java.util.ArrayList;
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import java.util.HashMap;
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import java.util.Map;
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@RestController
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@RequestMapping("${app.version}")
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public class PostController {
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@Autowired
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PostService postService;
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// https://iibiubiu.com/v1/posts?style=newest&page=1&page_size=20
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@GetMapping("/posts")
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public DataResult<Paged<PostDto>> getPosts(@PathParam("type") Long type, @PathParam("style") String style, @PathParam("page") Integer page, @PathParam("page_size") Integer pageSize) {
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return ResultUtil.ok(postService.getPosts(type, style, page, pageSize));
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}
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@GetMapping("/post")
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public DataResult<PostDto> getPost(@PathParam("id") Long id) {
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return ResultUtil.ok(postService.getPost(id));
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}
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@PostMapping("/post")
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public DataResult<PostDto> createPost(@RequestBody PostRequest postRequest) {
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return ResultUtil.ok(postService.createPost(postRequest));
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}
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@GetMapping("/post/comments")
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public DataResult<Paged<CommentDto>> getPostComments(@PathParam("id") Long id, @PathParam("style") String style, @PathParam("page") Integer page, @PathParam("page_size") Integer pageSize) {
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Paged<CommentDto> paged = new Paged<>(new ArrayList<>(),0L,1,10);
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return ResultUtil.ok(paged);
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}
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@GetMapping("/post/star")
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public DataResult<Map<String, Boolean>> currentHasStarred(@PathParam("id") Long postId) {
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Map<String, Boolean> result = new HashMap<>();
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result.put("status", postService.currentUserHasStarred(postId));
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return ResultUtil.ok(result);
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}
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@GetMapping("/post/collection")
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public DataResult<Map<String, Boolean>> currentHasCollected(@PathParam("id") Long postId) {
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Map<String, Boolean> result = new HashMap<>();
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result.put("status", postService.currentUserHasCollected(postId));
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return ResultUtil.ok(result);
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}
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}
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package com.lk.paopao.controller;
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import com.lk.paopao.dto.rest.response.DataResult;
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import com.lk.paopao.dto.rest.response.ResultUtil;
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import com.lk.paopao.service.PostService;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.web.bind.annotation.GetMapping;
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import org.springframework.web.bind.annotation.RequestMapping;
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import org.springframework.web.bind.annotation.RequestParam;
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import org.springframework.web.bind.annotation.RestController;
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import java.util.HashMap;
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import java.util.List;
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import java.util.Map;
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@RestController
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@RequestMapping("${app.version}/suggest")
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public class SuggestController {
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@Autowired
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private PostService postService;
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@GetMapping("/users")
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public DataResult<Map<String,List<String>>> suggestUsers(@RequestParam("k") String keyword){
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List<String> names = postService.getSuggestUsers(keyword);
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Map<String,List<String>> res = new HashMap<>();
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res.put("suggest", names);
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return ResultUtil.ok(res);
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}
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@GetMapping("/tags")
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public DataResult<Map<String,List<String>>> suggestTags(@RequestParam("k") String keyword){
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List<String> tags = postService.getSuggestTags(keyword);
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Map<String,List<String>> res = new HashMap<>();
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res.put("suggest", tags);
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return ResultUtil.ok(res);
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}
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}
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@ -3,5 +3,8 @@ package com.lk.paopao.repository;
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import com.lk.paopao.entity.PostCollection;
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import org.springframework.data.jpa.repository.JpaRepository;
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import java.util.Optional;
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public interface PostCollectionRepository extends JpaRepository<PostCollection, Long> {
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Optional<PostCollection> findByUserIdAndPostId(Long userId, Long postId);
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}
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@ -3,5 +3,8 @@ package com.lk.paopao.repository;
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import com.lk.paopao.entity.PostStar;
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import org.springframework.data.jpa.repository.JpaRepository;
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import java.util.Optional;
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public interface PostStarRepository extends JpaRepository<PostStar, Long> {
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Optional<PostStar> findByUserIdAndPostId(Long postId, Long userId);
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}
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@ -10,8 +10,8 @@ import java.util.Optional;
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public interface TagRepository extends JpaRepository<Tag, Long> {
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@Query("SELECT t.tag FROM Tag t WHERE t.tag LIKE CONCAT('%', :key, '%') ORDER BY t.tag ASC limit 20")
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List<String> findByTagContainingOrderByTagAsc(@Param("key") String key);
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@Query("SELECT t.tag FROM Tag t WHERE t.tag LIKE CONCAT('%', :key, '%') ORDER BY t.quoteNum DESC limit 20")
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List<String> findByTagContainingOrderByQuoteNumDesc(@Param("key") String key);
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Optional<Tag> findByTag(String tag);
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208
src/main/java/com/lk/paopao/service/PostService.java
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src/main/java/com/lk/paopao/service/PostService.java
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package com.lk.paopao.service;
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import com.lk.paopao.dto.PostDto;
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import com.lk.paopao.dto.rest.request.PostRequest;
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import com.lk.paopao.dto.rest.response.Paged;
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import com.lk.paopao.entity.Post;
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import com.lk.paopao.entity.PostContent;
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import com.lk.paopao.entity.Tag;
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import com.lk.paopao.entity.User;
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import com.lk.paopao.exception.ResourceNotFoundException;
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import com.lk.paopao.mapper.PostMapper;
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import com.lk.paopao.mapper.TagMapper;
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import com.lk.paopao.repository.*;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.dao.OptimisticLockingFailureException;
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import org.springframework.data.domain.Page;
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import org.springframework.data.domain.PageRequest;
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import org.springframework.data.domain.Pageable;
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import org.springframework.data.domain.Sort;
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import org.springframework.stereotype.Service;
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import org.springframework.transaction.annotation.Transactional;
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import java.util.ArrayList;
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import java.util.List;
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/**
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* 文章服务类，提供文章相关的业务逻辑处理
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*/
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@Service
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@Transactional
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public class PostService {
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// 注入所需的仓库和Mapper类以及其他服务
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@Autowired
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UserRepository userRepository;
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@Autowired
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PostRepository postRepository;
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@Autowired
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TagRepository tagRepository;
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@Autowired
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PostMapper postMapper;
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@Autowired
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TagMapper tagMapper;
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@Autowired
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AuthService authService;
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@Autowired
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PostStarRepository postStarRepository;
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@Autowired
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PostCollectionRepository postCollectionRepository;
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private static final Logger log = LoggerFactory.getLogger(PostService.class);
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/**
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* 根据文章ID获取文章详情
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* @param id 文章ID
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* @return 文章DTO
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*/
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public PostDto getPost(Long id){
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Post post = postRepository.findById(id).orElseThrow(()->new ResourceNotFoundException("Post","id="+id));
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return postMapper.toDto(post);
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}
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/**
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* 获取文章列表
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* @param type 文章类型
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* @param style 文章样式
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* @param page 页码
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* @param size 每页大小
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* @return 文章DTO的分页数据
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*/
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public Paged<PostDto> getPosts(Long type, String style, Integer page, Integer size){
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size = size==null?10:size; // 如果未指定每页大小，默认为10
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Sort sort = Sort.by(Sort.Direction.DESC, "createdOn"); // 按创建时间倒序排序
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Pageable pageable = PageRequest.of(page-1, size, sort); // 创建分页请求
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Page<Post> posts = postRepository.findAll(pageable); // 执行分页查询
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List<PostDto> dtos = new ArrayList<>(); // 用于存储转换后的DTO对象的列表
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posts.getContent().forEach((post)->{
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dtos.add(postMapper.toDto(post)); // 将查询结果转换为DTO
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});
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return new Paged<>(dtos,posts.getTotalElements(),page,posts.getSize()); // 构建并返回分页数据
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}
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/**
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* 创建文章
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* @param postRequest 创建文章的请求参数
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* @return 创建成功后的文章DTO
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*/
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public PostDto createPost(PostRequest postRequest){
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// 获取当前用户
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User user = authService.getCurrentUser();
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Post post = new Post();
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post.setUser(user);
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// 设置附件价格，默认为0
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post.setAttachmentPrice(postRequest.getAttachmentPrice()!=null?postRequest.getAttachmentPrice():0);
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// 设置文章可见性
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post.setVisibility(postRequest.getVisibility());
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// 文章内容
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List<PostContent> contents = new ArrayList<>();
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postRequest.getContents().forEach(contentReq -> {
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PostContent content = new PostContent();
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content.setContent(contentReq.getContent()); // 设置内容
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content.setSort(contentReq.getSort()); // 设置排序
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content.setType(contentReq.getType()); // 设置类型
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content.setPost(post); // 关联文章
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content.setUser(user); // 关联用户
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contents.add(content); // 添加到列表
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});
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post.setContents(contents);
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// 保存文章
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Post savedPost = postRepository.save(post);
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// 处理post中的标签
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handleTags(postRequest, user);
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// 发送消息通知post中@的用户
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handleAtUser(postRequest, user);
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return postMapper.toDto(savedPost);
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}
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private void handleTags(PostRequest postRequest, User currentUser){
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// 处理post中的标签
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postRequest.getTags().forEach((tag)->{
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Tag tagEntity = tagRepository.findByTag(tag).orElse(null);
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if(tagEntity==null){
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// 如果标签不存在，则创建新标签并关联文章
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tagEntity = new Tag();
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tagEntity.setTag(tag);
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tagEntity.setUser(currentUser);
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tagEntity.setQuoteNum(1L);
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tagRepository.save(tagEntity);
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}else{
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// 如果标签已存在，则更新引用次数
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try {
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tagEntity.setQuoteNum(tagEntity.getQuoteNum() + 1L);
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tagRepository.save(tagEntity); // Spring Data JPA 自动处理乐观锁
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} catch (OptimisticLockingFailureException e) {
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// 处理乐观锁失败的情况，如重新获取实体并重试或记录日志等
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log.error("Optimistic locking failed for tag: {}", tagEntity.getTag(), e);
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// TODO： 可添加重试逻辑
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// 简单处理为继续抛出异常，让此次发帖失败
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throw e;
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}
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}
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});
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}
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private void handleAtUser(PostRequest postRequest, User currentUser){
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postRequest.getUsers().forEach((username)->{
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User toUser = userRepository.findByUsername(username).orElseThrow(()->new ResourceNotFoundException("User","username="+username));
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// TODO: 发送消息通知toUser
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});
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}
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/**
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* 获取用户推荐列表
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* @param keyword 关键字，用于筛选推荐用户
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* @return 符合条件的用户列表
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*/
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public List<String> getSuggestUsers(String keyword){
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// 如果关键字为空，则默认为空字符串
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keyword = keyword==null?"":keyword;
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// 根据关键字查询并按用户名升序返回用户列表
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return userRepository.findByUsernameContainingOrderByUsernameAsc(keyword);
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}
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/**
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* 获取标签推荐列表
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* @param keyword 关键字，用于筛选推荐标签
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* @return 符合条件的标签列表
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*/
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public List<String> getSuggestTags(String keyword){
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keyword = keyword==null?"":keyword;
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// 根据关键字查询并按标签名升序返回标签列表
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return tagRepository.findByTagContainingOrderByQuoteNumDesc(keyword);
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}
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/**
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* 封装帖子的分页数据。
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*
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* @param posts 分页的帖子数据。
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* @return 返回封装好的帖子分页数据。
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*/
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private Paged<PostDto> pageDataWrapper(Page<Post> posts){
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// 将帖子实体转换为DTO
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List<PostDto> dtos = new ArrayList<>();
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posts.getContent().forEach((post)->{
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dtos.add(postMapper.toDto(post));
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});
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// 返回封装好的分页数据
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return new Paged<>(dtos,posts.getTotalElements(),posts.getNumber()+1,posts.getSize());
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}
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public boolean currentUserHasStarred(Long postId){
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User user = authService.getCurrentUser();
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return postStarRepository.findByUserIdAndPostId(user.getId(), postId).isPresent();
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}
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public boolean currentUserHasCollected(Long postId){
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User user = authService.getCurrentUser();
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return postCollectionRepository.findByUserIdAndPostId(user.getId(), postId).isPresent();
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}
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}
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