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DiscussPost selectDiscussPostById(int id);

discusspost-mapper.xml

    select     from discuss_post    where id = #{
   id}

DiscussPostService

public DiscussPost findDiscussPostById(int id) {
       return discussPostMapper.selectDiscussPostById(id);}

DiscussPostController

@RequestMapping(path = "/detail/{discussPostId}", method = RequestMethod.GET)public String getDiscussPost(@PathVariable("discussPostId") int discussPostId, Model model) {
       // 帖子    DiscussPost post = discussPostService.findDiscussPostById(discussPostId);    model.addAttribute("post", post);    // 作者    User user = userService.findUserById(post.getUserId());    model.addAttribute("user", user);    return "/site/discuss-detail";}

index.html，改超链接。| |是常量和变量拼接的。取帖子主键用${map.post.id}

th:href="@{|/discuss/detail/${map.post.id}|}"

discuss-detail.html，改动态标题、头像、用户名、发帖时间、帖子内容

th:utext="${post.title}"th:src="${user.headerUrl}"th:utext="${user.username}"th:text="${#dates.format(post.createTime,'yyyy-MM-dd HH:mm:ss')}"th:utext="${post.content}"

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