{"id":201625,"date":"2025-05-10T11:25:20","date_gmt":"2025-05-10T03:25:20","guid":{"rendered":"https:\/\/server.hk\/cnblog\/201625\/"},"modified":"2025-05-10T11:25:20","modified_gmt":"2025-05-10T03:25:20","slug":"redis%e7%ac%94%e8%ae%b0%e7%82%b9%e8%b5%9e%e6%8e%92%e8%a1%8c%e6%a6%9c%e7%9a%84%e5%ae%9e%e7%8e%b0%e7%a4%ba%e4%be%8b","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/201625\/","title":{"rendered":"Redis\u7b14\u8bb0\u70b9\u8d5e\u6392\u884c\u699c\u7684\u5b9e\u73b0\u793a\u4f8b"},"content":{"rendered":"

<\/b> <\/p>\n

Redis\u7b14\u8bb0\u70b9\u8d5e\u6392\u884c\u699c\u7684\u5b9e\u73b0\u793a\u4f8b<\/h1>\n

<\/i>\u6536\u85cf<\/span> <\/p>\n

\u4ece\u73b0\u5728\u5f00\u59cb\uff0c\u6211\u4eec\u8981\u52aa\u529b\u5b66\u4e60\u5566\uff01\u4eca\u5929\u6211\u7ed9\u5927\u5bb6\u5e26\u6765\u300aRedis\u7b14\u8bb0\u70b9\u8d5e\u6392\u884c\u699c\u7684\u5b9e\u73b0\u793a\u4f8b\u300b<\/span>\uff0c\u611f\u5174\u8da3\u7684\u670b\u53cb\u8bf7\u7ee7\u7eed\u770b\u4e0b\u53bb\u5427\uff01\u4e0b\u6587\u4e2d\u7684\u5185\u5bb9\u6211\u4eec\u4e3b\u8981\u4f1a\u6d89\u53ca\u5230\u70b9\u8d5e\u3001Redis\u7b14\u8bb0<\/span>\u7b49\u7b49\u77e5\u8bc6\u70b9\uff0c\u5982\u679c\u5728\u9605\u8bfb\u672c\u6587\u8fc7\u7a0b\u4e2d\u6709\u9047\u5230\u4e0d\u6e05\u695a\u7684\u5730\u65b9\uff0c\u6b22\u8fce\u7559\u8a00\u5440\uff01\u6211\u4eec\u4e00\u8d77\u8ba8\u8bba\uff0c\u4e00\u8d77\u5b66\u4e60\uff01<\/p>\n

\u4e00\u3001\u53d1\u5e03\u63a2\u5e97\u7b14\u8bb0<\/h2>\n

\u63a2\u5e97\u7b14\u8bb0\u7c7b\u4f3c\u70b9\u8bc4\u7f51\u7ad9\u7684\u8bc4\u4ef7\uff0c\u5f80\u5f80\u662f\u56fe\u6587\u7ed3\u5408\u3002\u5bf9\u5e94\u7684\u8868\u6709\u4e24\u4e2a<\/p>\n

    \n
  • \u63a2\u5e97\u7b14\u8bb0\u8868\uff08\u4e3b\u952e\u3001\u5546\u6237id\u3001\u7528\u6237id\u3001\u6807\u9898\u3001\u6587\u5b57\u3001\u56fe\u7247\u3001\u63a2\u5e97\u6587\u5b57\u63cf\u8ff0\u3001\u70b9\u8d5e\u6570\u91cf\u3001\u8bc4\u8bba\u6570\u91cf\uff09<\/li>\n
  • \u8bc4\u4ef7\u8868\uff08\u7b14\u8bb0\u7684\u8bc4\u4ef7\uff09<\/li>\n<\/ul>\n

     \u5148\u4e0a\u4f20\u56fe\u7247\u8bf7\u6c42\u4e00\u6b21\u4fdd\u5b58\u56fe\u7247\u63a5\u53e3\uff0c\u518d\u70b9\u53d1\u5e03\u8bf7\u6c42\u53d1\u5e03\u63a5\u53e3\u3002\u8fd9\u4e24\u4e2a\u63a5\u53e3\u5df2\u7ecf\u5199\u597d<\/p>\n

    <\/p>\n

    \u4e8c\u3001\u5b9e\u73b0\u67e5\u770b\u7b14\u8bb0\u63a5\u53e3<\/h2>\n

    <\/p>\n

    BlogController<\/p>\n

    @RestController\n@RequestMapping(\"\/blog\")\npublic class BlogController {\n \n    @Resource\n    private IBlogService blogService;\n   \n    @GetMapping(\"\/hot\")\n    public Result queryHotBlog(@RequestParam(value = \"current\", defaultValue = \"1\") Integer current) {\n \n        return blogService.queryHotBlog(current);\n    }\n \n    @GetMapping(\"\/{id}\")\n    public Result queryBlogById(@PathVariable(\"id\") String id){\n        return blogService.queryBlogById(id);\n    }\n}<\/pre>\n
    IBlogService<\/p>\n
    public interface IBlogService extends IService\n   \n     {\n \n    Result queryBlogById(String id);\n \n    Result queryHotBlog(Integer current);\n}\n   <\/pre>\n
    BlogServiceImpl<\/p>\n
    @Service\npublic class BlogServiceImpl extends ServiceImpl\n   \n     implements IBlogService {\n \n    @Autowired\n    private IUserService userService;\n \n    @Override\n    public Result queryHotBlog(Integer current) {\n        \/\/ \u6839\u636e\u7528\u6237\u67e5\u8be2\n        Page\n    \n      page = query() .orderByDesc(\"liked\") .page(new Page(current, SystemConstants.MAX_PAGE_SIZE)); \/\/ \u83b7\u53d6\u5f53\u524d\u9875\u6570\u636e List\n     \n       records = page.getRecords(); \/\/ \u67e5\u8be2\u7528\u6237 records.forEach(this::queryBlogUser); return Result.ok(records); } private void queryBlogUser(Blog blog) { Long userId = blog.getUserId(); User user = userService.getById(userId); blog.setName(user.getNickName()); blog.setIcon(user.getIcon()); } @Override public Result queryBlogById(String id) { Blog blog = getById(id); if(blog == null){ return Result.fail(\"\u7b14\u8bb0\u4e0d\u5b58\u5728\uff01\"); } queryBlogUser(blog); return Result.ok(blog); } }\n     \n    \n   <\/pre>\n
    \u4e09\u3001\u70b9\u8d5e\u529f\u80fd<\/h2>\n
    \u73b0\u5728\u5df2\u7ecf\u5199\u597d\u7684\u70b9\u8d5e\u63a5\u53e3<\/p>\n
    <\/p>\n
    \u95ee\u9898\uff1a\u8fd9\u6837\u5199\u63a5\u53e3\uff0c\u53ef\u4ee5\u4e00\u76f4\u6309\u70b9\u8d5e\u91cd\u590d\u70b9\u8d5e<\/p>\n
    \u9700\u6c42<\/strong><\/p>\n
      \n
    • \u540c\u4e00\u4e2a\u7528\u6237\u53ea\u80fd\u70b9\u8d5e\u4e00\u6b21\uff0c\u518d\u6b21\u70b9\u8d5e\u5219\u53d6\u6d88\u70b9\u8d5e<\/li>\n
    • \u5982\u679c\u5f53\u524d\u7528\u6237\u5df2\u7ecf\u70b9\u8d5e\uff0c\u5219\u70b9\u8d5e\u6309\u94ae\u9ad8\u4eae\u663e\uff08\u524d\u7aef\u5df2\u7ecf\u5b9e\u73b0\uff0c\u5224\u65adblog\u7c7b\u7684isLike\u5c5e\u6027\uff09<\/li>\n<\/ul>\n
      \u5b9e\u73b0\u6b65\u9aa4<\/strong><\/p>\n
        \n
      • \u7ed9Blog\u7c7b\u4e2d\u6dfb\u52a0\u4e00\u4e2aisLike\u5b57\u6bb5\uff0c\u8868\u793a\u662f\u5426\u88ab\u5f53\u524d\u7528\u6237\u70b9\u8d5e<\/li>\n
      • \u4fee\u6539\u70b9\u8d5e\u529f\u80fd\uff0c\u5229\u7528redis\u7684set\u96c6\u5408\u5224\u65ad\u7528\u6237\u662f\u5426\u8d5e\u8fc7\uff0c\u672a\u8d5e\u5219\u70b9\u8d5e\u6570+1\uff0c\u8d5e\u8fc7\u5219-1<\/li>\n
      • \u4fee\u6539\u6839\u636eid\u67e5\u8be2blog\u7684\u4e1a\u52a1\uff0c\u5224\u65ad\u5f53\u524d\u7528\u6237\u662f\u5426\u70b9\u8d5e\u8fc7\uff0c\u8d4b\u503c\u7ed9isLike\u5b57\u6bb5<\/li>\n
      • \u4fee\u6539\u5206\u9875\u67e5\u8be2blog\u4e1a\u52a1\uff0c\u5224\u65ad\u5f53\u524d\u7528\u6237\u662f\u5426\u8d5e\u8fc7\uff0c\u8d4b\u503cisLike\u5b57\u6bb5<\/li>\n<\/ul>\n
        \u4e1a\u52a1\u5b9e\u73b0<\/strong><\/p>\n
        @RestController\n@RequestMapping(\"\/blog\")\npublic class BlogController {\n \n    @Resource\n    private IBlogService blogService;\n \n    @PutMapping(\"\/like\/{id}\")\n    public Result likeBlog(@PathVariable(\"id\") Long id) {\n        return blogService.likeBlog(id);\n    }\n \n    @GetMapping(\"\/hot\")\n    public Result queryHotBlog(@RequestParam(value = \"current\", defaultValue = \"1\") Integer current) {\n        return blogService.queryHotBlog(current);\n    }\n \n    @GetMapping(\"\/{id}\")\n    public Result queryBlogById(@PathVariable(\"id\") String id){\n        return blogService.queryBlogById(id);\n    }\n}<\/pre>\n
        \u7f16\u5199\u5b8c\u70b9\u8d5e\u64cd\u4f5c\u7684\u63a5\u53e3\u540e\u8fd8\u8981\u4fee\u6539\u4e4b\u524d\u7684\u67e5\u8be2\u63a5\u53e3\uff0c\u589e\u52a0\u67e5\u8be2\u662f\u5426\u5df2\u7ecf\u70b9\u8d5e <\/p>\n
        @Service\npublic class BlogServiceImpl extends ServiceImpl\n   \n     implements IBlogService {\n \n    @Autowired\n    private IUserService userService;\n \n    @Autowired\n    private StringRedisTemplate stringRedisTemplate;\n \n    @Override\n    public Result queryHotBlog(Integer current) {\n        \/\/ \u6839\u636e\u7528\u6237\u67e5\u8be2\n        Page\n    \n      page = query() .orderByDesc(\"liked\") .page(new Page(current, SystemConstants.MAX_PAGE_SIZE)); \/\/ \u83b7\u53d6\u5f53\u524d\u9875\u6570\u636e List\n     \n       records = page.getRecords(); \/\/ \u67e5\u8be2\u7528\u6237 records.forEach(blog -> { this.queryBlogUser(blog); this.isBlogLiked(blog); }); return Result.ok(records); } @Override public Result likeBlog(Long id) { \/\/ 1\u3001\u83b7\u53d6\u767b\u5f55\u7528\u6237 UserDTO user = UserHolder.getUser(); \/\/ 2\u3001\u5224\u65ad\u5f53\u524d\u767b\u5f55\u7528\u6237\u662f\u5426\u5df2\u7ecf\u70b9\u8d5e Boolean isMember = stringRedisTemplate.opsForSet().isMember(RedisConstants.BLOG_LIKED_KEY + id, user.getId().toString()); if(BooleanUtil.isFalse(isMember)) { \/\/ 3\u3001\u5982\u679c\u672a\u70b9\u8d5e\uff0c\u53ef\u4ee5\u70b9\u8d5e \/\/ 3.1\u3001\u6570\u636e\u5e93\u70b9\u8d5e\u6570 +1 boolean isSuccess = update().setSql(\"liked = liked+1\").eq(\"id\", id).update(); \/\/ 3.2\u3001\u4fdd\u5b58\u7528\u6237\u5230 Redis \u7684 set \u96c6\u5408 if(isSuccess){ stringRedisTemplate.opsForSet().add(RedisConstants.BLOG_LIKED_KEY + id, user.getId().toString()); } } else { \/\/ 4\u3001\u5982\u679c\u5df2\u70b9\u8d5e\uff0c\u53d6\u6d88\u70b9\u8d5e \/\/ 4.1\u3001\u6570\u636e\u5e93\u70b9\u8d5e\u6570 -1 boolean isSuccess = update().setSql(\"liked = liked - 1\").eq(\"id\", id).update(); \/\/ 4.2\u3001\u628a\u7528\u6237\u4ece Redis \u7684 set \u96c6\u5408\u79fb\u9664 if(isSuccess){ stringRedisTemplate.opsForSet().remove(RedisConstants.BLOG_LIKED_KEY + id, user.getId().toString()); } } return Result.ok(); } private void queryBlogUser(Blog blog) { Long userId = blog.getUserId(); User user = userService.getById(userId); blog.setName(user.getNickName()); blog.setIcon(user.getIcon()); } @Override public Result queryBlogById(String id) { Blog blog = getById(id); if(blog == null){ return Result.fail(\"\u7b14\u8bb0\u4e0d\u5b58\u5728\uff01\"); } queryBlogUser(blog); \/\/ \u67e5\u8be2 Blog \u662f\u5426\u88ab\u70b9\u8d5e isBlogLiked(blog); return Result.ok(blog); } private void isBlogLiked(Blog blog) { Long userId = blog.getUserId(); String key = RedisConstants.BLOG_LIKED_KEY + blog.getId(); Boolean isMember = stringRedisTemplate.opsForSet().isMember(key, userId.toString()); blog.setIsLike(BooleanUtil.isTrue(isMember)); } }\n     \n    \n   <\/pre>\n
        \u56db\u3001\u70b9\u8d5e\u6392\u884c\u699c <\/h2>\n
        <\/p>\n
        \u67e5\u51fa\u7ed9\u8fd9\u4e2a\u7b14\u8bb0\u70b9\u8d5e\u7684\u4eba\uff0c\u7c7b\u4f3c\u5fae\u4fe1\u670b\u53cb\u5708\u7684\u70b9\u8d5e\uff0c\u53ef\u4ee5\u5c55\u793a\u8c01\u70b9\u8d5e\u4e86\uff0c\u800c\u4e14\u6211\u4eec\u8981\u8fdb\u884c\u6392\u5e8f<\/p>\n
        \u6240\u4ee5\u6211\u4eec\u5f97\u7528SortedSet\u8fd9\u79cd\u6570\u636e\u7c7b\u578b<\/p>\n
        1\u3001\u4fee\u6539\u70b9\u8d5e\u903b\u8f91<\/h3>\n
        \u628a\u539f\u672c\u5b58\u5165set\u6539\u4e3a\u5b58\u5165zset\u591a\u52a0\u4e2a\u5206\u6570\uff0c\u5206\u6570\u5c31\u662f\u65f6\u95f4\u6233<\/p>\n
        @Override\n    public Result likeBlog(Long id) {\n        \/\/ 1\u3001\u83b7\u53d6\u767b\u5f55\u7528\u6237\n        UserDTO user = UserHolder.getUser();\n        \/\/ 2\u3001\u5224\u65ad\u5f53\u524d\u767b\u5f55\u7528\u6237\u662f\u5426\u5df2\u7ecf\u70b9\u8d5e\n        Double score = stringRedisTemplate.opsForZSet().score(RedisConstants.BLOG_LIKED_KEY + id, user.getId().toString());\n        if(score == null) {\n            \/\/ 3\u3001\u5982\u679c\u672a\u70b9\u8d5e\uff0c\u53ef\u4ee5\u70b9\u8d5e\n            \/\/ 3.1\u3001\u6570\u636e\u5e93\u70b9\u8d5e\u6570 +1\n            boolean isSuccess = update().setSql(\"liked = liked+1\").eq(\"id\", id).update();\n            \/\/ 3.2\u3001\u4fdd\u5b58\u7528\u6237\u5230 Redis \u7684 set \u96c6\u5408\n            if(isSuccess){\n                \/\/ \u65f6\u95f4\u4f5c\u4e3a key \u7684 score\n                stringRedisTemplate.opsForZSet().add(RedisConstants.BLOG_LIKED_KEY + id, user.getId().toString(), System.currentTimeMillis());\n            }\n        } else {\n            \/\/ 4\u3001\u5982\u679c\u5df2\u70b9\u8d5e\uff0c\u53d6\u6d88\u70b9\u8d5e\n            \/\/ 4.1\u3001\u6570\u636e\u5e93\u70b9\u8d5e\u6570 -1\n            boolean isSuccess = update().setSql(\"liked = liked - 1\").eq(\"id\", id).update();\n            \/\/ 4.2\u3001\u628a\u7528\u6237\u4ece Redis \u7684 set \u96c6\u5408\u79fb\u9664\n            if(isSuccess){\n                stringRedisTemplate.opsForZSet().remove(RedisConstants.BLOG_LIKED_KEY + id, user.getId().toString());\n            }\n        }\n        return Result.ok();\n    }<\/pre>\n
        \u7136\u540e\u662f\u5426\u88ab\u70b9\u8d5e\u7684\u65b9\u6cd5\u4e5f\u8981\u4fee\u6539\uff0c\u6839\u636ekey\u53d6\u51fa\u5206\u6570\uff0c\u5206\u6570\u4e0d\u4e3anull\u5c31\u662f\u70b9\u8d5e\u8fc7\u4e86<\/p>\n
         private void isBlogLiked(Blog blog) {\n        UserDTO user = UserHolder.getUser();\n        if(user == null){\n            return;\n        }\n        Long userId = user.getId();\n        String key = RedisConstants.BLOG_LIKED_KEY + blog.getId();\n        Double score = stringRedisTemplate.opsForZSet().score(key, userId.toString());\n        blog.setIsLike(score != null);\n    }<\/pre>\n
        2\u3001\u70b9\u8d5e\u6392\u884c\u699c\u529f\u80fd<\/h3>\n
        \u9700\u6c42\uff1a\u5b9e\u73b0\u524d\u4e94\u4e2a\u70b9\u8d5e\u7684\u7528\u6237\u8fd4\u56de<\/p>\n
        \u6211\u4eec\u5148\u7528\u52a8\u6001id\u53bbredis\u4e2d\u67e5\u8be2\u51fa\u524d\u4e94\u4e2a\u70b9\u8d5e\u7528\u6237\u7684id<\/p>\n
        \u7136\u540e\u6839\u636eid\u53bb\u6570\u636e\u5e93\u4e2d\u67e5\u8be2\u4fe1\u606f\u5c01\u88c5\u5230dto\u518d\u8fd4\u56de<\/p>\n
            @GetMapping(\"\/likes\/{id}\")\n    public Result queryBlogLikes(@PathVariable(\"id\") String id) {\n        return blogService.queryBlogLikes(id);\n    }<\/pre>\n
            @Override\n    public Result queryBlogLikes(String id) {\n        String key = RedisConstants.BLOG_LIKED_KEY + id;\n        \/\/ \u67e5\u8be2 top5 \u7684\u70b9\u8d5e\u7528\u6237\n        Set\n   \n     top5 = stringRedisTemplate.opsForZSet().range(key, 0, 4);\n        if(top5 == null){\n            return Result.ok(Collections.emptyList());\n        }\n        \/\/ \u89e3\u6790\u51fa\u5176\u4e2d\u7684\u7528\u6237id\n        List\n    \n      ids = top5.stream().map(Long::valueOf).collect(Collectors.toList()); String join = StrUtil.join(\",\", ids); \/\/ \u6839\u636e\u7528\u6237id\u67e5\u8be2\u7528\u6237 List\n     \n       userDTOS = userService.query().in(\"id\", ids).last(\"order by filed(id, \"+join+\")\").list() .stream() .map(user -> BeanUtil.copyProperties(user, UserDTO.class)) .collect(Collectors.toList()); return Result.ok(userDTOS); }\n     \n    \n   <\/pre>\n
        \u6ce8\u610f\uff1a\u5982\u679c\u6211\u4eecmp\u76f4\u63a5\u7528in\u6765\u67e5\u8be2\u6839\u672c\u4e0d\u80fd\u4fdd\u8bc1\u70b9\u8d5e\u7684\u987a\u5e8f\uff0c\u56e0\u4e3ain\u67e5\u8be2\u51fa\u6765\u7684\u662f\u6309\u7167id\u987a\u5e8f\u8fd4\u56de\u7684\uff0c\u6ca1\u6709\u6392\u5e8f\uff0c\u6211\u4eec\u8981\u6309\u7167\u67e5\u8be2id\u7684\u987a\u5e8f\u6765\u67e5\uff0corder by field(id,5,1)\u8fd9\u6837<\/p>\n","protected":false},"excerpt":{"rendered":"
        Redis\u7b14\u8bb0\u70b9\u8d5e\u6392\u884c\u699c\u7684\u5b9e\u73b0\u793a...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-201625","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/201625","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=201625"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/201625\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=201625"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=201625"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=201625"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}