{"id":202649,"date":"2025-05-22T08:14:00","date_gmt":"2025-05-22T00:14:00","guid":{"rendered":"https:\/\/server.hk\/cnblog\/202649\/"},"modified":"2025-05-22T08:14:00","modified_gmt":"2025-05-22T00:14:00","slug":"java%e5%87%bd%e6%95%b0%e4%b8%ad%e5%86%85%e5%ad%98%e7%ae%a1%e7%90%86%e7%9a%84%e6%9c%80%e4%bd%b3%e5%ae%9e%e8%b7%b5","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/202649\/","title":{"rendered":"Java\u51fd\u6570\u4e2d\u5185\u5b58\u7ba1\u7406\u7684\u6700\u4f73\u5b9e\u8df5"},"content":{"rendered":"

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

Java\u51fd\u6570\u4e2d\u5185\u5b58\u7ba1\u7406\u7684\u6700\u4f73\u5b9e\u8df5<\/h1>\n

\u5927\u5bb6\u597d\uff0c\u4eca\u5929\u672c\u4eba\u7ed9\u5927\u5bb6\u5e26\u6765\u6587\u7ae0\u300aJava\u51fd\u6570\u4e2d\u5185\u5b58\u7ba1\u7406\u7684\u6700\u4f73\u5b9e\u8df5\u300b<\/span>\uff0c\u6587\u4e2d\u5185\u5bb9\u4e3b\u8981\u6d89\u53ca\u5230<\/span><\/span>\uff0c\u5982\u679c\u4f60\u5bf9\u6587\u7ae0<\/span>\u65b9\u9762\u7684\u77e5\u8bc6\u70b9\u611f\u5174\u8da3\uff0c\u90a3\u5c31\u8bf7\u5404\u4f4d\u670b\u53cb\u7ee7\u7eed\u770b\u4e0b\u53bb\u5427~\u5e0c\u671b\u80fd\u771f\u6b63\u5e2e\u5230\u4f60\u4eec\uff0c\u8c22\u8c22\uff01<\/p>\n

Java\u51fd\u6570\u5185\u5b58\u7ba1\u7406\u6700\u4f73\u5b9e\u8df5\u6307\u5357\uff1a\u4f7f\u7528\u4f5c\u7528\u57df\u6700\u6709\u9650\u7684\u53d8\u91cf\u7c7b\u578b\uff0c\u5982\u5c40\u90e8\u53d8\u91cf\u3002\u8c28\u614e\u4f7f\u7528\u5185\u5b58\u7f13\u5b58\uff0c\u8003\u8651\u4f7f\u7528\u5f31\u5f15\u7528\u3002\u8c03\u7528\u7ed3\u675f\u540e\u91ca\u653e\u8d44\u6e90\uff0c\u4f8b\u5982\u6587\u4ef6\u53e5\u67c4\u548c\u6570\u636e\u5e93\u8fde\u63a5\u3002\u5229\u7528Java\u5783\u573e\u56de\u6536\u7cfb\u7edf\uff0c\u5e76\u8003\u8651\u4f7f\u7528object pooling\u3002\u8fdb\u884c\u5185\u5b58\u5206\u6790\uff0c\u8bc6\u522b\u6f5c\u5728\u7684\u5185\u5b58\u6cc4\u6f0f\u548c\u6027\u80fd\u74f6\u9888\u3002<\/p>\n

<\/p>\n

Java \u51fd\u6570\u4e2d\u5185\u5b58\u7ba1\u7406\u7684\u6700\u4f73\u5b9e\u8df5<\/strong><\/p>\n

\u7b80\u4ecb<\/strong><\/p>\n

\u5185\u5b58\u7ba1\u7406\u662f Java \u7f16\u7a0b\u4e2d\u81f3\u5173\u91cd\u8981\u7684\u4e00\u65b9\u9762\u3002\u9075\u5faa\u6700\u4f73\u5b9e\u8df5\u6709\u52a9\u4e8e\u907f\u514d\u5185\u5b58\u6cc4\u6f0f\u548c\u6027\u80fd\u4e0b\u964d\uff0c\u4ece\u800c\u63d0\u9ad8\u5e94\u7528\u7a0b\u5e8f\u7684\u5065\u58ee\u6027\u548c\u53ef\u4f38\u7f29\u6027\u3002<\/p>\n

\u5b9e\u6218\u6848\u4f8b<\/strong><\/p>\n

\u4ee5\u4e0b\u662f\u4e00\u4f4d\u7528\u6237\u751f\u6210\u5185\u5bb9\u5e73\u53f0\u7684\u793a\u4f8b\u573a\u666f\uff1a<\/p>\n

public class ContentManager {\n\n    private Map<String, List<Content>> contentByUser;\n\n    \/\/ \u52a0\u8f7d\u7528\u6237\u5185\u5bb9\u5230\u5185\u5b58\n    public void loadContent() {\n        contentByUser = new HashMap<>();\n        for (User user : getUsers()) {\n            List<Content> userContent = getContentForUser(user.getId());\n            contentByUser.put(user.getUsername(), userContent);\n        }\n    }\n\n    \/\/ \u83b7\u53d6\u6307\u5b9a\u7528\u6237\u7684\u5185\u5bb9\n    public List<Content> getUserContent(String username) {\n        return contentByUser.get(username);\n    }\n}<\/pre>\n
\u6700\u4f73\u5b9e\u8df5<\/strong><\/p>\n
    \n
  1. \u4f7f\u7528\u4f5c\u7528\u57df\u6700\u6709\u9650\u7684\u53d8\u91cf\u7c7b\u578b\uff1a<\/strong>\u4f7f\u7528\u5c40\u90e8\u53d8\u91cf\u800c\u4e0d\u662f\u5b9e\u4f8b\u53d8\u91cf\uff0c\u56e0\u4e3a\u5b83\u4eec\u4ec5\u5728\u51fd\u6570\u8c03\u7528\u671f\u95f4\u5b58\u5728\uff0c\u4ece\u800c\u51cf\u5c11\u4e86\u5185\u5b58\u5360\u7528\u3002<\/li>\n
  2. \u8c28\u614e\u4f7f\u7528\u5185\u5b58\u7f13\u5b58\uff1a<\/strong>\u7f13\u5b58\u53ef\u4ee5\u63d0\u9ad8\u6027\u80fd\uff0c\u4f46\u5fc5\u987b\u5c0f\u5fc3\u5904\u7406\uff0c\u56e0\u4e3a\u5b83\u4eec\u4f1a\u4fdd\u7559\u5bf9\u8c61\u7684\u5f3a\u5f15\u7528\uff0c\u4ece\u800c\u5bfc\u81f4\u5185\u5b58\u6cc4\u6f0f\u3002\u8003\u8651\u4f7f\u7528\u5f31\u5f15\u7528\u6765\u51cf\u8f7b\u8fd9\u4e2a\u95ee\u9898\u3002<\/li>\n
  3. \u8c03\u7528\u7ed3\u675f\u540e\u91ca\u653e\u8d44\u6e90\uff1a<\/strong>\u5173\u95ed\u6587\u4ef6\u53e5\u67c4\u3001\u6570\u636e\u5e93\u8fde\u63a5\u548c\u7f51\u7edc\u8fde\u63a5\uff0c\u4ee5\u907f\u514d\u5185\u5b58\u6cc4\u6f0f\u548c\u7cfb\u7edf\u8d44\u6e90\u8017\u5c3d\u3002\u4f7f\u7528 try-with-resources \u8bed\u6cd5\u6765\u7b80\u5316\u6b64\u8fc7\u7a0b\u3002<\/li>\n
  4. \u5229\u7528\u5783\u573e\u56de\u6536\uff1a<\/strong>Java \u7684\u81ea\u52a8\u5783\u573e\u56de\u6536\u7cfb\u7edf\u53ef\u4ee5\u5e2e\u52a9\u6e05\u7406\u672a\u4f7f\u7528\u7684\u5bf9\u8c61\u3002\u901a\u8fc7\u8c03\u7528 System.gc() \u53ef\u4ee5\u8bf7\u6c42\u5783\u573e\u56de\u6536\uff0c\u4f46\u8981\u6ce8\u610f\u8fd9\u4e0d\u80fd\u4fdd\u8bc1\u7acb\u5373\u53d1\u751f\u5783\u573e\u56de\u6536\u3002<\/li>\n
  5. \u4f7f\u7528 object pooling\uff1a<\/strong>\u6709\u4e9b\u60c5\u51b5\u4e0b\uff0c\u521b\u5efa\u5927\u91cf\u77ed\u5bff\u547d\u5bf9\u8c61\u53ef\u80fd\u4f1a\u5bfc\u81f4\u6027\u80fd\u95ee\u9898\u3002object pooling \u901a\u8fc7\u91cd\u7528\u73b0\u6709\u7684\u5bf9\u8c61\u5b9e\u4f8b\u6765\u51cf\u5c11\u521b\u5efa\u548c\u6e05\u7406\u5bf9\u8c61\u7684\u5f00\u9500\u3002<\/li>\n
  6. \u8003\u8651\u5185\u5b58\u5206\u6790\uff1a<\/strong>\u4f7f\u7528 Java Mission Control \u6216 JProfiler \u7b49\u5de5\u5177\u5206\u6790\u5185\u5b58\u4f7f\u7528\u60c5\u51b5\uff0c\u8bc6\u522b\u6f5c\u5728\u7684\u5185\u5b58\u6cc4\u6f0f\u548c\u6027\u80fd\u74f6\u9888\u3002<\/li>\n<\/ol>\n
    \u5177\u4f53\u5b9e\u73b0<\/strong><\/p>\n
    \u5728\u4e0a\u9762\u7ed9\u51fa\u7684\u793a\u4f8b\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528 ConcurrentHashMap<\/code> \u4ee3\u66ff HashMap<\/code>\uff0c\u56e0\u4e3a\u5b83\u5141\u8bb8\u5728\u5e76\u53d1\u8bbf\u95ee\u4e2d\u5b89\u5168\u5730\u5220\u9664\u5143\u7d20\uff0c\u4ece\u800c\u51cf\u5c11\u4e86\u5185\u5b58\u6cc4\u6f0f\u7684\u98ce\u9669\u3002<\/p>\n
    private ConcurrentHashMap<String, List<Content>> contentByUser;<\/pre>\n
    \u6b64\u5916\uff0c\u53ef\u4ee5\u4f7f\u7528 WeakHashMap<\/code> \u6765\u5b58\u50a8\u7528\u6237\u5185\u5bb9\uff0c\u4ee5\u4fbf\u5728\u7528\u6237\u4e0d\u518d\u88ab\u5f15\u7528\u65f6\u81ea\u52a8\u6e05\u7406\u5b83\u4eec\u3002<\/p>\n
    private WeakHashMap<String, List<Content>> contentByUser;<\/pre>\n
    \u901a\u8fc7\u9075\u5faa\u8fd9\u4e9b\u6700\u4f73\u5b9e\u8df5\uff0c\u53ef\u4ee5\u786e\u4fdd Java \u51fd\u6570\u4e2d\u7684\u5185\u5b58\u7ba1\u7406\u9ad8\u6548\u4e14\u65e0\u9519\u8bef\uff0c\u4ece\u800c\u63d0\u9ad8\u5e94\u7528\u7a0b\u5e8f\u7684\u6027\u80fd\u548c\u53ef\u7ef4\u62a4\u6027\u3002<\/p>\n
    \u4eca\u5929\u5173\u4e8e\u300aJava\u51fd\u6570\u4e2d\u5185\u5b58\u7ba1\u7406\u7684\u6700\u4f73\u5b9e\u8df5\u300b\u7684\u5185\u5bb9\u4ecb\u7ecd\u5c31\u5230\u6b64\u7ed3\u675f\uff0c\u5982\u679c\u6709\u4ec0\u4e48\u7591\u95ee\u6216\u8005\u5efa\u8bae\uff0c\u53ef\u4ee5\u5728\u516c\u4f17\u53f7\u4e0b\u591a\u591a\u56de\u590d\u4ea4\u6d41\uff1b\u6587\u4e2d\u82e5\u6709\u4e0d\u6b63\u4e4b\u5904\uff0c\u4e5f\u5e0c\u671b\u56de\u590d\u7559\u8a00\u4ee5\u544a\u77e5\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
    Java\u51fd\u6570\u4e2d\u5185\u5b58\u7ba1\u7406\u7684\u6700\u4f73\u5b9e\u8df5...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4925],"tags":[],"class_list":["post-202649","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202649","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=202649"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202649\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=202649"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=202649"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=202649"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}