{"id":3275,"date":"2024-06-20T15:00:59","date_gmt":"2024-06-20T07:00:59","guid":{"rendered":"https:\/\/www.talktop.cn\/?p=3275"},"modified":"2024-12-07T17:19:48","modified_gmt":"2024-12-07T09:19:48","slug":"java%e4%b8%ad%e7%9a%84threadlocal%e6%8a%80%e6%9c%af%e8%af%a6%e8%a7%a3","status":"publish","type":"post","link":"https:\/\/www.talktop.cn\/?p=3275","title":{"rendered":"Java\u4e2d\u7684ThreadLocal\u6280\u672f\u8be6\u89e3"},"content":{"rendered":"\n

\u5728Java\u5e76\u53d1\u7f16\u7a0b\u4e2d\uff0cThreadLocal<\/code>\u662f\u4e00\u4e2a\u975e\u5e38\u91cd\u8981\u7684\u5de5\u5177\u3002\u5b83\u4e3a\u6bcf\u4e2a\u7ebf\u7a0b\u63d0\u4f9b\u4e86\u72ec\u7acb\u7684\u53d8\u91cf\u526f\u672c\uff0c\u4ece\u800c\u907f\u514d\u4e86\u591a\u4e2a\u7ebf\u7a0b\u8bbf\u95ee\u540c\u4e00\u53d8\u91cf\u65f6\u7684\u7ade\u4e89\u95ee\u9898\u3002ThreadLocal<\/code>\u4e3b\u8981\u7528\u4e8e\u89e3\u51b3\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b\u7684\u53d8\u91cf\u9694\u79bb\u95ee\u9898\uff0c\u4f7f\u6bcf\u4e2a\u7ebf\u7a0b\u62e5\u6709\u81ea\u5df1\u72ec\u7acb\u7684\u4e00\u4efd\u53d8\u91cf\uff0c\u4ece\u800c\u4fdd\u8bc1\u7ebf\u7a0b\u5b89\u5168\u3002<\/p>\n\n\n\n

\u4e00\u3001ThreadLocal\u6784\u6210<\/h5>\n\n\n\n

ThreadLocal<\/code>\u7c7b\u4f4d\u4e8ejava.lang<\/code>\u5305\u4e2d\uff0c\u5176\u6838\u5fc3\u7ed3\u6784\u5305\u62ec\u4ee5\u4e0b\u51e0\u4e2a\u90e8\u5206\uff1a<\/p>\n\n\n\n

\uff081\uff09ThreadLocal\u7c7b<\/strong>\uff1aThreadLocal<\/code>\u7c7b\u672c\u8eab\uff0c\u63d0\u4f9b\u4e86get<\/code>\u548cset<\/code>\u65b9\u6cd5\u7528\u4e8e\u83b7\u53d6\u548c\u8bbe\u7f6e\u7ebf\u7a0b\u5c40\u90e8\u53d8\u91cf\u3002<\/p>\n\n\n\n

\uff082\uff09ThreadLocalMap<\/strong>\uff1aThreadLocal<\/code>\u7684\u5185\u90e8\u7c7b\uff0c\u7528\u4e8e\u5b58\u50a8\u6bcf\u4e2a\u7ebf\u7a0b\u7684\u53d8\u91cf\u526f\u672c\u3002\u6bcf\u4e2a\u7ebf\u7a0b\u5185\u90e8\u7ef4\u62a4\u4e00\u4e2aThreadLocalMap<\/code>\uff0c\u8be5ThreadLocalMap<\/code>\u4ee5ThreadLocal<\/code>\u5bf9\u8c61\u4e3a\u952e\uff0c\u5b58\u50a8\u5bf9\u5e94\u7684\u7ebf\u7a0b\u5c40\u90e8\u53d8\u91cf\u503c\u3002<\/p>\n\n\n\n

\uff083\uff09Thread\u7c7b<\/strong>\uff1aJava\u7ebf\u7a0b\u7c7b\u4e2d\u6709\u4e00\u4e2a\u7c7b\u578b\u4e3aThreadLocalMap<\/code>\u7684\u6210\u5458\u53d8\u91cf\uff0c\u7528\u4e8e\u5b58\u50a8\u8be5\u7ebf\u7a0b\u6240\u6709\u7684ThreadLocal<\/code>\u53d8\u91cf\u3002<\/p>\n\n\n\n

ThreadLocal\u7c7b\u7684\u7ee7\u627f\u5b9e\u73b0\u5173\u7cfb<\/h6>\n\n\n\n

ThreadLocal<\/code>\u7c7b\u6ca1\u6709\u7ee7\u627f\u5176\u4ed6\u7c7b\uff0c\u4f46\u5176\u8bbe\u8ba1\u5229\u7528\u4e86\u6cdb\u578b\u6765\u5b9a\u4e49\u7ebf\u7a0b\u5c40\u90e8\u53d8\u91cf\u7684\u7c7b\u578b\u3002\u4ee5\u4e0b\u662fThreadLocal<\/code>\u7c7b\u7684\u5b9a\u4e49\uff1a<\/p>\n\n\n\n

public class ThreadLocal<T> {\n    \/\/ \u5185\u90e8\u9759\u6001\u7c7b ThreadLocalMap\n    static class ThreadLocalMap {\n        \/\/ Entry\u7ee7\u627fWeakReference\uff0c\u907f\u514d\u5185\u5b58\u6cc4\u6f0f\n        static class Entry extends WeakReference<ThreadLocal<?>> {\n            Object value;\n            Entry(ThreadLocal<?> k, Object v) {\n                super(k);\n                value = v;\n            }\n        }\n        \/\/ \u5176\u4ed6\u76f8\u5173\u4ee3\u7801\n    }\n\n    \/\/ \u6838\u5fc3\u65b9\u6cd5\n    public T get() {\n        \/\/ \u83b7\u53d6\u5f53\u524d\u7ebf\u7a0b\n        Thread t = Thread.currentThread();\n        \/\/ \u83b7\u53d6\u5f53\u524d\u7ebf\u7a0b\u7684ThreadLocalMap\n        ThreadLocalMap map = getMap(t);\n        if (map != null) {\n            ThreadLocalMap.Entry e = map.getEntry(this);\n            if (e != null) {\n                @SuppressWarnings(\"unchecked\")\n                T result = (T)e.value;\n                return result;\n            }\n        }\n        return setInitialValue();\n    }\n\n    public void set(T value) {\n        Thread t = Thread.currentThread();\n        ThreadLocalMap map = getMap(t);\n        if (map != null) {\n            map.set(this, value);\n        } else {\n            createMap(t, value);\n        }\n    }\n\n    protected T initialValue() {\n        return null;\n    }\n\n    private T setInitialValue() {\n        T value = initialValue();\n        Thread t = Thread.currentThread();\n        ThreadLocalMap map = getMap(t);\n        if (map != null) {\n            map.set(this, value);\n        } else {\n            createMap(t, value);\n        }\n        return value;\n    }\n\n    ThreadLocalMap getMap(Thread t) {\n        return t.threadLocals;\n    }\n\n    void createMap(Thread t, T firstValue) {\n        t.threadLocals = new ThreadLocalMap(this, firstValue);\n    }\n}<\/code><\/pre>\n\n\n\n
ThreadLocalMap\u7684\u6784\u6210<\/h6>\n\n\n\n
ThreadLocalMap<\/code>\u662fThreadLocal<\/code>\u7684\u4e00\u4e2a\u9759\u6001\u5185\u90e8\u7c7b\uff0c\u4e13\u95e8\u7528\u6765\u5b58\u50a8\u6bcf\u4e2a\u7ebf\u7a0b\u7684\u5c40\u90e8\u53d8\u91cf\u3002\u5b83\u7684\u5b9e\u73b0\u7c7b\u4f3c\u4e8e\u4e00\u4e2a\u54c8\u5e0c\u8868\uff0c\u4f46\u505a\u4e86\u7279\u6b8a\u4f18\u5316\u3002\u5176\u5173\u952e\u90e8\u5206\u5305\u62ec\uff1a<\/p>\n\n\n\n
    \n
  1. Entry\u7c7b<\/strong>\uff1a\u7ee7\u627f\u81eaWeakReference<\/code>\uff0c\u7528\u4e8e\u5b58\u50a8ThreadLocal<\/code>\u5bf9\u8c61\u548c\u5bf9\u5e94\u7684\u503c\u3002\u4f7f\u7528\u5f31\u5f15\u7528\u53ef\u4ee5\u9632\u6b62\u5185\u5b58\u6cc4\u6f0f\uff0c\u5373\u5f53ThreadLocal<\/code>\u5bf9\u8c61\u6ca1\u6709\u5176\u4ed6\u5f3a\u5f15\u7528\u65f6\uff0c\u53ef\u4ee5\u88ab\u5783\u573e\u56de\u6536\u3002<\/li>\n<\/ol>\n\n\n\n
    static<\/span> class<\/span> Entry<\/span> extends<\/span> WeakReference<\/span><ThreadLocal<?>> {\n    Object value;\n\n    Entry(ThreadLocal<?> k, Object v) {\n        super<\/span>(k);\n        value = v;\n    }\n}<\/code><\/pre>\n\n\n\n
        2.\u5b58\u50a8\u7ed3\u6784<\/strong>\uff1aThreadLocalMap<\/code>\u4f7f\u7528\u4e00\u4e2aEntry<\/code>\u6570\u7ec4\u6765\u5b58\u50a8\u6570\u636e\uff0c\u6bcf\u4e2aThreadLocal<\/code>\u5b9e\u4f8b\u5bf9\u5e94\u4e00\u4e2aEntry<\/code>\u3002\u5f53ThreadLocal<\/code>\u5b9e\u4f8b\u8c03\u7528set<\/code>\u65b9\u6cd5\u65f6\uff0c\u4f1a\u5c06\u6570\u636e\u5b58\u50a8\u5728\u5f53\u524d\u7ebf\u7a0b\u7684ThreadLocalMap<\/code>\u4e2d\u3002<\/p>\n\n\n\n
    ThreadLocalMap(ThreadLocal<?> firstKey, Object firstValue) {\n    table = new Entry[INITIAL_CAPACITY];\n    int i = firstKey.threadLocalHashCode & (INITIAL_CAPACITY - 1);\n    table[i] = new Entry(firstKey, firstValue);\n    size = 1;\n    setThreshold(INITIAL_CAPACITY);\n}<\/code><\/pre>\n\n\n\n
    \u4e8c\u3001\u4f5c\u7528\u53ca\u5e94\u7528\u573a\u666f<\/h5>\n\n\n\n
    ThreadLocal<\/code>\u7684\u4e3b\u8981\u4f5c\u7528\u662f\u63d0\u4f9b\u7ebf\u7a0b\u5185\u90e8\u7684\u5c40\u90e8\u53d8\u91cf\uff0c\u8fd9\u4e9b\u53d8\u91cf\u5728\u7ebf\u7a0b\u5185\u662f\u72ec\u7acb\u7684\uff0c\u7ebf\u7a0b\u4e4b\u95f4\u4e0d\u4f1a\u4e92\u76f8\u5f71\u54cd\u3002\u5e38\u89c1\u7684\u5e94\u7528\u573a\u666f\u5305\u62ec\uff1a<\/p>\n\n\n\n
      \n
    1. \u6570\u636e\u5e93\u8fde\u63a5\u7ba1\u7406<\/strong>\uff1a\u5728\u4e00\u4e2a\u591a\u7ebf\u7a0b\u5e94\u7528\u4e2d\uff0c\u6bcf\u4e2a\u7ebf\u7a0b\u53ef\u80fd\u9700\u8981\u72ec\u7acb\u7684\u6570\u636e\u5e93\u8fde\u63a5\uff0c\u901a\u8fc7ThreadLocal<\/code>\u53ef\u4ee5\u786e\u4fdd\u6bcf\u4e2a\u7ebf\u7a0b\u62e5\u6709\u72ec\u7acb\u7684\u6570\u636e\u5e93\u8fde\u63a5\u5b9e\u4f8b\u3002<\/li>\n\n\n\n
    2. \u4f1a\u8bdd\u7ba1\u7406<\/strong>\uff1a\u5728Web\u5e94\u7528\u4e2d\uff0c\u53ef\u4ee5\u901a\u8fc7ThreadLocal<\/code>\u5b58\u50a8\u6bcf\u4e2a\u7528\u6237\u7684\u4f1a\u8bdd\u4fe1\u606f\uff0c\u786e\u4fdd\u7ebf\u7a0b\u5b89\u5168\u3002<\/li>\n\n\n\n
    3. \u4e8b\u52a1\u7ba1\u7406<\/strong>\uff1a\u5728\u5206\u5e03\u5f0f\u7cfb\u7edf\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528ThreadLocal<\/code>\u6765\u7ba1\u7406\u6bcf\u4e2a\u7ebf\u7a0b\u7684\u4e8b\u52a1\u72b6\u6001\uff0c\u4fdd\u8bc1\u4e8b\u52a1\u9694\u79bb\u6027\u3002<\/li>\n<\/ol>\n\n\n\n
      \u5b9e\u9645\u9879\u76ee\u4e2d\u7684\u5e94\u7528\u5b9e\u4f8b<\/h6>\n\n\n\n
      1. \u6570\u636e\u5e93\u8fde\u63a5\u7ba1\u7406<\/h6>\n\n\n\n
      \u5728\u591a\u7ebf\u7a0b\u73af\u5883\u4e2d\uff0c\u6bcf\u4e2a\u7ebf\u7a0b\u53ef\u80fd\u9700\u8981\u72ec\u7acb\u7684\u6570\u636e\u5e93\u8fde\u63a5\uff0c\u901a\u8fc7ThreadLocal<\/code>\u53ef\u4ee5\u786e\u4fdd\u6bcf\u4e2a\u7ebf\u7a0b\u62e5\u6709\u72ec\u7acb\u7684\u6570\u636e\u5e93\u8fde\u63a5\u5b9e\u4f8b\u3002<\/p>\n\n\n\n
      import java.sql.Connection;\nimport java.sql.DriverManager;\nimport java.sql.SQLException;\n\npublic class ConnectionManager {\n    private static final String URL = \"jdbc:mysql:\/\/localhost:3306\/testdb\";\n    private static final String USERNAME = \"root\";\n    private static final String PASSWORD = \"password\";\n\n    private static ThreadLocal<Connection> connectionHolder = ThreadLocal.withInitial(() -> {\n        try {\n            return DriverManager.getConnection(URL, USERNAME, PASSWORD);\n        } catch (SQLException e) {\n            throw new RuntimeException(\"Failed to create a database connection\", e);\n        }\n    });\n\n    public static Connection getConnection() {\n        return connectionHolder.get();\n    }\n\n    public static void closeConnection() {\n        Connection connection = connectionHolder.get();\n        if (connection != null) {\n            try {\n                connection.close();\n            } catch (SQLException e) {\n                e.printStackTrace();\n            } finally {\n                connectionHolder.remove();\n            }\n        }\n    }\n}<\/code><\/pre>\n\n\n\n
      2. \u7528\u6237\u4f1a\u8bdd\u7ba1\u7406<\/h6>\n\n\n\n
      \u5728Web\u5e94\u7528\u4e2d\uff0c\u6bcf\u4e2a\u8bf7\u6c42\u5bf9\u5e94\u4e00\u4e2a\u7ebf\u7a0b\uff0c\u53ef\u4ee5\u901a\u8fc7ThreadLocal<\/code>\u5b58\u50a8\u6bcf\u4e2a\u7528\u6237\u7684\u4f1a\u8bdd\u4fe1\u606f\uff0c\u786e\u4fdd\u7ebf\u7a0b\u5b89\u5168\u3002<\/p>\n\n\n\n
      public class UserContext {\n    private static ThreadLocal<String> currentUser = new ThreadLocal<>();\n\n    public static void setCurrentUser(String user) {\n        currentUser.set(user);\n    }\n\n    public static String getCurrentUser() {\n        return currentUser.get();\n    }\n\n    public static void clear() {\n        currentUser.remove();\n    }\n}\n\n\/\/ \u5728Servlet\u4e2d\u4f7f\u7528\npublic class UserServlet extends HttpServlet {\n    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {\n        try {\n            \/\/ \u8bbe\u7f6e\u5f53\u524d\u7528\u6237\n            UserContext.setCurrentUser(request.getParameter(\"user\"));\n            \/\/ \u5904\u7406\u7528\u6237\u8bf7\u6c42\n            processRequest(request, response);\n        } finally {\n            \/\/ \u6e05\u9664\u7528\u6237\u4fe1\u606f\n            UserContext.clear();\n        }\n    }\n    \n    private void processRequest(HttpServletRequest request, HttpServletResponse response) {\n        \/\/ \u83b7\u53d6\u5f53\u524d\u7528\u6237\n        String user = UserContext.getCurrentUser();\n        \/\/ \u5904\u7406\u4e1a\u52a1\u903b\u8f91\n    }\n}<\/code><\/pre>\n\n\n\n
      \u4e09\u3001\u4f7f\u7528\u6ce8\u610f\u4e8b\u9879<\/h5>\n\n\n\n
      \u867d\u7136ThreadLocal<\/code>\u662f\u4e00\u4e2a\u975e\u5e38\u6709\u7528\u7684\u5de5\u5177\uff0c\u4f46\u5728\u4f7f\u7528\u65f6\u9700\u8981\u6ce8\u610f\u4ee5\u4e0b\u51e0\u70b9\uff1a<\/p>\n\n\n\n
        \n
      1. \u5185\u5b58\u6cc4\u6f0f<\/strong>\uff1aThreadLocal<\/code>\u53d8\u91cf\u5fc5\u987b\u624b\u52a8\u6e05\u7406\uff0c\u5426\u5219\u53ef\u80fd\u5bfc\u81f4\u5185\u5b58\u6cc4\u6f0f\u3002\u4f7f\u7528\u5b8c\u6bd5\u540e\u5e94\u8c03\u7528remove<\/code>\u65b9\u6cd5\u79fb\u9664\u7ebf\u7a0b\u5c40\u90e8\u53d8\u91cf\u3002<\/li>\n\n\n\n
      2. \u6b63\u786e\u521d\u59cb\u5316<\/strong>\uff1a\u786e\u4fddThreadLocal<\/code>\u53d8\u91cf\u7684\u521d\u59cb\u503c\u6b63\u786e\uff0c\u5426\u5219\u53ef\u80fd\u5bfc\u81f4\u7ebf\u7a0b\u95f4\u6570\u636e\u4e0d\u4e00\u81f4\u3002<\/li>\n\n\n\n
      3. \u6027\u80fd\u95ee\u9898<\/strong>\uff1aThreadLocal<\/code>\u867d\u7136\u80fd\u591f\u89e3\u51b3\u5e76\u53d1\u95ee\u9898\uff0c\u4f46\u5176\u5e95\u5c42\u5b9e\u73b0\u4f9d\u8d56\u4e8e\u7ebf\u7a0bID\uff0c\u9891\u7e41\u7684\u521b\u5efa\u548c\u9500\u6bc1\u7ebf\u7a0b\u4f1a\u5f71\u54cd\u6027\u80fd\u3002\u56e0\u6b64\uff0c\u9002\u7528\u4e8e\u7ebf\u7a0b\u751f\u547d\u5468\u671f\u8f83\u957f\u7684\u573a\u666f\u3002<\/li>\n\n\n\n
      4. \u907f\u514d\u590d\u6742\u903b\u8f91<\/strong>\uff1aThreadLocal<\/code>\u9002\u5408\u5b58\u50a8\u7b80\u5355\u7684\u5bf9\u8c61\u6216\u72b6\u6001\u4fe1\u606f\uff0c\u4e0d\u9002\u5408\u5b58\u50a8\u590d\u6742\u7684\u4e1a\u52a1\u903b\u8f91\uff0c\u907f\u514d\u4ee3\u7801\u96be\u4ee5\u7ef4\u62a4\u3002<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"
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