{"id":31679,"date":"2023-05-12T08:23:35","date_gmt":"2023-04-20T23:41:20","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%85%b3%e4%ba%8ejava%e7%9a%84threadlocal%e5%92%8c%e7%ba%bf%e7%a8%8b%e5%ae%89%e5%85%a8%e9%97%ae%e9%a2%98\/"},"modified":"2024-04-30T03:47:17","modified_gmt":"2024-04-29T19:47:17","slug":"%e5%85%b3%e4%ba%8ejava%e7%9a%84threadlocal%e5%92%8c%e7%ba%bf%e7%a8%8b%e5%ae%89%e5%85%a8%e9%97%ae%e9%a2%98","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%85%b3%e4%ba%8ejava%e7%9a%84threadlocal%e5%92%8c%e7%ba%bf%e7%a8%8b%e5%ae%89%e5%85%a8%e9%97%ae%e9%a2%98\/","title":{"rendered":"\u5173\u4e8eJava\u7684ThreadLocal\u548c\u7ebf\u7a0b\u5b89\u5168\u95ee\u9898"},"content":{"rendered":"

\u9996\u5148<\/h2>\n

\u5728\u4f7f\u7528Struts\u5f00\u53d1\u7cfb\u7edf\u65f6\uff0c\u9047\u5230\u4e86Action\u4e2d\u5b58\u50a8\u7684\u503c\u672a\u80fd\u53cd\u6620\u5230JSP\u7684\u95ee\u9898\u3002\u8c03\u67e5\u7ed3\u679c\u8868\u660e\uff0c\u95ee\u9898\u7684\u539f\u56e0\u662f\u5728Action\u7684execute\u65b9\u6cd5\u4e2d\u5c06\u53c2\u6570\u5b58\u50a8\u5230\u4e86Action\u7684\u5b9e\u4f8b\u53d8\u91cf\u4e2d\u5e76\u4f7f\u7528\u3002\u4ee5\u4e0b\u5c06\u89e3\u91ca\u5bfc\u81f4\u95ee\u9898\u7684\u6e90\u4ee3\u7801\u548c\u89e3\u51b3\u65b9\u6cd5\u3002\u793a\u4f8b\u4ee3\u7801\u5982\u4e0b\u3002<\/p>\n

\u591a\u7ebf\u7a0b\u548c\u7ebf\u7a0b\u5b89\u5168<\/h2>\n

\u7ebf\u7a0b\u5b89\u5168\u6307\u7684\u662f\u5e94\u7528\u7a0b\u5e8f\u80fd\u591f\u5728\u591a\u7ebf\u7a0b\u4e2d\u8fd0\u884c\uff08\u591a\u4e2a\u7ebf\u7a0b\u540c\u65f6\u5e76\u884c\u6267\u884c\uff09\u800c\u6ca1\u6709\u95ee\u9898\u3002\u5982\u679c\u4e0d\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\u8bdd\uff0c\u53ef\u80fd\u4f1a\u51fa\u73b0\u5728\u4e00\u4e2a\u7ebf\u7a0b\u4e2d\u5bf9\u5171\u4eab\u6570\u636e\u6240\u505a\u7684\u66f4\u6539\u88ab\u5176\u4ed6\u7ebf\u7a0b\u8986\u76d6\u7684\u60c5\u51b5\u3002\u7528\u4e8e\u670d\u52a1\u5668\u7684\u8f6f\u4ef6\uff0c\u5982Web\u670d\u52a1\u5668\u548c\u6570\u636e\u5e93\uff0c\u901a\u5e38\u662f\u4ee5\u591a\u7ebf\u7a0b\uff08\u591a\u8fdb\u7a0b\uff09\u65b9\u5f0f\u8fd0\u884c\u7684\uff0c\u56e0\u6b64\u5728\u5f00\u53d1\u670d\u52a1\u5668\u5e94\u7528\u7a0b\u5e8f\u65f6\uff0c\u6700\u597d\u80fd\u591f\u901a\u8fc7\u591a\u7ebf\u7a0b\u6765\u5b9e\u73b0\u3002<\/p>\n

\u5728Java\u4e2d\uff0c\u4ec5\u9650\u4e8e\u5c40\u90e8\u53d8\u91cf\u7684\u60c5\u51b5\u4e0b\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\u3002<\/h2>\n

\u5728Java\u7684\u5185\u5b58\u7a7a\u95f4\u4e2d\uff0c\u4e3b\u8981\u5206\u4e3a\u4e24\u79cd\uff1a\u6808\u533a\u548c\u5806\u533a\u3002\u6808\u533a\u662f\u4e3a\u6bcf\u4e2a\u7ebf\u7a0b\u51c6\u5907\u7684\uff0c\u6808\u533a\u4e2d\u7684\u6570\u636e\u4e0d\u4f1a\u53d7\u5230\u5176\u4ed6\u7ebf\u7a0b\u7684\u5f71\u54cd\u3002\u76f8\u53cd\uff0c\u5806\u533a\u4e2d\u7684\u6570\u636e\u6709\u53ef\u80fd\u88ab\u591a\u4e2a\u7ebf\u7a0b\u5171\u4eab\uff0c\u6839\u636e\u8bbf\u95ee\u987a\u5e8f\u53ef\u80fd\u4f1a\u4ea7\u751f\u610f\u6599\u4e4b\u5916\u7684\u7ed3\u679c\u3002\u5c40\u90e8\u53d8\u91cf\u7531\u6808\u533a\u7ba1\u7406\uff0c\u56e0\u6b64\u7ebf\u7a0b\u5b89\u5168\u3002\u800c\u7c7b\u53d8\u91cf\u548c\u5b9e\u4f8b\u53d8\u91cf\u7531\u5806\u533a\u7ba1\u7406\uff0c\u6240\u4ee5\u4e0d\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\u3002<\/p>\n

\n
\u5909\u6570\u5185\u5bb9\u30e1\u30e2\u30ea\u9818\u57df\u30b9\u30ec\u30c3\u30c9\u30bb\u30fc\u30d5\u30af\u30e9\u30b9\u5909\u6570\u30af\u30e9\u30b9\u3067\u5171\u7528\u3055\u308c\u308b\u5909\u6570\u30d2\u30fc\u30d7\u9818\u57df\u30b9\u30ec\u30c3\u30c9\u30bb\u30fc\u30d5\u3067\u306a\u3044\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5909\u6570\u30af\u30e9\u30b9\u304b\u3089\u751f\u6210\u3055\u308c\u305f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u30d2\u30fc\u30d7\u9818\u57df\u30b9\u30ec\u30c3\u30c9\u30bb\u30fc\u30d5\u3067\u306a\u3044\u30ed\u30fc\u30ab\u30eb\u5909\u6570\u30e1\u30bd\u30c3\u30c9\u3084\u30d6\u30ed\u30c3\u30af\u5185\u3067\u4f7f\u308f\u308c\u308b\u5909\u6570\u30b9\u30bf\u30c3\u30af\u9818\u57df\u30b9\u30ec\u30c3\u30c9\u30bb\u30fc\u30d5<\/div>\n<\/div>\n

\u4e0d\u662f\u7ebf\u7a0b\u5b89\u5168\u7684Action<\/h2>\n

\u6211\u5c1d\u8bd5\u5b9e\u73b0\u4e86\u4e0b\u9762\u7684\u7c7b\u56fe\uff0c\u4ee5\u518d\u73b0\u5728Web\u5e94\u7528\u7a0b\u5e8f\u4e2d\u6b63\u5728\u53d1\u751f\u7684\u4e8b\u60c5\u3002<\/p>\n

\"ThreadSafe.png\"<\/div>\n

\u6709\u4ee5\u4e0b\u8fd9\u6837\u7684ActionForm\u3002<\/p>\n

public<\/span> class<\/span> ActionForm<\/span> {<\/span>\r\n\r\n    private<\/span> String<\/span> message<\/span>;<\/span>\r\n\r\n    public<\/span> String<\/span> getMessage<\/span>()<\/span> {<\/span>\r\n        return<\/span> message<\/span>;<\/span>\r\n    }<\/span>\r\n\r\n    public<\/span> void<\/span> setMessage<\/span>(<\/span>String<\/span> message<\/span>)<\/span> {<\/span>\r\n        this<\/span>.<\/span>message<\/span> =<\/span> message<\/span>;<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
CustomAction\u7c7b\u5c06ActionFrom\u5bf9\u8c61\u4ece\u5c40\u90e8\u53d8\u91cf\uff08\u5806\u6808\u533a\u57df\uff09\u5b58\u50a8\u5230\u5b9e\u4f8b\u53d8\u91cf\uff08\u5806\u533a\u57df\uff09\u4e2d\u3002<\/p>\n
public<\/span> class<\/span> CustomAction<\/span> extends<\/span> Action<\/span> {<\/span>\r\n\r\n    protected<\/span> ActionForm<\/span> unsafeActionForm<\/span>;<\/span>\r\n\r\n    @Override<\/span>\r\n    public<\/span> void<\/span> execute<\/span>(<\/span>ActionForm<\/span> safeActionForm<\/span>)<\/span> {<\/span>\r\n        \/\/ \u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5909\u6570\u306f\u30b9\u30ec\u30c3\u30c9\u30bb\u30fc\u30d5\u3067\u306a\u3044\u3002<\/span>\r\n        this<\/span>.<\/span>unsafeActionForm<\/span> =<\/span> safeActionForm<\/span>;<\/span>\r\n\r\n        \/\/ \u51e6\u7406<\/span>\r\n        executeLogic<\/span>();<\/span>\r\n    }<\/span>\r\n\r\n    public<\/span> void<\/span> executeLogic<\/span>()<\/span> {<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
ThreadUnsafeAction\u7c7b\u8986\u76d6\u4e86unsafeActionForm\u5bf9\u8c61\uff08\u5b9e\u4f8b\u53d8\u91cf\uff09\u7684\u6d88\u606f\u3002\u5728\u6e90\u4ee3\u7801\u4e2d\uff0c\u5728\u6761\u4ef6\u5206\u652f\u5904\u8fd4\u56defalse\uff0c\u4e0d\u8f93\u51fa\u9519\u8bef\u6d88\u606f\uff0c\u4f46\u6267\u884c\u793a\u4f8b\u4ee3\u7801\u65f6\uff0c\u9519\u8bef\u6d88\u606f\u4f1a\u88ab\u8f93\u51fa\u5230\u63a7\u5236\u53f0\u3002<\/p>\n
public<\/span> class<\/span> ThreadUnsafeAction<\/span> extends<\/span> CustomAction<\/span> {<\/span>\r\n\r\n    public<\/span> static<\/span> final<\/span> String<\/span> MESSAGE<\/span> =<\/span> \"\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u4e0a\u66f8\u3057\u307e\u3057\u305f\"<\/span>;<\/span>\r\n\r\n    @Override<\/span>\r\n    public<\/span> void<\/span> executeLogic<\/span>()<\/span> {<\/span>\r\n        unsafeActionForm<\/span>.<\/span>setMessage<\/span>(<\/span>MESSAGE<\/span>);<\/span>\r\n\r\n        String<\/span> message<\/span> =<\/span> unsafeActionForm<\/span>.<\/span>getMessage<\/span>();<\/span>\r\n        if<\/span> (!<\/span>MESSAGE<\/span>.<\/span>equals<\/span>(<\/span>message<\/span>))<\/span> {<\/span>\r\n            long<\/span> id<\/span> =<\/span> Thread<\/span>.<\/span>currentThread<\/span>().<\/span>getId<\/span>();<\/span>\r\n            System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>String<\/span>.<\/span>format<\/span>(<\/span>\r\n                    \"\u30a8\u30e9\u30fc: %4d, %s, %s, \u4e0a\u66f8\u304d\u306b\u5931\u6557\u3057\u307e\u3057\u305f\"<\/span>,<\/span>\r\n                    id<\/span>,<\/span> message<\/span>,<\/span> MESSAGE<\/span>\r\n            ));<\/span>\r\n        }<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
RequestProcessor\u7c7b\u751f\u6210ActionForm\u5bf9\u8c61\uff0c\u5c31\u50cfWeb\u5e94\u7528\u7a0b\u5e8f\u4e00\u6837\uff0c\u4e3a\u6bcf\u4e2a\u8bf7\u6c42\u3002<\/p>\n
public<\/span> class<\/span> RequestProcessor<\/span> implements<\/span> Runnable<\/span> {<\/span>\r\n\r\n    private<\/span> CountDownLatch<\/span> startLatch<\/span>;<\/span>\r\n    private<\/span> Action<\/span> action<\/span>;<\/span>\r\n    private<\/span> int<\/span> numberOfRequests<\/span>;<\/span>\r\n\r\n    public<\/span> RequestProcessor<\/span>(<\/span>CountDownLatch<\/span> startLatch<\/span>,<\/span> Action<\/span> action<\/span>,<\/span> int<\/span> numberOfRequests<\/span>)<\/span> {<\/span>\r\n        this<\/span>.<\/span>startLatch<\/span> =<\/span> startLatch<\/span>;<\/span>\r\n        this<\/span>.<\/span>action<\/span> =<\/span> action<\/span>;<\/span>\r\n        this<\/span>.<\/span>numberOfRequests<\/span> =<\/span> numberOfRequests<\/span>;<\/span>\r\n    }<\/span>\r\n\r\n    @Override<\/span>\r\n    public<\/span> void<\/span> run<\/span>()<\/span> {<\/span>\r\n        try<\/span> {<\/span>\r\n            startLatch<\/span>.<\/span>await<\/span>();<\/span>\r\n\r\n            for<\/span> (<\/span>int<\/span> i<\/span> =<\/span> 1<\/span>;<\/span> i<\/span> <=<\/span> numberOfRequests<\/span>;<\/span> i<\/span>++)<\/span> {<\/span>\r\n                ActionForm<\/span> actionForm<\/span> =<\/span> new<\/span> ActionForm<\/span>();<\/span>\r\n                actionForm<\/span>.<\/span>setMessage<\/span>(<\/span>\"\u30e1\u30c3\u30bb\u30fc\u30b8\u304c\u3042\u308a\u307e\u3059\"<\/span>);<\/span>\r\n                action<\/span>.<\/span>execute<\/span>(<\/span>actionForm<\/span>);<\/span>\r\n            }<\/span>\r\n        }<\/span> catch<\/span> (<\/span>InterruptedException<\/span> e<\/span>)<\/span> {<\/span>\r\n            e<\/span>.<\/span>printStackTrace<\/span>();<\/span>\r\n        }<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
Main#testThreadSafe\u65b9\u6cd5\u5728\u591a\u4e2a\u7ebf\u7a0b\u4e2d\u5171\u4eab\u4e00\u4e2aThreadUnsafeAction\u5bf9\u8c61\u3002<\/p>\n
public<\/span> class<\/span> Main<\/span> {<\/span>\r\n\r\n    \/\/ \u30b9\u30ec\u30c3\u30c9\u6570<\/span>\r\n    private<\/span> static<\/span> final<\/span> int<\/span> NUMBER_OF_THREADS<\/span> =<\/span> 100<\/span>;<\/span>\r\n    \/\/ \u30ea\u30af\u30a8\u30b9\u30c8\u6570<\/span>\r\n    private<\/span> static<\/span> final<\/span> int<\/span> NUMBER_OF_REQUESTS<\/span> =<\/span> 10<\/span>;<\/span>\r\n\r\n    public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[]<\/span> args<\/span>)<\/span> {<\/span>\r\n        testThreadSafe<\/span>(<\/span>new<\/span> ThreadUnsafeAction<\/span>());<\/span>\r\n    }<\/span>\r\n\r\n    public<\/span> static<\/span> void<\/span> testThreadSafe<\/span>(<\/span>Action<\/span> action<\/span>)<\/span> {<\/span>\r\n        String<\/span> className<\/span> =<\/span> action<\/span>.<\/span>getClass<\/span>().<\/span>getSimpleName<\/span>();<\/span>\r\n        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>className<\/span> +<\/span> \" start.\"<\/span>);<\/span>\r\n\r\n        CountDownLatch<\/span> startLatch<\/span> =<\/span> new<\/span> CountDownLatch<\/span>(<\/span>1<\/span>);<\/span>\r\n        Collection<\/span><<\/span>Thread<\/span>><\/span> threads<\/span> =<\/span> new<\/span> HashSet<\/span><>();<\/span>\r\n\r\n        \/\/ \u8907\u6570\u306e\u30b9\u30ec\u30c3\u30c9\u3067\u30a2\u30af\u30b7\u30e7\u30f3\u3092\u5171\u6709\u3059\u308b\u3002<\/span>\r\n        for<\/span> (<\/span>int<\/span> i<\/span> =<\/span> 0<\/span>;<\/span> i<\/span> <<\/span> NUMBER_OF_THREADS<\/span>;<\/span> i<\/span>++)<\/span> {<\/span>\r\n            Thread<\/span> thread<\/span> =<\/span> new<\/span> Thread<\/span>(<\/span>new<\/span> RequestProcessor<\/span>(<\/span>startLatch<\/span>,<\/span> action<\/span>,<\/span> NUMBER_OF_REQUESTS<\/span>));<\/span>\r\n            thread<\/span>.<\/span>start<\/span>();<\/span>\r\n            threads<\/span>.<\/span>add<\/span>(<\/span>thread<\/span>);<\/span>\r\n        }<\/span>\r\n\r\n        \/\/ \u540c\u6642\u306b\u30b9\u30ec\u30c3\u30c9\u3092\u5b9f\u884c\u3059\u308b\u3002<\/span>\r\n        startLatch<\/span>.<\/span>countDown<\/span>();<\/span>\r\n        try<\/span> {<\/span>\r\n            \/\/ \u30b9\u30ec\u30c3\u30c9\u304c\u7d42\u4e86\u3059\u308b\u306e\u3092\u5f85\u3064\u3002<\/span>\r\n            for<\/span> (<\/span>Thread<\/span> thread<\/span> :<\/span> threads<\/span>)<\/span> {<\/span>\r\n                thread<\/span>.<\/span>join<\/span>();<\/span>\r\n            }<\/span>\r\n        }<\/span> catch<\/span> (<\/span>InterruptedException<\/span> e<\/span>)<\/span> {<\/span>\r\n            e<\/span>.<\/span>printStackTrace<\/span>();<\/span>\r\n        }<\/span>\r\n\r\n        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>className<\/span> +<\/span> \" end.\"<\/span>);<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u5f53\u6267\u884cMain\uff03main\u65f6\uff0c\u6700\u7ec8\u4f1a\u5728\u63a7\u5236\u53f0\u4e0a\u8f93\u51fa\u591a\u4e2a\u9519\u8bef\u6d88\u606f\u3002\u5982\u679c\u6ca1\u6709\u663e\u793a\u4efb\u4f55\u9519\u8bef\u6d88\u606f\uff0c\u5219\u53ef\u4ee5\u589e\u52a0\u7ebf\u7a0b\u6570\u6216\u8bf7\u6c42\u6570\uff0c\u6216\u8005\u591a\u6b21\u6267\u884c\u4ee5\u8f93\u51fa\u9519\u8bef\u6d88\u606f\u3002<\/p>\n
ThreadUnsafeAction start.\r\n\u30a8\u30e9\u30fc:   36, \u30e1\u30c3\u30bb\u30fc\u30b8\u304c\u3042\u308a\u307e\u3059, \u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u4e0a\u66f8\u3057\u307e\u3057\u305f, \u4e0a\u66f8\u304d\u306b\u5931\u6557\u3057\u307e\u3057\u305f\r\n\u30a8\u30e9\u30fc:   96, \u30e1\u30c3\u30bb\u30fc\u30b8\u304c\u3042\u308a\u307e\u3059, \u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u4e0a\u66f8\u3057\u307e\u3057\u305f, \u4e0a\u66f8\u304d\u306b\u5931\u6557\u3057\u307e\u3057\u305f\r\n\u30a8\u30e9\u30fc:  105, \u30e1\u30c3\u30bb\u30fc\u30b8\u304c\u3042\u308a\u307e\u3059, \u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u4e0a\u66f8\u3057\u307e\u3057\u305f, \u4e0a\u66f8\u304d\u306b\u5931\u6557\u3057\u307e\u3057\u305f\r\n\u30a8\u30e9\u30fc:   44, \u30e1\u30c3\u30bb\u30fc\u30b8\u304c\u3042\u308a\u307e\u3059, \u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u4e0a\u66f8\u3057\u307e\u3057\u305f, \u4e0a\u66f8\u304d\u306b\u5931\u6557\u3057\u307e\u3057\u305f\r\n\u30a8\u30e9\u30fc:   31, \u30e1\u30c3\u30bb\u30fc\u30b8\u304c\u3042\u308a\u307e\u3059, \u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u4e0a\u66f8\u3057\u307e\u3057\u305f, \u4e0a\u66f8\u304d\u306b\u5931\u6557\u3057\u307e\u3057\u305f\r\n\u30a8\u30e9\u30fc:   68, \u30e1\u30c3\u30bb\u30fc\u30b8\u304c\u3042\u308a\u307e\u3059, \u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u4e0a\u66f8\u3057\u307e\u3057\u305f, \u4e0a\u66f8\u304d\u306b\u5931\u6557\u3057\u307e\u3057\u305f\r\n\u30a8\u30e9\u30fc:   52, \u30e1\u30c3\u30bb\u30fc\u30b8\u304c\u3042\u308a\u307e\u3059, \u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u4e0a\u66f8\u3057\u307e\u3057\u305f, \u4e0a\u66f8\u304d\u306b\u5931\u6557\u3057\u307e\u3057\u305f\r\n\u30a8\u30e9\u30fc:   27, \u30e1\u30c3\u30bb\u30fc\u30b8\u304c\u3042\u308a\u307e\u3059, \u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u4e0a\u66f8\u3057\u307e\u3057\u305f, \u4e0a\u66f8\u304d\u306b\u5931\u6557\u3057\u307e\u3057\u305f\r\n\u30a8\u30e9\u30fc:   22, \u30e1\u30c3\u30bb\u30fc\u30b8\u304c\u3042\u308a\u307e\u3059, \u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u4e0a\u66f8\u3057\u307e\u3057\u305f, \u4e0a\u66f8\u304d\u306b\u5931\u6557\u3057\u307e\u3057\u305f\r\n\u30a8\u30e9\u30fc:  100, \u30e1\u30c3\u30bb\u30fc\u30b8\u304c\u3042\u308a\u307e\u3059, \u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u4e0a\u66f8\u3057\u307e\u3057\u305f, \u4e0a\u66f8\u304d\u306b\u5931\u6557\u3057\u307e\u3057\u305f\r\n\u30a8\u30e9\u30fc:   81, \u30e1\u30c3\u30bb\u30fc\u30b8\u304c\u3042\u308a\u307e\u3059, \u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u4e0a\u66f8\u3057\u307e\u3057\u305f, \u4e0a\u66f8\u304d\u306b\u5931\u6557\u3057\u307e\u3057\u305f\r\n\u30a8\u30e9\u30fc:   47, \u30e1\u30c3\u30bb\u30fc\u30b8\u304c\u3042\u308a\u307e\u3059, \u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u4e0a\u66f8\u3057\u307e\u3057\u305f, \u4e0a\u66f8\u304d\u306b\u5931\u6557\u3057\u307e\u3057\u305f\r\n\u30a8\u30e9\u30fc:   45, \u30e1\u30c3\u30bb\u30fc\u30b8\u304c\u3042\u308a\u307e\u3059, \u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u4e0a\u66f8\u3057\u307e\u3057\u305f, \u4e0a\u66f8\u304d\u306b\u5931\u6557\u3057\u307e\u3057\u305f\r\n\u30a8\u30e9\u30fc:  102, \u30e1\u30c3\u30bb\u30fc\u30b8\u304c\u3042\u308a\u307e\u3059, \u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u4e0a\u66f8\u3057\u307e\u3057\u305f, \u4e0a\u66f8\u304d\u306b\u5931\u6557\u3057\u307e\u3057\u305f\r\nThreadUnsafeAction end.\r\n<\/code><\/pre>\n
\u7ebf\u7a0b\u5b89\u5168\u7684\u64cd\u4f5c<\/h2>\n
\u5728\u8bbf\u95ee\u5806\u533a\u6570\u636e\u65f6\uff0c\u4f1a\u5229\u7528\u7f13\u5b58\u533a\u57df\u3002\u5f53\u4e00\u4e2a\u7ebf\u7a0b\u66f4\u65b0\u4e86\u5806\u533a\u6570\u636e\u65f6\uff0c\u5b9e\u9645\u4e0a\u53ea\u662f\u66f4\u65b0\u4e86\u7f13\u5b58\u533a\u57df\uff0c\u5176\u4ed6\u7ebf\u7a0b\u53ef\u80fd\u4ecd\u5728\u5f15\u7528\u66f4\u65b0\u524d\u7684\u65e7\u6570\u636e\u3002\u5728\u67d0\u4e2a\u65f6\u673a\uff0c\u7f13\u5b58\u533a\u57df\u4f1a\u4e0e\u5806\u533a\u8fdb\u884c\u540c\u6b65\uff0c\u4ee5\u8fbe\u5230\u6700\u65b0\u72b6\u6001\u3002\u7531\u4e8e\u5b58\u5728\u7f13\u5b58\u533a\u57df\uff0c\u5171\u4eab\u6570\u636e\u5728\u7ebf\u7a0b\u95f4\u65e0\u6cd5\u4fdd\u8bc1\u5b89\u5168\u6027\u3002<\/p>\n
\u4e3a\u4e86\u4f7f\u4e0d\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\u64cd\u4f5c\u53d8\u5f97\u7ebf\u7a0b\u5b89\u5168\uff0c\u53ef\u4ee5\u4f7f\u7528ThreadLocal\u7c7b\u3002ThreadLocal\u7c7b\u53ef\u4ee5\u4fdd\u5b58\u6bcf\u4e2a\u7ebf\u7a0b\u7684\u4e0d\u540c\u6570\u636e\u3002\u7531\u4e8e\u5176\u4ed6\u7ebf\u7a0b\u65e0\u6cd5\u8bbf\u95ee\u67d0\u4e2a\u7ebf\u7a0b\u6240\u6301\u6709\u7684\u6570\u636e\uff0c\u56e0\u6b64\u53ef\u4ee5\u5b9e\u73b0\u7ebf\u7a0b\u5b89\u5168\u3002<\/p>\n
ActionFormContext\u7c7b\u4f1a\u4e3a\u6bcf\u4e2a\u7ebf\u7a0b\u4fdd\u5b58\u4e00\u4e2aActionForm\u5bf9\u8c61\u3002<\/p>\n
public<\/span> class<\/span> ActionFormContext<\/span> {<\/span>\r\n\r\n    private<\/span> static<\/span> ThreadLocal<\/span><<\/span>ActionForm<\/span>><\/span> actionFormThreadLocal<\/span> =<\/span> new<\/span> ThreadLocal<\/span><>();<\/span>\r\n\r\n    public<\/span> static<\/span> ActionForm<\/span> getActionFrom<\/span>()<\/span> {<\/span>\r\n        return<\/span> actionFormThreadLocal<\/span>.<\/span>get<\/span>();<\/span>\r\n    }<\/span>\r\n\r\n    public<\/span> static<\/span> void<\/span> setActionFrom<\/span>(<\/span>ActionForm<\/span> actionForm<\/span>)<\/span> {<\/span>\r\n        actionFormThreadLocal<\/span>.<\/span>set<\/span>(<\/span>actionForm<\/span>);<\/span>\r\n    }<\/span>\r\n\r\n    public<\/span> static<\/span> void<\/span> removeActionFrom<\/span>()<\/span> {<\/span>\r\n        actionFormThreadLocal<\/span>.<\/span>remove<\/span>();<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
CustomAction\u7c7b\u5c06ActionForm\u5bf9\u8c61\u5b58\u50a8\u5728ActionFormContext\u7c7b\u4e2d\uff0c\u5e76\u5728\u8c03\u7528ActionFormContext#removeActionForm\u65b9\u6cd5\u4e4b\u524d\u4e00\u76f4\u4fdd\u6301\u8be5\u5bf9\u8c61\u3002<\/p>\n
public<\/span> class<\/span> CustomAction<\/span> extends<\/span> Action<\/span> {<\/span>\r\n\r\n    @Override<\/span>\r\n    public<\/span> void<\/span> execute<\/span>(<\/span>ActionForm<\/span> safeActionForm<\/span>)<\/span> {<\/span>\r\n        try<\/span> {<\/span>\r\n            \/\/ \u30b9\u30ec\u30c3\u30c9\u30ed\u30fc\u30ab\u30eb\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u30b9\u30ec\u30c3\u30c9\u30bb\u30fc\u30d5\u3092\u5b9f\u73fe\u3002<\/span>\r\n            ActionFormContext<\/span>.<\/span>setActionForm<\/span>(<\/span>safeActionForm<\/span>);<\/span>\r\n\r\n            \/\/ \u51e6\u7406<\/span>\r\n            executeLogic<\/span>();<\/span>\r\n\r\n        }<\/span> finally<\/span> {<\/span>\r\n            \/\/ \u30b9\u30ec\u30c3\u30c9\u30ed\u30fc\u30ab\u30eb\u3067\u78ba\u4fdd\u3057\u305f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u30b9\u30ec\u30c3\u30c9\u7d42\u4e86\u6642\u306b\u7834\u68c4\u3055\u308c\u308b\u304c\u3001<\/span>\r\n            \/\/ Web \u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u3088\u3046\u306b\u30b9\u30ec\u30c3\u30c9\u3092\u5171\u6709\u3059\u308b\u5834\u5408\u306f\u3001<\/span>\r\n            \/\/ \u30e1\u30e2\u30ea\u30ea\u30fc\u30af\u304c\u8d77\u304d\u306a\u3044\u3088\u3046\u306b\u660e\u793a\u7684\u306b\u958b\u653e\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u3002<\/span>\r\n            ActionFormContext<\/span>.<\/span>removeActionForm<\/span>();<\/span>\r\n        }<\/span>\r\n    }<\/span>\r\n\r\n    public<\/span> void<\/span> executeLogic<\/span>()<\/span> {<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
ThreadSafeAction\u7c7b\u4eceActionFormContext\u7c7b\u4e2d\u83b7\u53d6ActionForm\u5bf9\u8c61\u3002ActionFormContext\u7c7b\u4f1a\u4e3a\u6bcf\u4e2a\u7ebf\u7a0b\u8fd4\u56de\u4e0d\u540c\u7684ActionForm\u5bf9\u8c61\u3002<\/p>\n
public<\/span> class<\/span> ThreadSafeAction<\/span> extends<\/span> CustomAction<\/span> {<\/span>\r\n\r\n    public<\/span> static<\/span> final<\/span> String<\/span> MESSAGE<\/span> =<\/span> \"\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u4e0a\u66f8\u3057\u307e\u3057\u305f\"<\/span>;<\/span>\r\n\r\n    @Override<\/span>\r\n    public<\/span> void<\/span> executeLogic<\/span>()<\/span> {<\/span>\r\n        ActionForm<\/span> safeActionForm<\/span> =<\/span> ActionFormContext<\/span>.<\/span>getActionFrom<\/span>();<\/span>\r\n        safeActionForm<\/span>.<\/span>setMessage<\/span>(<\/span>MESSAGE<\/span>);<\/span>\r\n\r\n        String<\/span> message<\/span> =<\/span> safeActionForm<\/span>.<\/span>getMessage<\/span>();<\/span>\r\n        if<\/span> (!<\/span>MESSAGE<\/span>.<\/span>equals<\/span>(<\/span>message<\/span>))<\/span> {<\/span>\r\n            long<\/span> id<\/span> =<\/span> Thread<\/span>.<\/span>currentThread<\/span>().<\/span>getId<\/span>();<\/span>\r\n            System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>String<\/span>.<\/span>format<\/span>(<\/span>\r\n                    \"\u30a8\u30e9\u30fc: %4d, %s, %s, \u4e0a\u66f8\u304d\u306b\u5931\u6557\u3057\u307e\u3057\u305f\"<\/span>,<\/span>\r\n                    id<\/span>,<\/span> message<\/span>,<\/span> MESSAGE<\/span>\r\n            ));<\/span>\r\n        }<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u5c06Main\u7c7b\u4e2d\u7684ThreadUnsafeAction\u7c7b\u66ff\u6362\u4e3aThreadSafe\u7c7b\uff0c\u5e76\u6267\u884cMain#main\uff0c\u6b64\u65f6\u63a7\u5236\u53f0\u5c06\u4e0d\u518d\u8f93\u51fa\u9519\u8bef\u3002<\/p>\n
ThreadSafeAction start.\r\nThreadSafeAction end.\r\n<\/code><\/pre>\n
\u603b\u7ed3<\/h2>\n
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