{"id":107,"date":"2016-04-20T10:47:20","date_gmt":"2016-04-20T02:47:20","guid":{"rendered":"http:\/\/zsaber.com\/blog\/?p=107"},"modified":"2019-08-26T15:44:29","modified_gmt":"2019-08-26T07:44:29","slug":"java-%e4%b8%8e-jni-%e4%ba%92%e4%bc%a0%e6%95%b0%e6%8d%ae%e7%9a%84%e9%82%a3%e4%ba%9b%e4%ba%8b","status":"publish","type":"post","link":"http:\/\/zsaber.com\/blog\/p\/107","title":{"rendered":"Java \u4e0e JNI \u4e92\u4f20\u6570\u636e\u7684\u90a3\u4e9b\u4e8b"},"content":{"rendered":"<h1>\u5e38\u89c4\u7c7b\u578b\u7684\u4f20\u9012<\/h1>\n<p>\u8fd9\u90e8\u5206\u7b97\u662f JNI \u7684\u57fa\u672c\u5185\u5bb9, \u7406\u6240\u5f53\u7136\u7684\u6709\u4e00\u5927\u5768\u63a5\u53e3\u6765\u5e72\u8fd9\u4e9b\u4e8b\u60c5,<br \/>\n\u6bd4\u5982 <code>NewString<\/code>, <code>GetStringChars<\/code>, <code>GetArrayLength<\/code>, <code>NewByteArray<\/code><\/p>\n<p>\u5230 Java \u5c42\u81ea\u7136\u5c31\u662f\u539f\u751f\u7684\u6570\u636e\u7c7b\u578b\u4e86, \u6bd4\u5982 <code>String<\/code>, <code>int<\/code>, <code>byte[]<\/code><\/p>\n<p>\u9700\u8981\u6ce8\u610f\u7684\u53ea\u662f, \u6709\u7684\u7c7b\u578b\u4e0d\u9700\u8981\u91ca\u653e, \u6709\u7684\u7c7b\u578b\u5219\u9700\u8981, \u4f8b\u5982\u5bf9\u8c61\u53ef\u80fd\u9700\u8981 <code>DeleteLocalRef<\/code> \u6216 <code>DeleteGlobalRef<\/code>,<br \/>\n\u8bbf\u95ee\u6570\u7ec4\u5185\u5bb9\u4e00\u822c\u9700\u8981 <code>ReleaseByteArrayElements<\/code><\/p>\n<h1>Java \u5bf9\u8c61\u7684\u5185\u5b58\u7ba1\u7406<\/h1>\n<p>Java \u4f7f\u7528\u7c7b\u4f3c\u5f15\u7528\u8ba1\u6570\u7684\u65b9\u5f0f\u7ba1\u7406\u5185\u5b58, \u5e76\u4e14\u4e0d\u5b9a\u671f GC, \u6240\u4ee5 JNI \u8bbf\u95ee Java \u5bf9\u8c61\u8fd8\u9700\u8981\u7279\u522b\u6ce8\u610f<\/p>\n<h2>\u4e34\u65f6\u5bf9\u8c61<\/h2>\n<p>\u5927\u591a\u6570\u60c5\u51b5\u6765\u8bf4, \u8bbf\u95ee\u65b9\u5f0f\u4e00\u822c\u90fd\u662f JNI \u8c03\u7528 Java \u63a5\u53e3, \u8fd4\u56de\u4e00\u4e2a Java \u7684\u4e34\u65f6\u5bf9\u8c61, \u4f8b\u5982:<\/p>\n<pre><code>\/\/ Java\npublic Object func() {...}\n\n\/\/ JNI\njobject obj = env-&gt;CallObjectMethod(...);<\/code><\/pre>\n<p>\u8fd9\u79cd\u60c5\u51b5\u4e00\u822c\u4e0d\u540c\u62c5\u5fc3, JNI \u7aef\u4ee3\u7801\u7ed3\u675f\u540e, \u4e00\u822c\u4f1a\u5728\u5408\u9002\u65f6\u673a GC<\/p>\n<p>\u5f53\u7136, \u7279\u6b8a\u60c5\u51b5\u662f, \u5047\u5982 JNI \u7aef\u9700\u8981\u6301\u7eed\u6267\u884c\u8f83\u957f\u65f6\u95f4, \u5e76\u4e14\u53ef\u80fd\u8bbf\u95ee\u4e86\u8f83\u591a\u7684 Java \u7aef\u5bf9\u8c61,<br \/>\n\u5c31\u9700\u8981\u624b\u52a8\u8c03\u7528 <code>DeleteLocalRef<\/code> \u91ca\u653e\u8fd9\u4e9b\u4e34\u65f6\u5bf9\u8c61, \u907f\u514d\u6027\u80fd\u95ee\u9898, \u6b64\u5916, JNI \u7aef local \u5bf9\u8c61\u4e2a\u6570\u4e5f\u662f\u6709\u9650\u5236\u7684<\/p>\n<p>\u540c\u7406\u7684\u8fd8\u6709 <code>NewString<\/code> \u7b49 JNI \u63a5\u53e3, \u521b\u5efa\u7684\u90fd\u662f\u4e34\u65f6\u5bf9\u8c61<\/p>\n<h2>\u5168\u5c40\u5bf9\u8c61<\/h2>\n<p>\u4e0a\u9762\u63d0\u5230\u4e86, \u4e34\u65f6\u5bf9\u8c61\u4f1a\u5728\u4e0d\u786e\u5b9a\u65f6\u673a\u88ab GC, \u6240\u4ee5\u5982\u679c\u4f60\u8981\u957f\u671f\u4f7f\u7528\u8fd9\u4e2a\u5bf9\u8c61, \u7b80\u5355\u7684\u4fdd\u5b58 jobject \u662f\u4e0d\u884c\u7684<\/p>\n<p>\u6b63\u786e\u7684\u505a\u6cd5\u662f, \u4f7f\u7528 <code>NewGlobalRef<\/code> \u6765\u521b\u5efa\u4e00\u4e2a\u5168\u5c40\u5f15\u7528, \u8fd9\u4e2a\u5f15\u7528\u4f1a\u4e00\u76f4\u5b58\u5728, \u4e0d\u4f1a\u88ab GC, \u76f4\u5230\u4f60\u8c03\u7528 <code>DeleteGlobalRef<\/code><\/p>\n<p>\u8fd9\u8fb9\u9700\u8981\u6ce8\u610f\u7684\u662f, <code>NewGlobalRef<\/code> \u867d\u7136\u662f\u64cd\u4f5c\u540c\u4e00\u4e2a\u5bf9\u8c61, \u4f46\u662f jobject \u672c\u8eab\u662f\u4e0d\u4e00\u6837\u7684, \u5178\u578b\u7684\u4f7f\u7528\u65b9\u6cd5\u662f:<\/p>\n<pre><code class=\"language-cpp\">jobject localRef = xxx;\njobject globalRef = env-&gt;NewGlobalRef(localRef);\nenv-&gt;DeleteLocalRef(localRef);<\/code><\/pre>\n<h1>\u7279\u6b8a\u7c7b\u578b\u7684\u4f20\u9012<\/h1>\n<p>\u5bf9\u8c61\u548c\u57fa\u7840\u7c7b\u578b\u7684\u4f20\u9012\u4e00\u822c\u90fd\u6ca1\u4ec0\u4e48\u95ee\u9898, \u9ebb\u70e6\u4e8b\u5728\u4e8e\u4e00\u5927\u6bb5\u5185\u5b58\u5757\u7684\u4f20\u9012<\/p>\n<h2>\u6307\u9488\u4f20\u9012<\/h2>\n<p>\u8fd9\u662f\u6bd4\u8f83\u5e38\u89c1\u4e5f\u6bd4\u8f83\u5bb9\u6613\u5b9e\u73b0\u7684\u65b9\u5f0f, \u5178\u578b\u4f7f\u7528\u573a\u666f\u662f, \u5185\u5b58\u5757\u7684\u7533\u8bf7\/\u4f7f\u7528\/\u91ca\u653e (\u4e5f\u53ef\u4ee5\u662f C++ \u5bf9\u8c61), \u90fd\u5728 JNI \u7aef\u5904\u7406, Java \u7aef\u53ea\u8d1f\u8d23\u8c03\u7528\u548c\u8fd9\u4e2a\u6307\u9488\u7684\u4f20\u9012<\/p>\n<p>\u5f88\u5e38\u89c4\u7684\u505a\u6cd5\u5c31\u662f\u628a\u6307\u9488\u8f6c\u6362\u4e3a <code>jlong<\/code> \u8fdb\u884c\u4f20\u9012\u5373\u53ef<\/p>\n<p>PS:<\/p>\n<ul>\n<li>\u6709\u70b9\u62c5\u5fc3\u54ea\u5929\u5347\u7ea7 128 \u4f4d CPU \u4e86\u548b\u529e, \u4e0d\u8fc7\u76ee\u524d\u5927\u591a JNI \u90fd\u662f\u8fd9\u79cd\u5904\u7406\u65b9\u5f0f, \u5e94\u8be5\u672a\u6765\u4f1a\u6709\u53d8\u901a\u65b9\u5f0f\u89e3\u51b3\u5427<\/li>\n<li>\u66f4\u4fdd\u9669\u8d77\u89c1\u7684\u65b9\u5f0f\u662f\u5c06\u6307\u9488\u8f6c\u6362\u4e3a <code>byte[]<\/code> \u8fdb\u884c\u4f20\u9012, \u4e0d\u8fc7\u9ebb\u70e6\u800c\u4e14\u6027\u80fd\u4f1a\u53d7\u5f71\u54cd<\/li>\n<\/ul>\n<h2>\u5185\u5b58\u5757\u7684\u4f20\u9012<\/h2>\n<p>\u5178\u578b\u4f7f\u7528\u573a\u666f:<\/p>\n<p>Java \u8bfb\u53d6\u56fe\u7247\u6216\u97f3\u9891\u4ec0\u4e48\u7684, \u628a\u5185\u5bb9\u4f5c\u4e3a\u5185\u5b58\u5757\u4ea4\u7ed9 JNI \u5904\u7406, JNI \u5904\u7406\u5b8c\u540e, \u628a\u65b0\u7684\u5185\u5b58\u5757\u5185\u5bb9\u8fd4\u56de\u7ed9 Java \u7aef\u518d\u91cd\u65b0\u89e3\u6790\u4e3a\u56fe\u7247\u6216\u97f3\u9891\u4ec0\u4e48\u7684<\/p>\n<p>(\u8fd9\u91cc\u59d1\u4e14\u4e0d\u8bba\u4f7f\u7528\u4e34\u65f6\u6587\u4ef6\u505a\u4e2d\u8f6c\u7684\u65b9\u5f0f, \u4f55\u51b5\u5199\u6587\u4ef6\u4e5f\u633a\u6162\u7684\u5462)<\/p>\n<p>\u8fd9\u4e2a\u53ef\u8c13\u9ebb\u70e6\u81f3\u6781, \u9996\u5148, \u901a\u5e38\u90fd\u4f1a\u60f3\u5230\u7528 <code>byte[]<\/code> \u4f20\u9012,<br \/>\n\u7136\u800c\u8fd9\u8d27\u65e0\u8bba\u662f Java \u4f20\u5230 JNI \u8fd8\u662f JNI \u4f20\u5230 Java, \u90fd (\u53ef\u80fd\u4f46\u4e0d\u4e00\u5b9a) \u9700\u8981\u8fdb\u884c\u6df1\u62f7\u8d1d,<br \/>\n\u5bf9\u4e8e\u5206\u5206\u949f\u4e0a\u5146\u7684\u5a92\u4f53\u6587\u4ef6\u6765\u8bf4, \u662f\u4e2a\u5de8\u5927\u7684 CPU \u548c\u5185\u5b58\u5f00\u9500<\/p>\n<p>\u627e\u904d\u6587\u6863, \u907f\u514d\u6df1\u62f7\u8d1d\u7684\u65b9\u6cd5\u5927\u6982\u6709<\/p>\n<h3>GetPrimitiveArrayCritical<\/h3>\n<p>\u770b\u4e0a\u53bb\u597d\u50cf\u90a3\u4e48\u4e00\u56de\u4e8b, \u5199\u4e2a\u7b80\u5355\u7684\u6d4b\u8bd5\u4ee3\u7801\u53d1\u73b0\u53ef\u4ee5\u7528, \u7686\u5927\u6b22\u559c\u4e86?<\/p>\n<p>\u56fe\u6837\u56fe\u68ee\u7834, \u5f53\u4f60\u5c1d\u8bd5\u5728 GetPrimitiveArrayCritical \u548c ReleasePrimitiveArrayCritical \u4e4b\u95f4<br \/>\n\u518d\u8c03\u7528 Java \u4ee3\u7801\u65f6, \u5c31\u4f1a\u53d1\u73b0\u6302\u4e86<\/p>\n<p>\u987e\u540d\u601d\u4e49, \u8fd9\u8d27\u662f\u76f4\u63a5\u8bbf\u95ee Java \u7684\u5e95\u5c42\u6570\u636e\u5185\u5bb9, \u5bf9\u4e8e Java \u8fd9\u79cd\u4e0d\u77e5\u4f55\u65f6\u4f1a GC \u7684\u8fd0\u884c\u65f6\u6765\u8bf4,<br \/>\nJava \u663e\u7136\u4e0d\u4f1a\u8ba9\u4f60\u778e\u641e, \u8bd5\u60f3\u4ee5\u4e0b\u6d41\u7a0b:<\/p>\n<ol>\n<li>GetPrimitiveArrayCritical \u5f97\u5230\u5e95\u5c42\u6570\u636e\u6307\u9488<\/li>\n<li>JNI \u7aef\u8c03\u7528 Java \u4ee3\u7801, \u5f88\u53ef\u80fd\u4ea7\u751f GC<\/li>\n<li>\u5e95\u5c42\u6570\u636e\u6307\u9488\u6240\u5c5e\u7684 Java \u5bf9\u8c61\u88ab GC \u4e86, \u8fd9\u4e2a\u6307\u9488\u81ea\u7136\u4e5f\u5c31\u65e0\u6548\u4e86<\/li>\n<\/ol>\n<p>\u6240\u4ee5, \u8fd9\u4e2a\u53ea\u9002\u5408\u7528\u4e8e\u53ea\u8bfb\u800c\u4e14\u903b\u8f91\u7b80\u5355\u7684\u573a\u666f, \u5c31\u50cf\u591a\u7ebf\u7a0b\u7f16\u7a0b\u901a\u5e38\u4e0d\u63a8\u8350\u5728\u88ab\u9501\u7684\u4ee3\u7801\u5757\u91cc\u9762\u505a\u592a\u591a\u4e8b\u60c5\u4e00\u6837<br \/>\n(\u5426\u5219\u53ef\u80fd\u4e00\u4e0d\u5c0f\u5fc3\u5c31\u6b7b\u9501\u4e86)<\/p>\n<h3>ByteBuffer<\/h3>\n<p>\u4ed4\u7ec6\u67e5\u627e\u6587\u6863\u53ef\u4ee5\u53d1\u73b0 <code>NewDirectByteBuffer<\/code> \u8fd9\u4e48\u4e2a\u4e1c\u4e1c, \u5bf9\u5e94\u7684\u662f Java \u7aef\u7684 <code>java.nio.ByteBuffer<\/code><\/p>\n<p>\u6709\u4e86 ByteBuffer, JNI \u7aef\u5c31\u53ef\u4ee5\u901a\u8fc7 <code>GetDirectBufferAddress<\/code> \u83b7\u5f97\u5185\u5b58\u5730\u5740, \u5b8c\u7f8e\u4e86&#8230; \u5417?<\/p>\n<p>\u56fe\u6837\u56fe\u68ee\u7834, \u8fd9\u8d27\u4f9d\u7136\u6709\u7740\u9ebb\u70e6\u7684\u4f7f\u7528\u6761\u4ef6:<\/p>\n<ul>\n<li>\n<p>\u867d\u7136\u90fd\u53eb <code>ByteBuffer<\/code>, \u4f46\u662f\u8fd9\u4e2a\u53ea\u80fd\u4f7f\u7528 <code>NewDirectByteBuffer<\/code> \u6216\u8005 <code>ByteBuffer.allocateDirect()<\/code> \u8fdb\u884c\u521b\u5efa,<br \/>\n\u5426\u5219 <code>GetDirectBufferAddress<\/code> \u8fd4\u56de\u7684\u603b\u662f NULL<\/p>\n<p>\u4e0d\u652f\u6301\u7684\u51e0\u4e2a: <code>ByteBuffer.allocate()<\/code>, <code>ByteBuffer.wrap()<\/code><\/p>\n<p>\u66f4\u5177\u4f53\u7684\u539f\u56e0, \u5404\u4f4d\u6709\u5174\u8da3\u53ef\u4ee5\u53bb\u641c\u641c <code>DirectByteBuffer<\/code> \u548c <code>HeapByteBuffer<\/code><\/p>\n<\/li>\n<li>\n<p>JNI \u8fd9\u9b42\u6de1\u6ca1\u6709\u63d0\u4f9b\u8db3\u591f\u7684\u65b9\u6cd5\u53bb\u64cd\u4f5c ByteBuffer \u7684\u65b9\u6cd5<\/p>\n<p>\u6bd4\u5982 <code>position()<\/code>, <code>remaining()<\/code>, <code>flip()<\/code> \u90fd\u6ca1\u6709, \u800c\u53ea\u6709 <code>GetDirectBufferCapacity<\/code> \u6765\u83b7\u53d6\u6700\u5927\u5bb9\u91cf,<br \/>\n\u6240\u4ee5\u4f60\u8fd8\u5f97\u81ea\u884c\u6dfb\u52a0\u4e00\u5927\u5768\u5185\u5bb9, \u6765\u5728 JNI \u8c03\u7528\u8fd9\u4e9b\u65b9\u6cd5<\/p>\n<\/li>\n<\/ul>\n<p>\u4e0d\u7ba1\u600e\u6837, \u6700\u7ec8\u6211\u4eec\u53ef\u4ee5\u7528 ByteBuffer \u6765\u5f00\u5fc3\u7684\u73a9\u800d\u4e86, \u7136\u800c\u8fd9\u8d27\u672c\u8eab\u4f5c\u4e3a\u4e00\u4e2a\u6bd4\u8f83\u5e95\u5c42\u7684 buffer, \u63d0\u4f9b\u7684\u529f\u80fd\u633a\u5c11,<br \/>\n\u4e8e\u662f\u53c8\u5f97\u81ea\u5df1\u7ba1\u7406\u5185\u5b58\u589e\u957f\u4e4b\u7c7b\u7684\u903b\u8f91\u4e86, \u600e\u6837, \u6709\u6ca1\u6709\u4e00\u79cd\u56de\u5230 C \u8bed\u8a00\u7684\u7f8e\u597d\u611f\u89c9\u4e86?<\/p>\n<p>over<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5e38\u89c4\u7c7b\u578b\u7684\u4f20\u9012 \u8fd9\u90e8\u5206\u7b97\u662f JNI \u7684\u57fa\u672c\u5185\u5bb9, \u7406\u6240\u5f53\u7136\u7684\u6709\u4e00\u5927\u5768\u63a5\u53e3\u6765\u5e72\u8fd9\u4e9b\u4e8b\u60c5, \u6bd4\u5982 NewStrin\u2026 <span class=\"read-more\"><a href=\"http:\/\/zsaber.com\/blog\/p\/107\">Read More &raquo;<\/a><\/span><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6,16],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Java \u4e0e JNI \u4e92\u4f20\u6570\u636e\u7684\u90a3\u4e9b\u4e8b - \u67d0Z\u7684\u535a\u5ba2<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"http:\/\/zsaber.com\/blog\/p\/107\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Java \u4e0e JNI \u4e92\u4f20\u6570\u636e\u7684\u90a3\u4e9b\u4e8b - \u67d0Z\u7684\u535a\u5ba2\" \/>\n<meta property=\"og:description\" content=\"\u5e38\u89c4\u7c7b\u578b\u7684\u4f20\u9012 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