{"id":127394,"date":"2024-03-25T02:20:42","date_gmt":"2024-03-24T17:20:42","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%82%a4%e3%83%b3%e3%82%bf%e3%83%95%e3%82%a7%e3%83%bc%e3%82%b9%e3%81%ae%e5%91%bc%e3%81%b3%e5%87%ba%e3%81%97%e3%81%a7qt%e3%81%8b%e3%82%89%e3%83%87%e3%83%bc%e3%82%bf%e3%82%92%e5%8f%96%e5%be%97\/"},"modified":"2024-04-05T14:26:02","modified_gmt":"2024-04-05T05:26:02","slug":"java%e3%82%a4%e3%83%b3%e3%82%bf%e3%83%95%e3%82%a7%e3%83%bc%e3%82%b9%e3%81%ae%e5%91%bc%e3%81%b3%e5%87%ba%e3%81%97%e3%81%a7qt%e3%81%8b%e3%82%89%e3%83%87%e3%83%bc%e3%82%bf%e3%82%92%e5%8f%96%e5%be%97","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%82%a4%e3%83%b3%e3%82%bf%e3%83%95%e3%82%a7%e3%83%bc%e3%82%b9%e3%81%ae%e5%91%bc%e3%81%b3%e5%87%ba%e3%81%97%e3%81%a7qt%e3%81%8b%e3%82%89%e3%83%87%e3%83%bc%e3%82%bf%e3%82%92%e5%8f%96%e5%be%97\/","title":{"rendered":"java\u30a4\u30f3\u30bf\u30d5\u30a7\u30fc\u30b9\u306e\u547c\u3073\u51fa\u3057\u3067Qt\u304b\u3089\u30c7\u30fc\u30bf\u3092\u53d6\u5f97\u3059\u308b\u65b9\u6cd5"},"content":{"rendered":"<p>Qt\u3067Java\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u547c\u3073\u51fa\u3059\u306b\u306f\u3001Qt\u306eJava Native Interface\uff08JNI\uff09\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n<p>Qt\u3067Java\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u3092\u547c\u3073\u51fa\u3057\u3001\u30c7\u30fc\u30bf\u3092\u53d6\u5f97\u3059\u308b\u65b9\u6cd5\u3092\u793a\u3059\u7c21\u5358\u306a\u30b5\u30f3\u30d7\u30eb\u3092\u4ee5\u4e0b\u306b\u793a\u3057\u307e\u3059\u3002<\/p>\n<ol>\n<li>Java\u30a4\u30f3\u30bf\u30d5\u30a7\u30fc\u30b9\u30d5\u30a1\u30a4\u30eb\u3092\u4f5c\u6210\u3059\u308b\uff08\u4f8b\uff1aMyInterface.java\uff09\u306b\u306f\u3001\u30c7\u30fc\u30bf\u306e\u53d7\u3051\u6e21\u3057\u306b\u4f7f\u7528\u3055\u308c\u308b\u30e1\u30bd\u30c3\u30c9\u3092\u5b9a\u7fa9\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">interface<\/span> <span class=\"hljs-title class_\">MyInterface<\/span> {\r\n<span class=\"hljs-keyword\">public<\/span> String <span class=\"hljs-title function_\">getData<\/span><span class=\"hljs-params\">()<\/span>;\r\n}\r\n<\/code><\/pre>\n<ol>\n<li>Java\u30bd\u30fc\u30b9\u30d5\u30a1\u30a4\u30eb\u3092\u30b3\u30f3\u30d1\u30a4\u30eb\u3057\u3066\u5bfe\u5fdc\u3059\u308b.class\u30d5\u30a1\u30a4\u30eb\u3092\u751f\u6210\u3057\u307e\u3059\u3002<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code>javac MyInterface.java\r\n<\/code><\/pre>\n<ol>\n<li>\u30a4\u30f3\u30c9\u30cd\u30b7\u30a2\u8a9e\u3067\u300c\u3053\u308c\u306f\u79c1\u306e\u8eca\u3060\u300d\u3068\u8a00\u3046\u3002<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code>javah -jni MyInterface\r\n<\/code><\/pre>\n<ol>\n<li>Qt\u306b\u3066Java\u30a4\u30f3\u30bf\u30d5\u30a7\u30fc\u30b9\u3092\u547c\u3073\u51fa\u3059\u305f\u3081\u306eC++\u30af\u30e9\u30b9\u3092\u4f5c\u6210<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><span class=\"hljs-meta\">#<span class=\"hljs-keyword\">include<\/span> <span class=\"hljs-string\">&lt;jni.h&gt;<\/span><\/span>\r\n<span class=\"hljs-meta\">#<span class=\"hljs-keyword\">include<\/span> <span class=\"hljs-string\">&lt;QDebug&gt;<\/span><\/span>\r\n<span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">JavaInterface<\/span> {\r\n<span class=\"hljs-keyword\">public<\/span>:\r\n<span class=\"hljs-built_in\">JavaInterface<\/span>(JNIEnv *env);\r\n~<span class=\"hljs-built_in\">JavaInterface<\/span>();\r\n<span class=\"hljs-function\">QString <span class=\"hljs-title\">getData<\/span><span class=\"hljs-params\">()<\/span><\/span>;\r\n<span class=\"hljs-keyword\">private<\/span>:\r\nJavaVM *m_javaVM;\r\njobject m_javaObject;\r\n};\r\nJavaInterface::<span class=\"hljs-built_in\">JavaInterface<\/span>(JNIEnv *env) {\r\nenv-&gt;<span class=\"hljs-built_in\">GetJavaVM<\/span>(&amp;m_javaVM);\r\njclass javaClass = env-&gt;<span class=\"hljs-built_in\">FindClass<\/span>(<span class=\"hljs-string\">\"com\/example\/MyInterface\"<\/span>);\r\njmethodID javaConstructor = env-&gt;<span class=\"hljs-built_in\">GetMethodID<\/span>(javaClass, <span class=\"hljs-string\">\"&lt;init&gt;\"<\/span>, <span class=\"hljs-string\">\"()V\"<\/span>);\r\nm_javaObject = env-&gt;<span class=\"hljs-built_in\">NewObject<\/span>(javaClass, javaConstructor);\r\n}\r\nJavaInterface::~<span class=\"hljs-built_in\">JavaInterface<\/span>() {\r\nJNIEnv *env;\r\nm_javaVM-&gt;<span class=\"hljs-built_in\">AttachCurrentThread<\/span>((<span class=\"hljs-type\">void<\/span> **)&amp;env, <span class=\"hljs-literal\">NULL<\/span>);\r\nenv-&gt;<span class=\"hljs-built_in\">DeleteGlobalRef<\/span>(m_javaObject);\r\n}\r\n<span class=\"hljs-function\">QString <span class=\"hljs-title\">JavaInterface::getData<\/span><span class=\"hljs-params\">()<\/span> <\/span>{\r\nJNIEnv *env;\r\nm_javaVM-&gt;<span class=\"hljs-built_in\">AttachCurrentThread<\/span>((<span class=\"hljs-type\">void<\/span> **)&amp;env, <span class=\"hljs-literal\">NULL<\/span>);\r\njmethodID getDataMethod = env-&gt;<span class=\"hljs-built_in\">GetMethodID<\/span>(env-&gt;<span class=\"hljs-built_in\">GetObjectClass<\/span>(m_javaObject), <span class=\"hljs-string\">\"getData\"<\/span>, <span class=\"hljs-string\">\"()Ljava\/lang\/String;\"<\/span>);\r\njstring javaString = (jstring)env-&gt;<span class=\"hljs-built_in\">CallObjectMethod<\/span>(m_javaObject, getDataMethod);\r\n<span class=\"hljs-type\">const<\/span> <span class=\"hljs-type\">char<\/span> *nativeString = env-&gt;<span class=\"hljs-built_in\">GetStringUTFChars<\/span>(javaString, <span class=\"hljs-number\">0<\/span>);\r\nQString result = QString::<span class=\"hljs-built_in\">fromUtf8<\/span>(nativeString);\r\nenv-&gt;<span class=\"hljs-built_in\">ReleaseStringUTFChars<\/span>(javaString, nativeString);\r\n<span class=\"hljs-keyword\">return<\/span> result;\r\n}\r\n<span class=\"hljs-function\"><span class=\"hljs-type\">int<\/span> <span class=\"hljs-title\">main<\/span><span class=\"hljs-params\">(<span class=\"hljs-type\">int<\/span> argc, <span class=\"hljs-type\">char<\/span> *argv[])<\/span> <\/span>{\r\n<span class=\"hljs-function\">QCoreApplication <span class=\"hljs-title\">app<\/span><span class=\"hljs-params\">(argc, argv)<\/span><\/span>;\r\nJavaVMOption options[<span class=\"hljs-number\">1<\/span>];\r\nJavaVMInitArgs vm_args;\r\nJavaVM *javaVM;\r\nJNIEnv *env;\r\noptions[<span class=\"hljs-number\">0<\/span>].optionString = <span class=\"hljs-string\">\"-Djava.class.path=\/path\/to\/java\/classes\"<\/span>;\r\nvm_args.version = JNI_VERSION_1_6;\r\nvm_args.nOptions = <span class=\"hljs-number\">1<\/span>;\r\nvm_args.options = options;\r\nvm_args.ignoreUnrecognized = JNI_FALSE;\r\n<span class=\"hljs-built_in\">JNI_CreateJavaVM<\/span>(&amp;javaVM, (<span class=\"hljs-type\">void<\/span> **)&amp;env, &amp;vm_args);\r\n<span class=\"hljs-function\">JavaInterface <span class=\"hljs-title\">javaInterface<\/span><span class=\"hljs-params\">(env)<\/span><\/span>;\r\nQString data = javaInterface.<span class=\"hljs-built_in\">getData<\/span>();\r\n<span class=\"hljs-built_in\">qDebug<\/span>() &lt;&lt; <span class=\"hljs-string\">\"Data from Java: \"<\/span> &lt;&lt; data;\r\njavaVM-&gt;<span class=\"hljs-built_in\">DestroyJavaVM<\/span>();\r\n<span class=\"hljs-keyword\">return<\/span> app.<span class=\"hljs-built_in\">exec<\/span>();\r\n}\r\n<\/code><\/pre>\n<p>\u3054\u6ce8\u610f\u304f\u3060\u3055\u3044\u3002<\/p>\n<ol>\n<li>\/path\/to\/java\/classes \u3092 MyInterface.class \u304c\u3042\u308b\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u30d1\u30b9\u306b\u7f6e\u304d\u63db\u3048\u3066\u304f\u3060\u3055\u3044\u3002<\/li>\n<li>Java \u30af\u30e9\u30b9\u304c\u7570\u306a\u308b\u30d1\u30c3\u30b1\u30fc\u30b8\u306b\u3042\u308b\u5834\u5408\u306f\u3001FindClass \u30e1\u30bd\u30c3\u30c9\u306b\u5b8c\u5168\u306a\u30af\u30e9\u30b9\u540d (\u4f8b: com.example.MyInterface) \u3092\u6e21\u3059\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/li>\n<\/ol>\n<p>\u4e0a\u8a18\u306e\u30b3\u30fc\u30c9\u306f\u4e00\u4f8b\u3067\u3059\u3002\u5b9f\u969b\u306e\u4f7f\u7528\u306e\u969b\u306f\u3001\u3054\u8981\u671b\u306b\u5408\u308f\u305b\u3066\u4fee\u6b63\u30fb\u8abf\u6574\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Qt\u3067Java\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u547c\u3073\u51fa\u3059\u306b\u306f\u3001Qt\u306eJava Native Interface\uff08JNI\uff09\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002 Qt\u3067Java\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u3092\u547c\u3073\u51fa\u3057\u3001\u30c7\u30fc\u30bf\u3092\u53d6\u5f97\u3059\u308b\u65b9\u6cd5\u3092\u793a\u3059\u7c21\u5358\u306a\u30b5\u30f3\u30d7\u30eb\u3092\u4ee5\u4e0b\u306b\u793a\u3057\u307e\u3059 [&hellip;]<\/p>\n","protected":false},"author":10,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-127394","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>java\u30a4\u30f3\u30bf\u30d5\u30a7\u30fc\u30b9\u306e\u547c\u3073\u51fa\u3057\u3067Qt\u304b\u3089\u30c7\u30fc\u30bf\u3092\u53d6\u5f97\u3059\u308b\u65b9\u6cd5 - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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