{"id":883,"date":"2024-09-30T18:16:14","date_gmt":"2024-09-30T10:16:14","guid":{"rendered":"https:\/\/www.zhuyanbin.com\/?p=883"},"modified":"2024-09-30T18:16:14","modified_gmt":"2024-09-30T10:16:14","slug":"%e5%9c%a8jni%e4%b8%ad%e4%bd%bf%e7%94%a8setsystemproperty","status":"publish","type":"post","link":"https:\/\/www.yanbin888.com\/?p=883","title":{"rendered":"\u5728JNI\u4e2d\u4f7f\u7528SetSystemProperty"},"content":{"rendered":"\n<p>\u5728 Java Native Interface (JNI) \u4e2d\uff0c<code>SetSystemProperty<\/code> \u5e76\u4e0d\u662f\u4e00\u4e2a\u76f4\u63a5\u53ef\u7528\u7684\u51fd\u6570\u6216\u65b9\u6cd5\u3002\u901a\u5e38\uff0c\u4f60\u4f1a\u901a\u8fc7 JNI \u8c03\u7528 Java \u7684\u7cfb\u7edf\u5c5e\u6027\u76f8\u5173\u65b9\u6cd5\u6765\u8bbe\u7f6e\u7cfb\u7edf\u5c5e\u6027\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u5982\u4f55\u5728 JNI \u4e2d\u8bbe\u7f6e\u7cfb\u7edf\u5c5e\u6027<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u83b7\u53d6\u00a0<code>java.lang.System<\/code>\u00a0\u7c7b<\/strong>\uff1a\u4f60\u9700\u8981\u9996\u5148\u83b7\u53d6\u00a0<code>System<\/code>\u00a0\u7c7b\u7684\u5f15\u7528\u3002<\/li>\n\n\n\n<li><strong>\u83b7\u53d6\u00a0<code>setProperty<\/code>\u00a0\u65b9\u6cd5<\/strong>\uff1a\u7136\u540e\u83b7\u53d6\u8fd9\u4e2a\u7c7b\u4e2d\u00a0<code>setProperty<\/code>\u00a0\u65b9\u6cd5\u7684\u5f15\u7528\u3002<\/li>\n\n\n\n<li><strong>\u8c03\u7528\u65b9\u6cd5<\/strong>\uff1a\u901a\u8fc7 JNI \u8c03\u7528\u8fd9\u4e2a\u65b9\u6cd5\u6765\u8bbe\u7f6e\u5c5e\u6027\u3002<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\">\u793a\u4f8b\u4ee3\u7801<\/h3>\n\n\n\n<p>\u4ee5\u4e0b\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u793a\u4f8b\uff0c\u5c55\u793a\u4e86\u5982\u4f55\u5728 JNI \u4e2d\u8bbe\u7f6e\u4e00\u4e2a\u7cfb\u7edf\u5c5e\u6027\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>#include &lt;jni.h>\n#include &lt;stdio.h>\n\nJNIEXPORT void JNICALL Java_YourClass_setProperty(JNIEnv *env, jobject obj) {\n    jclass systemClass = (*env)->FindClass(env, \"java\/lang\/System\");\n    if (systemClass == NULL) {\n        return; \/\/ \u5904\u7406\u9519\u8bef\n    }\n\n    jmethodID setPropertyMethod = (*env)->GetStaticMethodID(env, systemClass, \"setProperty\", \"(Ljava\/lang\/String;Ljava\/lang\/String;)Ljava\/lang\/String;\");\n    if (setPropertyMethod == NULL) {\n        return; \/\/ \u5904\u7406\u9519\u8bef\n    }\n\n    jstring key = (*env)->NewStringUTF(env, \"myProperty\");\n    jstring value = (*env)->NewStringUTF(env, \"myValue\");\n\n    (*env)->CallStaticObjectMethod(env, systemClass, setPropertyMethod, key, value);\n\n    \/\/ \u6e05\u7406\u5c40\u90e8\u5f15\u7528\n    (*env)->DeleteLocalRef(env, key);\n    (*env)->DeleteLocalRef(env, value);\n    (*env)->DeleteLocalRef(env, systemClass);\n}\n<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">\u4f7f\u7528\u6b65\u9aa4<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u7f16\u8bd1\u5e76\u751f\u6210\u5171\u4eab\u5e93<\/strong>\uff1a\u786e\u4fdd\u4f60\u7684 JNI \u4ee3\u7801\u7f16\u8bd1\u6b63\u786e\uff0c\u5e76\u751f\u6210\u76f8\u5e94\u7684\u5171\u4eab\u5e93\uff08\u5982\u00a0<code>.dll<\/code>\u3001<code>.so<\/code>\u00a0\u6587\u4ef6\uff09\u3002<\/li>\n\n\n\n<li><strong>\u5728 Java \u4e2d\u52a0\u8f7d\u672c\u5730\u5e93<\/strong>\uff1a\u4f7f\u7528\u00a0<code>System.loadLibrary(\"your_library_name\")<\/code>\u00a0\u6765\u52a0\u8f7d\u672c\u5730\u5e93\u3002<\/li>\n\n\n\n<li><strong>\u8c03\u7528 JNI \u65b9\u6cd5<\/strong>\uff1a\u4ece Java \u4ee3\u7801\u4e2d\u8c03\u7528\u00a0<code>setProperty<\/code>\u00a0\u65b9\u6cd5\u3002<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\">\u6ce8\u610f\u4e8b\u9879<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u8bbe\u7f6e\u7684\u7cfb\u7edf\u5c5e\u6027\u5728 JVM \u8fd0\u884c\u671f\u95f4\u6709\u6548\uff0c\u4f46\u4e0d\u4f1a\u5f71\u54cd\u5916\u90e8\u73af\u5883\u3002<\/li>\n\n\n\n<li>\u786e\u4fdd\u5728\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b\u5c0f\u5fc3\u4f7f\u7528\uff0c\u4ee5\u907f\u514d\u6f5c\u5728\u7684\u6570\u636e\u7ade\u4e89\u95ee\u9898\u3002<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>\u5728 Java Native Interface (JNI) \u4e2d\uff0cSetSystemProperty \u5e76\u4e0d\u662f\u4e00\u4e2a <span class=\"ellipsis\">&hellip;<\/span> <span class=\"more-link-wrap\"><a href=\"https:\/\/www.yanbin888.com\/?p=883\" class=\"more-link\"><span>Read More &rarr;<\/span><\/a><\/span><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4,57],"tags":[58,23],"class_list":["post-883","post","type-post","status-publish","format-standard","hentry","category-c","category-java","tag-java","tag-linux"],"_links":{"self":[{"href":"https:\/\/www.yanbin888.com\/index.php?rest_route=\/wp\/v2\/posts\/883","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.yanbin888.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.yanbin888.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.yanbin888.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.yanbin888.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=883"}],"version-history":[{"count":1,"href":"https:\/\/www.yanbin888.com\/index.php?rest_route=\/wp\/v2\/posts\/883\/revisions"}],"predecessor-version":[{"id":884,"href":"https:\/\/www.yanbin888.com\/index.php?rest_route=\/wp\/v2\/posts\/883\/revisions\/884"}],"wp:attachment":[{"href":"https:\/\/www.yanbin888.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=883"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.yanbin888.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=883"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.yanbin888.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=883"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}