{"id":151,"date":"2009-05-09T11:01:42","date_gmt":"2009-05-09T03:01:42","guid":{"rendered":"http:\/\/percy.blog.ubuntu.org.cn\/?p=151"},"modified":"2009-05-09T11:01:42","modified_gmt":"2009-05-09T03:01:42","slug":"%e5%9c%a8linux%e5%b9%b3%e5%8f%b0%e4%b8%8b%e4%bd%bf%e7%94%a8jni%e6%88%91%e7%9a%84%e6%93%8d%e4%bd%9c%e8%bf%87%e7%a8%8b","status":"publish","type":"post","link":"https:\/\/pjq.me\/?p=151","title":{"rendered":"\u5728Linux\u5e73\u53f0\u4e0b\u4f7f\u7528JNI,\u6211\u7684\u64cd\u4f5c\u8fc7\u7a0b"},"content":{"rendered":"<p>\u63a5\u4e0a\u4e00\u7bc7\uff1ahttp:\/\/percy.blog.ubuntu.org.cn\/2009\/05\/09\/%E5%9C%A8linux%E5%B9%B3%E5%8F%B0%E4%B8%8B%E4%BD%BF%E7%94%A8jni%E8%BD%AC\/<\/p>\n<p>1.<\/p>\n<pre lang=\"c\">\npjq@localhost ~\/workspace\/jni $ cat Hello.java\npublic class Hello\n{\nstatic\n{\ntry\n{\n\/\/\u6b64\u5904\u5373\u4e3a\u672c\u5730\u65b9\u6cd5\u6240\u5728\u94fe\u63a5\u5e93\u540d\nSystem.loadLibrary(\"hello\");\n}\ncatch(UnsatisfiedLinkError e)\n{\nSystem.err.println( \"Cannot load hello library:\\n \" +\ne.toString() );\n}\n}\npublic Hello()\n{\n}\n\/\/\u58f0\u660e\u7684\u672c\u5730\u65b9\u6cd5\npublic native void SayHello(String strName);\n}<\/pre>\n<p>2.<\/p>\n<div class=\"codetitle\"><strong>\u4ee3\u7801:<\/strong><\/div>\n<div class=\"codecontent\">pjq@localhost ~\/workspace\/jni $ javac Hello.java<\/div>\n<p>3.\u751f\u6210Hello.h<\/p>\n<div class=\"codetitle\"><strong>\u4ee3\u7801:<\/strong><\/div>\n<div class=\"codecontent\">pjq@localhost ~\/workspace\/jni $ javah Hello<\/div>\n<p>4.<br \/>\n\u521b\u5efaHello.cpp<\/p>\n<div class=\"codetitle\"><strong>\u4ee3\u7801:<\/strong><\/div>\n<div class=\"codecontent\">\n<pre lang=\"c\">\npjq@localhost ~\/workspace\/jni $ cat Hello.cpp\n#include \"Hello.h\"\n#include &lt;stdio.h&gt;\n\/\/\u4e0eHello.h\u4e2d\u51fd\u6570\u58f0\u660e\u76f8\u540c\nJNIEXPORT void JNICALL Java_Hello_SayHello\u00a0 (JNIEnv * env, jobject arg, jstring instring)\n{\n\/\/\u4eceinstring\u5b57\u7b26\u4e32\u53d6\u5f97\u6307\u5411\u5b57\u7b26\u4e32UTF\u7f16\u7801\u7684\u6307\u9488\nconst jbyte *str =\n(const jbyte *)env-&gt;GetStringUTFChars( instring, JNI_FALSE );\nprintf(\"Hello,%s\\n\",str);\n\/\/\u901a\u77e5\u865a\u62df\u673a\u672c\u5730\u4ee3\u7801\u4e0d\u518d\u9700\u8981\u901a\u8fc7str\u8bbf\u95eeJava\u5b57\u7b26\u4e32\u3002\nenv-&gt;ReleaseStringUTFChars( instring, (const char *)str );\nreturn;\n}<\/pre>\n<p>5.\u7f16\u8bd1\u751f\u6210\u5171\u4eab\u5e93<\/p>\n<div class=\"codetitle\"><strong>\u4ee3\u7801:<\/strong><\/div>\n<div class=\"codecontent\">gcc -I$JAVA_HOME\/include -I$JAVA_HOME\/include\/linux -fPIC -c Hello.cpp<\/div>\n<div class=\"codetitle\"><strong>\u4ee3\u7801:<\/strong><\/div>\n<div class=\"codecontent\">gcc -shared -Wl,-soname,libhello.so.1 -o libhello.so.1.0 Hello.o<\/div>\n<div class=\"codetitle\"><strong>\u4ee3\u7801:<\/strong><\/div>\n<div class=\"codecontent\">cp libhello.so.1.0 libhello.so<br \/>\nexport LD_LIBRARY_PATH=`pwd`:$LD_LIBRARY_PATH<\/div>\n<p>6.\u521b\u5efa\u6d4b\u8bd5JAVA\u7a0b\u5e8f<\/p>\n<div class=\"codetitle\"><strong>\u4ee3\u7801:<\/strong><\/div>\n<div class=\"codecontent\">\n<pre lang=\"java\">\nimport Hello;\nimport java.util.*;\npublic class ToSay\n{\npublic static void main(String argv[])\n{\nToSay say = new ToSay();\n}\npublic ToSay()\n{\nHello h = new Hello();\n\/\/\u8c03\u7528\u672c\u5730\u65b9\u6cd5\u5411John\u95ee\u597d\nh.SayHello(\"John\");\n}\n}<\/pre>\n<p>\u7f16\u8bd1\uff0c\u51fa\u73b0\u9519\u8bef\uff1a<\/p>\n<div class=\"codetitle\"><strong>\u4ee3\u7801:<\/strong><\/div>\n<div class=\"codecontent\">pjq@localhost ~\/workspace\/jni $ javac ToSay.java<br \/>\nToSay.java:2: \u9700\u8981 &#8216;.&#8217;<br \/>\nimport Hello;<br \/>\n^<br \/>\nToSay.java:2: \u9700\u8981 &#8216;;&#8217;<br \/>\nimport Hello;<br \/>\n^<br \/>\nToSay.java:4: \u9700\u8981\u4e3a class\u3001interface \u6216 enum<br \/>\nimport java.util.*;<br \/>\n^<br \/>\n3 \u9519\u8bef<\/div>\n<p>\u89e3\u51b3\u65b9\u6cd5\uff1a\u5c06import Hello;\u6ce8\u6389\uff1a<\/p>\n<div class=\"codetitle\"><strong>\u4ee3\u7801:<\/strong><\/div>\n<div class=\"codecontent\">\n<pre lang=\"java\">\npjq@localhost ~\/workspace\/jni $ cat ToSay.java\/\/import Hello;\n\nimport java.util.*;\n\npublic class ToSay\n{\npublic static void main(String[]argv)\n{\nHello h = new Hello();\nh.SayHello(\"John\");\n}\npublic ToSay()\n{\n}\n}<\/pre>\n<p>\u7f16\u8bd1\u6267\u884c\uff1a<\/p>\n<div class=\"codetitle\"><strong>\u4ee3\u7801:<\/strong><\/div>\n<div class=\"codecontent\">pjq@localhost ~\/workspace\/jni $ javac ToSay.java<br \/>\npjq@localhost ~\/workspace\/jni $ java ToSay<br \/>\nHello,John<\/div>\n","protected":false},"excerpt":{"rendered":"<p>\u63a5\u4e0a\u4e00\u7bc7\uff1ahttp:\/\/percy.blog.ubuntu.org.cn\/2009\/05\/09\/%E5%9C%A8linux%E5%B9%B3%E5%8F%B0%E4%B8%8B%E4%BD%BF%E7%94%A8jni%E8%BD%AC\/ 1. pjq@localhost ~\/workspace\/jni $ cat Hello.java public class Hello { static { try { \/\/\u6b64\u5904\u5373\u4e3a\u672c\u5730\u65b9\u6cd5\u6240\u5728\u94fe\u63a5\u5e93\u540d System.loadLibrary(&#8220;hello&#8221;); } catch(UnsatisfiedLinkError e) { System.err.println( &#8220;Cannot load hello library:\\n &#8221; + e.toString() ); } } public Hello() { } \/\/\u58f0\u660e\u7684\u672c\u5730\u65b9\u6cd5 public native void<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[34],"tags":[],"class_list":["post-151","post","type-post","status-publish","format-standard","hentry","category-java"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>\u5728Linux\u5e73\u53f0\u4e0b\u4f7f\u7528JNI,\u6211\u7684\u64cd\u4f5c\u8fc7\u7a0b - Jianqing&#039;s Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, 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