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java的jni 问题大总结

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<td width="90%"><font size="4" face="Verdana, Arial, Helvetica"><b>带有嵌入式 JVM 的 C++ 应用程序</b></font></td><td width="200" align="right"><font size="1" face="Verdana, Arial, Helvetica"><nobr>   第 7 页（共21 页）</nobr></font></td>
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<p>Sample2.cpp 是一个带有嵌入式 JVM 的 C++ 应用程序：</p>
<pre>
<code style="font-family: Courier New, Courier, monospace; font-size: 12">
 1. #include &lt;jni.h&gt;
 2.
 3. #ifdef _WIN32
 4. #define PATH_SEPARATOR ';'
 5. #else
 6. #define PATH_SEPARATOR ':'
 7. #endif
 8.
 9. int main()
10. {
11.	  JavaVMOption options[1];
12.	  JNIEnv *env;
13.	  JavaVM *jvm;
14.	  JavaVMInitArgs vm_args;
15.	  long status;
16.	  jclass cls;
17.	  jmethodID mid;
18.	  jint square;
19.	  jboolean not;
20.
21.	  options[0].optionString = "-Djava.class.path=.";
22.	  memset(&amp;vm_args, 0, sizeof(vm_args));
23.	  vm_args.version = JNI_VERSION_1_2;
24.	  vm_args.nOptions = 1;
25.	  vm_args.options = options;
26.	  status = JNI_CreateJavaVM(&amp;jvm, (void**)&amp;env, &amp;vm_args);
27.
28.	  if (status != JNI_ERR)
29.   {
30.	    cls = (*env)-&gt;FindClass(env, "Sample2");
31.	    if(cls !=0)
32.     {   mid = (*env)-&gt;GetStaticMethodID(env, cls, "intMethod", "(I)I");
33.	        if(mid !=0)
34.	        {  square = (*env)-&gt;CallStaticIntMethod(env, cls, mid, 5);
35.		       printf("Result of intMethod: %d\n", square);
36.	        }
37.
38.	        mid = (*env)-&gt;GetStaticMethodID(env, cls, "booleanMethod", "(Z)Z");
39.	        if(mid !=0)
40.	        {  not = (*env)-&gt;CallStaticBooleanMethod(env, cls, mid, 1);
41.		       printf("Result of booleanMethod: %d\n", not);
42.	        }
43.     }
44.
45.	    (*jvm)-&gt;DestroyJavaVM(jvm);
46.    return 0;
47.   }
48.	  else
49.	    return -1;
50. }

</code>
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