使用javah 给.class类编译jni_helloworld.h文件头

第一步,在idea中,编写java文件,并且编译

package jni;

public class HelloWorld {
    static {
        System.loadLibrary("HelloWorld");

    }
    public native static void say(String content);

    public static void main(String[] args) {
        HelloWorld.say("JNI native Hello World!");
    }
}

第二步在idea中,浏览class文件进入D:\wksp_study\designbook\target\classes 目录,这个目录下边就是包名文件

在这个文件中打开cmd,D:\wksp_study\designbook\target\classes>javah -classpath D:\wksp_study\designbook\target\classes jni.HelloWorld

生成jni_HelloWorld.h文件头

/* DO NOT EDIT THIS FILE - it is machine generated */
#include <jni.h>
/* Header for class jni_HelloWorld */

#ifndef _Included_jni_HelloWorld
#define _Included_jni_HelloWorld
#ifdef __cplusplus
extern "C" {
#endif
/*
 * Class:     jni_HelloWorld
 * Method:    say
 * Signature: (Ljava/lang/String;)V
 */
JNIEXPORT void JNICALL Java_jni_HelloWorld_say
  (JNIEnv *, jclass, jstring);

#ifdef __cplusplus
}
#endif
#endif