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java通过jni调用opencv处理图像的方法

2019年07月19日  | 移动技术网IT编程  | 我要评论

1. 建立java文件

public class getimagefeature {
  static{
  system.loadlibrary("getimagefeaturedll"); 
  }
  public native int getimagefeaturebyname(string filename);
  public native int getimagefeaturebymemory();

  public static void main(string[] args) {
  getimagefeature test=new getimagefeature();
  string filename = "d:/testpic/6af1399a64d10a399ad3247c01656bb7.jpg";
  system.out.println(test.getimagefeaturebyname(filename)); 
  }
 }

2. 切换到工程src文件夹

javac getimagefeature.java

javah getimagefeature

生成 getimagefeature.h 文件

/* do not edit this file - it is machine generated */
#include <jni.h>
/* header for class getimagefeature */

#ifndef _included_getimagefeature
#define _included_getimagefeature
#ifdef __cplusplus
extern "c" {
#endif
 /*
 * class:  getimagefeature
 * method: getimagefeaturebyname
 * signature: (ljava/lang/string;)i
 */
 jniexport jint jnicall java_getimagefeature_getimagefeaturebyname
  (jnienv *, jobject, jstring);

 /*
 * class:  getimagefeature
 * method: getimagefeaturebymemory
 * signature: ()i
 */
 jniexport jint jnicall java_getimagefeature_getimagefeaturebymemory
  (jnienv *, jobject);

#ifdef __cplusplus
}
#endif
#endif

3. vs2013建立dll工程

添加getimagefeature.h 头文件，再添加getimagefeature.cpp文件，实现对应函数（工程属性中需包含jdk下的include目录）

c:\program files\java\jdk1.8.0_20\include

c:\program files\java\jdk1.8.0_20\include\win32

#include "getimagefeaturedll.h"
#include <opencv2/opencv.hpp>

/*
* class:  getimagefeature
* method: getimagefeaturebyname
* signature: (ljava/lang/string;)i
*/
jniexport jint jnicall java_getimagefeature_getimagefeaturebyname
(jnienv *env, jobject obj, jstring filename)
{
 const char *str_filename;
 str_filename = env->getstringutfchars(filename, false);

 cv::mat image = cv::imread(str_filename);
 cv::imshow("test", image);
 cv::waitkey(20000);
 return 0;


}

/*
* class:  getimagefeature
* method: getimagefeaturebymemory
* signature: ()i
*/
jniexport jint jnicall java_getimagefeature_getimagefeaturebymemory
(jnienv *, jobject)
{
 return 0;
}

编译生成对应的dll

4. 执行java程序

将生成dll复制到java工程src文件夹下，java xx 运行程序

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