如何将OpenCV lib添加到Dynamic Web Project

Question

目前,我正在构建一个使用Opencv来检测相似图像的Java Web项目.但是当我跑步时,我总是得到这个错误

java.lang.UnsatisfiedLinkError:期望库的绝对路径:opencv_java249 java.lang.Runtime.load0(Runtime.java:806)java.lang.System.load(System.java:1086)com.hadoop.DriverServlet.doPost (DriverServlet.java:25)javax.servlet.http.HttpServlet.service(HttpServlet.java:650)javax.servlet.http.HttpServlet.service(httpServlet.java:731)org.apache.tomcat.websocket.server.WsFilter .doFilter(WsFilter.java:52)

我也搜索这个问题,但仍然找不到我的案例的任何解决方案.甚至我试着将http://examples.javacodegeeks.com/java-basics/java-library-path-what-is-it-and-how-to-use/添加到java.library路径指向opencv-249日食罐但仍未解决.

有人可以帮帮我吗？提前致谢.

Answer 1

要使用 opencv，您需要 jar 文件和二进制文件。JAR 文件可以简单地通过本地 Maven 存储库或任何其他变体添加。

您需要手动添加和加载二进制文件。像这样的东西：

private static void addLibraryPath(String pathToAdd) throws Exception{
    final Field usrPathsField = ClassLoader.class.getDeclaredField("usr_paths");
    usrPathsField.setAccessible(true);

    //get array of paths
    final String[] paths = (String[])usrPathsField.get(null);

    //check if the path to add is already present
    for(String path : paths) {
        if(path.equals(pathToAdd)) {
            return;
        }
    }

    //add the new path
    final String[] newPaths = Arrays.copyOf(paths, paths.length + 1);
    newPaths[newPaths.length-1] = pathToAdd;
    usrPathsField.set(null, newPaths);
}

public void init() {
        String pathToOpenCvDll = "c:\\opencv\\"; //linux path works too
        try {
            addLibraryPath(pathToOpenCvDll);
            System.loadLibrary("opencv_java320");
        } catch (Exception ignored) {
        }
    }
}