如何在jar中打包opencv + java [英] How to package opencv +java in a jar

问题描述

我一直在使用Opencv 2.4.5和Java构建一个应用程序，现在想要分发应用程序。使用以下内容加载库：

I've been using Opencv 2.4.5 with Java for a while building an application and would now like to distribute the app. The library is loaded using the following:

static{ 
        System.loadLibrary("opencv_java245"); 
    }

工作正常。但是，在导出时，从jar运行时它不起作用：

which works fine. However, when exporting, it doesn't work when running from the jar:

java -jar build1.jar 

opencv_java245.jar文件作为用户库包含在内，并连接了一个本机文件（libopencv_java245.dylib）。当运行从Eclipse生成的可执行jar时，我得到下面的UnsatisfiedLinkError，尽管在eclipse中编译/运行正常。

The opencv_java245.jar file is included as a user library, with a native file (libopencv_java245.dylib) connected to it. When running the executable jar generated from Eclipse, I get the UnsatisfiedLinkError below, despite things compiling/running fine in eclipse.

Exception in thread "main" java.lang.UnsatisfiedLinkError: no opencv_java245 in java.library.path
    at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1860)
    at java.lang.Runtime.loadLibrary0(Runtime.java:845)
    at java.lang.System.loadLibrary(System.java:1084)
    at com.drawbridge.Main.<clinit>(Main.java:12)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:266)
    at org.eclipse.jdt.internal.jarinjarloader.JarRsrcLoader.main(JarRsrcLoader.java:56)

任何人都知道在罐子里打包OpenCV的简单方法吗？

Anyone know a simple way of packaging OpenCV in the jar?

更新：我现在已经筋疲力尽了。我可以将库添加到我的构建路径（而不是使用System.loadLibrary），这可以在eclipse中工作，但不能在jar中打包。我已经尝试了一切。我还检查了我正在尝试加载的动态库的类型 - 它是

Update: I have now exhausted everything. I can add the library to my build path (and not use System.loadLibrary) and that works in eclipse, but not when packaged in the jar. I've tried everything. I also checked the type of dynamic library I'm trying to load - it's

Mach-O 64-bit x86_64 dynamically linked shared library

看起来它应该可以正常工作。我用-D64和-D32来测试并得到两者相同的结果。

which seems like it should work fine. I've used -D64 and -D32 to test and get the same result with both.

推荐答案

正如Steven C所说，它就像从JAR中提取和加载DLL 以及错误报告。我对如何使用dylib略显无知，并试图与 OpenCV教程，它使用用户库添加jar，然后添加本机dylib。此外，由于某些原因加载资源，即使使用/是从src目录加载，而不是我的项目的根目录（在我做的测试项目中就是这种情况）。

As Steven C said, it was as in Extract and load DLL from JAR and also in a bug report. I was slightly ignorant of how to use dylibs and was trying to be consistent with an OpenCV tutorial which used a "user library" to add a jar, and then add the native dylib. Also, for some reason loading resources even when using "/" was loading from the src directory, not my project's root directory (which was the case in a test project I made).

对于那些尝试做同样事情的人，这里有一些代码可以提供帮助：

For those trying to do the same thing, here's some code to help:

private static void loadLibrary() {
    try {
        InputStream in = null;
        File fileOut = null;
        String osName = System.getProperty("os.name");
        Utils.out.println(Main.class, osName);
        if(osName.startsWith("Windows")){
            int bitness = Integer.parseInt(System.getProperty("sun.arch.data.model"));
            if(bitness == 32){
                Utils.out.println(Main.class, "32 bit detected");
                in = Main.class.getResourceAsStream("/opencv/x86/opencv_java245.dll");
                fileOut = File.createTempFile("lib", ".dll");
            }
            else if (bitness == 64){
                Utils.out.println(Main.class, "64 bit detected");
                in = Main.class.getResourceAsStream("/opencv/x64/opencv_java245.dll");
                fileOut = File.createTempFile("lib", ".dll");
            }
            else{
                Utils.out.println(Main.class, "Unknown bit detected - trying with 32 bit");
                in = Main.class.getResourceAsStream("/opencv/x86/opencv_java245.dll");
                fileOut = File.createTempFile("lib", ".dll");
            }
        }
        else if(osName.equals("Mac OS X")){
            in = Main.class.getResourceAsStream("/opencv/mac/libopencv_java245.dylib");
            fileOut = File.createTempFile("lib", ".dylib");
        }


        OutputStream out = FileUtils.openOutputStream(fileOut);
        IOUtils.copy(in, out);
        in.close();
        out.close();
        System.load(fileOut.toString());
    } catch (Exception e) {
        throw new RuntimeException("Failed to load opencv native library", e);
    }

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