java - 构建使用 opencv 可移植的 java 应用程序

Question

我想创建opencv嵌入到包中的可执行.jar文件。我的意思是我可以在另一台计算机上运行它。拜托，有人帮助我吗？？？

我在文件 SimpleSample.java 中有此代码:

import org.opencv.core.Core;
import org.opencv.core.Mat;
import org.opencv.core.CvType;
import org.opencv.core.Scalar;

class SimpleSample {

  static{ System.loadLibrary(Core.NATIVE_LIBRARY_NAME); }

  public static void main(String[] args) {
    System.out.println("Welcome to OpenCV " + Core.VERSION);
    Mat m = new Mat(5, 10, CvType.CV_8UC1, new Scalar(0));
    System.out.println("OpenCV Mat: " + m);
    Mat mr1 = m.row(1);
    mr1.setTo(new Scalar(1));
    Mat mc5 = m.col(5);
    mc5.setTo(new Scalar(5));
    System.out.println("OpenCV Mat data:\n" + m.dump());
  }
}

我尝试在使用 Ant 构建后运行它，build.xml:

<project name="SimpleSample" basedir="." default="rebuild-run">
    <property name="src.dir"     value="src"/>
    <property name="lib.dir"     value="${ocvJarDir}"/>
    <path id="classpath"><fileset dir="${lib.dir}" includes="**/*.jar"/></path>
    <property name="build.dir"   value="build"/>
    <property name="classes.dir" value="${build.dir}/classes"/>
    <property name="jar.dir"     value="${build.dir}/jar"/>
    <property name="main-class"  value="${ant.project.name}"/>
    <target name="clean"><delete dir="${build.dir}"/></target>
    <target name="compile">
        <mkdir dir="${classes.dir}"/>
        <javac includeantruntime="false" srcdir="${src.dir}" destdir="${classes.dir}" classpathref="classpath"/>
    </target>
    <target name="jar" depends="compile">
        <mkdir dir="${jar.dir}"/>
        <jar destfile="${jar.dir}/${ant.project.name}.jar" basedir="${classes.dir}">
            <manifest>
                <attribute name="Main-Class" value="${main-class}"/>
            </manifest>
        </jar>
    </target>
    <target name="run" depends="jar">
        <java fork="true" classname="${main-class}">
            <sysproperty key="java.library.path" path="${ocvLibDir}"/>
            <classpath>
                <path refid="classpath"/>
                <path location="${jar.dir}/${ant.project.name}.jar"/>
            </classpath>
        </java>
    </target>
    <target name="rebuild" depends="clean,jar"/>
    <target name="rebuild-run" depends="clean,run"/>
</project>

我遇到了这个异常:

Exception in thread "main" java.lang.NoClassDefFoundError: org/opencv/core/Core at SimpleSample.(Unknown Source) Caused by: java.lang.ClassNotFoundException: org.opencv.core.Core at java.net.URLClassLoader.findClass(URLClassLoader.java:381) at java.lang.ClassLoader.loadClass(ClassLoader.java:424) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331) at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ... 1 more

然后我尝试了 eclipse，得到了这个:

Exception in thread "main" java.lang.UnsatisfiedLinkError: no opencv_java300 in java.library.path at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1864) at java.lang.Runtime.loadLibrary0(Runtime.java:870) at java.lang.System.loadLibrary(System.java:1122) at test.Test.(Test.java:10) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:348) at org.eclipse.jdt.internal.jarinjarloader.JarRsrcLoader.main(JarRsrcLoader.java:56)

我必须做什么才能生成可以正常工作的 jar 文件？？？谢谢!!

观察:我已将 opencv 构建为静态库:

cmake -DBUILD_SHARED_LIBS=OFF ..

Answer 1

您需要使用 jar 文件打包静态库，将该静态库加载到临时文件中，然后从该路径加载静态库。

在资源中创建一个名为 opencv 的文件夹，并将 .dll 或 .dylib 文件放入各自的文件夹中。

public class LoadLibrary {
public static void loadOpenCV() {
    try {
        InputStream inputStream = null;
        File fileOut = null;
        String osName = System.getProperty("os.name");
        System.out.println(osName);

        if (osName.startsWith("Windows")) {
            int bitness = Integer.parseInt(System.getProperty("sun.arch.data.model"));
            if (bitness == 32) {
                inputStream = LoadLibrary.class.getResourceAsStream("/opencv/windows/x86/opencv_java300.dll");
                fileOut = File.createTempFile("lib", ".dll");
            } else if (bitness == 64) {
                inputStream = LoadLibrary.class.getResourceAsStream("/opencv/windows/x64/opencv_java300.dll");
                fileOut = File.createTempFile("lib", ".dll");
            } else {
                inputStream = LoadLibrary.class.getResourceAsStream("/opencv/windows/x86/opencv_java300.dll");
                fileOut = File.createTempFile("lib", ".dll");
            }
        } else if (osName.equals("Mac OS X")) {
            inputStream = LoadLibrary.class.getResourceAsStream("/opencv/mac/libopencv_java300.dylib");
            fileOut = File.createTempFile("lib", ".dylib");
        }

        if (fileOut != null) {
            OutputStream outputStream = new FileOutputStream(fileOut);
            byte[] buffer = new byte[1024];
            int length;

            while ((length = inputStream.read(buffer)) > 0) {
                outputStream.write(buffer, 0, length);
            }

            inputStream.close();
            outputStream.close();
            System.load(fileOut.toString());
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
}

}

更改静态{ System.loadLibrary(Core.NATIVE_LIBRARY_NAME); } 到 Main 中或调用 OpenCV 函数之前的 LoadLibrary.loadOpenCV();。

并尝试从 Eclipse 导出您的 jar 文件。它会工作得很好。