全网首发：LINUX OpenCV编译java/jar版本注意事项

• 安装依赖库

# ant is needed.
sudo apt -y install cmake ant

# openjdk8

• 编译脚本

export BUILD_LIBS=${HOME}/lib-opencv
export  JAVA_HOME=${HOME}/jdk1.8.0_241

# after install ant, /bin/ant link is error. so fix it.
# sudo ln -snf /usr/share/ant/bin/ant /bin/ant

cd opencv-4.2.0

rm -rf build
mkdir build
cd build

cmake \
    -D CMAKE_BUILD_TYPE=RELEASE \
    -D CMAKE_INSTALL_PREFIX=${BUILD_LIBS} \
    ..

make
make install

# make clean
# rm -rf build

• 没有构建JAVA的提示

--   OpenCV modules:
--     To be built:                 calib3d core dnn features2d flann gapi highgui 
imgcodecs imgproc ml objdetect photo stitching video videoio
--     Disabled:                    world
--     Disabled by dependency:      -
--     Unavailable:                 java js python2 python3 ts
--     Applications:                apps
--     Documentation:               NO
--     Non-free algorithms:         NO

上图输出，明确说明编译不包含java。那么是什么原因呢？因为不符合条件。底部有提示：

--   Java:                          export all functions
--     ant:                         NO
--     JNI:                         /home/quantum6/tio-software/jdk1.8.0_241/include /home/quantum6/tio-software/jdk1.8.0_241/include/linux /home/quantum6/tio-software/jdk1.8.0_241/include
--     Java wrappers:               YES
--     Java tests:                  YES

 也就是ant不对。哪里出错？向上检查输出，吾找到原因并解决了问题。具体参考：

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• 构建JAVA的提示

--   OpenCV modules:
--     To be built:                 calib3d core dnn features2d flann gapi highgui imgcodecs imgproc java ml objdetect photo stitching video videoio
--     Disabled:                    world
--     Disabled by dependency:      -
--     Unavailable:                 js python2 python3 ts
--     Applications:                apps
--     Documentation:               NO
--     Non-free algorithms:         NO

JAVA部分也对了：

--   Java:                          export all functions
--     ant:                         /bin/ant (ver 1.10.5)
--     JNI:                         /home/quantum6/tio-software/jdk1.8.0_241/include /home/quantum6/tio-software/jdk1.8.0_241/include/linux /home/quantum6/tio-software/jdk1.8.0_241/include
--     Java wrappers:               YES
--     Java tests:                  YES