docker pull centos:centos7(拉取镜像)
docker run -itd --name centos-test centos:centos7 (运行容器)
docker exec -it centos-test /bin/bash (进入容器)
举例使用JNI调用c++ googleS2:
(安装编译c++版本googlS2依赖)
yum -y install cmake libgflags-dev libgoogle-glog-dev libgtest-dev libssl-dev(其中yum源应该是没有libssl-dev这个包)
(拷贝预先下载的本地文件到centos:
docker ps(查看容器名字centos-test)
docker inspect -f '{{.Id}}' centos-test(根据名字获得CONTAINER ID 完整ID:87880fa28f280a5a01712d4104d8ed31700363b10dd784aaafbb6abc6428aad5)
docker cp /本机绝对路径/googletest-release-1.8.0.tar.gz 87880fa28f280a5a01712d4104d8ed31700363b10dd784aaafbb6abc6428aad5:/root/googletest-release-1.8.0.tar.gz
)
tar xvzf googletest-release-1.8.0.tar.gz
mkdir googleS2
cd googleS2/
(安装git:
yum install git
git config --global user.name “名字”
git config --global user.email 邮箱)
git clone https://github.com/google/s2geometry.git
cd s2geometry/
mkdir build
cd build/
cmake -DGTEST_ROOT=/root/googletest-release-1.8.0/googletest/ ..
(出错,原因cmake版本太低,升级:
cd /opt/
(安装wget:
yum -y install wget)
wget https://cmake.org/files/v3.10/cmake-3.10.2-Linux-x86_64.tar.gz
yum remove cmake
tar zxvf cmake-3.10.2-Linux-x86_64.tar.gz
vi /etc/profile.d/cmake.sh
写入:
export CMAKE_HOME=/opt/cmake-3.10.2-Linux-x86_64
export PATH=$PATH:$CMAKE_HOME/bin
保存退出
source /etc/profile
cmake -version
可查看到最新的cmake版本
)
cd /root/googleS2/s2geometry/build/
cmake -DGTEST_ROOT=/root/googletest-release-1.8.0/googletest ..
(缺少g++编译器,安装:
yum install gcc
yum install gcc-c++
yum install make
)
cmake -DGTEST_ROOT=/root/googletest-release-1.8.0/googletest ..
(缺少openssl安装:
yum install openssl
yum install openssl-devel)
cmake -DGTEST_ROOT=/root/googletest-release-1.8.0/googletest ..
make
make test
sudo make install
centos7安装java1.8
yum install java-1.8.0-openjdk
yum install java-devel
update-alternatives --config java
之后就可以进行正常的JNI开发了。
vi LinuxJNI.java
public class LinuxJNI{ public native void sayHello(); static { System.load("/绝对路径/libs2.so");//当libs2.so变更存放位置时需要明确指定,默认安装位置是/usr/local/lib/libs2.so,可以不指定 System.load("/root/googleS2/s2geometry/src/liblinuxjni.so"); } public static void main(String[] args){ System.out.println("hello world"); LinuxJNI lj = new LinuxJNI(); lj.sayHello(); } }
javac LinuxJNI.java
javah LinuxJNI(获得LinuxJNI.h)
vi LinuxJNI.cc
#include <iostream> #include "LinuxJNI.h" #include "s2/s2polyline.h" #include "s2/s2latlng.h" #include <vector> using namespace std; JNIEXPORT void JNICALL Java_LinuxJNI_sayHello (JNIEnv *, jobject){ cout << " hello from jni" << endl; S2LatLng latlng_one = S2LatLng::FromDegrees(39.965377,116.392767); S2LatLng latlng_two = S2LatLng::FromDegrees(39.968699,116.400642); S2LatLng latlng_three = S2LatLng::FromDegrees(39.968929,116.407616); S2LatLng line[] = {latlng_one,latlng_two,latlng_three}; const vector<S2LatLng> s2line(line,line+3); S2Polyline s2Polyline = S2Polyline(s2line); //S2Polyline 相关方法使用
...... }
g++ -fPIC -D_REENTRANT -I/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.252.b09-2.el7_8.x86_64/include -I/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.252.b09-2.el7_8.x86_64/include/linux/ -std=c++11 -c LinuxJNI.cc
g++ -shared -o liblinuxjni.so LinuxJNI.o /usr/local/lib/libs2.so
objdump -x liblinuxjni.so | grep NEEDED (检查是否依赖libs2.so成功)
java LinuxJNI 查看运行结果。