javac JniTest.java -d .

javah -classpath . -o JniTest.h com.apple.cai.JniTest

g++ -dynamiclib -o JniTest.jnilib JniTest.cpp -framework JavaVM -I/Library/Java/JavaVirtualMachines/jdk1.7.0_80.jdk/Contents/Home/include -I/Library/Java/JavaVirtualMachines/jdk1.7.0_80.jdk/Contents/Home/include/darwin

java -Djava.library.path=/Users/apple/JavaProjects -classpath . com.apple.cai.JniTest

使用以上方式运行就是一直报异常，一直找不到原因

Exception in thread "main" java.lang.UnsatisfiedLinkError: no JniTest in java.library.path
    at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1886)
    at java.lang.Runtime.loadLibrary0(Runtime.java:849)
    at java.lang.System.loadLibrary(System.java:1088)
    at JniTest.<clinit>(JniTest.java:7)

根据这个网址的方式http://mrjoelkemp.com/2012/01/getting-started-with-jni-and-c-on-osx-lion/
竟然可以了

javac HelloWorld.java

javah -jni HelloWorld

g++ -I/Library/Java/JavaVirtualMachines/jdk1.7.0_80.jdk/Contents/Home/include -I/Library/Java/JavaVirtualMachines/jdk1.7.0_80.jdk/Contents/Home/include/darwin -c HelloWorld.cpp

g++ -dynamiclib -o libhelloworld.jnilib HelloWorld.o

java HelloWorld

区别就在于第三第四个命令行(第三行的路径是我电脑上的jni.h的路径地址)，而且使用后一种方式竟然不用指定搜索路径（疑惑），如果有大神知道什么原因，望指点一二。不甚感激

JNI官方文档翻译 http://blog.csdn.net/mtaxot/article/details/51422690
Android JNI原理分析 http://gityuan.com/2016/05/28/android-jni/