python调用java代码 java虚拟机（jvm）

package com;

public class fibnq {
    public fibnq(){}

    public int  fb(int n){
        if(n <2){
            return 1;
        }else {
            return fb(n-1)+fb(n-2);
        }
    }
}

javac ./fibnq.java

cd ../

jar cvf test.jar com

import time

from jpype import *
import os

if __name__ == ‘__main__‘:
    jdkPath = r"D:\Java1.8\jdk1.8.0_191\jre\bin\server\jvm.dll"

    #  注意一个重要的问题，导入包的时候路径不能有中文。
    jarpath = os.path.join(os.path.abspath(‘.‘), ‘test.jar‘)
    print(jarpath)
    startJVM(jdkPath,"-ea","-Djava.class.path=%s" % jarpath) #
    java.lang.System.out.println(" helloworld! ")
    fibnq = JClass(‘javaIoStream.fibnq‘)
    # 或者通过JPackage引用Test类
    # javaIoStream = JPackage(‘javaIoStream‘)
    # fibnq = javaIoStream.fibnq()
    st = time.time()
    for i in range(40):
        print(fibnq().fb(i))

    print(time.time()-st)
    shutdownJVM()