Python调用java程序

# 安装
pip install jpype1

# -*- coding:utf-8 -*-
from jpype import *
'''
调用标准代码
'''
if __name__ == "__main__":
    # 启动java虚拟机
    startJVM(getDefaultJVMPath(), "-ea")
    # 调用println函数
    java.lang.System.out.println("hello python java")
    # 关闭虚拟机
    shutdownJVM()

public class JPypeDemo{
    public String say(String user){
        return "java say: " + user;
    }
    public int calc(int a, int b){
        return a + b;
    }}

# 编译
javac JPypeDemo.java
# 打包
jar cvf JPypeDemo.jar JPypeDemo.class

# -*- coding:utf-8 -*-
from jpype import *
import os
if __name__ == "__main__":
    # 启动java虚拟机
    # 注意使用了-D选项指定了jar的目标位置
    startJVM(getDefaultJVMPath(), "-ea", 
        "-Djava.class.path=%s" % (os.getcwd() + "/JPypeDemo.jar"))
    # 加载自定义的java class
    JDClass = JClass("JPypeDemo")
    jd = JDClass()   
    # 获取java标准库打印函数
    jprint = java.lang.System.out.println    
    # 调用自定义class中的函数，并输出返回值
    jprint(jd.say("deeptest"))
    jprint(jd.calc(1, 4))
    # 关闭虚拟机
    shutdownJVM()