python如何调用java的jar包

pip3 install JPype1

import jpype
#jar绝对包路径
jar_path = '/Users/qinhaili/Desktop/MathUtil.jar'
print(jar_path)
#获取默认的 JVM 路径
jvmPath = jpype.getDefaultJVMPath()
#启动 JAVA 虚拟机
jpype.startJVM(jvmPath,"-ea",f"-Djava.class.path={jar_path}")
#环境测试代码,#成功输出说明安装环境成功
jpype.java.lang.System.out.println( "hello world!" )
#获取java类
java_class = jpype.JClass('MathUtil')
#类调用静态方法(类.方法名())
result1 = java_class.sayHello()
print(result1)
#调用对象方法(类实例.方法名())
#实话java类
class_obj = java_class()
result2 = class_obj.add(1,2)
print(result2)
#关闭JAVA虚拟机
jpype.shutdownJVM()

class MathUtil{
	
    public static String sayHello() {
        return "Hello How are you";
    }
    
    public MathUtil() {

    }

    public int add(int a, int b) {
        return a + b;
    }
}

javac Hello.java

jar cf xxxx.jar xxx.class

import subprocess

java_path = "/usr/bin/java"  # Java 的路径
jar_path = "path/to/your/jar/file.jar"  # jar 包的路径

# 要执行的命令
cmd = [java_path, "-jar", jar_path]

# 执行
proc = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
out, err = proc.communicate()

# 打印输出和错误
print(out.decode("utf-8"))
print(err.decode("utf-8"))

from java.lang import Runtime

jar_path = "path/to/your/jar/file.jar"  # jar 包的路径

# 获取当前 JVM 实例
jvm = Runtime.getRuntime()

# 加载 jar 包
jvm.load(jar_path)

# 调用 jar 包中的方法
result = jvm.callMethod("com.example.YourClass", "yourMethod", arg1, arg2)

# 打印结果
print(result)