Python调用JAR包的类和方法详细指南

pip install JPype1

import jpype

# 启动JVM
jpype.startJVM(jpype.getDefaultJVMPath(), "-ea", "-Djava.class.path=your_jar_file.jar")

# 导入Java类
YourJavaClass = jpype.JClass("com.example.YourJavaClass")

# 创建实例
instance = YourJavaClass()

# 调用方法
result = instance.yourMethod(param1, param2)

# 关闭JVM（程序结束时必须调用）
jpype.shutdownJVM()

pip install pyjnius

from jnius import autoclass

# 设置类路径
import os
os.environ['CLASSPATH'] = 'your_jar_file.jar'

# 加载Java类
YourJavaClass = autoclass('com.example.YourJavaClass')

# 创建实例并调用方法
instance = YourJavaClass()
result = instance.yourMethod(param1, param2)

import subprocess

# 调用Java程序
result = subprocess.run(['java', '-jar', 'your_jar_file.jar', 'arg1', 'arg2'], 
                        capture_output=True, text=True)

print(result.stdout)

pip install JPype1

import jpype

# 启动JVM，指定类路径
jvm_path = jpype.getDefaultJVMPath()
classpath = "your_jar_file.jar"
jpype.startJVM(jvm_path, "-ea", f"-Djava.class.path={classpath}")

# 加载Java类
try:
    # 静态方法调用示例
    System = jpype.JClass("java.lang.System")
    System.out.println("Hello from Java!")
    
    # 实例方法调用示例
    ArrayList = jpype.JClass("java.util.ArrayList")
    list = ArrayList()
    list.add("item1")
    print(list.size())
    
    # 调用自定义JAR中的类
    YourClass = jpype.JClass("com.example.YourClass")
    instance = YourClass()
    result = instance.yourMethod("param1", 123)
    print(result)

finally:
    # 关闭JVM
    jpype.shutdownJVM()

try:
    # Java代码调用
except jpype.JavaException as e:
    print("Java异常:", e.message())
except Exception as e:
    print("Python异常:", str(e))

jpype.startJVM('/path/to/jre/lib/server/libjvm.so', ...)

# 对于方法重载的情况
result = instance.method(jpype.JInt(1), jpype.JString("text"))

jpype.startJVM(classpath=["jar1.jar", "jar2.jar", ...])

jpype.startJVM(..., "-agentlib:jdwp=transport=dt_socket,server=y,suspend=y,address=5005")