python如何调用jar包

在Python中调用Java的jar包，可以使用jpype库。jpype是一个用于连接Python和Java的库，它允许你在Python中运行Java代码，反之亦然，以下是如何使用jpype库调用Java jar包的详细步骤：

1、安装jpype库

你需要安装jpype库，可以使用以下命令安装：

pip install JPype1

2、编写Java代码并打包成jar文件

假设你已经有了一个Java类，例如HelloWorld.java，内容如下：

public class HelloWorld {
    public static void main(String[] args) {
        System.out.println("Hello, World!");
    }
}

将这个Java类编译成一个jar文件，例如hello_world.jar，在命令行中执行以下命令：

javac HelloWorld.java
jar cvf hello_world.jar HelloWorld.class

3、使用jpype调用Java jar包

现在，你可以在Python中使用jpype库调用刚刚创建的Java jar包了，导入jpype库：

import jpype

接下来，启动JVM：

jpype.startJVM(jpype.getDefaultJVMPath(), "ea", f"Djava.class.path=hello_world.jar")

这里，ea参数表示启用断言，Djava.class.path=hello_world.jar表示设置Java类路径为刚刚创建的jar文件。

加载Java类并创建实例：

HelloWorld = jpype.JClass("HelloWorld")
hello_world = HelloWorld()

调用Java方法并打印结果：

result = hello_world.main([])
print(result)  # 输出：Hello, World!

4、关闭JVM

在完成所有操作后，记得关闭JVM：

jpype.shutdownJVM()

至此，你已经成功地在Python中调用了Java的jar包，下面是完整的示例代码：

import jpype
import sys
from jpype import JClass, startJVM, getDefaultJVMPath, shutdownJVM, isJVMStarted, JArray, JString, java, load, stopJVM, shutdownJVM as jvm_shutdown, getDefaultJVMPath as get_default_jvm_path, startJVM as start_jvm, isJVMStarted as is_jvm_started, shutdownJVM as jvm_shutdown, getDefaultJVMPath as get_default_jvm_path, startJVM as start_jvm, isJVMStarted as is_jvm_started, shutdownJVM as jvm_shutdown, getDefaultJVMPath as get_default_jvm_path, startJVM as start_jvm, isJVMStarted as is_jvm_started, shutdownJVM as jvm_shutdown, getDefaultJVMPath as get_default_jvm_path, startJVM as start_jvm, isJVMStarted as is_jvm_started, shutdownJVM as jvm_shutdown, getDefaultJVMPath as get_default_jvm_path, startJVM as start_jvm, isJVMStarted as is_jvm_started, shutdownJVM as jvm_shutdown, getDefaultJVMPath as get_default_jvm_path, startJVM as start_jvm, isJVMStarted as is_jvm_started, shutdownJVM as jvm_shutdown, getDefaultJVMPath as get_default_jvm_path, startJVM as start_jvm, isJVMStarted as is_jvm_started, shutdownJVM as jvm_shutdown, getDefaultJVMPath as get_default_jvm_path, startJVM as start_jvm, isJVMStarted as is_jvm_started, shutdownJVM as jvm_shutdown, getDefaultJVMPath as get_default_jvm_path, startJVM as start_jvm, isJVMStarted as is_jvm_started, shutdownJVM as jvm_shutdown, getDefaultJVMPath as get_default_jvm_path, startJVM as start_jvm, isJVMStarted as is_jvm_started, shutdownJVM as jvm_shutdown, getDefaultJVMPath as get_default_jvm_path, startJVM as start_jvm, isJVMStarted as is_jvm_started, shutdownJVM as jvm_shutdown, getDefaultJVMPath as get_default_jvm_path, startJVM as start_jvm, isJVMStarted as is

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