python調用JAVA

python依賴包

jpype依賴安裝（需要使用jpype1安裝）

pip install jpype1

將java打成一個jar包

1、新建一個maven項目

2、項目目錄結構如圖所示
3、代碼部分

package forpy;

import java.text.SimpleDateFormat;
import java.util.Date;

public class test {

    public static String dateFormat() {
        Date date = new Date();
        SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        return simpleDateFormat.format(date);
    }

}

pom文件部分

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.zl</groupId>
    <artifactId>test</artifactId>
    <version>1.0-SNAPSHOT</version>
    <build>
        <finalName>test</finalName>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>8</source>
                    <target>8</target>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

4、然後在ide中點擊packeg，打成jar包

python調用jar包步驟

from jpype import *
import jpype

class GetJavaObj():
    def __init__(self):
        # 系統java路徑
        self.javapath = 'C:/Program Files/Java/jdk1.8.0_221/jre/bin/server/jvm.dll'
        # jar 地址
        self.jarpath = 'D:\\pythonProject\\pythonScript\\javademo\\'

    def get_java_obj(self, package_info,jar):
        """
        獲取java實例對象
        :param package_info:jar包信息(test爲jar包名；test3對應包內的類名 test.test3)
        :param jar:jar包名 例如：'test.jar'
        """
        # 當有依賴的JAR包存在時，一定要使用-Djava.ext.dirs參數進行引入
        # ("-Djava.ext.dirs=%s" %dependency)
        # 判斷虛擬機是否存活，啓動虛擬機
        result = jpype.isJVMStarted()
        try:
            if not result:
                startJVM(self.javapath, "-ea","-Djava.class.path=%s" % (self.jarpath+jar))
                print("startJVm")
        except Exception as e:
            print(e)
        j_obj = JClass(package_info)
        return j_obj

    def shutdown_jvm(self):
        """
        關閉虛擬機
        :return:
        """
        shutdownJVM()


if __name__ == "__main__":
    get_jar = GetJavaObj()
    get_java = get_jar.get_java_obj('forpy.test','test.jar')
    date_format = get_java.dateFormat()
    print(date_format)

結果：