Java调用Python
常见的java调用python脚本方式有两种,下面给大家介绍一下:
- 通过Jython.jar提供的类库实现
- 通过Runtime.getRuntime()开启进程来执行脚本文件
这两种方法我都尝试过,个人推荐第二种方法,因为Python有时需要用到第三方库,比如requests,而Jython不支持。所以本地安装Python环境并且安装第三库再用Java调用是最好的方法。
下面通过两个小例子,分别是不带参数和带参数的,展示如何使用Java调用Python脚本:
不带参栗子
Python代码
#!/usr/bin/python3
# -*- encoding: utf-8 -*-
'''
@File :javaToPython.py
@Time :2020/09/03 12:59:32
@Author :hejiang
@Software :vsCode
'''
def hello():
print('Hello,Python')
if __name__ == '__main__':
hello()
Java代码
package net.qmgf.proj.wbmining.fut.service.impl;
import java.io.BufferedReader;
import java.io.InputStreamReader;
/**
* java调用Python
*
* @author He
* @date 2020/9/3 13:01
* @return
**/
public class JavaToPython {
public static void main(String[] args) {
String[] arguments = new String[]{"python", "E:\\GIT\\gitee\\python-maiden\\7.数据处理\\PDF处理\\javaToPython.py"};
try {
Process process = Runtime.getRuntime().exec(arguments);
// BufferedReader in = new BufferedReader(new InputStreamReader(process.getInputStream(), "GBK"));
BufferedReader in = new BufferedReader(new InputStreamReader(process.getInputStream(), "UTF-8"));
String line;
while ((line = in.readLine()) != null) {
System.out.println(line);
}
in.close();
//java代码中的process.waitFor()返回值为0表示我们调用python脚本成功,
//返回值为1表示调用python脚本失败,这和我们通常意义上见到的0与1定义正好相反
int re = process.waitFor();
System.out.println(re);
} catch (Exception e) {
e.printStackTrace();
}
}
}
带参的栗子
Python代码
#!/usr/bin/python3
# -*- encoding: utf-8 -*-
'''
@File :javaToPython.py
@Time :2020/09/03 12:59:32
@Author :hejiang
@Software :vsCode
'''
import sys
def hello(name, age):
print('name:'+name)
print('age:'+age)
if __name__ == '__main__':
hello(sys.argv[1], sys.argv[2])
java代码
package net.qmgf.proj.wbmining.fut.service.impl;
import java.io.BufferedReader;
import java.io.InputStreamReader;
/**
* java调用Python
*
* @author He
* @date 2020/9/3 13:01
* @return
**/
public class JavaToPython {
public static void main(String[] args) {
String[] arguments = new String[]{"python", "E:\\GIT\\gitee\\python-maiden\\7.数据处理\\PDF处理\\javaToPython.py", "lei", "23"};
try {
Process process = Runtime.getRuntime().exec(arguments);
// BufferedReader in = new BufferedReader(new InputStreamReader(process.getInputStream(), "GBK"));
BufferedReader in = new BufferedReader(new InputStreamReader(process.getInputStream(), "UTF-8"));
String line;
while ((line = in.readLine()) != null) {
System.out.println(line);
}
in.close();
//java代码中的process.waitFor()返回值为0表示我们调用python脚本成功,
//返回值为1表示调用python脚本失败,这和我们通常意义上见到的0与1定义正好相反
int re = process.waitFor();
System.out.println(re);
} catch (Exception e) {
e.printStackTrace();
}
}
}