可以在官网下载jar包，官网:http://ftp.cuhk.edu.hk/pub/packages/apache.org/
或者使用maven进行jar包下载
<dependency>
<groupId>org.python</groupId>
<artifactId>jython-standalone</artifactId>
<version>2.7.0</version>
</dependency>
执行代码样例：
PythonInterpreter interpreter = new PythonInterpreter();
interpreter.exec("a=[5,2,3,9,4,0]; ");
interpreter.exec("print(sorted(a));");
Jython内置的库有限，而且很多库不存在，会报no model的错误，所以这里不推荐大家使用。
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
publicclass Demo1 {
publicstaticvoid main(String[] args) {
Process proc;
// 编译器是python
String exe = "python";
// py文件存的绝对路径
String path = "D:\\NLP.py";
// 传入的参数
String args = "今天过的很开心";
try {
proc = Runtime.getRuntime().exec(exe + ' ' + path + ' ' + args);// 执⾏py⽂件
// ⽤输⼊输出流来截取结果
BufferedReader in = new BufferedReader(new InputStreamReader(proc.getInputStream()));
String line = null;
while ((line = in.readLine()) != null) {
System.out.println(line);
}
in.close();
proc.waitFor();
} catch (IOException e) {
e.printStackTrace();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
如果在你的python中，会使用自己包中的其他python文件中的函数，那么很有可能无法导入，但是不会报错，只会返回一个null。
这个方法就类似于在cmd中，使用 python file.py 参数 直接执行python文件一样
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
publicclass Demo1 {
publicstaticvoid main(String[] args) {
Process proc;
// 编译器是python
String exe = "cmd.exe";
// py文件存的绝对路径
String path = "D:\\NLP.py";
// 传入的参数
String args = "今天过的很开心";
try {
proc = Runtime.getRuntime().exec(exe + " \c start " + path + ' ' + args);// 执⾏py⽂件
proc.waitFor();
} catch (Exception e) {
e.printStackTrace();
}
}
}
考虑到python是否正在进行，或者是否调用python，可设置一些函数用于辅助：
这里没有使用参数，直接对文件进行读取，传参可能会存在编码问题，Java默认UTF-8，cmd是GBK
package com.Lee.utils;
import java.io.*;
public class NLPUtils {
// NLP处理
public static String NLP(String data) throws Exception{
try {
inputToFile(data);
}
catch (Exception e){
e.printStackTrace();
}
System.out.println("调用python程序");
Process pcs = null;
String py = "python.exe";
try {
if(processIsRun(py))
killProcess(py);
System.out.println("start");
pcs = Runtime.getRuntime().exec("cmd.exe /c start F://python_project//NLP.bat");
pcs.waitFor();
if(processIsRun(py)){
System.out.println("正在执行");
Thread.currentThread().sleep(30000);
}
System.out.println("end");
}
catch (Exception e){
e.printStackTrace();
}
String result = "";
try {
System.out.println("out:" + outputFromFile());
result = outputFromFile();
}
catch (Exception e){
e.printStackTrace();
}
return result;
}
// 清空文件
public static void clearInfoForFile(String fileName) {
File file =new File(fileName);
try {
if(!file.exists()) {
file.createNewFile();
}
FileWriter fileWriter =new FileWriter(file);
fileWriter.write("");
fileWriter.flush();
fileWriter.close();
} catch (Exception e) {
e.printStackTrace();
}
}
// 输入文件，参数为输出字符串
public static void inputToFile(String input) throws Exception{
// 写入前清空
clearInfoForFile("F:\\python_project\\input.txt");
//创建写入流
FileWriter writer=new FileWriter("F:\\python_project\\input.txt");
// 写入
writer.write(input + "\r\n");
//关闭资源
writer.flush();
writer.close();
}
// 读取文件
public static String outputFromFile() throws Exception{
InputStreamReader isr = new InputStreamReader(new FileInputStream("F:\\python_project\\output.txt"), "GBK");
BufferedReader read = new BufferedReader(isr);
String s = null;
String result = "";
while((s = read.readLine()) != null)
result += s;
isr.close();
read.close();
return result;
}
// 杀掉一个进程
public static void killProcess(String name) {
try {
String[] cmd = {"tasklist"};
Process proc = Runtime.getRuntime().exec(cmd);
BufferedReader in = new BufferedReader(new InputStreamReader(proc.getInputStream()));
String string_Temp = in.readLine();
while (string_Temp != null) {
// System.out.println(string_Temp);
if (string_Temp.indexOf(name) != -1) {
Runtime.getRuntime().exec("taskkill /F /IM " + name);
System.out.println("杀死进程 " + name);
}
string_Temp = in.readLine();
}
} catch (Exception e) {
e.printStackTrace();
}
}
// 判断进程是否存在
public static boolean processIsRun(String ProjectName) {
boolean flag = false;
try {
Process p = Runtime.getRuntime().exec("cmd /c tasklist ");
ByteArrayOutputStream baos = new ByteArrayOutputStream();
InputStream os = p.getInputStream();
byte b[] = new byte[256];
while (os.read(b) > 0)
baos.write(b);
String s = baos.toString();
if (s.indexOf(ProjectName) >= 0) {
flag = true;
} else {
flag = false;
}
} catch (Exception e) {
e.printStackTrace();
}
return flag;
}
}
