Java调用python代码的五种方式总结

try {
	String exe = "python解释器所处的绝对路径";
	String py = "python代码文件绝对地址";
	Process process = Runtime.getRuntime().exec(exe + " " + py);
	//获取结果的同时设置输入流编码格式"gb2312"
	InputStreamReader isr = new InputStreamReader(process.getInputStream(),"gb2312");
	LineNumberReader input = new LineNumberReader(isr);
	String result = "";
	result = input.readLine();
	System.out.println(result);
	input.close();
	isr.close();
	process.waitFor();
} catch (InterruptedException | IOException e) {
	System.out.println("调用python脚本并读取结果时出错：" + e.getMessage());
}

String exe = "python解释器所处的绝对路径";
String py = "python代码文件绝对地址";
String pram = "单个传递参数，若参数为基本类型，转化为String；若为数组等类型，也是将其转换为String型";
String [] args = new String[] {exe, py, pram...};
Process process = Runtime.getRuntime().exec(args);

try {
	String exe = "python解释器所处的绝对路径";
	String py = "python代码文件绝对地址";
	String pram = "单个传递参数，若参数为基本类型，转化为String；若为数组等类型，也是将其转换为String型";
	String [] args = new String[] {exe, py, pram...};
	Process process = Runtime.getRuntime().exec(args);
	//获取结果的同时设置输入流编码格式"gb2312"
	InputStreamReader isr = new InputStreamReader(process.getInputStream(),"gb2312");
	LineNumberReader input = new LineNumberReader(isr);
	String result = "";
	result = input.readLine();
	System.out.println(result);
	input.close();
	isr.close();
	process.waitFor();
} catch (InterruptedException | IOException e) {
	System.out.println("调用python脚本并读取结果时出错：" + e.getMessage());
}

try {
	String exe = "python解释器所处的绝对路径";
	String py = "python代码文件绝对地址";
	String pram = "单个传递参数，若参数为基本类型，转化为String；若为数组等类型，也是将其转换为String型";
	String [] args = new String[] {exe, py, pram...};
	ProcessBuilder builder = new ProcessBuilder(args);
    Process process = builder.start();
    BufferedReader success = new BufferedReader(new InputStreamReader(process.getInputStream(), "GB2312"));//获取字符输入流对象
    BufferedReader error = new BufferedReader(new InputStreamReader(process.getErrorStream(), "GB2312"));//获取错误信息的字符输入流对象
    String line = null;
    List<String> success_result = new ArrayList<>();
    List<String> error_result = new ArrayList<>();
    //记录输出结果
    while ((line = success.readLine()) != null) {
        success_result.add(line);
    }
    //记录错误信息
    while ((line = error.readLine()) != null) {
        error_result.add(line);
    }
    success.close();
    error.close();
    process.waitFor();
    System.out.println(success_result);
    System.out.println(error_result);
} catch (InterruptedException | IOException e) {
	System.out.println("调用python脚本并读取结果时出错：" + e.getMessage());
}

<dependency>
    <groupId>org.python</groupId>
    <artifactId>jython-standalone</artifactId>
    <!--python版本在这里指定（2.x或3.x等）-->
    <version>3.7.0</version>	
</dependency>

import org.python.util.PythonInterpreter
public class JavaRunPython {
    public static void main(String[] args) {
    	//调用python的解释器
        PythonInterpreter interpreter = new PythonInterpreter();
        //执行Python语句
        interpreter.exec("str = 'hello world!'; ");
        interpreter.exec("print(str);");
    }
}

import org.python.util.PythonInterpreter;
public class JavaPythonFile {
    public static void main(String[] args) {
        PythonInterpreter interpreter = new PythonInterpreter();
        //我在这里使用相对路径，注意区分
        interpreter.execfile("D:/code/test.py");
    }
}

a = 1
b = 2
print(a +ｂ)

echo hello world!
D:
cd D:\code\
start python test.py
pause

try {
	StringBuilder sb = new StringBuilder();
	String batPath = "D:/hello.bat";
	Process process = Runtime.getRuntime().exec(batPath);
	InputStream in = process.getInputStream();
	BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(in));
	String line;
	while ((line = bufferedReader.readLine()) != null) {
		sb.append(line + "\n");
	}
	in.close();
	try {
		process.waitFor();
	} catch (InterruptedException e) {
		System.out.println(e);
	}
} catch (IOException e) {
	System.out.println(e);
}