Java InputStream转Python(PY4J) [英] Java InputStream to Python (PY4J)

问题描述

我正在使用PY4J在python中运行Java代码( http://py4j.sourceforge.net/ ).

I'm running Java code in python using PY4J (http://py4j.sourceforge.net/).

我的java函数返回一个InputStream，我想在我的python代码中对其进行操作:

My java function returns an InputStream and I would like to manipulate it in my python code:

Java代码:

public InputStream getPCAP(key) {
        InputStream inputStream = cyberStore.getPCAP(pcapStringKey);
        return inputStream;
}

Python代码:

from py4j.java_gateway import JavaGateway

gateway = JavaGateway()
input_stream = PY4J_GateWay.getPCAP(key); 
...

如何在python中获取InputStream?

How can I get the InputStream in python?

在将其返回给python之前，我应该将其转换为Java代码中的其他内容吗?

Should I convert it to something else in the java code before returning it to python?

推荐答案

我猜您想从输入流中读取内容.

I'm guessing you want to read from the input stream.

Java的API使您可以从InputStream读取到byte数组.没有通过引用传递Pythonic bytearray的简单方法，但是您可以轻松地添加从InputStream读取并返回byte数组的方法:

Java's API lets you read from an InputStream into a byte array. There is no simple way to pass a Pythonic bytearray by reference, yet you can easily add a method which reads from an InputStream and returns a byte array:

public byte[] read(InputStream stream, int count) throws IOException {
    byte[] bytes = new byte[count];
    stream.read(bytes);
    return bytes;
}

然后，在Python中，您可以调用此方法以读取InputStream:

Then, in Python you can call this method to read from the InputStream:

gateway = JavaGateway()
input_stream = gateway.getPCAP(key)
data = gateway.read(input_stream, 1000) # reads 1000 bytes from input_stream

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