javascript 如何从 node.js 调用 java 程序？
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How to call a java program from node.js?
提问by sneaky
I have a node.js script and a java program in the same folder (.class and .java and .js). I want to call the java program from the node.js script. In terminal I can call the java program like this
我在同一个文件夹（.class 和 .java 和 .js）中有一个 node.js 脚本和一个 java 程序。我想从 node.js 脚本中调用 java 程序。在终端我可以像这样调用java程序
java -cp java-json.jar:. PlutoMake "tests/android.png"
java -cp java-json.jar:. PlutoMake "tests/android.png"
I saw this thread How to call Java program from NodeJs
我看到了这个线程How to call Java program from NodeJs
and I am trying to do the same thing, here is the node.js code
我正在尝试做同样的事情，这是 node.js 代码
var child = spawn('java', ['-cp java-json.jar:. PlutoMake', 'tests/android.png']);
This seems to run without crashing, but then nothing happens. The java program creates an image, but if I do it through node, it doesn't work. Does anyone know whats wrong?
这似乎运行没有崩溃，但随后什么也没有发生。java程序创建了一个图像，但是如果我通过node来做，它就不起作用了。有谁知道出了什么问题？
Thanks
谢谢
回答by Ry-
The array of arguments you pass should have one element per argument. You're incorrectly combining a few of them.
您传递的参数数组每个参数应该有一个元素。您错误地组合了其中的一些。
var child = spawn('java', ['-cp', 'java-json.jar:.', 'PlutoMake', 'tests/android.png']);
Checking the output and exit code could prove useful:
检查输出和退出代码可能很有用：
child.on('close', function (exitCode) {
if (exitCode !== 0) {
console.error('Something went wrong!');
}
});
// If you're really just passing it through, though, pass {stdio: 'inherit'}
// to child_process.spawn instead.
child.stderr.on('data', function (data) {
process.stderr.write(data);
});
