Question

我试图在for循环中的nodejs中执行与java进程相同的java jar文件，但是如何监听多个子输出???

test.jar文件在无限循环中运行，它所做的就是递增并打印数字。

下面是我的代码，它确实在nodejs中产生了多个子进程，但它只打印了最后一个子进程的pid，而其他子进程的内容都被添加到最后一个子进程中。

var exec = require('child_process').exec, child;
var state = "java -jar " + "c://test.jar "
var exec = require('child_process').exec;

for (var i = 0; i < 10; i++) {

    var child = exec(state);

    // Add the child process to the list for tracking
    p_list.push({process:child, content:""});

    // Listen for any response:
    child.stdout.on('data', function (data) {
        console.log(child.pid, data);
        p_list[i].content += data;
    });

    // Listen for any errors:
    child.stderr.on('data', function (data) {
        console.log(child.pid, data);
        p_list[i].content += data;
    }); 

    // Listen if the process closed
    child.on('close', function(exit_code) {
        console.log('Closed before stop: Closing code: ', exit_code);
    });
}

Answer 1

在处理异步进程时，您需要关闭i。

for (var i = 0; i < 10; i++) {
    (function(i){
        var child = exec(state);

        // Add the child process to the list for tracking
        p_list.push({process:child, content:""});

        // Listen for any response:
        child.stdout.on('data', function (data) {

            console.log(child.pid, data);
            p_list[i].content += data;
        });

        // Listen for any errors:
        child.stderr.on('data', function (data) {
            console.log(child.pid, data);
            p_list[i].content += data;
        }); 

        // Listen if the process closed
        child.on('close', function(exit_code) {
            console.log('Closed before stop: Closing code: ', exit_code);
        });
    })(i)
}

Answer 2

您可以尝试查看Node {JS的Cluster API。基本上它允许你有一个主流程来旋转工人，然后每个工人都是它自己的流程。我认为你需要的是什么？

如何在nodejs中监听和生成多个子进程

2 个答案: