通过ProcessBuilder运行脚本后，在java中收集环境变量 [英] Collect environment variable in java after running script through ProcessBuilder

问题描述

为什么以下代码打印为false？我正在尝试test.sh脚本中的环境变量并在java中收集它。如果可能，请建议替代方法。

Why does the the following code print false ? I am trying to an environment variable in the test.sh script and collect it in java. Please suggest an alternative approach, if possible.

public static void main(String[] args){
ProcessBuilder processBuilder = new ProcessBuilder("test.sh");
Process process;
int exitCode;
try {
    process = processBuilder.start();
    exitCode = process.waitFor();
} catch (IOException e) {
        e.printStackTrace();            
    } catch (InterruptedException e) {
            // TODO Auto-generated catch block
        e.printStackTrace();            
    }
Map<String, String>envVars = processBuilder.environment();
System.out.println(envVars.keySet().contains("SOURCE"));
}

并且test.sh脚本的代码只是

And the code for test.sh script is simply

set SOURCE=source

推荐答案

ProcessBuilder.environment（）方法用于在调用时将初始环境传递给进程启动（）。您无法从父进程获取子进程的环境。这不是Java限制：您甚至无法从创建子进程的Bash shell脚本（或实际上任何东西）获取子进程环境。您需要找到另一种方法将信息从子流程传递回父流程。

The ProcessBuilder.environment() method is used for passing the initial environment to the process when you call start(). You cannot get the environment of a subprocess from a parent process. This is not a Java restriction: you can't even get a subprocess environment from a Bash shell script (or in fact anything) that creates a subprocess. You need to find another means of communicating information from the subprocess back to the parent process.

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