从Java程序中运行bash命令 [英] Running a bash command from within a Java program

问题描述

考虑一段Java代码:

Consider a piece of Java code:

import java.io.IOException;
public class Demo{
          public static void main(String []args) throws IOException{
                   ...
                   String abc="i am here";
                   System.out.println(abc);
 }

}

我想运行-回显文件的文件名" >> file1.txt-假设file1.txt在同一目录中，紧接在System.out.println()行之后.

I want to run - echo "THIS IS STUFF FOR THE FILE" >> file1.txt - immediately after the System.out.println() line, assuming file1.txt is in the same directory.

推荐答案

ProcessBuilder 类是更现代的版本.

import static java.lang.ProcessBuilder.Redirect.appendTo;

ProcessBuilder pb = new ProcessBuilder("/bin/echo", "THIS IS STUFF FOR THE FILE");
pb.redirectOutput(appendTo(new File("file1.txt")));
Process p = pb.start();

请注意，这将直接调用/bin/echo ，而不是让 bash 浏览 PATH .这样比较安全，因为没有机会遭到黑客入侵 echo .另外，由于它不使用 bash ，因此Java用于重定向输出.

Notice that this calls /bin/echo directly instead of having bash look through the PATH. That's safer, as there is no chance of getting a hacked echo. Also, since this doesn't use bash, Java is used to redirect the output.

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