无法从Java程序运行UNIX命令 [英] Unable to run UNIX command from Java program

问题描述

我正在尝试创建一个java程序，它接受一些用户输入变量并将它们传递给perl脚本（它实际上在perl脚本中找到某个字符串并用用户输入变量替换它）。以下是代码：

I am trying to create a java program that takes some user-input variables and passes them to a perl script (it actually finds a certain string within the perl script and replaces it with the user-input variables). Here is the code:

    String sedMain = "sed -e ";
    String sedFirstLine = "'s/AAA/"+newFirstLine+"/' -e ";
    String sedNewCntr = "'s/BBB/"+newCntr+"/' -e ";
    String sedNewSpacing = "'s/SPACE/"+newSpacing+"/' -e ";
    String sedNewDmax = "'s/MAX/"+newDmax+"/'";
    String sedFile = " /filepath/myperlscript.pl >  /filepath/myNEWperlscript.pl";
    String sedCommand=sedMain+sedFirstLine+sedNewCntr+sedNewSpacing+sedNewDmax+sedFile;
    System.out.println("SED COMMAND: "+sedCommand);
    String testRun = "touch /filepath/hello.txt";
    Process runSedCommand;
    runSedCommand = Runtime.getRuntime().exec(sedCommand);

我正在使用IDE，当sed命令打印到控制台时，它看起来是正确的。我从控制台复制了sed命令并从终端运行它，它工作正常。我编写了字符串testRun以查看Java中的Process是否存在问题，并创建了文件hello.txt。出于某种原因，我的程序没有创建输出perl文件myNEWperlscript.pl。我很困惑为什么这不起作用。任何人都可以帮忙吗？

I am using an IDE, and when the sed command is printed to the console, it looks correct. I copied the sed command from the console and ran it from the terminal, and it worked. I wrote the string "testRun" to see if there was a problem with the Process in Java, and it created the file "hello.txt". For some reason though, my program is not creating the output perl file "myNEWperlscript.pl". I am very confused as to why this is not working. Can anyone help out?

推荐答案

exec（）接受带有程序名称和参数的String []，但是你将所有内容连接成一个String，从而有效地丢失了参数。

exec() takes a String[] with the program name and paramaters as its elements, but you are concatenating everything together into a single String and so effectively loosing the arguments.

尝试这样的事情：

String[] cmd = {"sed", "first argument", "second argument"};
Runtime.getRuntime().exec(cmd);

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