我可以在 Windows 上做什么来阻止它重新标记我的命令行参数？

它在 Linux 和 OS X 上工作得很好。

代码如下:

import java.lang.*;
import java.io.*;
import java.util.*;
public class test {
    public static void main (String[] args) throws IOException, InterruptedException {
        if (args.length == 0) {
            ArrayList<String> childargs = new ArrayList<String>();
            childargs.add("java");
            childargs.add("test");
            childargs.add("--p='sprintf(\"%8d %13s\")'");
            for (String s : childargs)
                System.out.println(String.format("Parent: arg=<%s>", s));
            ProcessBuilder pb = new ProcessBuilder(childargs);
            pb.inheritIO();
            Process p = pb.start();
            int rc = p.waitFor();
            System.out.println("Parent: child rc=" + rc);
        } else {
            for (int i=0; i<args.length; i++)
                System.out.println(String.format("Child:  arg=<%s>", args[i]));
            System.exit(3);
        }
    }
}

在 Linux 和 OS X 上，这是它打印的内容。

$ java test
Parent: arg=<java>
Parent: arg=<test>
Parent: arg=<--p='sprintf("%8d %13s")'>
Child:  arg=<--p='sprintf("%8d %13s")'>
Parent: child rc=3

在 Windows 7 Professional 上打印这个

> java test
Parent: arg=<java>
Parent: arg=<test>
Parent: arg=<--p='sprintf("%8d %13s")'>
Child:  arg=<--p='sprintf(%8d>
Child:  arg=<%13s)'>
Parent: child rc=3

我想要的是让 child 的命令行参数与 parent 给它的命令行参数相同。我不希望将论点分解成多个部分。而且我宁愿不必编写依赖于平台的代码。

最佳答案

反斜杠有效。来自 CommandLineToArgvW 的描述:

CommandLineToArgvW has a special interpretation of backslash characters when they are followed by a quotation mark character ("), as follows:

• 2n backslashes followed by a quotation mark produce n backslashes followed by a quotation mark.
• (2n) + 1 backslashes followed by a quotation mark again produce n backslashes followed by a quotation mark.
• n backslashes not followed by a quotation mark simply produce n backslashes.

Net 是使用反斜杠保留参数中的双引号。因此，一个更简单的解决方案是在 Windows 上有条件地反斜杠双引号:

import java.lang.*;
import java.io.*;
import java.util.*;
public class test {
    public static void main (String[] args) throws IOException, InterruptedException {
        if (args.length == 0) {
            ArrayList<String> childargs = new ArrayList<String>();
            childargs.add("java");
            childargs.add("test");
            String quotedArg = "--p='sprintf(\"%8d %13s\")'";
            //
            // HERE'S THE KEY CODE FRAGMENT
            //
            if (isWin()) {
                quotedArg = quotedArg.replace("\"", "\\\"");
            }
            childargs.add(quotedArg);
            for (String s : childargs)
                System.out.println(String.format("Parent: arg=<%s>", s));
            ProcessBuilder pb = new ProcessBuilder(childargs);
            pb.inheritIO();
            Process p = pb.start();
            int rc = p.waitFor();
            System.out.println("Parent: child rc=" + rc);
        } else {
            for (int i=0; i<args.length; i++)
                System.out.println(String.format("Child:  arg=<%s>", args[i]));
            System.exit(3);
        }
    }

    static boolean isWin() {
        return System.getProperty("os.name").toLowerCase().indexOf("win") >= 0;
    }
}

这会在 *nix 上产生以下输出:

Parent: arg=<java>
Parent: arg=<test>
Parent: arg=<--p='sprintf("%8d %13s")'>
Child:  arg=<--p='sprintf("%8d %13s")'>
Parent: child rc=3

在 Windows 上:

Parent: arg=<java>
Parent: arg=<test>
Parent: arg=<--p='sprintf(\"%8d %13s\")'>
Child:  arg=<--p='sprintf("%8d %13s")'>
Parent: child rc=3

关于java - ProcessBuilder 对我在 Windows 上的命令行参数做了一些事情，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/34402429/