非法逃脱字符后跟空格 [英] llegal escape character followed by a space

问题描述

我正在编写一些代码来使用在终端中加载和运行文件的进程来运行shell脚本。我遇到的问题是由于空格而使终端识别文件名，例如：

I'm writing a bit of code to run a shell script using process that loads and runs a file in terminal. The problem I'm having is getting the filename to be recognised by terminal due to the spaces, for example :

"$ ./run_file.sh foo bar.ss" 

应该在终端中运行

"$ ./run_file.sh foo\ bar.ss"

继承代码改变它取代它：

Heres the code to change it replace it:

JPanel panel1 = new JPanel();
JButton button = new JButton("Run");
button.setAlignmentX( Component.CENTER_ALIGNMENT);

button.addActionListener(new ActionListener(){

    public void actionPerformed(ActionEvent event){

        run();

    }

});
//button.setAlignmentX(0.5);
panel1.add(button);
panel1.add(Box.createVerticalGlue());
panel1.add(button);

menuB = new JMenuBar();

JMenu dropD = new JMenu("File");
menuB.add(dropD);

JMenuItem loadR = new JMenuItem("Load file");
JMenuItem quit = new JMenuItem("Quit");
dropD.add(loadR);
dropD.add(quit);
loadR.addActionListener(new ActionListener(){
        public void actionPerformed(ActionEvent event) {
            JFileChooser fileopen = new JFileChooser();

            int r= fileopen.showDialog(panel, "Load file");

            if (r == JFileChooser.APPROVE_OPTION) {
                File file = fileopen.getSelectedFile();
                String string = file.toString();
                string = string.replaceAll(" ", "\ ");
                //String output = aa.replaceAll("/",Character.toString(File.separatorChar));
                System.out.println(string);
                loadFile = file;
        }

       }
  });

我已经尝试过使用String.replaceAll但是得到了

I have been tried using String.replaceAll but get

java:66: illegal escape character

i意识到我可以使用File.separatorChar：

i realise that I can use File.separatorChar :

string = string.replaceAll(" ", Character.toString(File.separatorChar)+" ");

但这似乎没有取代任何东西......
任何帮助都会很多赞赏。

but this doesn't seem to replace anything... Any help would be much appreciated.

谢谢

推荐答案

如果你想把<字符串中的code> \ 字符（转义字符），你需要转义它：

If you want to put the \ character (which is the escape character) inside a string, you'll need to escape it:

string = string.replaceAll (" ", "\\ ");

单个 \ 是一个转义序列前导字符，例如 \ n （换行符）或 \ r （回车）。单字符转义的完整列表是：

A single \ is a escape sequence leading character, such as with \n (newline) or \r (carriage return). The full list of single-character escapes is:

\b    backspace
\t    tab
\n    linefeed (newline)
\f    form feed
\r    carriage return
\"    double quote
\'    single quote
\\    backslash

这是八进制转义序列的补充，例如 \\ \\ 0 ， \\\ 或 \ 377 。

This is in addition to the octal escape sequences s such as \0, \12 or \377.

你的 separatorChar 解决方案不起作用的原因是因为它为你提供了分隔符 char（<$在UNIX及其兄弟下c $ c> / ，而不是您需要的转义字符 \ 。

The reason why your separatorChar solution won't work is because that gives you the separator char (/ under UNIX and its brethren), not the escape character \ that you need.

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