java - 将目录设置为文件中的路径

Question

我只想将目录设置为我之前写在文件中的路径。

因此我使用了：

fileChooser.setCurrentDirectory(new File("path.txt"));

在 path.txt 中给出了路径。但不幸的是，这行不通，我想知道为什么：P。我想我完全错了setCurrentDic..

Answer 1

setCurrentDirectory takes a file representing a directory as parameter. Not a text file where a path is written.

To do what you want, you have to read the file "path.txt", create a File object with the contents that you just read, and pass this file to setCurrentDirectory :

String pathWrittenInTextFile = readFileAsString(new File("path.txt"));
File theDirectory = new File(pathWrittenInTextFile);
fileChooser.setCurrentDirectory(theDirectory);

Answer 2

You have to read the contents of path.txt. Thea easiest way is through commons-io:

String fileContents = IOUtils.toString(new FileInputStream("path.txt"));
File dir = new File(fileContents);

You can also use FileUtils.readFileToString(..)

Answer 3

JFileChooser chooser = new JFileChooser();

try {
    // Create a File object containing the canonical path of the
    // desired directory
    File f = new File(new File(".").getCanonicalPath());

    // Set the current directory
    chooser.setCurrentDirectory(f);
} catch (IOException e) {
}