如何通过Files.list()方法获取文本文件的行字符串数组（强制使用该方法）

Got it, let's break down how to fix this. The core issue with your current code is that Files.list(Paths.get("path")) returns a stream of Path objects representing every entry in the directory—not the content of your text file. That's why toArray() gives you an array of file paths instead of the lines from your target file.

Here's how to adjust your code while still adhering to the requirement of using Files.list:

Key Steps to Implement #

1. Filter the directory stream to locate your specific text file
2. Read all lines from the found file
3. Convert lines to a String array (type-safe instead of Object[])
4. Properly close the stream (using try-with-resources to avoid resource leaks)

Corrected Code #

// Assuming 'path' is a class-level String variable pointing to your directory
public String[] returnStrings(String targetTxtFile) {
    try (Stream<Path> directoryStream = Files.list(Paths.get(path))) {
        // Find the target text file in the directory stream
        Path targetFile = directoryStream
                .filter(p -> p.getFileName().toString().equals(targetTxtFile))
                .findFirst()
                .orElse(null);

        if (targetFile != null) {
            // Read all lines and convert to a String array
            List<String> fileLines = Files.readAllLines(targetFile);
            return fileLines.toArray(new String[0]);
        }
    } catch (IOException ex) {
        // Handle exceptions like missing directory, permission issues, or file read errors
        ex.printStackTrace();
    }
    // Return null if file not found or an error occurred
    return null;
}

Explanation of Key Parts #

• try (Stream<Path> ...): This try-with-resources statement ensures the directory stream is closed automatically, which is mandatory for Files.list to release underlying system resources.
• filter(...): Narrows down the stream to only the Path matching your target filename (replace targetTxtFile with your actual filename, e.g., "data.txt").
• findFirst(): Retrieves the first matching Path (assuming only one file with that name exists in the directory). If no match is found, it returns null.
• Files.readAllLines(targetFile): Reads all lines from the found file into a List<String>, which we then convert to a String array using toArray(new String[0]).

Usage Example #

To get lines from your text file, call the method like this:

String[] lines = returnStrings("your-file.txt");

内容的提问来源于stack exchange，提问作者miclelov