How Can I Decode Escaped Unicode Characters in Java File Names?

Unicode String Conversion: Decoding Escaped Unicode into Letters

Encoding string data using Unicode allows for the representation of a wider range of characters, including non-ASCII characters. However, for various reasons, it may be necessary to convert a string containing escaped Unicode characters (uXXXX) back to a string of regular Unicode letters.

In this scenario, you're encountering an issue where file names read from a file are escaped with Unicode encoding. This poses a challenge when searching for the files because the search criteria include the escaped characters, leading to unsuccessful matches.

To address this problem, one effective solution is to utilize the Apache Commons Lang StringEscapeUtils.unescapeJava() method. This method is designed to decode escaped Java strings and convert them into their unescaped equivalents.

The following code snippet demonstrates the usage of StringEscapeUtils.unescapeJava() to decode an escaped Unicode string:

import org.apache.commons.lang.StringEscapeUtils;

public class UnicodeStringConverter {
    public static void main(String[] args) {
        String sJava = "\u0048\u0065\u006C\u006C\u006F";

        // Decode the escaped Unicode string
        String unescapedString = StringEscapeUtils.unescapeJava(sJava);

        // Print the unescaped string
        System.out.println("Unescaped String: " + unescapedString);
    }
}

In this example, the escaped Unicode string is stored in the sJava variable. The StringEscapeUtils.unescapeJava() method is used to decode the string, resulting in an unescaped version that is stored in the unescapedString variable. Finally, the unescaped string is printed to the console.

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