如何将*.txt文件转换为Unicode

with open("input.txt", "r", encoding="utf-8") as file:
    content = file.read()
    unicode_content = content.encode("unicode_escape").decode("utf-8")
    with open("output.txt", "w", encoding="utf-8") as output_file:
        output_file.write(unicode_content)

import java.io.File;
import java.io.FileWriter;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;

public class TxtToUnicode {
    public static void main(String[] args) {
        try {
            BufferedReader reader = new BufferedReader(new FileReader("input.txt"));
            String line = reader.readLine();
            StringBuilder stringBuilder = new StringBuilder();
            while (line != null) {
                stringBuilder.append(line);
                stringBuilder.append("\n");
                line = reader.readLine();
            }
            reader.close();
            String content = stringBuilder.toString();
            String unicodeContent = content.replaceAll(".", "\\\\u$0");
            FileWriter writer = new FileWriter("output.txt");
            writer.write(unicodeContent);
            writer.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}