如何使用java将ucs2编码文件转换为UTF-8或UTF-16或ANSI编码格式

import java.io.*;

public class UCS2ToUTF8Converter {
    public static void main(String[] args) {
        String ucs2FilePath = "path/to/ucs2/file.txt";
        String utf8FilePath = "path/to/utf8/file.txt";
        String utf16FilePath = "path/to/utf16/file.txt";
        String ansiFilePath = "path/to/ansi/file.txt";

        try {
            // 读取UCS2编码文件
            FileInputStream fis = new FileInputStream(ucs2FilePath);
            InputStreamReader isr = new InputStreamReader(fis, "UTF-16");
            BufferedReader br = new BufferedReader(isr);

            // 写入UTF-8编码文件
            FileOutputStream fosUtf8 = new FileOutputStream(utf8FilePath);
            OutputStreamWriter oswUtf8 = new OutputStreamWriter(fosUtf8, "UTF-8");
            BufferedWriter bwUtf8 = new BufferedWriter(oswUtf8);

            // 写入UTF-16编码文件
            FileOutputStream fosUtf16 = new FileOutputStream(utf16FilePath);
            OutputStreamWriter oswUtf16 = new OutputStreamWriter(fosUtf16, "UTF-16");
            BufferedWriter bwUtf16 = new BufferedWriter(oswUtf16);

            // 写入ANSI编码文件
            FileOutputStream fosAnsi = new FileOutputStream(ansiFilePath);
            OutputStreamWriter oswAnsi = new OutputStreamWriter(fosAnsi, "Cp1252");
            BufferedWriter bwAnsi = new BufferedWriter(oswAnsi);

            String line;
            while ((line = br.readLine()) != null) {
                // 将UCS2编码的字符串转换为Java内部的Unicode编码
                String unicodeString = new String(line.getBytes("UTF-16"), "UTF-16");

                // 写入UTF-8编码文件
                bwUtf8.write(unicodeString);
                bwUtf8.newLine();

                // 写入UTF-16编码文件
                bwUtf16.write(unicodeString);
                bwUtf16.newLine();

                // 写入ANSI编码文件
                bwAnsi.write(unicodeString);
                bwAnsi.newLine();
            }

            br.close();
            bwUtf8.close();
            bwUtf16.close();
            bwAnsi.close();

            System.out.println("转换完成！");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}