java 文件编码转换工具类

public class ConvertFileFormatUtils {

    public static void main(String[] args) throws Exception {
        
        ConvertFileFormat(new File("C:\Users\gouwenyong0000\Desktop\github\java-EE\0.javaSE\code\基础day01-day05：EditPlus\day05\PrimeNumberTest2.java"),
                "d:\123.java",
                "GB2312", 
                StandardCharsets.UTF_8);

    }

    
    private static void ConvertFileFormat(File file, String gb2312, String destFile, Charset utf8) throws IOException {


        InputStream fis = new FileInputStream(file);
        InputStreamReader isr = new InputStreamReader(fis, gb2312);

        FileOutputStream fos = new FileOutputStream(destFile);
        OutputStreamWriter osw = new OutputStreamWriter(fos, utf8);

        char[] buffer = new char[1024];

        int n;
        while ((n = isr.read(buffer)) != -1) {
            System.out.println(buffer);
            osw.write(buffer, 0, n);
        }

        osw.close();
        isr.close();
    }
}