base64编解码文件

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

import java.io.*;

/**
 * @Author:novy
 * @Date:12:05 2022/7/6
 * @Version 1.0
 **/
public class B64code {
    public static void main(String[] args) throws Exception {
        //解码还原成this.class
//        String str = "base64字符串";
//        decoderBase64File(str, "F:\\this.class");



        //编码到here.txt
        String base64Code =  encodeBase64File("F:\\this.class");
        String Str2 = base64Code.replaceAll("(\\r\\n|\\n|\\\\n|\\s)", "");
        System.out.println(Str2.trim());
        try (FileOutputStream fileOutputStream = new FileOutputStream("F:\\this.txt")) {
            byte[] bytes = Str2.getBytes();
            fileOutputStream.write(bytes);
        }
        }
    public static String encodeBase64File(String path) throws Exception {
        File file = new File(path);
        FileInputStream inputFile = new FileInputStream(file);
        byte[] buffer = new byte[(int)file.length()];
        inputFile.read(buffer);
        inputFile.close();
        return new BASE64Encoder().encode(buffer);
    }
    public static void decoderBase64File(String base64Code,String targetPath) throws Exception {
        byte[] buffer = new BASE64Decoder().decodeBuffer(base64Code);
        FileOutputStream out = new FileOutputStream(targetPath);
        out.write(buffer);
        out.close();
    }
    }