如何將文件經過base64字符加密以及解碼保存到目標文件

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

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;

/**
 * Created by Administrator on 2017/10/28 0028.
 */
public class FileUtil {
    public static final String DEPATH = "D:/test/deFile/test.jsp";
    public static final String ENPATH = "D:/test/enFile/test.jsp";
    public static final String PATH = "D:/test/File/test.jsp";
    /**
     * 將文件轉成base64字符串
     * @param  path   文件路徑
     * @return  String
     * @throws Exception
     * */
    public static  String encodeBase64File(String path)throws Exception{
        File file = new File(path);
        FileInputStream fileInputStream = new FileInputStream(file);
        byte[] buffer  = new byte[(int)file.length()];
        //是否read讀入的數據交給buffer
        fileInputStream.read(buffer);
        fileInputStream.close();
        return new BASE64Encoder().encode(buffer);
    }
    /**
     * 將文件base64字符解碼並保存到目標文件
     * @param  base64Code   字符串  targetPath 目標文件
     * @return  void
     * @throws Exception
     * */
    public static  void decoderBase64File(String base64Code,String targetPath)throws Exception{
        byte[] buffer  = new BASE64Decoder().decodeBuffer(base64Code);
        FileOutputStream fileOutputStream = new FileOutputStream(targetPath);
        fileOutputStream.write(buffer);
        fileOutputStream.close();
    }
    /**
     * 將文件base64字符保存文件
     * @param  base64Code   字符串   targetPath 目標文件
     * @return  void
     * @throws Exception
     * */
    public static  void base64ToFile(String base64Code,String targetPath)throws Exception{
        byte[] buffer  = base64Code.getBytes();
        FileOutputStream fileOutputStream = new FileOutputStream(targetPath);
        fileOutputStream.write(buffer);
        fileOutputStream.close();
    }
    public static void main(String[] agrs){
        try {
            String base64Code = encodeBase64File(ENPATH);
            System.out.println(base64Code);
            decoderBase64File(base64Code,DEPATH);
            base64ToFile(base64Code,PATH);
        }catch (Exception e){
            e.printStackTrace();
        }
    }
}
注：僅供分享，內容參照其餘學者