java 文件读写 BASE64解密、加密

public class FileUtil {

 public static File saveFile(String fileContent, String filePath)
   throws IOException {
  if (fileContent == null) {
   return null;
  }
  BASE64Decoder decoder = new BASE64Decoder();

  byte[] picBinary = decoder.decodeBuffer(fileContent);
  File file = new File(filePath);
  FileOutputStream out = new FileOutputStream(file);
  out.write(picBinary);
  out.close();
  return file;

 }

 public static String readFile(String filePath) {

  try {
   BASE64Encoder encoder = new BASE64Encoder();
   File file = new File(filePath);
   FileInputStream in = new FileInputStream(file);
   byte[] b = new byte[(int) file.length()];
   in.read(b);
   String result =encoder.encode(b);
   in.close();

   return result;

  } catch (Exception e) {
   
   e.printStackTrace();
  }
  return null;
 }

 
 public static void deleteFile(String fileName) {
  File file = new File(fileName);
  if (file.exists() && file.isFile()) {
   file.delete();
  }
 }

}