java 读取文件的字节数组

  /*文件64位编码*/

  public static void main(String[] args) {
   byte[] fileByte = toByteArray(newFile);
   String imgStr = new BASE64Encoder().encode(fileByte);
  }

/*读取文件的字节数组*/
public static byte[] toByteArray(File file) throws IOException {  
        File f = file;  
        if (!f.exists()) {  
            throw new FileNotFoundException("file not exists");  
        }  
        ByteArrayOutputStream bos = new ByteArrayOutputStream((int) f.length());  
        BufferedInputStream in = null;  
        try {  
            in = new BufferedInputStream(new FileInputStream(f));  
            int buf_size = 1024;  
            byte[] buffer = new byte[buf_size];  
            int len = 0;  
            while (-1 != (len = in.read(buffer, 0, buf_size))) {  
                bos.write(buffer, 0, len);  
            }  
            return bos.toByteArray();  
        } catch (IOException e) {  
            e.printStackTrace();  
            throw e;  
        } finally {  
            try {  
                in.close();  
            } catch (IOException e) {  
                e.printStackTrace();  
            }  
            bos.close();  
        }  
    }