pdf转base64字符串及base64字符串反转pdf

pdf转base64

//转base64
    public  String fileToBase64() {
//        String imgFilePath = "C:\\Users\\zlf\\Desktop\\pdf\\042002200211_87910810.pdf";
        String imgFilePath = "C:\\Users\\zlf\\Desktop\\pdf\\【高德打车-38.65元-1个行程】高德打车电子行程单.pdf";
        String[] res = imgFilePath.split("\\.");
        String pos = res[res.length - 1];
        byte[] data = null;
        // 读取图片字节数组
        try {
            InputStream in = new FileInputStream(imgFilePath);
            data = new byte[in.available()];
            in.read(data);
            in.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
        String data1 = Base64.encodeBase64String(data);
        System.out.println(data1);
        return data1;
    }

Base64转pdf

//转pdf
    @Test
    public void sfad(){
        String s = this.fileToBase64();
        byte[] decode = Base64.decodeBase64(s);
        File file = new File("d:/file2.pdf");//pdf保存路径
        try {
            FileOutputStream fop =  new FileOutputStream(file);
            try {
                fop.write(decode);
                fop.flush();
                fop.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }

    }

这里的Base64我用的commons-codec:1.15

可以用jdk1.8的base64，如下

public static void main(String[] args) throws UnsupportedEncodingException {
    String string = "12345";
    System.out.println("old string: " + string);
    String base64 = Base64.getEncoder().encodeToString(string.getBytes("UTF-8"));
    System.out.println("base64 decode: " + base64);

    byte[] bytes = Base64.getDecoder().decode(base64);
    System.out.println("base64 encode: " + new String(bytes, "UTF-8"));
}